Hierarchy Study

solar system

by jmchen

HTML

<div id="info">Hierarchy Study
  <br><br>
  Solar System
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>

CSS

#info {
  position: absolute;
  top: 0px;
  width: 100%;
  padding: 10px;
  text-align: center;
  color: #ffff00
}

body {
  overflow: hidden;
}

JavaScript

var camera, scene, renderer;
var angle = 0;
var sun, earth;

init();
animate();

function init() {
  scene = new THREE.Scene();

  camera = new THREE.OrthographicCamera(-50, 50, 50, -50, -10, 10);
  camera.position.z = 10;
  scene.add(camera);

  var gridXZ = new THREE.GridHelper(50, 10);
  gridXZ.setColors(new THREE.Color(0xff00ff), new THREE.Color(0xffffff));
  gridXZ.rotation.x = Math.PI / 2;
  scene.add(gridXZ);

  renderer = new THREE.WebGLRenderer();
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.setClearColor(0x888888);

  document.body.appendChild(renderer.domElement);
  window.addEventListener('resize', onWindowResize, false);
	///////////////////////////////////////////////////////////////
  sun = new THREE.Mesh (new THREE.CircleGeometry(15,8), new THREE.MeshBasicMaterial({wireframe:true}));
  earth = new THREE.Mesh (new THREE.CircleGeometry (8,8), new THREE.MeshBasicMaterial({wireframe:true}));
  scene.add (sun);
  sun.add (earth);
}

function onWindowResize() {
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(window.innerWidth, window.innerHeight);
}


function animate() {
  angle += 0.01;

	sun.rotation.z = angle;
  earth.position.x = 30;
  earth.rotation.z = -angle - 3*angle;
  
  requestAnimationFrame(animate);
  renderer.render(scene, camera);
}