// Cat Map on images

PImage a;
int index = 0;
int i = 0;
int lastx;
int lasty;
int iterx;
int itery;
  
void setup() 
{
  //a = loadImage("07.jpg");
  //size(a.width, 100);
  //size(374,474); 
  //size(299,196);
  framerate(30);
  //a = loadImage("black.jpg");
  //a = loadImage("DarwinL.jpg");
  a = loadImage("bacteria3.jpg");
  //a = loadImage("07.jpg");
  //a = loadImage("lizard72.jpg");
  //a = loadImage("test.jpg");
  size(720,480);
  //size(a.width*2,a.height*2);
  //size(720,480);
  background(140,130,143);
  smooth();
  noStroke();
  lastx = 1;
  lasty = 0;
}

void draw() 
{ 
  if(frameCount>=3000)
  {
   // return;
  }

 //saveFrame("darwinmap-####.tif"); 
 /* //random points
  int x = int(random(a.width));
  int y = int(random(a.height));
  color pix = a.pixels[x+y*a.width];
  fill(red(pix),green(pix),blue(pix),200); 
  ellipse(x,y,int(random(20))+6,int(random(20))+6);
 */
 // cat map square by square
 int x = (lastx+lasty)%720;
 int y = (lastx+2*lasty)%720;
 color pix = a.pixels[x+y*a.width];
 fill(red(pix),green(pix),blue(pix),200); 
 ellipse(x,y,7,7);
 //ellipse(x,y,int(random(20))+6,int(random(20))+6);
 lastx = x;
 lasty = y;
 if(frameCount%60 == 0)
 {
   //saveFrame("darwinmap-####.tif");
   iterx = iterx+1%720;
   lastx = iterx;
   if(iterx == 719)
   {  
     itery = itery+1%720;
     lasty = itery;
   }  
 }    
 if(frameCount%120 == 0)
 {
   //saveFrame("bacteriamap-####.tif");
 }      
  
}