// Pixel Array 
// by REAS <http://reas.com> 

PImage a; 
int[] aPixels; 
int direction = 1; 
boolean onetime = true; 
float signal; 
 
void setup() 
{ 
  size(200, 200); 
  aPixels = new int[width*height]; 
  noFill(); 
  stroke(255); 
  framerate(30); 
  a = loadImage("ystone08.jpg"); 
  for(int i=0; i<width*height; i++) { 
    aPixels[i] = a.pixels[i]; 
  } 
} 
 
void draw() 
{ 
  if (signal > width*height-1 || signal < 0) { 
    direction = direction * -1; 
  } 
 
  if(mousePressed) { 
    if(mouseY > height-1) { mouseY = height-1; } 
    if(mouseY < 0) { mouseY = 0; } 
    signal = mouseY*width+mouseX; 
  } else { 
    signal += (0.33*direction);  
  } 
  
  if(keyPressed) { 
    loadPixels(); 
    for (int i=0; i<width*height; i++) { 
      pixels[i] = aPixels[i];  
    } 
    updatePixels(); 
    rect(signal%width-5, int(signal/width)-5, 10, 10); 
    point(signal%width, int(signal/width)); 
  } else { 
    loadPixels(); 
    for (int i=0; i<width*height; i++) { 
      pixels[i] = aPixels[int(signal)]; 
    } 
    updatePixels(); 
  } 
}