constructor(xPos, yPos, xSpeed, ySpeed) {

    this.xPos = xPos;

    this.yPos = yPos;

    this.xSpeed = xSpeed;

    this.ySpeed = ySpeed;

  }

​

  move() {

    // move the ball

    this.xPos += this.xSpeed;

    this.yPos += this.ySpeed;

  }

​

  checkForCollisions() {

    // check first for left and right wall

    if (this.xPos <= 15 || this.xPos >= width - 15) {

      this.xSpeed = this.xSpeed *-1;

    }

​

    // do the same for the ceiling and the floor

    if (this.yPos <= 15 || this.yPos >= height - 15) {

      this.ySpeed = -this.ySpeed;

    }

  }

​

  draw() {

    fill(random(255), random(255), random(255));

    square(this.xPos, this.yPos, 30);

  }

}

​

let lines;

​

function setup() {

  createCanvas(400, 400);

  lines = new movingLine(30, 30, 5, 0);

}

​

function draw() {

  background(240);

  lines.move();

  lines.checkForCollisions();

  lines.draw();

  lines.changeColor;

}

​