dithered paths

let canvas = document.querySelector('canvas'),
    ctx = canvas.getContext('2d'),
    height = 600,
    width = 800,
    pChangeDirection = 0.9;

// points of a triangle
let p1 = {
    x: 226,
    y: 425
};

let p2 = {
    x: 428,
    y: 130
};

let p3 = {
    x: 623,
    y: 425
}

function drawPath(ctx, points) {
    ctx.beginPath();
    ctx.strokeStyle = 'rgba(0, 0, 0, 1)';
    ctx.lineWidth = 1;
    ctx.moveTo(points[0].x, points[0].y);
    for (let i = 1; i < points.length; i++) {
        ctx.lineTo(points[i].x, points[i].y);
    }
    ctx.stroke();
}

function getDist(p1, p2) {
    return (p2.x - p1.x) * (p2.x - p1.x) + (p2.y - p1.y) * (p2.y - p1.y);
}

function computePath(start, end) {
    let count = 0,
        path = [],
        point = {
            x: start.x,
            y: start.y
        },
        distThresh = 10,
        dist = 1000,
        angle = 0,
        angleResolution = Math.PI / 4,
        angleSpread = Math.PI / 4,
        speedScale = d3.scaleLinear()
            .domain([100, 0]).range([3, 0.01]).clamp(true);

while (dist > distThresh && count < 10000) {
        if (Math.random() < pChangeDirection) {
            let desiredAngle = Math.atan2(end.y - point.y, end.x - point.x);
            angle = d3.randomNormal(desiredAngle, angleSpread)();
            angle = Math.round(angle / angleResolution) * angleResolution;
        }

let speed = speedScale(dist);
        point.x += Math.cos(angle) * speed; // move in the direction
        point.y += Math.sin(angle) * speed;
        count += 1;
        dist = getDist(point, end);
        path.push({
            x: point.x,
            y: point.y
        });
    }

return path;
}

ctx.globalAlpha = 0.2;

function draw() {
    ctx.fillStyle = 'rgba(255, 255, 255, 0.6)';
    ctx.fillRect(0, 0, width, height);
    drawPath(ctx, computePath(p1, p2));
    drawPath(ctx, computePath(p2, p3));
    drawPath(ctx, computePath(p3, p1));

window.requestAnimationFrame(draw);
}

window.requestAnimationFrame(draw);

</script>
</body>

https://d3js.org/d3.v4.min.js