// loads an binary image and convert it to dots
// Author: Baris Evrim Demiroz b.evrim[at]gmail.com

PImage src,dst;
int wSize=7;  //window size, should be even
float t=0.5;  //threshold value for window fill ratio
int total;
int i,j,k,m;
color c = color(90,90,180);

void setup(){
  size(450,223);
  src = loadImage("dunya.gif");
  smooth();
  fill(c);
  stroke(c);
  framerate(10);
  loop();
}

void draw(){
  if(mousePressed){
    image(src,0,0);
  }
  else{
    background(50);
    for(i=0; i<height; i+=wSize){
      for(j=0; j<width; j+=wSize){
        total = 0;
        for(k=0; k<wSize; k++){
          for(m=0; m<wSize; m++){
            if(i*width+k+j+m < width*height){
              if(src.pixels[i*width+k+j+m] != #000000 )
              total++;
            }
          }
        }
        if( (float)total/(wSize*wSize) >= t )
          ellipse(j+wSize/2, i+wSize/2, wSize/2, wSize/2);
      }
    }
  }
}