Ball ball;
Ball blueBall;
Ball greenBall;

void setup() {
  size(200, 200);
  smooth();
  
  ball = new Ball();
  ball.x = random(width);
  ball.y = random(height);
  ball.s = random(20, 50);
  ball.col = color(255, 0, 0);
  
  blueBall = new Ball();
  blueBall.x = random(width);
  blueBall.y = random(height);
  blueBall.s = random(20, 50);
  blueBall.col = color(0, 0, 255);
  
  greenBall = new Ball();
  greenBall.x = random(width);
  greenBall.y = random(height);
  greenBall.s = random(20, 50);
  greenBall.col = color(0, 255, 0);
}

void draw() {
  background(220);
  
  ball.x = mouseX;
  ball.y = mouseY;
  ball.drawShape();
  
  blueBall.drawShape();
  greenBall.drawShape();
}


class Ball {
  
  // Eigenschaften
  float x;
  float y;
  color col;
  float s;

  // Methode
  void drawShape() {
    fill(col);
    ellipse(x, y, s, s);
  }

}