/*

Circles
-------
This script draws a bunch of colored circles to 
form a tileable texture.

Author:  Andreas Jonsson
Created: April 23rd, 2003
Updated: July 28th, 2005

Texture Generator version 1.1.0

*/

randomizer rnd;

void circle(image @img, int cx, int cy, int r, int thickness, float red, float green, float blue)
{
  int w = img.width;
  int h = img.height;

  int x, y, count;
 
  count = r + thickness;
  if( cx - count < 0 ) cx = cx + w;
  if( cy - count < 0 ) cy = cy + h;
  
  x = 0;
  while( x <= count )
  {
    y = 0;
    while( y <= count )
    {
      int pr = int(sqrt(float(x*x + y*y)));
      if( (pr < r + thickness/2) and (pr >= r - thickness/2) )
      {
         int px, py;
      	 px = (cx+x)%w;
      	 py = (cy+y)%h;
	 img.Pixel(px, py) = pixel(red, green, blue);

      	 px = (cx-x)%w;
      	 py = (cy+y)%h;
      	 img.Pixel(px, py) = pixel(red, green, blue);

      	 px = (cx-x)%w;
      	 py = (cy-y)%h;
      	 img.Pixel(px, py) = pixel(red, green, blue);

      	 px = (cx+x)%w;
      	 py = (cy-y)%h;
      	 img.Pixel(px, py) = pixel(red, green, blue);
      }

      y++;
    }
    x++;
  } 
}

void main()
{
  int m = 4;

  image @img = @image(m*256, m*256);

  int n = 0;
  while( n++ < 20 )
  {
    circle(@img, m*int(256.0*rnd.getNumber()), m*int(256.0*rnd.getNumber()), m*int(20.0*rnd.getNumber())+10, m*int(10.0*rnd.getNumber())+1, rnd.getNumber(), rnd.getNumber(), rnd.getNumber());    
  }
 
  img.Resize(256, 256);
 
  img.Show();
}