Galactic Orbitals

galactic-orbitals.markdown

Galactic Orbitals

Galaxy clusters orbiting galaxy clusters, orbiting galaxy clusters...After a short while of orbiting, smaller clusters travel to the centers of larger galaxies && connections are formed
Extension of Foo Particles to Foo Bar Particles. Foo holds our Math equations for motion while Bar specifies x,y positions && velocity. Fairly flexible, very short. Will likely do a variation or two..

A Pen by Tiffany Rayside on CodePen.

License.

index.html

<canvas id='canv'></canvas>

script.js

var c = document.getElementById('canv');
var $ = c.getContext('2d');
var w = c.width = window.innerWidth;
var h = c.height = window.innerHeight;

window.addEventListener('resize', function(){
  c.width = w = window.innerWidth;
  c.height = h = window.innerHeight;
}, false);

var num = w * h / 810;
var arr = [];
var i = 0;

while (arr.length < num) {
  arr.push({
    x: (Math.random() * w) | 0,
    y: (Math.random() * h) | 0,
    vx: 0,
    vy: 0
  });
}

function _X(foo) {
  return Math.sin(foo.y / 45 ) / 0.3;
}

function _Y(foo) {
  return Math.sin(foo.x / 45 ) / 0.3;
}

function upd(bar) {
  var n = arr[i];
  n.x += n.vx;
  n.y += n.vy;
  if (n.x < 0) {
    n.x = w + n.x;
  } else if (n.x >= w) {
    n.x -= w;
  }

  if (n.y < 0) {
    n.y = h + n.y;
  } else if (n.y >= h) {
    n.y -= h;
  }

  n.vy = _Y(n);
  n.vx = _X(n);
}

function draw(bar) {
  var n = arr[i];
  var col = 'hsla(' +  i + ',90%, 60%, 1)';
  //outer rings
  $.beginPath();
  $.fillStyle = col;
  $.globalAlpha = .1;
  $.arc(n.x, n.y, 15 / Math.max((n.vx * n.vx + n.vy * n.vy), 0.5), 0, 2 * Math.PI, 0);
  $.closePath();
  $.fill();
  //inner rings
  $.beginPath();
  $.globalAlpha = 1;
  $.fillStyle = col;
  $.arc(n.x, n.y, 8 / Math.max((n.vx * n.vx + n.vy * n.vy), 0.8), 0, 2 * Math.PI, 0);
  $.closePath();
  $.fill();
}

function go() {
  $.fillStyle = 'hsla(0,0%,0%,1)';
  $.fillRect(0, 0, w, h);
  for (i = 0; i < num; i++) {
    upd(i);
    draw(i);
  }
};

run();
function run() {
  window.requestAnimationFrame(run);
  go();
}

style.css

body{
  width:100%;
  margin:0;
  overflow:hidden;
  background:hsla(0,0%,0%,1);
}