Homework6.2

by wayne6172

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/84/three.min.js"></script>
<script src="https://threejs.org/examples/js/controls/OrbitControls.js"></script>
<script src="https://jyunming-chen.github.io/tutsplus/js/KeyboardState.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/stats.js/r16/Stats.min.js"></script>

CSS

body{
    overflow: hidden
}

JavaScript

var camera, scene, renderer, mesh, controls, line, stats, clock;
var keyboard = new KeyboardState();
var k = 4;

var car;
var radius = 60, angle, time = 0;
var omega = Math.PI * 2 / 30;


(function() {
  Math.clamp = function(val,min,max){
    return Math.min(Math.max(val,min),max);
  }})();
  
init();
animate();

function buildVehicle() {
  var car = new THREE.Object3D();
  var mat = new THREE.MeshNormalMaterial();
  var body = new THREE.Mesh(new THREE.CylinderGeometry(5, 5, 2, 20), mat);
  car.add(body);
  var pointer = new THREE.Mesh(new THREE.BoxGeometry(10, 2, 2), mat);
  car.add(pointer);
  pointer.position.x = 5;
  return car;
}

function init() {
  scene = new THREE.Scene();
  clock = new THREE.Clock();
  stats = new Stats();
  stats.domElement.style.position = 'absolute';
  stats.domElement.style.top = '0px';
  stats.domElement.style.zIndex = 100;
  document.body.appendChild(stats.domElement);

  camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1000);
  camera.position.set(80,50,80);
  camera.lookAt(new THREE.Vector3());
  scene.add(camera);

  var gridXZ = new THREE.GridHelper(200, 20, 'red', 'white');
  scene.add(gridXZ);
  scene.add(new THREE.AxisHelper(50));

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

  controls = new THREE.OrbitControls(camera, renderer.domElement);
  
  controls.enableKeys = false;
  
  document.body.appendChild(renderer.domElement);
  ////////////////////////////////////////////////////////////////////////
  	
  car = buildVehicle();
  scene.add(car);

  if(k % 2 == 0)k *= 2;
}

function update() {

  keyboard.update();
  
  time += clock.getDelta();

  var nextX = radius * Math.cos(k * omega * time) * Math.cos(omega * time);
  var nextZ = -radius * Math.cos(k * omega * time) * Math.sin(omega * time);
  
  /*var nextX = radius * Math.cos(omega * time);
  var nextY = radius * Math.sin(omega * time);*/

 ...