​

class MoldDirector extends Director {

  create(parent) {

    let actor = super.create(parent)

    actor.d = Math.random() * PI * 2

    actor.v = 1

    return actor

  }

​

  update(actor) {

    let result = super.update(actor)

    if (result) {

      let dirs = [-Math.PI / 4, 0, Math.PI / 4]

      let max_c = 255

      let dir = actor.d

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

        let look_x = actor.x + cos(dirs[i] + actor.d) * 5

        let look_y = actor.y + sin(dirs[i] + actor.d) * 5

        let c = get(look_x, look_y)[0]

        if (c < max_c) {

          c = max_c

          dir = dirs[i] + actor.d

        }

      }

​

      actor.d = lerp(actor.d, dir, Math.random())

      actor.d += (Math.random() - 0.5) * PI / 16

    }

    return result

  }

​

  should_spawn(actor) {

    return Math.random() > actor.age / actor.lifetime

  }

​

  draw(actor) {

    stroke(0, 0, 0, 128)

    strokeWeight(0.5)

    point(actor.x, actor.y)

  }

​

  spawn(actor) {

    let new_actor = super.spawn(actor)

    if (new_actor) {

      new_actor.d = actor.d + (Math.random() - 0.5) * PI

      new_actor.v = actor.v

      new_actor.lifetime = get(new_actor.x, new_actor.y)[0]

    }

    return new_actor

  }

}

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(255)

  director = new MoldDirector(

    1000,   // max actors

    1       // seed actors

  )

  director.initialize()

}

​

function draw() {

  director.process_and_draw()

}

​