// Daniel Shiffman

// http://natureofcode.com

​

class CannonBall {

​

  constructor(x, y) {

    this.position = new createVector(x, y);

    this.velocity = new createVector();

    this.acceleration = new createVector();

    this.r = 8;

    this.topspeed = 10;

  }

​

  // Standard Euler integration

   update() {

    this.velocity.add(this.acceleration);

    this.velocity.limit(this.topspeed);

    this.position.add(this.velocity);

    this.acceleration.mult(0);

  }

​

   applyForce(force) {

    this.acceleration.add(force);

  }

​

​

   display() {

    stroke(0);

    strokeWeight(2);

    push();

    translate(this.position.x, this.position.y);

    ellipse(0, 0, this.r * 2, this.r * 2);

    pop();

  }

}