a4dd3af1c6
git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@5032 626c5289-ae23-0410-ae9c-e8d60b6d4f22
68 lines
1.6 KiB
Perl
68 lines
1.6 KiB
Perl
# Plot a 3D function
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use gifplot;
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package gifplot;
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# Here is the function to plot
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sub func {
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my $x = shift;
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my $y = shift;
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return 5*cos(2*sqrt($x*$x+$y*$y))*exp(-0.3*sqrt($x*$x+$y*$y));
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}
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# Here are some plotting parameters
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$xmin = -5.0;
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$xmax = 5.0;
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$ymin = -5.0;
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$ymax = 5.0;
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$zmin = -5.0;
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$zmax = 5.0;
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# Grid resolution
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$nxpoints = 60;
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$nypoints = 60;
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$cmap = new_ColorMap("cmap");
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$frame = new_FrameBuffer(500,500);
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FrameBuffer_clear($frame,$BLACK);
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$p3 = new_Plot3D($frame,$xmin,$ymin,$zmin,$xmax,$ymax,$zmax);
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Plot3D_lookat($p3,2*($zmax-$zmin));
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Plot3D_autoperspective($p3,40);
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Plot3D_rotu($p3,60);
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Plot3D_rotr($p3,30);
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Plot3D_rotd($p3,10);
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sub drawsolid {
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Plot3D_clear($p3,$BLACK);
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Plot3D_start($p3);
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my $dx = 1.0*($xmax-$xmin)/$nxpoints;
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my $dy = 1.0*($ymax-$ymin)/$nypoints;
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my $cscale = 240.0/($zmax-$zmin);
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my $x = $xmin;
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for ($i = 0; $i < $nxpoints; $i++) {
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my $y = $ymin;
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for ($j = 0; $j < $nypoints; $j++) {
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my $z1 = func($x,$y);
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my $z2 = func($x+$dx,$y);
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my $z3 = func($x+$dx,$y+$dy);
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my $z4 = func($x,$y+$dy);
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my $c1 = $cscale*($z1-$zmin);
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my $c2 = $cscale*($z2-$zmin);
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my $c3 = $cscale*($z3-$zmin);
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my $c4 = $cscale*($z4-$zmin);
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my $c = ($c1+$c2+$c3+$c4)/4;
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if ($c < 0) { $c = 0; }
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if ($c > 239) { $c = 239; }
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Plot3D_solidquad($p3,$x,$y,$z1,$x+$dx,$y,$z2,$x+$dx,$y+$dy,$z3,$x,$y+$dy,$z4,$c+16);
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$y = $y + $dy;
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}
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$x = $x + $dx;
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}
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}
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print "Making a nice 3D plot...\n";
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drawsolid();
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FrameBuffer_writeGIF($frame,$cmap,"image.gif");
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print "Wrote image.gif\n";
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