motion/riverKanies_firework.html at master · cha-art-dev/motion · GitHub

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<html>
<head>
  <title>Art / Dev - Motion 2</title>
  <script src="p5.min.js"></script>
  <script>
  var IMAGE_WIDTH = 640;    // Don't change this.
  var IMAGE_HEIGHT = 640;   // Don't change this.

  var particleCount = 200;
  var particles = [];
  var particleCounter = 0;

  //=============== DO ALL YOUR WORK HERE =======================

  function setup() {
    createCanvas(IMAGE_WIDTH, IMAGE_HEIGHT); // don't change this

     for (var i=0; i<particleCount; i++) {
      var magnitude = random(0,2);
      var angle = random(0,TWO_PI);
       particles[i] = {
         x:10000,//320+magnitude*cos(angle),
         y:10000,//320+magnitude*sin(angle),
         vx: magnitude*cos(angle),//0,
         vy: magnitude*sin(angle),//0,
         r: random(5,12),
         hue: random(0.05,0.1),
        };
     }
     noStroke()
     colorMode(HSB, 1)
  }

  function draw() {
    fill(.5,1,.4,0.01);
    rect(0,0,width,height);

    var magnitude = random(0,2);
    var angle = random(0,TWO_PI);

    var currentParticle = particles[particleCounter];
    particleCounter = (particleCounter+1) % particleCount;
    currentParticle.x = 320//mouseX;
    currentParticle.y = 100//mouseY;
    currentParticle.vx = magnitude*cos(angle)
    currentParticle.vy = magnitude*sin(angle)
    particles.forEach(drawParticle);
  }

  function calculateParticle(particle) {
    particle.x += particle.vx
    particle.y += particle.vy
    particle.vy += .01
  }

  function drawParticle(particle) {
    calculateParticle(particle)
    fill(particle.hue,.5,1,0)//hue,sat,bright,alpha
    ellipse(particle.x,particle.y,particle.r,particle.r)
  }

  // =============== STOP WORKING HERE ==========================

  </script>
  <style>
    body { padding: 0; margin: 5% 0 0; background-color: #666;}
    canvas { margin: 0 auto; display:block; }
  </style>
</head>
<body>
</body>
</html>