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GL3.2 for AIX: Graphics Library (GL) Technical Reference
sunflower.c Example C Language Program
/*
sunflower.c
Make a sunflower-like pattern out of circles.
Usage: sunflower <<nseeds> <<seedsize> <<growth>
Try "sunflower 400.05 1.1"
Paul Haeberli - 1984
*/
#include <gl/gl.h>
#include <gl/device.h>
#include <stdio.h>
#include <math.h>
int seeds = 0;
main(argc,argv)
int argc;
char **argv;
{
int nseeds;
float seedsize, grow;
short val;
if (argc<4) {
fprintf(stderr,
"Usage: sunflower <nseeds> <seedsize> <growth>\n");
exit(1);
}
nseeds = atoi(argv[1]);
seedsize = atof(argv[2]);
grow = atof(argv[3]);
prefposition(XMAXSCREEN/4,XMAXSCREEN*3/4,YMAXSCREEN/4,
YMAXSCREEN*3/4);
winopen("sunflower");
singlebuffer();
zbuffer (FALSE);
cmode();
gconfig ();
makeframe();
sunflower(nseeds,seedsize,grow);
while (1) {
if (qread(&val) == REDRAW) {
makeframe();
sunflower(nseeds,seedsize,grow);
}
}
}
sunflower(nseeds,seedsize,grow)
int nseeds;
float seedsize, grow;
{
float rad = 20.0;
int parity = 0;
scale(10.0,10.0,0.0);
pushmatrix();
while (rad < 100.0) {
rotate(1800/nseeds,'z');
scale(grow,grow,0.0);
makering(nseeds,seedsize);
rad = rad * grow;
}
popmatrix();
}
makering(nseeds,seedsize)
int nseeds;
float seedsize;
{
int i;
for (i=0; i<nseeds; i++) {
pushmatrix();
rotate((i*3600)/nseeds,'z');
drawseed(seedsize);
popmatrix();
}
}
drawseed(seedsize)
float seedsize;
{
seeds++;
circ(1.0,0.0,seedsize);
}
makeframe()
{
int xsize, ysize;
float aspect;
reshapeviewport();
getsize(&xsize,&ysize);
color(7);
clear();
color(0);
aspect = xsize/(float)ysize;
ortho2(-50.0,50.0,-50.0/aspect,50.0/aspect);
}
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