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Aliased chessboard

Created with a variant of this program, which I (Loisel 03:56 Jan 24, 2003 (UTC)) wrote myself:

include <stdio.h>
include <stdlib.h>
include <math.h>
include <time.h>
include <assert.h>

int color(double x, double y) { double t,z; int i,j,k; x=x/128.0-0.5; y=y/1024.0; t=1.0/(y+0.01); z=t*x; i=floor(t); j=floor(z); k=i+j; // printf("%f %f -> %i %i %i\n",t,z,i,j,k%2); return ((k%2)!=0); } double myrand() { return rand()/((double)RAND_MAX); } int main() { int i,j,k,l; double x,y; printf("P5\n128 128\n255\n"); srand(time(0)); for(i=0;i<128;i++) for(j=0;j<128;j++) { k=0; for(l=0;l<255;l++) { x=j+myrand(); y=i+myrand(); k+=color(x,y); } assert(k>=0 && k<=255); k=(k/4)*4; // cygwin bug? fwrite(&k,1,1,stdout); } }

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