Image:Antialiased.png
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antialiased chessboard
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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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