/**
 * Pointillism
 * by Daniel Shiffman. 
 * 
 * Mouse horizontal location controls size of dots. 
 * Creates a simple pointillist effect using ellipses colored
 * according to pixels in an image. 
 */
 
PImage a;
int originX;
int originY;

void setup()
{
  a = loadImage("deadness.jpg");
  size(a.width,a.height);
  noStroke();
  background(255);
  smooth();
  originX = 0;
  originY = 0;
}

void draw()
{ 
  //reset it all to a new origin point
  if(mousePressed){
    originX = mouseX;
    originY = mouseY; 
    
    background(255);
  }
  
  pointilize();
  pointilize();
  pointilize();
  pointilize();
  pointilize();
 

}

void pointilize()
{
    //float pointillize = map(mouseX, 0, width, 2, 18);
  int x = int(random(a.width));
  int y = int(random(a.height));
  float distance = max((dist(x,y,originX, originY))/8,1);
  //color pix = a.get(x, y);
  //fill(pix, 126);
  drawCircle(x, y, distance);
}

void drawCircle(int x, int y, float radius)
{
  radius = ceil(radius);
  fill(getColorFromCircle(x,y,radius), 126);
  ellipse(x,y,radius,radius); 
  if(radius > 1){
    drawCircle(x, y, radius -1);
  }
}

color getColorFromCircle(int x, int y, float radius){
  //we want to get a point that is radius away from x,y
  //the new radius is actually rand()*(radius - floor(radius)) + floor(radius)
  
  radius = random(floor(radius-1), radius) + radius;
  
  //let's pic a random angle around the circle.
  int angle = floor(random(0,360));
  
  int newX = floor((cos(angle) * radius)) + x;
  int newY = floor((sin(angle) * radius)) + y; 
  return a.get(newX, newY);
  
  
}