Provided by: blt-dev_2.5.3+dfsg-4_amd64 bug

NAME

       stripchart -  2D strip chart for plotting x and y coordinate data.

SYNOPSIS

       stripchart pathName ?option value?...
_________________________________________________________________

DESCRIPTION

       The  stripchart  command  creates  a  strip  chart  for plotting two-dimensional data (x,y
       coordinates). It has many configurable components: coordinate axes, elements, legend, grid
       lines,  cross  hairs,  etc.   They  allow  you to customize the look and feel of the strip
       chart.

       The stripchart is essentially the same as the graph widget.  It works almost  exactly  the
       very same way.

       The use of a strip chart differs in that the X-axis typically refers to time points.  Data
       values are added at intervals.  The strip chart lets you automatically maintain a view  of
       the  most recent time points.  The axis options -shiftby and -autorange control this.  You
       can specify different line styles for data points (see the -styles option).

INTRODUCTION

       The stripchart command creates  a  new  window  for  plotting  two-dimensional  data  (x,y
       coordinates).  Data points are plotted in a box displayed in the center of the new window.
       This is the plotting area.  The coordinate axes are displayed in the  margins  around  the
       plotting  area.   By  default,  the legend is displayed in the right margin.  The title is
       displayed in top margin.

       A strip chart is composed of several components: coordinate axes, data  elements,  legend,
       grid, cross hairs, pens, postscript, and annotation markers.

       axis      The  stripchart  widget can display up to four coordinate axes (two X-coordinate
                 and two Y-coordinate axes), but you can create and use any number of axes.  Axes
                 control  what  region of data is displayed and how the data is scaled. Each axis
                 consists of the axis line, title, major and minor ticks, and tick  labels.  Tick
                 labels display the value of each major tick.

       crosshairs
                 Cross  hairs  are  used  to finely position the mouse pointer in relation to the
                 coordinate axes. Two perpendicular lines are drawn  across  the  plotting  area,
                 intersecting at the current location of the mouse pointer.

       element   An  element  represents  a  set  of  data points. Elements can be plotted with a
                 symbol at each data point and lines connecting the points.   The  appearance  of
                 the element, such as its symbol, line width, and color is configurable.

       grid      Extends  the  major  and  minor  ticks  of  the  X-axis and/or Y-axis across the
                 plotting area.

       legend    The legend displays the name and symbol of each data element.  The legend can be
                 drawn in any margin or in the plotting area.

       marker    Markers  are  used  annotate  or  highlight areas of the graph. For example, you
                 could use a polygon marker to fill an area under a curve, or a  text  marker  to
                 label  a  particular  data  point.  Markers come in various forms: text strings,
                 bitmaps, connected line segments, images, polygons, or embedded widgets.

       pen       Pens define attributes (both symbol and line style) for elements.  Data elements
                 use  pens to specify how they should be drawn.  A data element may use many pens
                 at once.  Here, the particular pen used for a data point is determined from each
                 element's weight vector (see the element's -weight and -style options).

       postscript
                 The  widget  can  generate  encapsulated  PostScript  output. This component has
                 several options to configure how the PostScript is generated.

SYNTAX

       stripchart pathName ?option  value?...   The  stripchart  command  creates  a  new  window
       pathName  and  makes  it  into  a stripchart widget.  At the time this command is invoked,
       there must  not  exist  a  window  named  pathName,  but  pathName's  parent  must  exist.
       Additional  options  may may be specified on the command line or in the option database to
       configure aspects of the strip chart such as its  colors  and  font.   See  the  configure
       operation below for the exact details as to what option and value pairs are valid.

       If  successful, stripchart returns the path name of the widget.  It also creates a new Tcl
       command by the same name.  You can use this command to  perform  various  operations  that
       query  or  modify  the  graph.   The  general  form  is: pathName operation ?arg?...  Both
       operation and its arguments determine the exact behavior of the command.   The  operations
       available for the strip chart are described in the STRIPCHART OPERATIONS section.

       The  command can also be used to access components of the strip chart.  pathName component
       operation ?arg?...  The operation, now located after the name of  the  component,  is  the
       function  to  be performed on that component. Each component has its own set of operations
       that manipulate that component.  They will be described below in their own sections.

EXAMPLE

       The stripchart command creates a new strip chart.

              # Create a new strip chart.  Plotting area is black.
              stripchart .s -plotbackground black

       A new Tcl command .s is also created.  This command can be used to query  and  modify  the
       strip  chart.   For  example, to change the title of the strip chart to "My Plot", you use
       the new command and the widget's configure operation.

              # Change the title.
              .s configure -title "My Plot"

       A strip chart has several components.  To  access  a  particular  component  you  use  the
       component's  name.  For  example,  to  add  data elements, you use the new command and the
       element component.

              # Create a new element named "line1"
              .s element create line1 \
                -xdata { 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 } \
                -ydata { 26.18 50.46 72.85 93.31 111.86 128.47 143.14
                   155.85 166.60 175.38 }

       The element's X and Y coordinates are specified using lists of numbers.  Alternately,  BLT
       vectors could be used to hold the X-Y coordinates.

              # Create two vectors and add them to the strip chart.
              vector xVec yVec
              xVec set { 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 }
              yVec set { 26.18 50.46 72.85 93.31 111.86 128.47 143.14 155.85
                166.60 175.38 }
              .s element create line1 -xdata xVec -ydata yVec

       The  advantage  of  using  vectors is that when you modify one, the graph is automatically
       redrawn to display the new values.

              # Change the X-Y coordinates of the first point.
              set xVec(0) 0.18
              set yVec(0) 25.18

       An element named line1 is now created in .s.  By  default,  the  element's  label  in  the
       legend  will  be  also line1.  You can change the label, or specify no legend entry, again
       using the element's configure operation.

              # Don't display "line1" in the legend.
              .s element configure line1 -label ""

       You can configure more than just the element's label.  An element has many attributes such
       as symbol type and size, dashed or solid lines, colors, line width, etc.

              .s element configure line1 -symbol square -color red \
                -dashes { 2 4 2 } -linewidth 2 -pixels 2c

       Four  coordinate  axes  are  automatically  created:  x,  x2,  y, and y2.  And by default,
       elements are mapped onto the axes x and y.  This can be changed with the -mapx  and  -mapy
       options.

              # Map "line1" on the alternate Y-axis "y2".
              .s element configure line1 -mapy y2

       Axes  can be configured in many ways too.  For example, you change the scale of the Y-axis
       from linear to log using the axis operation.

              # Y-axis is log scale.
              .s axis configure y -logscale yes

       Axis limits are reset by simply specifying  new  axis  limits  using  the  -min  and  -max
       configuration options.

              .s axis configure x -min 1.0 -max 1.5
              .s axis configure y -min 12.0 -max 55.15

       By  default, the limits of the axis are determined from data values.  To reset back to the
       default limits, set the -min and -max options to the empty value.

              # Reset the axes to autoscale again.
              .s axis configure x -min {} -max {}
              .s axis configure y -min {} -max {}

       It's common with strip charts to automatically maintain a view of  the  most  recent  time
       points.  You can do this my setting the -autorange option.

              .s axis configure x -autorange 20.0

       If  the  time points are added in X-coordinates 1.0 unit, only the last twenty time points
       will be displayed.  As more data is added, the view will march along.

       Sometimes the rate of data is so high that changing the axis limits with  each  additional
       time  point  is  prohibitive.   You  can use the -shiftby option to define an increment to
       shift the view when needed.

              .s axis configure x -shiftby 15.0

       When the view is shifted, it will allow a range of 15 new time points to  be  added  until
       the axis limits are recomputed.

       By default, the legend is displayed in the right margin.  You can change this or any other
       legend configuration options using the legend component.

              # Configure the legend font, color, and relief
              .s legend configure -position left -relief raised \
                -font fixed -fg blue

       To prevent the legend from being displayed, turn on the -hide option.

              # Don't display the legend.
              .s legend configure -hide yes

       The stripchart widget has simple drawing procedures called markers.  They can be  used  to
       highlight or annotate data in the strip chart. The types of markers available are bitmaps,
       images, polygons, lines, or windows.  Markers can be used, for example, to mark  or  brush
       points.   Here  is  a  text marker which labels the data first point.  Markers are created
       using the marker operation.

              # Create a label for the first data point of "line1".
              .s marker create text -name first_marker -coords { 0.2 26.18 } \
                -text "start" -anchor se -xoffset -10 -yoffset -10

       This creates a text marker named first_marker.  It will display the text "start" near  the
       coordinates of the first data point.  The -anchor, -xoffset, and -yoffset options are used
       to display the marker above and to the left of the data point, so  that  the  actual  data
       point  isn't  covered  by the marker.  By default, markers are drawn last, on top of data.
       You can change this with the -under option.

              # Draw the label before elements are drawn.
              .s marker configure first_marker -under yes

       You can add cross hairs or grid lines using the crosshairs and grid operations.

              # Display both cross hairs and grid lines.
              .s crosshairs configure -hide no -color red
              .s grid configure -hide no -dashes { 2 2 }

       Finally, to get hardcopy of the strip chart, use the postscript operation.

              # Print the strip chart into file "file.ps"
              .s postscript output file.ps -maxpect yes -decorations no

       This generates a file file.ps containing the encapsulated PostScript of the  strip  chart.
       The  option  -maxpect  says  to  scale  the plot to the size of the page.  Turning off the
       -decorations option indicates that no borders or color  backgrounds  should  be  displayed
       (i.e. the background of the margins, legend, and plotting area will be white).

STRIPCHART OPERATIONS

       pathName axis operation ?arg?...
              See the AXIS COMPONENTS section.

       pathName bar elemName ?option value?...
              Creates  a  new  barchart  element  elemName.  It's an error if an element elemName
              already exists.  See the manual for barchart for  details  about  what  option  and
              value pairs are valid.

       pathName cget option
              Returns  the  current value of the stripchart configuration option given by option.
              Option may be any option described below for the configure operation.

       pathName configure ?option value?...
              Queries or modifies the configuration options of the strip chart.  If option  isn't
              specified,  a  list describing all of the current options for pathName is returned.
              If option is specified, but not value, then a list describing option  is  returned.
              If  one  or  more  option  and  value  pairs are specified, then for each pair, the
              stripchart option option is set to value.  The following options are valid for  the
              stripchart.

              -background color
                     Sets the background color. This includes the margins and legend, but not the
                     plotting area.

              -borderwidth pixels
                     Sets the width of the 3-D border around the outside edge of the widget.  The
                     -relief option determines if the border is to be drawn.  The default is 2.

              -bottommargin pixels
                     Specifies  the size of the margin below the X-coordinate axis.  If pixels is
                     0, the size of the margin is selected automatically.  The default is 0.

              -bufferelements boolean
                     Indicates whether to draw elements into a pixmap before displaying  them  on
                     the  screen.   The  advantage of buffering elements is when markers are used
                     heavily.  Markers can be moved and redrawn without requiring  every  element
                     to  be  redrawn again.  The disadvantage is that it takes slightly longer to
                     draw the graph. If boolean is true, data elements are drawn to  an  internal
                     pixmap.   The option should be turned off if the plot is updated frequently.
                     See the SPEED TIPS section.  The default is 1.

              -buffergraph boolean
                     Indicates whether to draw the graph into a  pixmap  first.   If  boolean  is
                     true,  the  entire  graph  is  drawn  into a pixmap and then copied onto the
                     screen.  This reduces flashing.  If false, the graph is drawn directly  into
                     the window.  Especially under Windows, turning off the option can be helpful
                     when the stripchart is updated frequently.  Turning  off  this  option  also
                     turns -bufferelements off. See the SPEED TIPS section.  The default is 1.

              -cursor cursor
                     Specifies the widget's cursor.  The default cursor is crosshair.

              -font fontName
                     Specifies    the    title   font.   The   default   is   *-Helvetica-Bold-R-
                     Normal-*-18-180-*.

              -halo pixels
                     Specifies a maximum distance to consider when searching for the closest data
                     point (see the element's closest operation below).  Data points further than
                     pixels away are ignored.  The default is 0.5i.

              -height pixels
                     Specifies the requested height of widget.  The default is 4i.

              -invertxy boolean
                     Indicates whether the placement X-axis and Y-axis should  be  inverted.   If
                     boolean is true, the X and Y axes are swapped.  The default is 0.

              -justify justify
                     Specifies  how  the  title  should be justified.  This matters only when the
                     title contains more than one line of text. Justify must be left,  right,  or
                     center.  The default is center.

              -leftmargin pixels
                     Sets  the  size  of  the  margin  from  the  left  edge of the window to the
                     Y-coordinate axis.  If pixels is 0, the size  is  calculated  automatically.
                     The default is 0.

              -plotbackground color
                     Specifies the background color of the plotting area.  The default is white.

              -plotborderwidth pixels
                     Sets  the width of the 3-D border around the plotting area.  The -plotrelief
                     option determines if a border is drawn.  The default is 2.

              -plotpadx pad
                     Sets the amount of padding to be added to the left and right  sides  of  the
                     plotting  area.   Pad  can be a list of one or two screen distances.  If pad
                     has two elements, the left side of the plotting area entry is padded by  the
                     first  distance  and  the  right  side  by  the  second.  If pad is just one
                     distance, both the left and right sides are padded evenly.  The  default  is
                     8.

              -plotpady pad
                     Sets the amount of padding to be added to the top and bottom of the plotting
                     area.  Pad can be a list of one or two screen distances.   If  pad  has  two
                     elements,  the  top of the plotting area is padded by the first distance and
                     the bottom by the second.  If pad is just one distance,  both  the  top  and
                     bottom are padded evenly.  The default is 8.

              -plotrelief relief
                     Specifies  the  3-D  effect for the plotting area.  Relief indicates how the
                     interior of the plotting area should appear relative to rest  of  the  strip
                     chart; for example, raised means the plot should appear to protrude from the
                     strip chart, relative to the surface of the strip  chart.   The  default  is
                     sunken.

              -relief relief
                     Specifies  the  3-D  effect  for the widget.  Relief indicates how the strip
                     chart should appear relative to widget  it  is  packed  into;  for  example,
                     raised  means  the  strip  chart  should appear to protrude.  The default is
                     flat.

              -rightmargin pixels
                     Sets the size of margin from the plotting area to  the  right  edge  of  the
                     window.   By  default, the legend is displayed in this margin.  If pixels is
                     than 1, the margin size is selected automatically.

              -takefocus focus
                     Provides information used when moving the focus from window  to  window  via
                     keyboard  traversal  (e.g.,  Tab  and Shift-Tab).  If focus is 0, this means
                     that this window should be skipped entirely during  keyboard  traversal.   1
                     means  that the this window should always receive the input focus.  An empty
                     value means that the traversal scripts make the decision whether to focus on
                     the window.  The default is "".

              -tile image
                     Specifies  a  tiled  background.  If image isn't "", the background is tiled
                     using image.  Otherwise, the normal  background  color  is  drawn  (see  the
                     -background  option).   Image  must  be  an image created using the Tk image
                     command.  The default is "".

              -title text
                     Sets the title to text. If text is "", no title will be displayed.

              -topmargin pixels
                     Specifies the size of the margin above the x2 axis.  If  pixels  is  0,  the
                     margin size is calculated automatically.

              -width pixels
                     Specifies the requested width of the widget.  The default is 5i.

       pathName crosshairs operation ?arg?
              See the CROSSHAIRS COMPONENT section.

       pathName element operation ?arg?...
              See the ELEMENT COMPONENTS section.

       pathName extents item
              Returns  the  size  of  a  particular item in the strip chart.  Item must be either
              leftmargin, rightmargin, topmargin, bottommargin, plotwidth, or plotheight.

       pathName grid operation ?arg?...
              See the GRID COMPONENT section.

       pathName invtransform winX winY
              Performs an inverse coordinate transformation, mapping window coordinates  back  to
              graph  coordinates,  using  the  standard  X-axis  and  Y-axis.   Returns a list of
              containing the graph coordinates.

       pathName legend operation ?arg?...
              See the LEGEND COMPONENT section.

       pathName line elemName ?option value?...
              The operation is the same as element.

       pathName marker operation ?arg?...
              See the MARKER COMPONENTS section.

       pathName metafile ?fileName?
              This operation is for Window platforms only.  Creates a Windows  enhanced  metafile
              of  the  stripchart.   If  present,  fileName is the file name of the new metafile.
              Otherwise, the metafile is automatically added to the clipboard.

       pathName postscript operation ?arg?...
              See the POSTSCRIPT COMPONENT section.

       pathName snap photoName
              Takes a snapshot of the strip chart and stores the  contents  in  the  photo  image
              photoName.  PhotoName is the name of a Tk photo image that must already exist.

       pathName transform x y
              Performs   a   coordinate  transformation,  mapping  graph  coordinates  to  window
              coordinates, using the standard X-axis and Y-axis.  Returns a list  containing  the
              X-Y screen coordinates.

       pathName xaxis operation ?arg?...

       pathName x2axis operation ?arg?...

       pathName yaxis operation ?arg?...

       pathName y2axis operation ?arg?...
              See the AXIS COMPONENTS section.

STRIPCHART COMPONENTS

       A  strip  chart is composed of several components: coordinate axes, data elements, legend,
       grid, cross hairs,  postscript,  and  annotation  markers.  Instead  of  one  big  set  of
       configuration options and operations, the strip chart is partitioned, where each component
       has its own configuration options and operations that specifically control that aspect  or
       part of the strip chart.

   AXIS COMPONENTS
       Four  coordinate  axes are automatically created: two X-coordinate axes (x and x2) and two
       Y-coordinate axes (y, and y2).  By default, the axis x is located in the bottom margin,  y
       in the left margin, x2 in the top margin, and y2 in the right margin.

       An  axis  consists of the axis line, title, major and minor ticks, and tick labels.  Major
       ticks are drawn at uniform intervals along the  axis.   Each  tick  is  labeled  with  its
       coordinate value.  Minor ticks are drawn at uniform intervals within major ticks.

       The  range  of  the axis controls what region of data is plotted.  Data points outside the
       minimum and maximum limits of the axis are not  plotted.   By  default,  the  minimum  and
       maximum limits are determined from the data, but you can reset either limit.

       You  can create and use several axes. To create an axis, invoke the axis component and its
       create operation.

              # Create a new axis called "temperature"
              .s axis create temperature

       You map data elements to an  axis  using  the  element's  -mapy  and  -mapx  configuration
       options. They specify the coordinate axes an element is mapped onto.

              # Now map the temperature data to this axis.
              .s element create "temp" -xdata $x -ydata $tempData \
                  -mapy temperature

       While  you  can  have many axes, only four axes can be displayed simultaneously.  They are
       drawn in each of the margins surrounding the plotting area.  The axes x and y are drawn in
       the  bottom and left margins. The axes x2 and y2 are drawn in top and right margins.  Only
       x and y are shown by default. Note that the axes can have different scales.

       To display a different axis, you invoke one of the  following  components:  xaxis,  yaxis,
       x2axis,  and  y2axis.   The  use  operation  designates  the  axis  to  be  drawn  in  the
       corresponding margin: xaxis in the bottom, yaxis in the  left,  x2axis  in  the  top,  and
       y2axis in the right.

              # Display the axis temperature in the left margin.
              .s yaxis use temperature

       You  can  configure  axes  in many ways. The axis scale can be linear or logarithmic.  The
       values along the axis can either monotonically increase or decrease.  If you  need  custom
       tick  labels,  you  can  specify a Tcl procedure to format the label as you wish.  You can
       control how ticks are drawn, by changing the major tick interval or the  number  of  minor
       ticks.  You can define non-uniform tick intervals, such as for time-series plots.

       pathName axis cget axisName option
              Returns  the  current value of the option given by option for axisName.  Option may
              be any option described below for the axis configure operation.

       pathName axis configure axisName ?option value?...
              Queries or modifies  the  configuration  options  of  axisName.   If  option  isn't
              specified,  a list describing all the current options for axisName is returned.  If
              option is specified, but not value, then a list describing option is returned.   If
              one  or  more  option  and  value pairs are specified, then for each pair, the axis
              option option is set to value.  The following options are valid for axes.

              -autorange range
                     Sets the range of values for  the  axis  to  range.   The  axis  limits  are
                     automatically  reset   to display the most recent data points in this range.
                     If range is 0.0, the range is determined from the limits of  the  data.   If
                     -min or -max are specified, they override this option.  The default is 0.0.

              -color color
                     Sets the color of the axis and tick labels.  The default is black.

              -command prefix
                     Specifies  a Tcl command to be invoked when formatting the axis tick labels.
                     Prefix is a string containing the name of a Tcl proc and any extra arguments
                     for the procedure.  This command is invoked for each major tick on the axis.
                     Two additional arguments are passed to the procedure: the  pathname  of  the
                     widget and the current the numeric value of the tick.  The procedure returns
                     the formatted tick label.  If "" is returned, no label will appear  next  to
                     the  tick.   You can get the standard tick labels again by setting prefix to
                     "".  The default is "".

                     Please note that this procedure is invoked while the strip chart is redrawn.
                     You  may  query  the  configuration options.  But do not reset them, because
                     this can have unexpected results.

              -descending boolean
                     Indicates whether the values along the axis are monotonically increasing  or
                     decreasing.   If  boolean  is true, the axis values will be decreasing.  The
                     default is 0.

              -hide boolean
                     Indicates whether the axis is displayed.

              -justify justify
                     Specifies how the axis title should be justified.  This  matters  only  when
                     the  axis  title  contains more than one line of text. Justify must be left,
                     right, or center.  The default is center.

              -limits formatStr
                     Specifies a printf-like description to format the minimum and maximum limits
                     of the axis.  The limits are displayed at the top/bottom or left/right sides
                     of  the  plotting  area.   FormatStr  is  a  list  of  one  or  two   format
                     descriptions.   If one description is supplied, both the minimum and maximum
                     limits are formatted in the same way.  If  two,  the  first  designates  the
                     format for the minimum limit, the second for the maximum.  If "" is given as
                     either description, then the that limit will not be displayed.  The  default
                     is "".

              -linewidth pixels
                     Sets the width of the axis and tick lines.  The default is 1 pixel.

              -logscale boolean
                     Indicates  whether  the  scale  of  the  axis  is logarithmic or linear.  If
                     boolean is true, the axis is logarithmic.  The default scale is linear.

              -loose boolean
                     Indicates whether the limits of the axis should fit the data points tightly,
                     at the outermost data points, or loosely, at the outer tick intervals.  This
                     is relevant only when  the  axis  limit  is  automatically  calculated.   If
                     boolean is true, the axis range is "loose".  The default is 0.

              -majorticks majorList
                     Specifies  where  to  display  major axis ticks.  You can use this option to
                     display ticks at  non-uniform  intervals.   MajorList  is  a  list  of  axis
                     coordinates  designating  the  location  of major ticks.  No minor ticks are
                     drawn.  If majorList is "", major ticks will be automatically computed.  The
                     default is "".

              -max value
                     Sets  the  maximum  limit of axisName.  Any data point greater than value is
                     not displayed.  If value is "", the maximum limit is  calculated  using  the
                     largest data value.  The default is "".

              -min value
                     Sets  the  minimum  limit of axisName. Any data point less than value is not
                     displayed.  If value is "",  the  minimum  limit  is  calculated  using  the
                     smallest data value.  The default is "".

              -minorticks minorList
                     Specifies  where  to  display  minor axis ticks.  You can use this option to
                     display minor ticks at non-uniform intervals. MinorList is a  list  of  real
                     values,  ranging from 0.0 to 1.0, designating the placement of a minor tick.
                     No minor ticks are drawn if the -majortick option is also set.  If minorList
                     is "", minor ticks will be automatically computed. The default is "".

              -rotate theta
                     Specifies  the  how many degrees to rotate the axis tick labels.  Theta is a
                     real value representing the number of degrees to  rotate  the  tick  labels.
                     The default is 0.0 degrees.

              -shiftby value
                     Specifies  how  much to automatically shift the range of the axis.  When the
                     new data exceeds the current axis  maximum,  the  maximum  is  increased  in
                     increments  of  value.   You  can use this option to prevent the axis limits
                     from being recomputed at each new time point.  If  value  is  0.0,  then  no
                     automatic shifting is done. The default is 0.0.

              -showticks boolean
                     Indicates  whether axis ticks should be drawn. If boolean is true, ticks are
                     drawn.  If false, only the axis line is drawn. The default is 1.

              -stepsize value
                     Specifies the interval between major axis ticks.  If  value  isn't  a  valid
                     interval  (must be less than the axis range), the request is ignored and the
                     step size is automatically calculated.

              -subdivisions number
                     Indicates how many minor axis ticks are to be drawn.  For example, if number
                     is  two, only one minor tick is drawn.  If number is one, no minor ticks are
                     displayed.  The default is 2.

              -tickfont fontName
                     Specifies the font for axis tick labels. The  default  is  *-Courier-Bold-R-
                     Normal-*-100-*.

              -ticklength pixels
                     Sets the length of major and minor ticks (minor ticks are half the length of
                     major ticks). If pixels is less than zero, the axis will  be  inverted  with
                     ticks drawn pointing towards the plot.  The default is 0.1i.

              -title text
                     Sets the title of the axis. If text is "", no axis title will be displayed.

              -titlecolor color
                     Sets the color of the axis title. The default is black.

              -titlefont fontName
                     Specifies  the  font  for  axis  title.  The  default is *-Helvetica-Bold-R-
                     Normal-*-14-140-*.

              Axis configuration options may be also be set by the option command.  The  resource
              class is Axis.  The resource names are the names of the axes (such as x or x2).

                     option add *Stripchart.Axis.Color  blue
                     option add *Stripchart.x.LogScale  true
                     option add *Stripchart.x2.LogScale false

       pathName axis create axisName ?option value?...
              Creates  a  new  axis  by  the name axisName.  No axis by the same name can already
              exist. Option and value are described in above in the axis configure operation.

       pathName axis delete ?axisName?...
              Deletes the named axes. An axis is not really deleted until it  is  not  longer  in
              use, so it's safe to delete axes mapped to elements.

       pathName axis invtransform axisName value
              Performs  the  inverse  transformation,  changing  the screen coordinate value to a
              graph coordinate,  mapping  the  value  mapped  to  axisName.   Returns  the  graph
              coordinate.

       pathName axis limits axisName
              Returns  a  list  of the minimum and maximum limits for axisName.  The order of the
              list is min max.

       pathName axis names ?pattern?...
              Returns a list of axes matching zero or more patterns.  If no pattern  argument  is
              give, the names of all axes are returned.

       pathName axis transform axisName value
              Transforms  the  coordinate  value  to  a  screen  coordinate  by mapping the it to
              axisName.  Returns the transformed screen coordinate.

       Only four axes can be displayed simultaneously.  By default, they are x, y,  x2,  and  y2.
       You can swap in a different axis with use operation of the special axis components: xaxis,
       x2axis, yaxis, and y2axis.

              .g create axis temp
              .g create axis time
              ...
              .g xaxis use temp
              .g yaxis use time

       Only the axes specified for use are displayed on the screen.

       The xaxis, x2axis, yaxis, and y2axis components operate on an axis location rather than  a
       specific  axis like the more general axis component does.  The xaxis component manages the
       X-axis located in the bottom margin (whatever axis that happens to be).   Likewise,  yaxis
       uses the Y-axis in the left margin, x2axis the top X-axis, and y2axis the right Y-axis.

       They  implicitly  control  the axis that is currently using to that location.  By default,
       xaxis uses the x axis, yaxis uses y, x2axis uses x2, and y2axis uses y2.  These components
       can  be  more  convenient  to  use  than  always  determining  what axes are current being
       displayed by the graph.

       The following operations are available for axes. They mirror exactly the operations of the
       axis component.  The axis argument must be xaxis, x2axis, yaxis, or y2axis.

       pathName axis cget option

       pathName axis configure ?option value?...

       pathName axis invtransform value

       pathName axis limits

       pathName axis transform value

       pathName axis use ?axisName?
              Designates the axis axisName is to be displayed at this location.  AxisName can not
              be already in use at another location.  This command returns the name of  the  axis
              currently using this location.

   CROSSHAIRS COMPONENT
       Cross  hairs  consist  of  two  intersecting lines (one vertical and one horizontal) drawn
       completely across the plotting area.  They are used to position the mouse in  relation  to
       the  coordinate  axes.   Cross hairs differ from line markers in that they are implemented
       using XOR drawing primitives.  This means that  they  can  be  quickly  drawn  and  erased
       without redrawing the entire strip chart.

       The following operations are available for cross hairs:

       pathName crosshairs cget option
              Returns  the current value of the cross hairs configuration option given by option.
              Option may be any option described below for the cross hairs configure operation.

       pathName crosshairs configure ?option value?...
              Queries or modifies the configuration options of the cross hairs.  If option  isn't
              specified,  a  list  describing  all  the  current  options  for the cross hairs is
              returned.  If option is specified, but not value, then a list describing option  is
              returned.  If one or more option and value pairs are specified, then for each pair,
              the cross hairs option option is set to value.  The following options are available
              for cross hairs.

              -color color
                     Sets the color of the cross hairs.  The default is black.

              -dashes dashList
                     Sets  the  dash  style  of  the  cross hairs. DashList is a list of up to 11
                     numbers that alternately represent the lengths of the dashes and gaps on the
                     cross  hair  lines.   Each number must be between 1 and 255.  If dashList is
                     "", the cross hairs will be solid lines.

              -hide boolean
                     Indicates whether cross hairs are drawn. If boolean is true, cross hairs are
                     not drawn.  The default is yes.

              -linewidth pixels
                     Set the width of the cross hair lines.  The default is 1.

              -position pos
                     Specifies  the screen position where the cross hairs intersect.  Pos must be
                     in the form "@x,y", where  x  and  y  are  the  window  coordinates  of  the
                     intersection.

              Cross  hairs  configuration  options may be also be set by the option command.  The
              resource name and class are crosshairs and Crosshairs respectively.

                     option add *Stripchart.Crosshairs.LineWidth 2
                     option add *Stripchart.Crosshairs.Color     red

       pathName crosshairs off
              Turns of the cross hairs.

       pathName crosshairs on
              Turns on the display of the cross hairs.

       pathName crosshairs toggle
              Toggles the current state of the cross hairs, alternately mapping and unmapping the
              cross hairs.

   ELEMENT COMPONENTS
       A  data  element  represents  a  set  of data.  It contains x and y vectors containing the
       coordinates of the data points.  Elements can be displayed with  a  symbol  at  each  data
       point  and lines connecting the points.  Elements also control the appearance of the data,
       such as the symbol type, line width, color etc.

       When new data elements are created, they are automatically added to a  list  of  displayed
       elements.   The display list controls what elements are drawn and in what order.

       The following operations are available for elements.

       pathName element activate elemName ?index?...
              Specifies  the  data points of element elemName to be drawn using active foreground
              and background colors.  ElemName is the name of the element and index is  a  number
              representing  the  index of the data point. If no indices are present then all data
              points become active.

       pathName element cget elemName option
              Returns the current value of the element  configuration  option  given  by  option.
              Option may be any option described below for the element configure operation.

       pathName element closest x y varName ?option value?... ?elemName?...
              Finds  the  data  point  closest  to  the window coordinates x and y in the element
              elemName.  ElemName is the name of an element, that must  not  be  hidden.   If  no
              elements are specified, then all visible elements are searched.  It returns via the
              array variable varName the name of the closest element, the index  of  its  closest
              point,  and  the graph coordinates of the point. Returns 0, if no data point within
              the threshold distance can be  found,  otherwise  1  is  returned.   The  following
              option-value pairs are available.

              -halo pixels
                     Specifies  a  threshold  distance  where  selected  data points are ignored.
                     Pixels is a valid screen distance, such as 2 or 1.2i.  If this option  isn't
                     specified, then it defaults to the value of the stripchart's -halo option.

              -interpolate boolean
                     Indicates  that  both the data points and interpolated points along the line
                     segment formed should be considered.  If boolean is true, the  closest  line
                     segment  will be selected instead of the closest point. If this option isn't
                     specified, boolean defaults to 0.

       pathName element configure elemName ?option value?...
              Queries or modifies the  configuration  options  for  elements.   If  option  isn't
              specified,  a list describing all the current options for elemName is returned.  If
              option is specified, but not value, then a list describing  the  option  option  is
              returned.  If one or more option and value pairs are specified, then for each pair,
              the element option option is set to value.  The following  options  are  valid  for
              elements.

              -activepen penName
                     Specifies  pen  to  use to draw active element.  If penName is "", no active
                     elements will be drawn.  The default is activeLine.

              -color color
                     Sets the color of the traces connecting the data points.

              -dashes dashList
                     Sets the dash style of element line. DashList is a list of up to 11  numbers
                     that alternately represent the lengths of the dashes and gaps on the element
                     line.  Each number must be between 1 and 255.  If dashList is "", the  lines
                     will be solid.

              -data coordList
                     Specifies  the  X-Y coordinates of the data.  CoordList is a list of numeric
                     expressions representing the X-Y coordinate pairs of each data point.

              -fill color
                     Sets the interior color of symbols.  If color is "", then  the  interior  of
                     the symbol is transparent.  If color is defcolor, then the color will be the
                     same as the -color option.  The default is defcolor.

              -hide boolean
                     Indicates whether the element is displayed.  The default is no.

              -label text
                     Sets the element's label in the legend.  If text is  "",  the  element  will
                     have no entry in the legend.  The default label is the element's name.

              -linewidth pixels
                     Sets the width of the connecting lines between data points.  If pixels is 0,
                     no connecting lines will be drawn between symbols.  The default is 0.

              -mapx xAxis
                     Selects the X-axis to map the element's X-coordinates onto.  XAxis  must  be
                     the name of an axis.  The default is x.

              -mapy yAxis
                     Selects  the  Y-axis to map the element's Y-coordinates onto.  YAxis must be
                     the name of an axis. The default is y.

              -offdash color
                     Sets the color of the stripes  when  traces  are  dashed  (see  the  -dashes
                     option).   If color is "", then the "off" pixels will represent gaps instead
                     of stripes.  If color is defcolor, then the color will be the  same  as  the
                     -color option.  The default is defcolor.

              -outline color
                     Sets  the  color or the outline around each symbol.  If color is "", then no
                     outline is drawn. If color is defcolor, then the color will be the  same  as
                     the -color option.  The default is defcolor.

              -outlinewidth pixels
                     Sets  the  width  of  the outline bordering each symbol.  If pixels is 0, no
                     outline will be drawn. The default is 1.

              -pixels pixels
                     Sets the size of symbols.  If pixels is 0, no symbols will  be  drawn.   The
                     default is 0.125i.

              -scalesymbols boolean
                     If  boolean  is true, the size of the symbols drawn for elemName will change
                     with scale of the X-axis and Y-axis.  At the time this option  is  set,  the
                     current  ranges  of  the  axes are saved as the normalized scales (i.e scale
                     factor is 1.0) and the element is drawn at  its  designated  size  (see  the
                     -pixels option).  As the scale of the axes change, the symbol will be scaled
                     according to the smaller of the X-axis and Y-axis  scales.   If  boolean  is
                     false, the element's symbols are drawn at the designated size, regardless of
                     axis scales.  The default is 0.

              -smooth smooth
                     Specifies how connecting  line  segments  are  drawn  between  data  points.
                     Smooth  can  be  either  linear,  step, natural, or quadratic.  If smooth is
                     linear, a single line segment is drawn, connecting both  data  points.  When
                     smooth  is step, two line segments are drawn. The first is a horizontal line
                     segment which steps the next x-coordinate.  The second is a  vertical  line,
                     moving  to  the  next  y-coordinate.   Both  natural  and quadratic generate
                     multiple segments  between  data  points.   If  natural,  the  segments  are
                     generated  using  a cubic spline.  If quadratic, a quadratic spline is used.
                     The default is linear.

              -styles styleList
                     Specifies what pen to use based upon the range of weights given.   StyleList
                     is  a  list of style specifications. Each style specification, in turn, is a
                     list consisting of a pen name, and optionally a minimum and  maximum  range.
                     Data  points  whose weight (see the -weight option) falls in this range, are
                     drawn with this pen.  If no range is specified it defaults to the number  of
                     the pen in the list.

              -symbol symbol
                     Specifies  the symbol for data points.  Symbol can be either square, circle,
                     diamond, plus, cross, splus,  scross,  triangle,  ""  (where  no  symbol  is
                     drawn), or a bitmap.  Bitmaps are specified as "source ?mask?", where source
                     is the name of the bitmap, and mask is  the  bitmap's  optional  mask.   The
                     default is circle.

              -weights wVec
                     Specifies  the  weights of the individual data points.  This, in conjunction
                     with the list pen styles (see the -styles option) controls how  data  points
                     are  drawn.   WVec  is  the  name  of  a  BLT  vector  or  a list of numeric
                     expressions representing the weights for each data point.

              -xdata xVec
                     Specifies the x-coordinates of the data.  XVec is the name of a  BLT  vector
                     or a list of numeric expressions.

              -ydata yVec
                     Specifies  the  y-coordinates of the data.  YVec is the name of a BLT vector
                     or a list of numeric expressions.

              Element configuration options may also be set by the option command.  The  resource
              class is Element. The resource name is the name of the element.

                     option add *Stripchart.Element.symbol line
                     option add *Stripchart.e1.symbol line

       pathName element create elemName ?option value?...
              Creates  a  new  element  elemName.   It's  an error is an element elemName already
              exists.  If additional arguments  are  present,  they  specify  options  valid  for
              element configure operation.

       pathName element deactivate elemName ?elemName?...
              Deactivates  all  the elements matching pattern.  Elements whose names match any of
              the patterns given are redrawn using their normal colors.

       pathName element delete ?elemName?...
              Deletes all the named elements.  The graph is automatically redrawn.

       pathName element exists elemName
              Returns 1 if an element elemName currently exists and 0 otherwise.

       pathName element names ?pattern?...
              Returns the elements matching one or more pattern.  If no  pattern  is  given,  the
              names of all elements is returned.

       pathName element show ?nameList?
              Queries  or modifies the element display list.  The element display list designates
              the elements drawn and in what  order.  NameList  is  a  list  of  elements  to  be
              displayed  in  the  order  they  are  named.  If there is no nameList argument, the
              current display list is returned.

       pathName element type elemName
              Returns the type of elemName.  If the  element  is  a  bar  element,  the  commands
              returns the string "bar", otherwise it returns "line".

   GRID COMPONENT
       Grid  lines  extend from the major and minor ticks of each axis horizontally or vertically
       across the plotting area.  The following operations are available for grid lines.

       pathName grid cget option
              Returns the current value of the grid line configuration option  given  by  option.
              Option may be any option described below for the grid configure operation.

       pathName grid configure ?option value?...
              Queries  or  modifies  the  configuration  options for grid lines.  If option isn't
              specified, a list describing all the current grid options for pathName is returned.
              If  option  is specified, but not value, then a list describing option is returned.
              If one or more option and value pairs are specified, then for each pair,  the  grid
              line  option  option  is  set  to  value.  The following options are valid for grid
              lines.

              -color color
                     Sets the color of the grid lines.  The default is black.

              -dashes dashList
                     Sets the dash style of the grid lines. DashList  is  a  list  of  up  to  11
                     numbers that alternately represent the lengths of the dashes and gaps on the
                     grid lines.  Each number must be between 1 and 255.  If dashList is "",  the
                     grid will be solid lines.

              -hide boolean
                     Indicates  whether  the grid should be drawn. If boolean is true, grid lines
                     are not shown. The default is yes.

              -linewidth pixels
                     Sets the width of grid lines.  The default width is 1.

              -mapx xAxis
                     Specifies the X-axis to display grid lines.  XAxis must be the  name  of  an
                     axis.  The default is x.

              -mapy yAxis
                     Specifies  the  Y-axis  to display grid lines.  YAxis must be the name of an
                     axis. The default is y.

              -minor boolean
                     Indicates whether the grid lines  should  be  drawn  for  minor  ticks.   If
                     boolean is true, the lines will appear at minor tick intervals.  The default
                     is 1.

              Grid configuration options may also be set by the  option  command.   The  resource
              name and class are grid and Grid respectively.

                     option add *Stripchart.grid.LineWidth 2
                     option add *Stripchart.Grid.Color     black

       pathName grid off
              Turns off the display the grid lines.

       pathName grid on
              Turns on the display the grid lines.

       pathName grid toggle
              Toggles the display of the grid.

   LEGEND COMPONENT
       The  legend  displays  a  list of the data elements.  Each entry consists of the element's
       symbol and label.  The legend can appear in any margin (the default  location  is  in  the
       right margin).  It can also be positioned anywhere within the plotting area.

       The following operations are valid for the legend.

       pathName legend activate pattern...
              Selects  legend entries to be drawn using the active legend colors and relief.  All
              entries whose element names match pattern   are  selected.   To  be  selected,  the
              element name must match only one pattern.

       pathName legend cget option
              Returns  the  current  value  of  a legend configuration option.  Option may be any
              option described below in the legend configure operation.

       pathName legend configure ?option value?...
              Queries or modifies the configuration options for  the  legend.   If  option  isn't
              specified,  a  list describing the current legend options for pathName is returned.
              If option is specified, but not value, then a list describing option  is  returned.
              If one or more option and value pairs are specified, then for each pair, the legend
              option option is set to value.  The following options are valid for the legend.

              -activebackground color
                     Sets the background color for active legend  entries.   All  legend  entries
                     marked  active  (see  the  legend  activate  operation) are drawn using this
                     background color.

              -activeborderwidth pixels
                     Sets the width of the 3-D border around  the  outside  edge  of  the  active
                     legend entries.  The default is 2.

              -activeforeground color
                     Sets  the  foreground  color  for active legend entries.  All legend entries
                     marked as active (see the legend activate operation) are  drawn  using  this
                     foreground color.

              -activerelief relief
                     Specifies  the 3-D effect desired for active legend entries.  Relief denotes
                     how the interior of the entry should appear  relative  to  the  legend;  for
                     example,  raised  means the entry should appear to protrude from the legend,
                     relative to the surface of the legend.  The default is flat.

              -anchor anchor
                     Tells how to position the legend relative to the positioning point  for  the
                     legend.   This  is  dependent  on  the  value  of the -position option.  The
                     default is center.

                     left or right
                                 The anchor describes how to position the legend vertically.

                     top or bottom
                                 The anchor describes how to position the legend horizontally.

                     @x,y        The anchor specifies how to position the legend relative to  the
                                 positioning  point.  For  example,  if anchor is center then the
                                 legend is centered on the point; if anchor is n then the  legend
                                 will  be drawn such that the top center point of the rectangular
                                 region occupied by the legend will be at the positioning point.

                     plotarea    The anchor specifies how to position the legend relative to  the
                                 plotting  area. For example, if anchor is center then the legend
                                 is centered in the plotting area;  if  anchor  is  ne  then  the
                                 legend  will  be drawn such that occupies the upper right corner
                                 of the plotting area.

              -background color
                     Sets the background color  of  the  legend.  If  color  is  "",  the  legend
                     background with be transparent.

              -borderwidth pixels
                     Sets  the  width of the 3-D border around the outside edge of the legend (if
                     such border is being drawn; the relief option determines this).  The default
                     is 2 pixels.

              -font fontName
                     FontName  specifies  a  font  to use when drawing the labels of each element
                     into the legend.  The default is *-Helvetica-Bold-R-Normal-*-12-120-*.

              -foreground color
                     Sets the foreground color of the text drawn for the  element's  label.   The
                     default is black.

              -hide boolean
                     Indicates  whether  the  legend should be displayed. If boolean is true, the
                     legend will not be draw.  The default is no.

              -ipadx pad
                     Sets the amount of internal padding to be added to the width of each  legend
                     entry.   Pad  can  be a list of one or two screen distances.  If pad has two
                     elements, the left side of the legend entry is padded by the first  distance
                     and  the  right  side  by the second.  If pad is just one distance, both the
                     left and right sides are padded evenly.  The default is 2.

              -ipady pad
                     Sets an amount of internal padding to be added to the height of each  legend
                     entry.   Pad  can  be a list of one or two screen distances.  If pad has two
                     elements, the top of the entry is padded  by  the  first  distance  and  the
                     bottom  by the second.  If pad is just one distance, both the top and bottom
                     of the entry are padded evenly.  The default is 2.

              -padx pad
                     Sets the padding to the left and right exteriors of the legend.  Pad can  be
                     a  list  of  one or two screen distances.  If pad has two elements, the left
                     side of the legend is padded by the first distance and the right side by the
                     second.   If  pad  has  just one distance, both the left and right sides are
                     padded evenly.  The default is 4.

              -pady pad
                     Sets the padding above and below the legend.  Pad can be a list  of  one  or
                     two screen distances.  If pad has two elements, the area above the legend is
                     padded by the first distance and the area below by the second.   If  pad  is
                     just  one  distance,  both  the top and bottom areas are padded evenly.  The
                     default is 0.

              -position pos
                     Specifies where the legend is drawn. The -anchor option also  affects  where
                     the  legend is positioned.  If pos is left, left, top, or bottom, the legend
                     is drawn in the specified margin.  If pos is plotarea, then  the  legend  is
                     drawn  inside  the  plotting  area at a particular anchor.  If pos is in the
                     form "@x,y", where x and y are the window coordinates, the legend  is  drawn
                     in the plotting area at the specified coordinates.  The default is right.

              -raised boolean
                     Indicates  whether  the  legend  is  above or below the data elements.  This
                     matters only if the legend is in the plotting area.  If boolean is true, the
                     legend will be drawn on top of any elements that may overlap it. The default
                     is no.

              -relief relief
                     Specifies the 3-D effect for the border around the legend.  Relief specifies
                     how  the  interior  of the legend should appear relative to the strip chart;
                     for example, raised means the legend should  appear  to  protrude  from  the
                     strip  chart,  relative  to  the surface of the strip chart.  The default is
                     sunken.

              Legend configuration options may also be set by the option command.   The  resource
              name and class are legend and Legend respectively.

                     option add *Stripchart.legend.Foreground blue
                     option add *Stripchart.Legend.Relief     raised

       pathName legend deactivate pattern...
              Selects  legend entries to be drawn using the normal legend colors and relief.  All
              entries whose element names match  pattern  are  selected.   To  be  selected,  the
              element name must match only one pattern.

       pathName legend get pos
              Returns  the  name  of the element whose entry is at the screen position pos in the
              legend.  Pos must be in the form "@x,y", where x and y are window coordinates.   If
              the given coordinates do not lie over a legend entry, "" is returned.

   PEN COMPONENTS
       Pens  define  attributes  (both  symbol  and  line  style)  for elements.  Pens mirror the
       configuration options of data elements that pertain to how symbols and  lines  are  drawn.
       Data  elements  use  pens to determine how they are drawn.  A data element may use several
       pens at once.  In this case, the pen used for a particular data point is  determined  from
       each element's weight vector (see the element's -weight and -style options).

       One pen, called activeLine, is automatically created.  It's used as the default active pen
       for elements. So you  can  change  the  active  attributes  for  all  elements  by  simply
       reconfiguring this pen.

              .s pen configure "activeLine" -color green

       You  can  create and use any number of pens. To create a pen, invoke the pen component and
       its create operation.

              .s pen create myPen

       You map pens to a data element using either the element's -pen or -activepen options.

              .s element create "line1" -xdata $x -ydata $tempData \
                  -pen myPen

       An element can use several pens at once. This is done by specifying the name of the pen in
       the element's style list (see the -styles option).

              .s element configure "line1" -styles { myPen 2.0 3.0 }

       This  says  that any data point with a weight between 2.0 and 3.0 is to be drawn using the
       pen myPen.  All other points are drawn with the element's default attributes.

       The following operations are available for pen components.

       pathName pen cget penName option
              Returns the current value of the option given by option for penName.  Option may be
              any option described below for the pen configure operation.

       pathName pen configure penName ?option value?...
              Queries  or  modifies  the  configuration  options  of  penName.   If  option isn't
              specified, a list describing the current  options  for  penName  is  returned.   If
              option  is specified, but not value, then a list describing option is returned.  If
              one or more option and value pairs are specified,  then  for  each  pair,  the  pen
              option option is set to value.  The following options are valid for pens.

              -color color
                     Sets the color of the traces connecting the data points.

              -dashes dashList
                     Sets  the dash style of element line. DashList is a list of up to 11 numbers
                     that alternately represent the lengths of the dashes and gaps on the element
                     line.   Each number must be between 1 and 255.  If dashList is "", the lines
                     will be solid.

              -fill color
                     Sets the interior color of symbols.  If color is "", then  the  interior  of
                     the symbol is transparent.  If color is defcolor, then the color will be the
                     same as the -color option.  The default is defcolor.

              -linewidth pixels
                     Sets the width of the connecting lines between data points.  If pixels is 0,
                     no connecting lines will be drawn between symbols.  The default is 0.

              -offdash color
                     Sets  the  color  of  the  stripes  when  traces are dashed (see the -dashes
                     option).  If color is "", then the "off" pixels will represent gaps  instead
                     of  stripes.   If  color is defcolor, then the color will be the same as the
                     -color option.  The default is defcolor.

              -outline color
                     Sets the color or the outline around each symbol.  If color is "",  then  no
                     outline  is  drawn. If color is defcolor, then the color will be the same as
                     the -color option.  The default is defcolor.

              -outlinewidth pixels
                     Sets the width of the outline bordering each symbol.  If  pixels  is  0,  no
                     outline will be drawn. The default is 1.

              -pixels pixels
                     Sets  the  size  of symbols.  If pixels is 0, no symbols will be drawn.  The
                     default is 0.125i.

              -symbol symbol
                     Specifies the symbol for data points.  Symbol can be either square,  circle,
                     diamond,  plus,  cross,  splus,  scross,  triangle,  ""  (where no symbol is
                     drawn), or a bitmap.  Bitmaps are specified as "source ?mask?", where source
                     is  the  name  of  the  bitmap, and mask is the bitmap's optional mask.  The
                     default is circle.

              -type elemType
                     Specifies the type of element the pen is  to  be  used  with.   This  option
                     should  only be employed when creating the pen.  This is for those that wish
                     to mix different types of elements (bars and lines) on the same graph.   The
                     default type is "line".

              Pen  configuration  options may be also be set by the option command.  The resource
              class is Pen.  The resource names are the names of the pens.

                     option add *Stripchart.Pen.Color  blue
                     option add *Stripchart.activeLine.color  green

       pathName pen create penName ?option value?...
              Creates a new pen by the name penName.  No pen by the same name can already  exist.
              Option and value are described in above in the pen configure operation.

       pathName pen delete ?penName?...
              Deletes  the named pens. A pen is not really deleted until it is not longer in use,
              so it's safe to delete pens mapped to elements.

       pathName pen names ?pattern?...
              Returns a list of pens matching zero or more patterns.  If no pattern  argument  is
              give, the names of all pens are returned.

   POSTSCRIPT COMPONENT
       The   strip  chart  can  generate  encapsulated  PostScript  output.   There  are  several
       configuration options you can specify to control how  the  plot  is  generated.   You  can
       change  the  page  dimensions  and  borders.   The plot itself can be scaled, centered, or
       rotated to landscape.  The PostScript output can be written directly to a file or returned
       through the interpreter.

       The following postscript operations are available.

       pathName postscript cget option
              Returns  the current value of the postscript option given by option.  Option may be
              any option described below for the postscript configure operation.

       pathName postscript configure ?option value?...
              Queries or modifies the configuration options for PostScript generation.  If option
              isn't  specified,  a list describing the current postscript options for pathName is
              returned.  If option is specified, but not value, then a list describing option  is
              returned.  If one or more option and value pairs are specified, then for each pair,
              the postscript option option is set to value.  The following postscript options are
              available.

              -center boolean
                     Indicates  whether  the  plot should be centered on the PostScript page.  If
                     boolean is false, the plot will be placed in the upper left  corner  of  the
                     page.  The default is 1.

              -colormap varName
                     VarName  must  be the name of a global array variable that specifies a color
                     mapping from the X color name to PostScript.  Each element of  varName  must
                     consist  of  PostScript code to set a particular color value (e.g. ``1.0 1.0
                     0.0 setrgbcolor'').  When outputting color information  in  PostScript,  the
                     array  variable  varName  is checked to see if an element of the name of the
                     color exists. If so, it uses the value of  the  element  as  the  PostScript
                     command to set the color.  If this option hasn't been specified, or if there
                     isn't an entry in varName for a given color, then it uses  the  red,  green,
                     and blue intensities from the X color.

              -colormode mode
                     Specifies  how  to output color information.  Mode must be either color (for
                     full  color  output),  gray  (convert  all  colors   to   their   gray-scale
                     equivalents)  or  mono  (convert  foreground  colors to black and background
                     colors to white).  The default mode is color.

              -fontmap varName
                     VarName must be the name of a global array variable that  specifies  a  font
                     mapping  from  the  X font name to PostScript.  Each element of varName must
                     consist of a Tcl list with one or two elements, which are the name and point
                     size  of  a  PostScript  font.   When  outputting  PostScript commands for a
                     particular font, the array variable varName is checked to see an element  of
                     the  specified  font  exists.   If  there  is such an element, then the font
                     information contained in that element is used in the PostScript output.  (If
                     the  point  size  is  omitted from the list, the point size of the X font is
                     used).  Otherwise the X font  is  examined  in  an  attempt  to  guess  what
                     PostScript font to use.  This works only for fonts whose foundry property is
                     Adobe (such as Times, Helvetica, Courier, etc.).  If all of this fails  then
                     the font defaults to Helvetica-Bold.

              -decorations boolean
                     Indicates  if  PostScript  commands  to  generate  color backgrounds and 3-D
                     borders should be output.  If boolean is false, the background will be white
                     and no 3-D borders will be generated. The default is 1.

              -height pixels
                     Sets  the  height  of  the  plot.   This lets you plot the stripchart with a
                     height different from the one displayed on the screen.  If pixels is 0,  the
                     height is the same as the displayed height.  The default is 0.

              -landscape boolean
                     If  boolean  is  true,  this  specifies the printed area is to be rotated 90
                     degrees.  In non-rotated output the X-axis of the printed  area  runs  along
                     the  short  dimension  of  the  page  (``portrait'' orientation); in rotated
                     output the X-axis runs along the long dimension of the  page  (``landscape''
                     orientation).  Defaults to 0.

              -maxpect boolean
                     Indicates  to  scale the the plot so that it fills the PostScript page.  The
                     aspect ratio of the strip chart is still retained.  The default is 0.

              -padx pad
                     Sets the horizontal padding for  the  left  and  right  page  borders.   The
                     borders  are  exterior  to the plot.  Pad can be a list of one or two screen
                     distances.  If pad has two elements, the left border is padded by the  first
                     distance  and the right border by the second.  If pad has just one distance,
                     both the left and right borders are padded evenly.  The default is 1i.

              -pady pad
                     Sets the vertical padding for the top and bottom page borders.  The  borders
                     are exterior to the plot.  Pad can be a list of one or two screen distances.
                     If pad has two elements, the top border is padded by the first distance  and
                     the bottom border by the second.  If pad has just one distance, both the top
                     and bottom borders are padded evenly.  The default is 1i.

              -paperheight pixels
                     Sets the height of the postscript page.  This can be used to select  between
                     different page sizes (letter, A4, etc).  The default height is 11.0i.

              -paperwidth pixels
                     Sets  the  width of the postscript page.  This can be used to select between
                     different page sizes (letter, A4, etc).  The default width is 8.5i.

              -width pixels
                     Sets the width of the plot.  This lets you plot the strip chart with a width
                     different  from  the  one drawn on the screen.  If pixels is 0, the width is
                     the same as the widget's width.  The default is 0.

              Postscript configuration options may be also be set by  the  option  command.   The
              resource name and class are postscript and Postscript respectively.

                     option add *Stripchart.postscript.Decorations false
                     option add *Stripchart.Postscript.Landscape   true

       pathName postscript output ?fileName? ?option value?...
              Outputs  a  file of encapsulated PostScript.  If a fileName argument isn't present,
              the command returns the PostScript. If any option-value pairs are present, they set
              configuration  options  controlling  how  the  PostScript is generated.  Option and
              value can be anything accepted by the postscript configure operation above.

   MARKER COMPONENTS
       Markers are simple drawing procedures used to annotate or highlight  areas  of  the  strip
       chart.   Markers  have  various  types:  text  strings,  bitmaps, images, connected lines,
       windows, or polygons.  They can be associated with a particular element, so that when  the
       element  is hidden or un-hidden, so is the marker.  By default, markers are the last items
       drawn, so that data elements  will  appear  in  behind  them.   You  can  change  this  by
       configuring the -under option.

       Markers,  in  contrast to elements, don't affect the scaling of the coordinate axes.  They
       can also have elastic coordinates (specified by -Inf and Inf respectively) that  translate
       into  the minimum or maximum limit of the axis.  For example, you can place a marker so it
       always remains in the lower left corner of the plotting area,  by  using  the  coordinates
       -Inf,-Inf.

       The following operations are available for markers.

       pathName marker after markerId ?afterId?
              Changes the order of the markers, drawing the first marker after the second.  If no
              second afterId argument is specified, the marker  is  placed  at  the  end  of  the
              display  list.  This command can be used to control how markers are displayed since
              markers are drawn in the order of this display list.

       pathName marker before markerId ?beforeId?
              Changes the order of the markers, drawing the first marker before the  second.   If
              no  second beforeId argument is specified, the marker is placed at the beginning of
              the display list.  This command can be used to control how  markers  are  displayed
              since markers are drawn in the order of this display list.

       pathName marker cget option
              Returns  the  current  value  of  the  marker configuration option given by option.
              Option may be any option described below in the configure operation.

       pathName marker configure markerId ?option value?...
              Queries or modifies  the  configuration  options  for  markers.   If  option  isn't
              specified,  a  list  describing  the  current options for markerId is returned.  If
              option is specified, but not value, then a list describing option is returned.   If
              one  or  more  option and value pairs are specified, then for each pair, the marker
              option option is set to value.

              The following options are valid for all markers.  Each type of marker also has  its
              own type-specific options.  They are described in the sections below.

              -coords coordList
                     Specifies  the  coordinates  of  the  marker.   CoordList is a list of graph
                     coordinates.  The number of coordinates required is dependent on the type of
                     marker.   Text,  image, and window markers need only two coordinates (an X-Y
                     coordinate).   Bitmap markers can take either two or  four  coordinates  (if
                     four,  they represent the corners of the bitmap). Line markers need at least
                     four coordinates, polygons at least six.  If coordList  is  "",  the  marker
                     will not be displayed.  The default is "".

              -element elemName
                     Links the marker with the element elemName.  The marker is drawn only if the
                     element is also currently displayed (see the element's show operation).   If
                     elemName is "", the marker is always drawn.  The default is "".

              -hide boolean
                     Indicates whether the marker is drawn. If boolean is true, the marker is not
                     drawn.  The default is no.

              -mapx xAxis
                     Specifies the X-axis to map the marker's X-coordinates onto.  XAxis must the
                     name of an axis.  The default is x.

              -mapy yAxis
                     Specifies the Y-axis to map the marker's Y-coordinates onto.  YAxis must the
                     name of an axis.  The default is y.

              -name markerId
                     Changes the identifier for the marker.   The  identifier  markerId  can  not
                     already  be  used  by  another  marker.  If this option isn't specified, the
                     marker's name is uniquely generated.

              -under boolean
                     Indicates whether the marker is drawn below/above data elements.  If boolean
                     is  true,  the  marker  is  be drawn underneath the data element symbols and
                     lines.  Otherwise, the marker is drawn on top of the element.   The  default
                     is 0.

              -xoffset pixels
                     Specifies  a screen distance to offset the marker horizontally.  Pixels is a
                     valid screen distance, such as 2 or 1.2i.  The default is 0.

              -yoffset pixels
                     Specifies a screen distance to offset the markers vertically.  Pixels  is  a
                     valid screen distance, such as 2 or 1.2i.  The default is 0.

              Marker  configuration  options may also be set by the option command.  The resource
              class is either BitmapMarker,  ImageMarker, LineMarker, PolygonMarker,  TextMarker,
              or WindowMarker, depending on the type of marker.  The resource name is the name of
              the marker.

                     option add *Stripchart.TextMarker.Foreground white
                     option add *Stripchart.BitmapMarker.Foreground white
                     option add *Stripchart.m1.Background     blue

       pathName marker create type ?option value?...
              Creates a marker of the selected type. Type  may  be  either  text,  line,  bitmap,
              image, polygon, or window.  This command returns the marker identifier, used as the
              markerId argument in the other marker-related commands.  If  the  -name  option  is
              used, this overrides the normal marker identifier.  If the name provided is already
              used for another marker, the new marker will replace the old.

       pathName marker delete ?name?...
              Removes one of more markers.  The graph will automatically be redrawn  without  the
              marker..

       pathName marker exists markerId
              Returns 1 if the marker markerId exists and 0 otherwise.

       pathName marker names ?pattern?
              Returns the names of all the markers that currently exist.  If pattern is supplied,
              only those markers whose names match it will be returned.

       pathName marker type markerId
              Returns the type of the marker given  by  markerId,  such  as  line  or  text.   If
              markerId is not a valid a marker identifier, "" is returned.

   BITMAP MARKERS
       A  bitmap marker displays a bitmap.  The size of the bitmap is controlled by the number of
       coordinates specified.  If two coordinates, they specify  the  position  of  the  top-left
       corner  of  the  bitmap.   The  bitmap  retains  its  normal  width  and  height.  If four
       coordinates, the first and second pairs  of  coordinates  represent  the  corners  of  the
       bitmap.   The  bitmap  will  be stretched or reduced as necessary to fit into the bounding
       rectangle.

       Bitmap markers are created with the marker's create operation in the form: pathName marker
       create  bitmap  ?option  value?...   There  may  be  many  option-value pairs, each sets a
       configuration options for the marker.  These same option-value pairs may be used with  the
       marker's configure operation.

       The following options are specific to bitmap markers:

       -background color
              Sets the background color of the bitmap.  If color is "", the background color will
              be transparent.  The default background color is white.

       -bitmap bitmap
              Specifies the bitmap to be displayed.  If bitmap is "",  the  marker  will  not  be
              displayed.  The default is "".

       -foreground color
              Sets the foreground color of the bitmap.  The default foreground color is black.

       -mask mask
              Specifies  a  mask  for  the  bitmap to be displayed. This mask is a bitmap itself,
              denoting the pixels that are transparent.  If mask is "", all pixels of the  bitmap
              will be drawn.  The default is "".

       -rotate theta
              Sets  the rotation of the bitmap.  Theta is a real number representing the angle of
              rotation in degrees.  The marker is first rotated and then placed according to  its
              anchor position.  The default rotation is 0.0.

   IMAGE MARKERS
       A  image  marker  displays  an  image.  Image markers are created with the marker's create
       operation in the form: pathName marker create image ?option value?...  There may  be  many
       option-value  pairs,  each  sets  a  configuration  option  for  the  marker.   These same
       option-value pairs may be used with the marker's configure operation.

       The following options are specific to image markers:

       -anchor anchor
              Anchor tells how to position the image relative to the positioning  point  for  the
              image.  For  example,  if anchor is center then the image is centered on the point;
              if anchor is n then the image will be drawn such that the top center point  of  the
              rectangular  region  occupied  by the image will be at the positioning point.  This
              option defaults to center.

       -image image
              Specifies the image to be drawn.  If image is "", the marker  will  not  be  drawn.
              The default is "".

   LINE MARKERS
       A line marker displays one or more connected line segments.  Line markers are created with
       marker's create operation in the form:  pathName  marker  create  line  ?option  value?...
       There  may  be  many  option-value pairs, each sets a configuration option for the marker.
       These same option-value pairs may be used with the marker's configure operation.

       The following options are specific to line markers:

       -background color
              Sets the background color of the line.  The option is affects the line  color  only
              when  the  -stipple option is set.  If this option isn't specified then it defaults
              to white.

       -dashes dashList
              Sets the dash style of the line. DashList is a  list  of  up  to  11  numbers  that
              alternately  represent the lengths of the dashes and gaps on the line.  Each number
              must be between 1 and 255.  If dashList is "", the marker line will be solid.

       -foreground color
              Sets the foreground color.  The default foreground color is black.

       -linewidth pixels
              Sets the width of the lines.  The default width is 0.

       -stipple bitmap
              Specifies a stipple pattern used to draw  the  line,  rather  than  a  solid  line.
              Bitmap specifies a bitmap to use as the stipple pattern.  If bitmap is "", then the
              line is drawn in a solid fashion. The default is "".

   POLYGON MARKERS
       A polygon marker displays a  closed  region  described  as  two  or  more  connected  line
       segments.   It  is  assumed  the first and last points are connected.  Polygon markers are
       created using the marker create operation in the  form:  pathName  marker  create  polygon
       ?option  value?...  There may be many option-value pairs, each sets a configuration option
       for the marker.  These same option-value pairs may  be  used  with  the  marker  configure
       command  to  change  the  marker's configuration.  The following options are supported for
       polygon markers:

       -dashes dashList
              Sets the dash style of the outline of the polygon. DashList is a list of up  to  11
              numbers  that  alternately  represent  the  lengths  of  the dashes and gaps on the
              outline.  Each number must be between 1 and 255. If dashList  is  "",  the  outline
              will be a solid line.

       -fill color
              Sets  the  fill  color  of  the  polygon.  If color is "", then the interior of the
              polygon is transparent.  The default is white.

       -linewidth pixels
              Sets the width of the outline of the polygon. If pixels  is  zero,  no  outline  is
              drawn. The default is 0.

       -outline color
              Sets  the color of the outline of the polygon.  If the polygon is stippled (see the
              -stipple option), then this represents the foreground color of  the  stipple.   The
              default is black.

       -stipple bitmap
              Specifies  that  the  polygon should be drawn with a stippled pattern rather than a
              solid color. Bitmap specifies a bitmap to use as the stipple pattern.  If bitmap is
              "",  then  the  polygon  is filled with a solid color (if the -fill option is set).
              The default is "".

   TEXT MARKERS
       A text marker displays a string of characters on one or  more  lines  of  text.   Embedded
       newlines  cause  line  breaks.   They  may be used to annotate regions of the strip chart.
       Text markers are created with the create operation in the  form:  pathName  marker  create
       text  ?option  value?...   There may be many option-value pairs, each sets a configuration
       option for the text marker.  These same option-value pairs may be used with  the  marker's
       configure operation.

       The following options are specific to text markers:

       -anchor anchor
              Anchor  tells  how  to  position the text relative to the positioning point for the
              text. For example, if anchor is center then the text is centered on the  point;  if
              anchor  is  n  then  the  text  will be drawn such that the top center point of the
              rectangular region occupied by the text will be at  the  positioning  point.   This
              default is center.

       -background color
              Sets  the background color of the text string.  If color is "", the background will
              be transparent.  The default is white.

       -font fontName
              Specifies the font of the text.  The default is *-Helvetica-Bold-R-Normal-*-120-*.

       -foreground color
              Sets the foreground color of the text.  The default is black.

       -justify justify
              Specifies how the text should be justified.  This  matters  only  when  the  marker
              contains  more  than one line of text. Justify must be left, right, or center.  The
              default is center.

       -padx pad
              Sets the padding to the left and right exteriors of the text.  Pad can be a list of
              one or two screen distances.  If pad has two elements, the left side of the text is
              padded by the first distance and the right side by the second.  If pad has just one
              distance, both the left and right sides are padded evenly.  The default is 4.

       -pady pad
              Sets  the padding above and below the text.  Pad can be a list of one or two screen
              distances.  If pad has two elements, the area above the text is padded by the first
              distance  and  the area below by the second.  If pad is just one distance, both the
              top and bottom areas are padded evenly.  The default is 4.

       -rotate theta
              Specifies the number of degrees to  rotate  the  text.   Theta  is  a  real  number
              representing  the  angle of rotation.  The marker is first rotated along its center
              and is then drawn according to its anchor position. The default is 0.0.

       -text text
              Specifies the text of the marker.  The exact way  the  text  is  displayed  may  be
              affected by other options such as -anchor or -rotate.

   WINDOW MARKERS
       A  window  marker  displays a widget at a given position.  Window markers are created with
       the marker's create operation in the form: pathName marker create window ?option value?...
       There  may  be  many  option-value pairs, each sets a configuration option for the marker.
       These same option-value pairs may be used with the marker's configure command.

       The following options are specific to window markers:

       -anchor anchor
              Anchor tells how to position the widget relative to the positioning point  for  the
              widget.  For example, if anchor is center then the widget is centered on the point;
              if anchor is n then the widget will be displayed such that the top center point  of
              the  rectangular  region  occupied  by the widget will be at the positioning point.
              This option defaults to center.

       -height pixels
              Specifies the height to assign to  the  marker's  window.   If  this  option  isn't
              specified,  or  if  it is specified as "", then the window is given whatever height
              the widget requests internally.

       -width pixels
              Specifies the width to assign  to  the  marker's  window.   If  this  option  isn't
              specified, or if it is specified as "", then the window is given whatever width the
              widget requests internally.

       -window pathName
              Specifies the widget to be managed.  PathName must be a  child  of  the  stripchart
              widget.

GRAPH COMPONENT BINDINGS

       Specific  stripchart  components, such as elements, markers and legend entries, can have a
       command trigger when event occurs in them, much like canvas items in Tk's  canvas  widget.
       Not  all  event  sequences  are  valid.  The only binding events that may be specified are
       those related to the mouse and keyboard (such as Enter, Leave,  ButtonPress,  Motion,  and
       KeyPress).

       Only  one  element or marker can be picked during an event.  This means, that if the mouse
       is directly over both an element and a marker, only the uppermost component  is  selected.
       This  isn't  true  for  legend  entries.   Both  a legend entry and an element (or marker)
       binding commands will be invoked if both items are picked.

       It is possible for multiple bindings to match a particular event.  This could  occur,  for
       example, if one binding is associated with the element name and another is associated with
       one of the element's tags (see the -bindtags  option).   When  this  occurs,  all  of  the
       matching  bindings  are  invoked.   A  binding associated with the element name is invoked
       first, followed by one binding for each of the element's bindtags.  If there are  multiple
       matching  bindings  for  a  single tag, then only the most specific binding is invoked.  A
       continue command in  a  binding  script  terminates  that  script,  and  a  break  command
       terminates that script and skips any remaining scripts for the event, just as for the bind
       command.

       The -bindtags option for these  components  controls  addition  tag  names  which  can  be
       matched.   Implicitly elements and markers always have tags matching their names.  Setting
       the value of the -bindtags option doesn't change this.

C LANGUAGE API

       You can manipulate data elements from the C language.  There may be situations where it is
       too  expensive to translate the data values from ASCII strings.  Or you might want to read
       data in a special file format.

       Data can manipulated from the C language using BLT vectors.  You specify the x and y  data
       coordinates  of  an  element as vectors and manipulate the vector from C.  The strip chart
       will be redrawn automatically after the vectors are updated.

       From Tcl, create the vectors and configure the element to use them.

              vector X Y
              .s element configure line1 -xdata X -ydata Y

       To set data  points  from  C,  you  pass  the  values  as  arrays  of  doubles  using  the
       Blt_ResetVector  call.   The  vector is reset with the new data and at the next idle point
       (when Tk re-enters its event loop), the strip chart will be redrawn automatically.

              #include <tcl.h>
              #include <blt.h>

              register int i;
              Blt_Vector *xVec, *yVec;
              double x[50], y[50];

              /* Get the BLT vectors "X" and "Y" (created above from Tcl) */
              if ((Blt_GetVector(interp, "X", 50, &xVec) != TCL_OK) ||
                  (Blt_GetVector(interp, "Y", 50, &yVec) != TCL_OK)) {
                  return TCL_ERROR;
              }

              for (i = 0; i < 50; i++) {
                  x[i] = i * 0.02;
                  y[i] = sin(x[i]);
              }

              /* Put the data into BLT vectors */
              if ((Blt_ResetVector(xVec, x, 50, 50, TCL_VOLATILE) != TCL_OK) ||
                  (Blt_ResetVector(yVec, y, 50, 50, TCL_VOLATILE) != TCL_OK)) {
                 return TCL_ERROR;
              }

       See the vector manual page for more details.

SPEED TIPS

       There may be cases where the strip chart needs to be  drawn  and  updated  as  quickly  as
       possible.   If  drawing  speed  becomes  a  big  problem,  here are a few tips to speed up
       displays.

       · Try to minimize the number of data points.  The more data points the looked at, the more
         work the strip chart must do.

       · If  your  data  is  generated as floating point values, the time required to convert the
         data values to and from ASCII strings can be significant, especially when there any many
         data  points.  You can avoid the redundant string-to-decimal conversions using the C API
         to BLT vectors.

       · Data elements without symbols  are  drawn  faster  than  with  symbols.   Set  the  data
         element's  -symbol  option  to  none.  If you need to draw symbols, try using the simple
         symbols such as splus and scross.

       · Don't stipple or dash the element.  Solid lines are much faster.

       · If you update data elements frequently, try turning  off  the  widget's  -bufferelements
         option.   When  the  strip  chart  is  first  displayed,  it draws data elements into an
         internal pixmap.  The pixmap acts as a cache, so that when the strip chart needs  to  be
         redrawn  again,  and the data elements or coordinate axes haven't changed, the pixmap is
         simply copied to the screen.  This is especially useful when you are  using  markers  to
         highlight  points  and  regions  on  the strip chart.  But if the strip chart is updated
         frequently, changing either the element data or coordinate axes, the  buffering  becomes
         redundant.

LIMITATIONS

       Auto-scale  routines  do  not  use requested min/max limits as boundaries when the axis is
       logarithmically scaled.

       The PostScript output generated for polygons with more than 1500  points  may  exceed  the
       limits  of  some printers (See PostScript Language Reference Manual, page 568).  The work-
       around is to break the polygon into separate pieces.

FUTURE INCOMPATIBILITY

       The -mapped options are obsoleted and will be removed.  You can achieve the  same  results
       using the -hide option instead.

              # Works for now.
              .s legend configure -mapped no
              # Instead use this.
              .s legend configure -hide yes

KEYWORDS

       stripchart, graph, widget