let r = 4;

​

function setup(){

    createCanvas(400, 400);

    tree[0] = createVector(width/2, height/2);

}

​

function draw(){

    background(0);

    let walker = createVector(random(width), random(height));

    let stuck = false;

    while (!stuck) {

        for (let i = 0; i < tree.length; i++){

            let d = p5.Vector.dist(walker, tree[i]);

            if (d < r * 2){

                stuck = true;

                break;

            }

        }

​

        let vel = p5.Vector.random2D();

        walker.add(vel);

        walker.x = constrain(walker.x, 0, width);

        walker.y = constrain(walker.y, 0, height);

    }

​

    tree.push(walker);

    for (let i = 0; i < tree.length; i++){

        strokeWeight(r * 2);

        stroke(255, 100);

        point(tree[i].x, tree[i].y);

    }

}