マウスをノイズのある円で追いかける

/**
* Tracing of Mouse By Unstable Circles
*
* @author aa_debdeb
* @date 2015/09/17
*/

int MAX_CIRCLE_NUM = 100;
float RADIOUS = 100;
float RADIOUS_VARIANT_SIZE = 20;
float POSITION_VARIANT_SIZE = 20;

ArrayList<Circle> circles;

void setup(){
  size(500, 500);
  smooth();
  background(0);
  frameRate(30);
  
  circles = new ArrayList<Circle>();
}

void draw(){
  background(255);
  circles.add(new Circle());
  if(circles.size() == MAX_CIRCLE_NUM){
    circles.remove(0);
  }  
  
  for(Circle circle: circles){
    circle.draw();
  }
}


class Circle{
  
  float x;
  float y;
  float xRadious;
  float yRadious;
  
  Circle(){
    x = mouseX + (2.0 * random(POSITION_VARIANT_SIZE) - POSITION_VARIANT_SIZE);
    y = mouseY + (2.0 * random(POSITION_VARIANT_SIZE) - POSITION_VARIANT_SIZE);
    xRadious = RADIOUS + (2.0 * random(RADIOUS_VARIANT_SIZE) - RADIOUS_VARIANT_SIZE);
    yRadious = RADIOUS + (2.0 * random(RADIOUS_VARIANT_SIZE) - RADIOUS_VARIANT_SIZE);

  }
  
  void draw(){
    stroke(0);
    strokeWeight(0.5);
    noFill();
    arc(x, y, xRadious * 2, yRadious * 2, 0, PI * 2);
  }
  
}