1Ppmdraw User Manual(0) Ppmdraw User Manual(0)
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6 ppmdraw - draw lines, text, etc on a PPM image
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10 ppmdraw
11 { -script=script | -scriptfile=filename } [-verbose]
13 [ppmfile]
15 All options can be abbreviated to their shortest unique prefix. You
17 may use two hyphens instead of one to designate an option. You may use
18 either white space or an equals sign between an option name and its
19 value.
20
24 This program is part of Netpbm(1).
25 ppmdraw draws lines, shapes, text, etc. on a PPM image. It is essen‐
27 tially an easy-to-program front end to libnetpbm's 'ppmd' subroutines.
28 It lets you create a human-friendly script to describe the drawing
29 rather than write a C program.
30 You supply drawing instructions with a script, which you supply either
32 in a file named by a -scriptfile option or as the value of a -script
33 option. Here is an example script:
34 setpos 50 50;
36 text_here 10 30 'hello';
37 setcolor black;
38 text_here 10 0 'there';
39 line_here 5 20;
40 This example starts at Column 50, Row 50 of the input image and writes
42 the word 'hello' there in 10 pixel high white letters at a 30 degree
43 angle up from horizontal. Then, from where that leaves off, the script
44 writes 'there' in 10 pixel high black letters horizontally. Finally,
45 it draws a black line to a point 5 pixels over and 20 pixels down from
46 the end of 'there.'
47 If you don't specify ppmfile, ppmdraw reads its input PPM image from
49 Standard Input.
50 The output image goes to Standard Output.
52 ppmdraw works on multi-image streams. It executes the same script on
54 each input image and produces an output stream with one image for each
55 input image. But before Netpbm 10.32 (February 2006), ppmdraw ignored
56 every image after the first.
57 If you just want to add a single line of text to an image, ppmlabel may
59 be more what you want.
60
64 -script=script
65 This option gives the script. See Script ⟨#script⟩ .
66 You may not specify both -script and -scriptfile.
68 -scriptfile=filename
71 This option names a file that contains the script. - means
72 Standard Input.
73 You may not specify both -script and -scriptfile.
75 You may not specify - (Standard Input) for both -scriptfile and
77 the input image file.
78
84 The heart of ppmdraw function is its script. The script is a character
85 stream. The stream consists of commands. Commands are separated by
86 semicolons. White space is regarded just like in C: Any contiguous
87 stretch of unquoted white space is equivalent to a single space charac‐
88 ter. Note that this means newlines have no particular significance.
89 A command is composed of tokens, separated from each other by white
91 space. To write a token that contains white space, enclose it in dou‐
92 ble quotes. Everything between two matched quotation marks is one
93 token.
94 The first token of a command is the verb, which determines the basic
96 function of the command. The rest of the tokens of the command are
97 arguments, the meaning of which depends upon the verb. The following
98 list gives all the valid verbs, and for each its meaning and its argu‐
99 ments.
100 Many command have arguments that specify a position on the canvas,
102 which you specify by row and column. Row 0 is the top row. Column 0
103 is the leftmost column. You may specify negative numbers (but such a
104 position would necessarily be off the canvas).
105 Your drawing instructions may involve positions not on the canvas. But
107 any pixels you draw there just get discarded.
108 setpos Set the 'current position' in the image. This affects where
112 subsequent commands draw things. The 2 arguments are the column
113 and row number.
114 At the start of the script, the current position is (0,0).
116 setlinetype
119 The 1 argument is 'normal' or 'nodiag.'. This effects a
120 ppmd_setlinetype() call. Further details are not yet docu‐
121 mented.
122 setlineclip
125 This effects a ppmd_setlineclip() call. Not yet documented.
126 setcolor
129 This sets the 'current color', which determines the color in
130 which subsequent drawing commands draw. Before the first set‐
131 color, the current color is white.
132 setfont
135 This sets the 'current font', which determines the font in which
136 subsequent text drawing commands draw. Before the first set‐
137 font, the current color is a built in font called 'standard.'
138 The argument of this command is a file name. It is the name of
140 a Netpbm PPMD font file.
141 A Netpbm PPMD font file typically has a name that ends in
143 '.ppmdfont' and its first 8 bytes are the ASCII encoding of
144 'ppmdfont'.
145 There is only one of these fonts as far as we know. It is dis‐
147 tributed with Netpbm as the file standard.ppmdfont, but you
148 don't need to use that file because the same font is built into
149 the Netpbm library and is the default. If you want to make a
150 new font, you can find the format of a ppmdfont file in the
151 Netpbm interface header file ppmdfont.h, but you'll have to make
152 your own tools to build it.
153 line This draws a one pixel wide line in the current color. The 4
156 arguments are: starting column, starting row, ending column,
157 ending row.
158 This command does not affect the current position.
160 line_here
163 This is like line, except it works in a more relative way.
164 The line starts at the current point. The two arguments are the
166 rightward and downard displacement from there of the terminal
167 point. The command moves the current position to the terminal
168 point after drawing.
169 spline3
172 This draws a spline in the current color between 2 points, using
173 a third as a control point. It approximates a cubic spline seg‐
174 ment.
175 The shape of the curve is such that it passes through the speci‐
177 fied endpoints, and lines tangent to the curve at those end‐
178 points intersect at the control point. Controlling the tangents
179 allows you to connect this curve to other curves generated the
180 same way without having corners at the connection points.
181 The 6 arguments are the starting point column, starting point
183 row, control point column, control point row, ending point col‐
184 umn, and ending point row.
185 This command does not affect the current position.
187 circle This command draws a circle in the current color. The three
190 arguments are the column number and row number of the center of
191 the circle and the radius of the circle in pixels.
192 filledrectangle
195 This command draws a rectangle filled with the current color.
196 The 4 arguments are the column and row numbers of the upper left
198 corner of the rectangle, the width of the rectangle, and the
199 height of the rectangle.
200 text This command draws text in the current color in the built-in
203 font. The 5 arguments are:
204 · column number of starting point of baseline
208 · row number of starting point of baseline
210 · height of characters, in pixels
212 · angle of baseline in degrees elevated from the horizontal
214 · text
216 Note that if your text contains white space, you'll have to use
219 double quotes to cause it to be a single token.
220 text_here
223 This is like text, except that the baseline starts at the cur‐
224 rent position and the command updates the current position to
225 the other end of the baseline after it draws.
226 Bear in mind that a script starts with the current position in
228 the top line, so if you leave it there, only the bottom line of
229 your text will be within the image!
230
235 ppmdraw was new in Netpbm 10.29 (August 2005).
236
240 ppmlabel(1), ppm(1)
241netpbm documentation 22 June 2005 Ppmdraw User Manual(0)