walker_es6.js

walker_es6.js

// The Nature of Code
// Daniel Shiffman
// http://natureofcode.com

let walker

function setup() {
    createCanvas(640,360)
    walker = new Walker()
    background(127)
}

function draw() {
    walker.step()
    walker.render()
}

class Walker {

    constructor() {
        this.x = width/2
        this.y = height/2
    }

    render() {
        stroke(0)
        point(this.x,this.y)
    }

    step() {
        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)
        
    }

}