円でマウスを追いかける

/**
* Mouse Followers
*
* @author aa_debdeb
* @date 2016/01/18
*/

ArrayList<PVector> pastMouses;

void setup(){
  size(500, 500);
  smooth();
  frameRate(30);
  
  pastMouses = new ArrayList<PVector>();
}

void draw(){
  background(128, 11, 35);
  stroke(230, 195, 0);
  strokeWeight(2);
  fill(255, 15);
  pastMouses.add(new PVector(mouseX, mouseY));
  for(int i = 0; i < pastMouses.size(); i++){
    PVector mouse = pastMouses.get(i);
    float diameter = map(sq(i), 0, 10000, 1, 200);
    ellipse(mouse.x, mouse.y, diameter, diameter);
  }
  
  if(pastMouses.size() >= 100){
    pastMouses.remove(0);
  }
}