​

class Walker {

  constructor(x, y) {

    if (arguments.length == 2) {

      this.pos = createVector(x, y);

      this.stuck = true;

    } else {

      this.pos = randomPoint();

      this.stuck = false;

    }

    this.r = radius;

  }

​

  walk() {

    var vel = p5.Vector.random2D();

    // var vel = createVector(random(-1, 1), random(-0.5, 1));

    this.pos.add(vel);

    this.pos.x = constrain(this.pos.x, 0, width);

    this.pos.y = constrain(this.pos.y, 0, height);

  }

​

​

  checkStuck(others) {

    for (var i = 0; i < others.length; i++) {

      let d = distSq(this.pos, others[i].pos);

      if (d < (this.r * this.r + others[i].r * others[i].r + 2 * others[i].r * this.r)) {

        //if (random(1) < 0.1) {

        this.stuck = true;

        return true;

      }

    }

    return false;

  }

​

  setHue(hu) {

    this.hu = hu;

  }

​

  show() {

    noStroke();

    if (this.stuck && typeof this.hu !== 'undefined') {

      fill(this.hu, 255, 100, 200);

    } else {

      fill(360, 0, 255);

    }

    ellipse(this.pos.x, this.pos.y, this.r * 2, this.r * 2);

  }

​

​

}

​

function randomPoint() {

  var i = floor(random(4));

​

  if (i === 0) {

    let x = random(width);

    return createVector(x, 0);

  } else if (i === 1) {

    let x = random(width);

    return createVector(x, height);

  } else if (i === 2) {

    let y = random(height);

    return createVector(0, y);

  } else {

    let y = random(height);

    return createVector(width, y);

  }

}

​

​

​

function distSq(a, b) {

  var dx = b.x - a.x;

  var dy = b.y - a.y;

  return dx * dx + dy * dy;

}