appendices/tweening.html

<!DOCTYPE html>
<html>
 <head> 
  <title>Appendix B - Tweening</title>
  <!-- tweening functions: http://sole.github.io/tween.js/examples/03_graphs.html -->
  <style>
    body{
      margin: 0;
      overflow: hidden;
    }

    #stats {  /* Align stats top-left */
      position: absolute;
      left: 0px;
      top: 0px;
    }
  </style> 
  </head>
  <body> 
  <!-- JavaScript libraries -->
  <script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
  <script src="http://cdnjs.cloudflare.com/ajax/libs/three.js/r67/three.min.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/stats.js/r11/Stats.min.js"></script>
  <script src="../examples/assets/libs/TrackballControls.js"></script>
  <script src="../examples/assets/libs/tween.min.js"></script>
  <!-- Javascript code that runs our Three.js examples --> 
  <script>
    // once everything is loaded, we run our Three.js stuff.
    $(function () {

      var stats = initStats();

      // create a scene, that will hold all our elements such as objects, cameras and lights.
      var scene = new THREE.Scene();

      // create a camera, which defines where we're looking at.
      var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);

      // create a render and set the size
      var renderer = new THREE.WebGLRenderer({antialias: true});

      // create trackball controls
      var trackballControls = new THREE.TrackballControls(camera);

      renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0));
      renderer.setSize(window.innerWidth, window.innerHeight);

      // create the ground plane
      var planeGeometry = new THREE.PlaneGeometry(60,20);
      var planeMaterial =  new THREE.MeshLambertMaterial({color: 0xffffff});
      plane = new THREE.Mesh(planeGeometry,planeMaterial);

      // rotate and position the plane
      plane.rotation.x=-0.5*Math.PI;
      plane.position.set(15,0,0);

      // add the plane to the scene
      scene.add(plane);

      // create a cube
      var cubeGeometry = new THREE.BoxGeometry(4,4,4);
      var cubeMaterial = new THREE.MeshLambertMaterial({color: 0xff0000});
      var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);

      // position the cube
      cube.position.set(-4,3,0);

      // add the cube to the scene
      scene.add(cube);

      var sphereGeometry = new THREE.SphereGeometry(4,20,20);
      var sphereMaterial = new THREE.MeshLambertMaterial({color: 0x7777ff});
      var sphere = new THREE.Mesh(sphereGeometry,sphereMaterial);

      // position the sphere
      sphere.position.set(20,4,2);

      // add the sphere to the scene
      scene.add(sphere);

      // position and point the camera to the center of the scene
      camera.position.set(-30,40,30);
      camera.up = new THREE.Vector3(0,1,0);
      camera.lookAt(scene.position);

      // add subtle ambient lighting
      var ambientLight = new THREE.AmbientLight(0x0c0c0c);
      scene.add(ambientLight);

      // add spotlight for the shadows
      var spotLight = new THREE.SpotLight( 0xffffff );
      spotLight.position.set(-40,60,-10);
      scene.add(spotLight);

      // add axis helper
      var axisHelper = new THREE.AxisHelper(3);
      scene.add(axisHelper);

      // add the output of the renderer to the html element
      $('body').append(renderer.domElement);

      var cubeTweenBack = new TWEEN.Tween(cube.position)
        .to({x: -4, y: 3, z: 0}, 2000)
        .easing(TWEEN.Easing.Quadratic.InOut);

      var cubeTween = new TWEEN.Tween(cube.position)
        .to({x: -13, y: 3, z: -5}, 4000)
        .easing(TWEEN.Easing.Bounce.Out)
        .chain(cubeTweenBack)
        .start();

      var sphereTween = new TWEEN.Tween(sphere.position)
        .to({x:0, y: 3, z:0}, 1000)
        .delay(1000)
        .start();

      // call the render function
      render();

      function render() {
        stats.update();
        trackballControls.update();
        TWEEN.update();

        // render using requestAnimationFrame
        requestAnimationFrame(render);
        renderer.render(scene, camera);
      }

      function initStats() {
        var stats = new Stats();
        stats.setMode(0); // 0: fps, 1: ms
        $('body').append(stats.domElement);
        return stats;
      }
    });
  </script>  
 </body>
</html>