final float acceleration = 0.98; //acceleration due to gravity.
int numBalls = 0; // global var to keep track of how many balls are on the screen.
 
//initializing the balls to move around.
Ball ball1[100];
//Definition of what a "Ball" actually is.
class Ball {
  float r;
  float x,y;
  float vx,vy;
  float direction;
 
  Ball(float p1, float p2, float p3, float p4, float p5, float p6){ // constructor
    r = p1;
    x = p2;
    y = p3;
    vx = p4;
    vy = p5;
    direction = p6;
  }
}

void setup(){
  size(400,400);
  smooth();

}

void draw(){
  background(255,255,255);
  numBalls++;
  if (numBalls >= ball1.length){
   numBalls = 0;} //start array over
//Draw and move the balls
  for (int i=0;i<numBalls;i++){
    ball1[i].drawBall();
    ball1[i].moveBall();
    }
}

void mousePressed(){
  ball1[numBalls] = new Ball (25, mouseX, 0, 0, 0, -1);
      
}

void drawBall(Ball aBall){
  fill(33,232,23);
  ellipse(aBall.x, aBall.y, aBall.r, aBall.r);
  }
 
void moveBall(Ball aBall){
  aBall.vy += acceleration;
  aBall.y += aBall.vy;
  if(aBall.y > height - 2.5){
    aBall.vy *= aBall.direction;}  
}