​

function setup() {

  createCanvas(900, 900);

  builders[0] = new Builder(width / 2, height);

  background(0);

  blendMode(ADD);

}

​

function draw() {

  builders[0].update();

}

​

class Builder{

  constructor(x, y){

    this.pos = createVector(x, y);

    this.vel = createVector(0, -1);

    this.a = width / 2;

    this.t = 0.5;

  }

  update(){

    if(this.pos.y > -1 && frameCount % 10 == 0){

      stroke(255, 20);

      strokeWeight(1);

      noFill();

      // line(width, height, this.pos.x + this.a, this.pos.y);

      // line(0, height, this.pos.x - this.a, this.pos.y);

      bezier(this.pos.x - this.a, this.pos.y, this.pos.x - this.a, height, this.pos.x + this.a, height, this.pos.x + this.a, this.pos.y);

      // line(width / 2, height, this.pos.x + this.a, this.pos.y);

      // line(width / 2, height, this.pos.x - this.a, this.pos.y);

      // line(width - width / 4, height, this.pos.x + this.a, this.pos.y);

      // line(0 + width / 4, height, this.pos.x - this.a, this.pos.y);

      bezier(width / 2, height, this.pos.x + this.a, this.pos.y, this.pos.x - this.a, this.pos.y, width / 2, height);

      // line(width / 2, height, this.pos.x + this.a, this.pos.y);

      // line(width / 2, height, this.pos.x - this.a, this.pos.y);

      this.a = this.a - 10;

    }

    // this.vel.setHeading(noise(this.pos.x / 100, this.pos.y / 100));

    // this.t = this.t - 0.001;

    this.pos.setHeading(noise(this.pos.x / 1000, this.pos.y / 1000));

    this.pos.add(this.vel);

  }

}