function clamp(x, min_x, max_x) {
    return min(max(x, min_x), max_x)
}

class Walker {
    constructor(x = 0, y = 0) {
        this.x = x
        this.y = y
    }

    step() {
        let dx = 0
        let dy = 0
        if (random(1) < 0.5) {
            dx = clamp(mouseX - this.x, -1, 1)
            dy = clamp(mouseY - this.y, -1, 1)
        } else {
            dx = floor(random(3)) - 1
            dy = floor(random(3)) - 1
        }

        this.x += dx
        this.y += dy
    }

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

let walker

function setup() {
    createCanvas(640, 240)
    background(255)
    walker = new Walker(320, 120)
}

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