Naturn of Code

https://github.com/nature-of-code/noc-examples-p5.js/tree/master/chp04_systems/NOC_4_07_ParticleSystemForcesRepeller

*/

​

let repeller;

let ps = [];

let H = 40;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  colorMode(HSB, 360, 100, 100, 100);

  frameRate(20);

  background(H, 50, random(70,100))

  ps = new ParticleSystem(createVector(width/2, 0));

  repeller = new Repeller();

}

​

function draw() {

  background(H, 50, random(70,100), 5);

  // Hue change

  H += 1;

  if (H >= 70){

    H = 50;

  }

  if (frameCount%5==0){

  push();

  //scale(random(.4,.5));

  translate(0, height*.4)

  grid();

  pop();

  }

  ps.addParticle(random(width), height*.2);

​

  // Apply gravity force to all Particles

  let gravity = createVector(0, random(0.2));

  ps.applyForce(gravity);

​

ps.applyRepeller(repeller);

  repeller.run();

  ps.run();

}