Tributary inlet

_.md

[ Launch: Tributary inlet ] 5100537 by moul

config.json

{"description":"Tributary inlet","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}

inlet.js

//playing with noise.js from Joseph Gentle
//https://github.com/josephg/noisejs
 
 
var periodx = 0.0020613;
var periody = 0.003;
var r = 1.12946;
var rot = -0.38286;
var mult = 1.96;
var pw = 1.5;
var ph = 1.5;
var amult = 0.0 * Math.PI;
var zspeed = 0.00038;
var alpha = 0.0492;
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 <= 3026; _i++) {
  type = Math.floor(Math.random() * 2);
  d = Math.floor(Math.random() * 128 + type * 128);
  particles.push({
    x: Math.random() * w,
    y: 114 + Math.random() * 640,
    a: type / 2 * TAU + amult * _i
  });
}
 
var z = 0;
function draw() {
  ctx.fillStyle = "rgba(255,255,255," + alpha + ")";
  ctx.fillRect(0,0,w,h);
  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 * periodx, p.y * periody, z);
    v *= 2;
    ctx.fillStyle = "hsla(" + (Math.floor(v*219)) + ", 95%, 20%, 0.8)";
    ctx.fillRect(p.x, p.y, pw, ph);
    
    a = mult * v * 2 * Math.PI;// + p.a;
    p.x += r * Math.sin(-a * rot);
    p.y += r * Math.cos(-a * rot);
    
    if ((p.x < 0 || p.x >= w) || (p.y < 0 || p.y >= h)) {
      p.x = Math.random() * w;
      p.y = Math.random() * h;
    } 
  }
};
 
tributary.run = function(g,t) {
  draw();
  z += zspeed;
}