​

class Particle {

  constructor(x, y) {

    this.pos = createVector(x, y);

    this.opos = createVector(x, y);

    this.vel = createVector(0, 0);

  }

​

  display() {

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

  }

​

  move() {

    let acc = createVector(random(-1, 1), random(-1, 1));

    this.vel.add(acc);

    this.vel.limit(maxSpeed);

    this.pos.add(this.vel);

  }

​

  wrap() {

    if (this.pos.x > width) {

      this.pos.x = 0;

    }

    if (this.pos.x < 0) {

      this.pos.x = width;

    }

    if (this.pos.y > height) {

      this.pos.y = 0;

    }

    if (this.pos.y < 0) {

      this.pos.y = height;

    }

  }

​

  avoid(snake) {

    let dist = this.pos.dist(snake.pos);

    let distoriginal = this.pos.dist(this.opos);

    if (dist < 20) {

      let steer = p5.Vector.sub(this.pos,snake.pos);

      steer.mult(exp(20-dist));

      this.vel.add(steer);

    }

    else if(distoriginal > 0.1 && dist > 25)

    {

      let steer = p5.Vector.sub(this.opos,this.pos);

      this.vel.add(steer);

    }

​

    this.vel.limit(maxSpeed);

    this.pos.add(this.vel);

    this.vel = createVector(0,0);

​

  }

}

​

let particles = [];

let numParticles = 500;

let snake;

​

function setup() {

  createCanvas(400, 400);

  for (let i = 0; i < numParticles; i++) {

    particles[i] = new Particle(random(0, width), random(0, height));

  }

  snake = new Particle(width / 2, height / 2);

}

​

function draw() {

  background(220);

  for (let i = 0; i < numParticles; i++) {

    fill(255);

    particles[i].display();

    particles[i].avoid(snake);

  }

​

  fill(255, 0, 0);

  snake.display();

  snake.move();

  snake.wrap();

​

​

}