perlin curtain

_.md

[ Launch: perlin curtain ] 5105327 by enjalot
[ Launch: perlin worms ] 5062100 by enjalot
[ Launch: perlin noise ] 5062000 by enjalot
[ Launch: perlin noise ] 5061982 by enjalot

config.json

{"description":"perlin curtain","endpoint":"","display":"canvas","public":true,"require":[{"name":"perlin","url":"https://raw.github.com/josephg/noisejs/master/perlin.js"}],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"fullscreen":false,"play":true,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01,"thumbnail":"http://i.imgur.com/86ReLcF.jpg"}

inlet.js

//playing with noise.js from Joseph Gentle
//https://github.com/josephg/noisejs


var period = 1.04333 / 300;
var r = 1.04;
var mult = 1;
var pw = 1.5;
var ph = 1.5;
var zspeed = 0.00038;
var z = 0;



var TAU = 2 * Math.PI;

var ctx = tributary.ctx;
var canvas = tributary.canvas;
w = canvas.width;
h = canvas.height;


ctx.fillStyle = 'white';

ctx.fillRect(0, 0, w, h);

ctx.fillStyle = 'rgba(1,1,1,0.3)';

//noise.seed(Math.random());

particles = [];

for (_i = 1; _i <= 2000; _i++) {
  type = Math.floor(Math.random() * 2);
  d = Math.floor(Math.random() * 128 + type * 128);
  particles.push({
    x: Math.random() * w,
    it: 0,
    y: 0,//313 + Math.random() * 60,
    a: 0//type / 2 * TAU
  });
}

function draw() {
  var a, p, v, _i, _len, _ref, _ref1;
  for (_i = 0, _len = particles.length; _i < _len; _i++) {
    p = particles[_i];
    v = noise.simplex3(p.x * period, p.y * period, z);
    //v = noise.simplex2(p.x * period, p.y * period);
    ctx.fillStyle = "hsla(" + (Math.floor(v * 360)) + ", 95%, 20%, 0.3)";
    ctx.fillRect(p.x, p.y, pw, ph);
    
    a = mult * v * 2 * Math.PI + p.a;
    p.x += r * Math.cos(a) - 0.5;
    p.y += r * Math.sin(a) + 1.5;
    
    if ((p.x < 0 || p.x >= w) || (p.y < 0 || p.y >= h)) {
      p.x = Math.random() * w;
      //p.it += 50;
      p.y = p.it//Math.random() * h;
    } 
  }
};

tributary.run = function(g,t) {
  draw();
  z += zspeed;
}