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Image:Aliased.png

Aliased chessboard

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

  1. include <stdio.h>
  2. include <stdlib.h>
  3. include <math.h>
  4. include <time.h>
  5. 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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