​

// Define the class Ball. This is essentially a blueprint.

class Ball {

  constructor(x, y, w) { //constructors are passed in when applying this class

    this.x = x; // x location of ball 

    this.y = y; // y location of ball

    this.w = w; // size of ball

    this.speed = 0; // speed

    this.fill = 0;

  }

​

    // automatically is a function as it is defined in a class

  display() {

    // Display the ellipse

    noStroke();

    ellipse(this.x, this.y, this.w, this.w);

  }

​

  update() {

    // Add speed to location

    this.y = this.y + this.speed;

​

    // Add gravity to speed

    this.speed = this.speed + gravity;

​

    // If square reaches the bottom 

    // Reverse speed by multiplying by a negative #

    if (this.y > height) {

      this.speed = this.speed * -0.95;

    }

  }

}

​