1d.graph(1) Grass User's Manual d.graph(1)
2
6 d.graph - Program for generating and displaying simple graphics on the
7 display monitor.
8
10 display
11
13 d.graph
14 d.graph help
15 d.graph [-m] [input=string] [color=string]
16 Flags:
18 -m Coordinates are given in map units
19 Parameters:
21 input=string
22 Name of file containing graphics commands, if not given reads from
23 standard input
24 color=string
26 Color to draw with, either a standard GRASS color or R:G:B triplet
27 Default: black
28
30 d.graph draws graphics that are described either from standard input
31 (default), or within a file (if an input file name is identified on the
32 command line). If graphics commands are entered from standard input, a
33 CTRL-d is used to signal the end of input to d.graph. Coordinates are
34 given either as a percentage of frame height and width (default) or in
35 geographic coordinates (with the -m flag).
36 The program can be run interactively or non-interactively. The user
38 can run the program completely non-interactively by specifying the name
39 of a graphics file containing the d.graph graphics commands. If run
40 non-interactively the d.graph command is saved to the display's dedraw
41 history. The user can also elect to run the program partially interac‐
42 tively, by specifying any/all of the parameters except the graphics
43 file input=name parameter on the command line. In this case, d.graph
44 will expect the user to input d.graph graphics commands from standard
45 input (i.e., the keyboard) and will (silently) prompt the user for
46 these graphics commands.
47 Alternately, the user can simply type d.graph on the command line, and
49 be prompted for the values of all parameters GRASS GUI interface.
50 The default coordinate system used is 0-100 percent of the active frame
52 in x and similarly 0-100 in y, regardless of the graphics monitor dis‐
53 play frame size and aspect. The (0,0) location is the lower left cor‐
54 ner of the active graphics monitor display frame. All values may be
55 floating point. If the -m flag is given, geographic coordinates will
56 be used instead.
57
59 The graphics language is simple, and uses the following commands:
60 [ # | move | draw | polygon | polyline | color | text | size | symbol |
61 rotation | icon | width ]
62 # comment
64 A line of comment which is ignored in the processing.
65 move xpos ypos
67 The current location is updated to xpos ypos. Unless the -m
68 flag is used, values are stated as a percent of the active dis‐
69 play frame's horizontal (xpos) and vertical (ypos) size, and may
70 be floating point values. Values are between 0-100. Note. A
71 space must separate xpos and ypos.
72 draw xpos ypos
74 A line is drawn in the current color from the current location
75 to the new location xpos ypos, which then becomes the current
76 location. Unless the -m flag is used, values are stated as a
77 percent of the active display frame's horizontal (xpos) and ver‐
78 tical (ypos) size, and may be floating point values. Values are
79 between 0-100. Note. A space must separate xpos and ypos.
80 polygon
82 xpos ypos
83 xpos ypos
84 ... The coordinates appearing beneath the word polygon, one
85 pair per line, circumscribe a polygon that is to be filled with
86 the current color.
87 polyline
89 xpos ypos
90 xpos ypos
91 ... The coordinates appearing beneath the word polyline, one
92 pair per line, circumscribe a polygon that is not to be filled
93 with color.
94 color color
96 Sets the current color to that stated; subsequent graphics will
97 be drawn in the stated color, until the current color is set to
98 a different color. Options are red, orange, yellow, green,
99 blue, indigo, violet, brown, magenta, gray, white, black, an
100 R:G:B triplet (separated by colons), or the word "none" (draws
101 in the default background color).
102 text line-of-text
104 The stated text is drawn at the current location using the cur‐
105 rent color, and the new current location is then positioned at
106 the end of the text string.
107 size xper yper
109 Subsequent text will be drawn such that the text is xper percent
110 of the graphics monitor display frame wide and yper percent of
111 the frame high. By default, the text size is set to 5 percent of
112 the active frame's width and 5 percent of the frame's height.
113 If only one value is given, then that value will be used for
114 both x and y scaling.
115 Note. A space must separate xper and yper.
116 symbol type size xper yper line_color fill_color
118 A symbol is drawn at the given size on the display monitor. The
119 xper and yper options define the center of the icon and are
120 given as a percentage of the display frame (0,0 is lower left).
121 The symbol can be any of those stored in $GISBASE/etc/symbol/
122 (e.g. basic/circle) or stored in the user's mapset directory in
123 the form $MAPSET/symbol/type/name. The colors may be either a
124 standard color name, an R:G:B triplet, or "none". If using an
125 R:G:B triplet, each color value can range from 0-255.
126 rotation angle
128 Subsequent text will be drawn such that the text is rotated
129 angle degrees counter-clockwise from east.
130 icon type size x y
132 Draws an icon of types o, x, or + with specified size (in %) at
133 location x,y. Note: type o designates a square.
134 width value
136 Subsequent lines (including non-FreeType text) will be drawn
137 with the given pixel thickness.
138 The default value is 0.
139
141 For an example use of d.graph, examine the contents of the command file
142 grass_logo.txt located in the d.graph source code directory. It will
143 draw the CERL GRASS logo using the d.graph graphing commands stored in
144 the file. Note that the coordinates in the grass_logo.txt file were
145 taken directly off an image drawn by hand on graph paper.
146 A dynamic example can be found in the d.polar shell script.
148 Draw a star symbol at a given map coordinate
150 echo "symbol basic/star 20 2264417 5413182 black red" | d.graph -m
152 Split the screen into quadrants:
155 d.frame -s full_screen
157 d.graph << EOF
158 color 80:80:120
159 polygon
160 0 49.75
161 0 50.25
162 100 50.25
163 100 49.75
164 polygon
165 49.85 0
166 50.15 0
167 50.15 100
168 49.85 100
169 EOF
170
173 d.graph remembers the last screen location (xpos ypos) to which the
174 user moved, even after the user erases the display frame. If the user
175 runs d.graph repeatedly, and wishes to start anew with the default
176 (xpos ypos) screen location, the user should clear the display frame
177 between runs of d.graph.
178
180 There are no automated ways of generating graphic images. It is antici‐
181 pated that GRASS user sites will write programs to convert output from
182 a resident graphics editor into GRASS d.graph format. (e.g. EPS ->
183 d.graph)
184
186 d.font
187 d.font.freetype
188 d.frame
189 d.labels
190 d.polar
191 d.text
192 d.text.freetype
193 d.where
194
196 James Westervelt, U.S. Army Construction Engineering Research Labora‐
197 tory
198 Last changed: $Date: 2006/09/13 13:41:48 $
199 Full index
201GRASS 6.2.2 d.graph(1)