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       d.graph  - Program for generating and displaying simple graphics on the display monitor.


       display, cartography


       d.graph help
       d.graph [-m]  [input=string]   [color=string]   [--verbose]  [--quiet]

           Coordinates are given in map units

           Verbose module output

           Quiet module output

           Name of file containing graphics commands, if not given reads from standard input

           Color to draw with, either a standard GRASS color or R:G:B triplet
           Default: black


       d.graph  draws graphics that are described either from standard input (default), or within
       a file (if an input file name is identified on the command line). If graphics commands are
       entered  from  standard  input,  a  CTRL-d  is used to signal the end of input to d.graph.
       Coordinates are given either as a percentage of frame height and  width  (default)  or  in
       geographic coordinates (with the -m flag).

       The  program  can be run interactively or non-interactively.  The user can run the program
       completely non-interactively by specifying the name of  a  graphics  file  containing  the
       d.graph  graphics  commands.  If run non-interactively the d.graph command is saved to the
       display's dedraw  history.   The  user  can  also  elect  to  run  the  program  partially
       interactively, by specifying any/all of the parameters except the graphics file input=name
       parameter on the command line.  In this case,  d.graph  will  expect  the  user  to  input
       d.graph  graphics  commands  from  standard input (i.e., the keyboard) and will (silently)
       prompt the user for these graphics commands.

       Alternately, the user can simply type d.graph on the command line, and be prompted for the
       values of all parameters GRASS GUI interface.

       The default coordinate system used is 0-100 percent of the active frame in x and similarly
       0-100 in y, regardless of the graphics monitor display frame size and aspect.   The  (0,0)
       location is the lower left corner of the active graphics monitor display frame. All values
       may be floating point.  If the -m flag is  given,  geographic  coordinates  will  be  used


       The graphics language is simple, and uses the following commands:
       [  # | move | draw | polygon | polyline | color | text | size | symbol | rotation | icon |
       width ]

       # comment
              A line of comment which is ignored in the processing.

       move xpos ypos
              The current location is updated to xpos ypos.  Unless the -m flag is  used,  values
              are  stated  as  a  percent  of  the  active  display frame's horizontal (xpos) and
              vertical (ypos) size, and may be floating point values. Values are  between  0-100.
              Note. A space must separate xpos and ypos.

       draw xpos ypos
              A  line is drawn in the current color from the current location to the new location
              xpos ypos, which then becomes the current location.  Unless the -m  flag  is  used,
              values  are stated as a percent of the active display frame's horizontal (xpos) and
              vertical (ypos) size, and may be floating point values. Values are  between  0-100.
              Note. A space must separate xpos and ypos.

                 xpos ypos
                 xpos ypos
              The coordinates appearing beneath the word polygon, one pair per line, circumscribe
              a polygon that is to be filled with the current color.

                 xpos ypos
                 xpos ypos
              The  coordinates  appearing  beneath  the  word  polyline,  one  pair   per   line,
              circumscribe a polygon that is not to be filled with color.

       color color
              Sets  the  current  color  to that stated; subsequent graphics will be drawn in the
              stated color, until the current color is set to a  different  color.   Options  are
              red,  orange,  yellow,  green,  blue,  indigo, violet, brown, magenta, gray, white,
              black, an R:G:B triplet (separated by colons), or the word  "none"  (draws  in  the
              default background color).

       text line-of-text
              The  stated  text is drawn at the current location using the current color, and the
              new current location is then positioned at the end of the text string.

       size xper yper
              Subsequent text will be drawn such that the text is xper percent  of  the  graphics
              monitor display frame wide and yper percent of the frame high. By default, the text
              size is set to 5 percent of the active frame's width and 5 percent of  the  frame's
              height.   If only one value is given, then that value will be used for both x and y
              Note. A space must separate xper and yper.

       symbol type size xper yper [line_color [fill_color]]
              A symbol is drawn at the given size on the  display  monitor.  The  xper  and  yper
              options  define the center of the icon and are given as a percentage of the display
              frame  (0,0  is  lower  left).   The  symbol  can  be  any  of  those   stored   in
              $GISBASE/etc/symbol/  (e.g.  basic/circle) or stored in the user's mapset directory
              in the form $MAPSET/symbol/type/name.  The colors may be either  a  standard  color
              name,  an R:G:B triplet, or "none". If using an R:G:B triplet, each color value can
              range from 0-255.  If not specified the default line_color is black and the default
              fill_color is grey.

       rotation angle
              Subsequent  text and symbols will be drawn such that they are rotated angle degrees
              counter-clockwise from east.

       icon type size x y
              Draws an icon of types o, x, or + with specified  size  (in  %)  at  location  x,y.
              Note: type o designates a square.

       width value
              Subsequent  lines  (including non-FreeType text) will be drawn with the given pixel
              The default value is 0.


       For an example use of d.graph, examine the contents of  the  command  file  grass_logo.txt
       located  in  the d.graph source code directory. It will draw the CERL GRASS logo using the
       d.graph graphing  commands  stored  in  the  file.   Note  that  the  coordinates  in  the
       grass_logo.txt file were taken directly off an image drawn by hand on graph paper.

       A dynamic example can be found in the d.polar shell script.

   Draw a star symbol at a given map coordinate

       echo "symbol basic/star 20 2264417 5413182 black red" | d.graph -m

   Split the screen into quadrants:

       d.frame -s full_screen
       d.graph << EOF
         color 80:80:120
          0 49.75
          0 50.25
          100 50.25
          100 49.75
          49.85 0
          50.15 0
          50.15 100
          49.85 100


       d.graph remembers the last screen location (xpos ypos) to which the user moved, even after
       the user erases the display frame.  If the user runs d.graph  repeatedly,  and  wishes  to
       start anew with the default (xpos ypos) screen location, the user should clear the display
       frame between runs of d.graph.


       There are no automated ways of generating graphic images. It  is  anticipated  that  GRASS
       user  sites  will  write  programs  to convert output from a resident graphics editor into
       GRASS d.graph format.  (e.g. EPS -> d.graph, perhaps with the help of a pstoedit plugin)




       James Westervelt, U.S. Army Construction Engineering Research Laboratory
       Last changed: $Date: 2010-09-16 09:25:59 +0200 (Thu, 16 Sep 2010) $

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