// Dropping particles
// Click the mouse to add obstacles
// Daniel Shiffman
// www.shiffman.net

// Nov 2006

// Our Particle Class
class Particle {
  float x;
  float y;
  float xspeed;
  float yspeed;
  float timer = 255;
  float r;

  Particle(float x_, float y_) {
    x = x_;
    y = y_;
    r = 4;

    float theta = random(PI,TWO_PI);
    float r = random(0.5,1);
    xspeed = r*cos(theta);
    yspeed = r*sin(theta);    
  }

  void run() {
    x = x + xspeed;
    y = y + yspeed;
    timer-=0.5;
  }

  void gravity() {
    yspeed += 0.05;
  }

  void hitObstacle(Obstacle obs) {
    if (obs.contains(x,y)) {
      yspeed *= -0.5;
      y += yspeed; // give it a little extra kick
    }
  }

  void render() {
    fill(255,timer);
    noStroke();
    ellipse(x,y,r,r);
  }

  boolean finished() {
    if (timer < 0) {
      return true; 
    } 
    else {
      return false;
    }
  }


}