var target;

​

function setup() {

  createCanvas(600, 400);

  for (var i = 0; i < 10; i++) {

    particles.push(new Particle());

  }

  background(0);

  target = createVector(0, 200);

}

​

function draw() {

  for (var i = 0; i < 10; i++) {

    particles[i].show();

    particles[i].update();

  }

  target.x = target.x + 1;

}

​

function Particle() {

  this.pos = createVector(random(width), random(height));

  this.vel = createVector(1, 0);

  this.acc = createVector(-0.01, 0);

​

  this.show = function() {

    strokeWeight(4);

    stroke(255);

    point(this.pos.x, this.pos.y);

  }

​

  this.update = function() {

​

    // Direction

    //acc = new PVector(mouseX - pos.x, mouseY - pos.y);

    this.acc = p5.Vector.sub(target, this.pos);

​

    // Magnitude

    this.acc.setMag(1);

    this.pos.add(this.vel);

    this.vel.add(this.acc);

    this.vel.limit(5);

  }

}