dos33fsprogs/gr-sim/rainbow.c

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "gr-sim.h"
int main(int argc, char **argv) {
int x,y,ch;
grsim_init();
gr();
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/* Put rainbow on screen */
for(y=0;y<40;y++) for(x=0;x<40;x++) {
color_equals(y%16);
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basic_plot(x,y);
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}
color_equals(15);
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basic_vlin(0,40,20);
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color_equals(0);
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basic_hlin(0,40,20);
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while(1) {
grsim_update();
ch=grsim_input();
if (ch=='q') break;
usleep(100000);
}
return 0;
}