Ball[] balls = new Ball[1];

float colVar_r = 0;
float colVar_g = 0;
float colVar_b = 0;

float gravity = 0.1;
float w;

void setup(){
  size(400, 300);
  smooth();
  frameRate(30);
  //initialise balls
    balls[0] = new Ball(50,0,16);
}

void draw(){
  background(209);
  //move and display stripes
  for(int i = 0; i < balls.length; i++){
    balls[i].gravity();
    balls[i].move();
    balls[i].display();
  }
}

void mousePressed(){
  //new ball object
  Ball b = new Ball(mouseX, mouseY, w);
  //append to array
  balls = (Ball[]) append(balls,b);
}



class Ball{
  float x;
  float y;
  float speed;
  float w;
  
  Ball(float tempX, float tempY, float tempW){
    x = tempX;
    y = tempY;
    //w = tempW;
    speed = 0;
    w = random(10,40);

  }
  
  void gravity(){
    speed = speed + gravity;
  }
  
  
  void move(){
    y = y + speed;
    //if ball reaches bottom, reverse speed
    if(y > height){
      speed = speed * -0.95;
      y = height;
    }
  }
  
  //draw stripe
  void display(){
    //show circle
     colVar_r = random(255);
     colVar_g = random(255);
     colVar_b = random(255);

     fill(colVar_r,colVar_g,colVar_b);
      noStroke();
      ellipse(x,y,w,w);
  }
}