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### Re^2: GD vs. gnuplot

by SciDude (Friar)
 on Aug 10, 2004 at 02:01 UTC ( #381437=note: print w/replies, xml ) Need Help??

in reply to Re: GD vs. gnuplot

May I ask why you did not use Tk?

Recently for amusement I was looking for a simple way to plot geometrical shapes (polygons, regular solids, pyramids) in the form of a bzflag world map using perl. The thought experiment took me far and wide through various incantations of mesa, openGL/Perl, Glut, Perl SDL, and more. In the end I kept trying options and finding errors and horrible bugs eventually coming full circle (pun intended) back to Perl/Tk.

You may find some examples of interest using Tk:

1. TkGnuPlot
2. Data visualization using Perl/Tk
3. Some great examples at The Ultimate (well, not quite) Perl/Tk Page!!!
4. Graphing examples from The Perl Journal: Perl and the Tk Extension

Some code (corrected from non-working code found in Advanced Perl Programming) always makes a nice point:

```#!/usr/bin/perl -w

use Tk;
\$top = MainWindow->new();
\$canvas = \$top->Canvas(width => 600, height => 490)->pack();
# Draw a set of circles along an archimedean spiral
# The centers of these circles move along the spiral
# (radius of spiral = constant * theta)
```\$origin_x = 110; \$origin_y = 70;           # origin of the spiral
\$PI = 3.1415926535;
+e

for (\$angle = 0; \$angle <= 180;
{
# offset of path coordinates: r.cos() and r.sin()
# sin() and cos() like their angles in radians (degrees*/90)
\$path_x = \$origin_x + \$path_radius * cos (\$angle * \$PI / 90);
\$path_y = \$origin_y - \$path_radius * sin (\$angle * \$PI / 90);
# path_x and path_y are the coordinates of the center of the new
# circle. Canvas::create likes top-left and bottom-right corners
-fill => 'yellow' );
\$canvas->createLine ( \$origin_x, \$origin_y,
\$path_x, \$path_y,
-fill => 'slategray');

}

MainLoop();

SciDude
The first dog barks... all other dogs bark at the first dog.

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Re^3: GD vs. gnuplot
by johnnywang (Priest) on Aug 10, 2004 at 05:06 UTC
Thanks, SciDude. I'm not looking for an interactive program for which Tk would be a choice. I'd prefer no user interaction at all. All I want is to generate images (jpg,png) from some simple intuitive descriptions.

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