​

let pts = [];

let onPressed = true;

let showInstruction = true;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  colorMode(HSB);

  rectMode(CENTER);

  background(255);

}

​

function mousePressed() {

  onPressed = true;

}

​

function mouseReleased() {

  onPressed = false;

}

​

function keyPressed() {

  if (key == "c") {

    pts = [];

    clear();

    background(255);

  }

}

​

function draw() {

  if (mouseIsPressed) {

    for (let i = 0; i < 10; i++) {

      newP = new Particle(mouseX, mouseY, i + pts.length, i + pts.length);

      pts.push(newP);

    }

  }

​

  pts = pts.filter((x) => !x.dead);

  for (let i = pts.length - 1; i > -1; i--) {

    p = pts[i];

    p.update();

    p.display();

  }

}

​