File:Schachbrett-bw.png

/*
[[:File:XOR_texture.png]]

*/


#include <fstream>





// http://fraktal.republika.pl/grid.html
int f( int x, int y, int Width){

 
  int g;
  int bx = (x / Width) % 2; // check if odd
  int by = (y / Width) % 2;

 if (bx == by ) 
    g= 0; 
    else g= 255;
    
 return g;
}





int main()
{
        const int side = 445; 
   int xMax = side;
int yMax = side;

int rows = 5; 
        int width = side / rows;    
        
	std::ofstream file;
	file.open("checkerboard.ppm");
	file << "P2" << xMax << ' ' <<  yMax << ' ' << " 255\n";
	for (int x = 0; x < xMax; x++)
		for (int y = 0; y < yMax; y++)
			file << f(x,y, width) << ' ';
	file.close();
	return 0;
}