let attractor;

​

function setup() {

  createCanvas(800, 600);

  attractor = new Attractor(width / 2, height / 2);  //have attractor in the middle of the screen

​

  for (let i = 0; i < 500; i++) {

    bees.push(new Bee(random(width), random(height)));

  }

}

​

function draw() {

  background(123);

​

  for (let bee of bees) {

    let attraction = attractor.attract(bee);

    bee.applyForce(attraction);

    bee.update();

    bee.constrainToEdges();

    bee.display();

  }

​

  attractor.walk();

  attractor.display();

}

​

class Bee {

  constructor(x, y) {

    this.pos = createVector(x, y);

    this.vel = p5.Vector.random2D();

    this.acc = createVector();

    this.maxSpeed = 100;          //speed of the particles 

  }

​

  applyForce(force) {

    this.acc.add(force);

  }

​

  update() {

    this.vel.add(this.acc);

    this.vel.limit(this.maxSpeed);

    this.pos.add(this.vel);

    this.acc.set(0, 0);

  }

​

  constrainToEdges() {

    this.pos.x = constrain(this.pos.x, 0, width);      //have it conbeeines around the edges

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

  }

​

  display() {

    let distance = p5.Vector.dist(attractor.pos, this.pos);

    let alphaValue = map(distance, 100, 500, 255, 0); // Map distance to alpha (transparency)

​

    let choice = random();

    if (choice > 0 && choice < 1/3) {

      fill(255, 215, 0, alphaValue);

    } else if(choice > 1/3 && choice < 2/3){

      fill(255, alphaValue);

    }

    else{

    fill(0,alphaValue)}

    noStroke();

    ellipse(this.pos.x, this.pos.y, 5, 5);

  }

}

​

class Attractor {

  constructor(x, y) {

    this.pos = createVector(x, y);

    this.mass = 50;

  }

​

  attract(bee) {

    let force = p5.Vector.sub(this.pos, bee.pos);

    let distance = force.mag();

    distance = constrain(distance, 100, 500);

    force.normalize();

​

    let strength = (1 * this.mass * bee.mass) / (distance * distance);

    force.mult(strength);

​

    return force;

  }

​

  walk() {

    this.pos.add(p5.Vector.random2D().mult(5));

  }

​

  display() {

    // noFill();

    noStroke();

    fill(237, 208, 92);

    ellipse(this.pos.x, this.pos.y, 20, 20);

  }

}

​

​