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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=name]   [color=string]   [--help]  [--verbose]  [--quiet]  [--ui]

           Coordinates are given in map units

           Print usage summary

           Verbose module output

           Quiet module output

           Force launching GUI dialog

           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. In this case, the user is presented with the standard GRASS GUI

       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.

       polygon     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.

       polyline     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

       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)


        d.font, d.labels, d.polar, d.text, d.where


       James Westervelt, U.S. Army Construction Engineering Research Laboratory

       Last changed: $Date: 2013-04-10 23:20:23 +0200 (Wed, 10 Apr 2013) $

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