hw2 helper

by Rebecca Chen

HTML

<div id="info">Move and Jump
<br>arrow keys
</div>
<script src="http://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>
<script src="http://jyunming-chen.github.io/tutsplus/js/KeyboardState.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 mouse = new THREE.Vector2();
var pos, vel, force;
var m = 1;
var clock = new THREE.Clock();
var ballFrame;
var keyboard = new KeyboardState();
var onFloor;

init();
animate();

function init() {
  renderer = new THREE.WebGLRenderer({
    antialias: true
  });

  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.setClearColor(0x888888);
  document.body.appendChild(renderer.domElement);

  scene = new THREE.Scene();
  camera = new THREE.OrthographicCamera(-50, 50, 50, -50, -10, 100);
  camera.position.z = 10;
  scene.add(camera);

  ////////////////////////////////////////////////////////////////////////////////////////////
  var floor = new THREE.Mesh(new THREE.PlaneGeometry(100, 50), new THREE.MeshBasicMaterial({color:0xff1234}));
  floor.position.set(0, -25, 0);
  scene.add(floor);

  var ball = new THREE.Mesh(new THREE.CircleGeometry(5, 20),  new THREE.MeshBasicMaterial({color:0x12ff34}));
  ballFrame = new THREE.Object3D();
  scene.add(ballFrame);
  ballFrame.add(ball);
  ball.position.y = 5;

  pos = new THREE.Vector3(-30, 15, 0);
  vel = new THREE.Vector3(0,0,0);
  force = new THREE.Vector3();

  window.addEventListener('resize', onWindowResize, false);
}

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

function animate() {
  keyboard.update();
  if (onFloor) {
  if (keyboard.down("up")) {
		vel.y += 20;
  }
	if (keyboard.down("right")) {
  	vel.x = 10;
  } else if (keyboard.down("left")) {
  	vel.x = -10;
  } else if (keyboard.down("down")) {
  	vel.x = 0;
  }
	}
  
  var dt = clock.getDelta();
  force.set(0, -10, 0);

  vel.add(force.clone().multiplyScalar(1. / m * dt));
  pos.add(vel.clone().multiplyScalar(dt));

  ballFrame.position.copy(pos);

  // collision 
  onFloor = false;
  if (pos.y < 0) {
    pos.y = 0;
    vel.y *= -0.3;
  }
  if (pos.y <= 0) {
  	onFloor =...