int blocks=1;
int multiplier=4;

float [] radii;

void setup()
{
  size(150,150);
  colorMode(HSB, 255);
  background(255);
  //func(0,0,width,height);

  radii = new float[width*height];

  for (int y=0;y<height;y++)
  {
    for (int x=0;x<width;x++)
    {
      float dist = sqrt(sq(x-width/2)+sq(y-height/2)) / (float)(width/2);
      if (dist<0.0f) dist=0.0f;
      if (dist>1.0f) dist=1.0f;
      radii[x+(y*width)]=dist*dist;
    }
  }

  cursor(CROSS);
}

void keyPressed()
{
  if (key=='2') multiplier=2;
  if (key=='3') multiplier=3;
  if (key=='4') multiplier=4;
}

void loop()
{
  //  func(0,0,width,height);
  //func((int)(random(1.0f)*width),(int)(random(1.0f)*width),30,30);
  background(255);//255);

  int sections=1,sectionSize;
  float mox,moy;
  for (sections=1;sections<12;sections*=multiplier)
  {
    sectionSize=width/sections;
    mox = (float)(mouseX-(width/2))/10.0f;
    moy = (float)(mouseY-(height/2))/10.0f;
    for (int y=0;y<sections;y++)
    {
      for (int x=0;x<sections;x++)
      {
        func(x*sectionSize+(int)(mox*sections),y*sectionSize+(int)(moy*sections),sectionSize,sectionSize);
      }
    }
  }
}

void func(int x, int y, int w, int h)
{
  if (w<5) return;
  int cx=(w/2),cy=(h/2);
  float dist=0.0f;
  color sourceColour;
  color destColour;
  float sourceBrightness;
  float destBrightness;
  int m=width/w;
  for (int yy=0;yy<h;yy++)
  {
    for (int xx=0;xx<h;xx++)
    {
      //dist = sqrt(sq(xx-cx)+sq(yy-cy)) / (float)cx;
      //if (dist<0.0f) dist=0.0f;
      //if (dist>1.0f) dist=1.0f;
      dist = radii[(xx*m)+(width*(yy*m))];
      sourceColour = get(x+xx,y+yy);

      sourceBrightness = brightness(sourceColour);
      //sourceBrightness = hue(sourceColour);

      destBrightness = ((dist)*sourceBrightness)+((1.0f-dist)*(255.0f-sourceBrightness));

      destColour = color(0,0,destBrightness);
      //destColour = color(destBrightness,255,255);

      set(x+xx,y+yy,destColour);
    }
  }

}