​

// The Nature of Code

// Daniel Shiffman

// http://natureofcode.com

​

class Mover{

  constructor(){

    this.position = createVector(width/2,height/2);

    this.velocity = createVector();

    this.acceleration = createVector();

    this.topSpeed = 5;

  }

​

  update() {

    // The random2D() function returns a unit vector pointing in a random direction.

    this.acceleration = p5.Vector.random2D();

    this.acceleration.mult(random(2));

​

    this.velocity.add(this.acceleration);

    this.velocity.limit(this.topSpeed);

    this.position.add(this.velocity);

  }

​

  show() {

    stroke(0);

    strokeWeight(2);

    fill(127);

    circle(this.position.x, this.position.y, 48);

  }

​

  checkEdges() {

​

    if (this.position.x > width) {

      this.position.x = 0;

    }

    else if (this.position.x < 0) {

      this.position.x = width;

    }

​

    if (this.position.y > height) {

      this.position.y = 0;

    }

    else if (this.position.y < 0) {

      this.position.y = height;

    }

  }

​

}

​