​

function setup() {

  createCanvas(560,390);

  background(220);

  w = new Walker(); 

}

​

function draw() {

  w.step();

  w.render();

}

​

class Walker {

  constructor() {

    this.x = width/2; 

    this.y = height/2; 

  }

​

  render() { 

    stroke(63,63,147);

    point(this.x,this.y);

  }

​

  step() { 

    //4 possible steps

    let choice = floor(random(4)); 

    if (choice === 0) {

      this.x++;

    } else if (choice == 1) {

      this.x--;

    } else if (choice == 2) {

      this.y++;

    } else {

      this.y--;

    }

    this.x = constrain(this.x,0,width-1);

    this.y = constrain(this.y,0,height-1);

  }

}