Image:Antialiased.png

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Antialiased.png‎ (128 × 128 pixel, file size: 11 KB, MIME type: image/png)

antialiased chessboard

GFDL

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
Subject to disclaimers.


generated by this code, which I (Loisel 03:57 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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