BackG backG;
Circle[] circle = new Circle[20];


class BackG {
  int i = 0;
  BackG() {
    for (int n = 0;n<20;n++) circle[n] = new Circle();
  }

  void display() {
    noStroke();
    fill(#81f7f3);
    rect(width/2, height/2, width, height);
    if (i >= 19) i = 0;
    for (int n = 0;n<20;n++) circle[n].display();
  }

  void mouseReleased() {
    circle[i].isMove = true;
    circle[i].x = mouseX;
    circle[i].y = mouseY;
    circle[i].dx = 0;
    circle[i].dy = 0;
    i++;
  }
}


class Circle {
  float x = width/2, y = height/2;
  float dx = 0, dy = 0;
  boolean isMove = false;
  float clear = 255;

  void display() {
    if (isMove) {
      noFill();
      stroke(#E0F8F1,clear);
      strokeWeight(10);
      ellipse(x, y, dx, dy);
      dx+= width*0.005;
      dy+= width*0.005;
      clear -=0.8;
      if (dy >height*2.5 || clear < 0){
        isMove = false;
        clear = 255;
      }
    }
  }
}