javascript
/
three.js
镜像来自 https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Game - Player Input</title>
    <style>
    html {
      box-sizing: border-box;
    }
    *, *:before, *:after {
      box-sizing: inherit;
    }
    html, body {
        margin: 0;
        height: 100%;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    #ui {
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      display: flex;
      justify-items: center;
      align-content: stretch;
    }
    #ui>div {
      display: flex;
      align-items: flex-end;
      flex: 1 1 auto;
    }
    .bright {
      filter: brightness(2);
    }
    #left {
      justify-content: flex-end;
    }
    #right {
      justify-content: flex-start;
    }
    #ui img {
      padding: 10px;
      width: 80px;
      height: 80px;
      display: block;
    }
    #loading {
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      font-size: xx-large;
      font-family: sans-serif;
        }
    #loading>div>div {
      padding: 2px;
    }
    .progress {
      width: 50vw;
      border: 1px solid black;
    }
    #progressbar {
      width: 0%;
      height: 1em;
      background-color: #888;
      background-image: linear-gradient(
        -45deg,
        rgba(255, 255, 255, .5) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, .5) 50%,
        rgba(255, 255, 255, .5) 75%,
        transparent 75%,
        transparent
      );
      background-size: 50px 50px;
      animation: progressanim 2s linear infinite;
    }

    @keyframes progressanim {
      0% {
        background-position: 50px 50px;
      }
      100% {
        background-position: 0 0;
      }
    }
  </style>
  </head>
  <body>
    <canvas id="c" tabindex="1"></canvas>
    <div id="ui">
      <div id="left"><img src="resources/images/left.svg"></div>
      <div style="flex: 0 0 40px;"></div>
      <div id="right"><img src="resources/images/right.svg"></div>
    </div>
    <div id="loading">
      <div>
        <div>...loading...</div>
        <div class="progress"><div id="progressbar"></div></div>
      </div>
    </div>
  </body>
<script src="resources/threejs/r105/three.min.js"></script>
<script src="resources/threejs/r105/js/controls/OrbitControls.js"></script>
<script src="resources/threejs/r105/js/loaders/GLTFLoader.js"></script>
<script src="resources/threejs/r105/js/utils/SkeletonUtils.js"></script>
<script>
'use strict';

/* global THREE */

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});

  const fov = 45;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 1000;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.set(0, 40, 80);

  const controls = new THREE.OrbitControls(camera, canvas);
  controls.enableKeys = false;
  controls.target.set(0, 5, 0);
  controls.update();

  const scene = new THREE.Scene();
  scene.background = new THREE.Color('white');

  function addLight(...pos) {
    const color = 0xFFFFFF;
    const intensity = 1;
    const light = new THREE.DirectionalLight(color, intensity);
    light.position.set(...pos);
    scene.add(light);
    scene.add(light.target);
  }
  addLight(5, 5, 2);
  addLight(-5, 5, 5);

  const manager = new THREE.LoadingManager();
  manager.onLoad = init;

  const progressbarElem = document.querySelector('#progressbar');
  manager.onProgress = (url, itemsLoaded, itemsTotal) => {
    progressbarElem.style.width = `${itemsLoaded / itemsTotal * 100 | 0}%`;
  };

  const models = {
    pig:    { url: 'resources/models/animals/Pig.gltf' },
    cow:    { url: 'resources/models/animals/Cow.gltf' },
    llama:  { url: 'resources/models/animals/Llama.gltf' },
    pug:    { url: 'resources/models/animals/Pug.gltf' },
    sheep:  { url: 'resources/models/animals/Sheep.gltf' },
    zebra:  { url: 'resources/models/animals/Zebra.gltf' },
    horse:  { url: 'resources/models/animals/Horse.gltf' },
    knight: { url: 'resources/models/knight/KnightCharacter.gltf' },
  };
  {
    const gltfLoader = new THREE.GLTFLoader(manager);
    for (const model of Object.values(models)) {
      gltfLoader.load(model.url, (gltf) => {
        model.gltf = gltf;
      });
    }
  }

  function prepModelsAndAnimations() {
    Object.values(models).forEach(model => {
      const animsByName = {};
      model.gltf.animations.forEach((clip) => {
        animsByName[clip.name] = clip;
        // Should really fix this in .blend file
        if (clip.name === 'Walk') {
          clip.duration /= 2;
        }
      });
      model.animations = animsByName;
    });
  }

  // Keeps the state of keys/buttons
  //
  // You can check
  //
  //   inputManager.keys.left.down
  //
  // to see if the left key is currently held down
  // and you can check
  //
  //   inputManager.keys.left.justPressed
  //
  // To see if the left key was pressed this frame
  //
  // Keys are 'left', 'right', 'a', 'b', 'up', 'down'
  class InputManager {
    constructor() {
      this.keys = {};
      const keyMap = new Map();

      const setKey = (keyName, pressed) => {
        const keyState = this.keys[keyName];
        keyState.justPressed = pressed && !keyState.down;
        keyState.down = pressed;
      };

      const addKey = (keyCode, name) => {
        this.keys[name] = { down: false, justPressed: false };
        keyMap.set(keyCode, name);
      };

      const setKeyFromKeyCode = (keyCode, pressed) => {
        const keyName = keyMap.get(keyCode);
        if (!keyName) {
          return;
        }
        setKey(keyName, pressed);
      };

      addKey(37, 'left');
      addKey(39, 'right');
      addKey(38, 'up');
      addKey(40, 'down');
      addKey(90, 'a');
      addKey(88, 'b');

      window.addEventListener('keydown', (e) => {
        setKeyFromKeyCode(e.keyCode, true);
      });
      window.addEventListener('keyup', (e) => {
        setKeyFromKeyCode(e.keyCode, false);
      });

      const sides = [
        { elem: document.querySelector('#left'),  key: 'left'  },
        { elem: document.querySelector('#right'), key: 'right' },
      ];

      // note: not a good design?
      // The last direction the user presses should take
      // precedence. Example: User presses L, without letting go of
      // L user presses R. Input should now be R. User lets off R
      // Input should now be L.
      // With this code if user pressed both L and R result is nothing

      const clearKeys = () => {
        for (const {key} of sides) {
            setKey(key, false);
        }
      };

      const checkSides = (e) => {
        for (const {elem, key} of sides) {
          let pressed = false;
          const rect = elem.getBoundingClientRect();
          for (const touch of e.touches) {
            const x = touch.clientX;
            const y = touch.clientY;
            const inRect = x >= rect.left && x < rect.right &&
                           y >= rect.top && y < rect.bottom;
            if (inRect) {
              pressed = true;
            }
          }
          setKey(key, pressed);
        }
      };

      const uiElem = document.querySelector('#ui');
      uiElem.addEventListener('touchstart', (e) => {
        e.preventDefault();
        checkSides(e);
      }, {passive: false});
      uiElem.addEventListener('touchmove', (e) => {
        e.preventDefault();  // prevent scroll
        checkSides(e);
      }, {passive: false});
      uiElem.addEventListener('touchend', () => {
        clearKeys();
      });

      function handleMouseMove(e) {
        e.preventDefault();
        checkSides({
          touches: [e],
        });
      }

      function handleMouseUp() {
        clearKeys();
        window.removeEventListener('mousemove', handleMouseMove, {passive: false});
        window.removeEventListener('mouseup', handleMouseUp);
      }

      uiElem.addEventListener('mousedown', (e) => {
        // this is needed because we call preventDefault();
        // we also gave the canvas a tabindex so it can
        // become the focus
        canvas.focus();
        handleMouseMove(e);
        window.addEventListener('mousemove', handleMouseMove);
        window.addEventListener('mouseup', handleMouseUp);
      }, {passive: false});
    }
    update() {
      for (const keyState of Object.values(this.keys)) {
        if (keyState.justPressed) {
          keyState.justPressed = false;
        }
      }
    }
  }

  function removeArrayElement(array, element) {
    const ndx = array.indexOf(element);
    if (ndx >= 0) {
      array.splice(ndx, 1);
    }
  }

  class SafeArray {
    constructor() {
      this.array = [];
      this.addQueue = [];
      this.removeQueue = new Set();
    }
    get isEmpty() {
      return this.addQueue.length + this.array.length > 0;
    }
    add(element) {
      this.addQueue.push(element);
    }
    remove(element) {
      this.removeQueue.add(element);
    }
    forEach(fn) {
      this._addQueued();
      this._removeQueued();
      for (const element of this.array) {
        if (this.removeQueue.has(element)) {
          continue;
        }
        fn(element);
      }
      this._removeQueued();
    }
    _addQueued() {
      if (this.addQueue.length) {
        this.array.splice(this.array.length, 0, ...this.addQueue);
        this.addQueue = [];
      }
    }
    _removeQueued() {
      if (this.removeQueue.size) {
        this.array = this.array.filter(element => !this.removeQueue.has(element));
        this.removeQueue.clear();
      }
    }
  }

  class GameObjectManager {
    constructor() {
      this.gameObjects = new SafeArray();
    }
    createGameObject(parent, name) {
      const gameObject = new GameObject(parent, name);
      this.gameObjects.add(gameObject);
      return gameObject;
    }
    removeGameObject(gameObject) {
      this.gameObjects.remove(gameObject);
    }
    update() {
      this.gameObjects.forEach(gameObject => gameObject.update());
    }
  }

  const kForward = new THREE.Vector3(0, 0, 1);
  const globals = {
    time: 0,
    deltaTime: 0,
    moveSpeed: 16,
    camera,
  };
  const gameObjectManager = new GameObjectManager();
  const inputManager = new InputManager();

  class GameObject {
    constructor(parent, name) {
      this.name = name;
      this.components = [];
      this.transform = new THREE.Object3D();
      parent.add(this.transform);
    }
    addComponent(ComponentType, ...args) {
      const component = new ComponentType(this, ...args);
      this.components.push(component);
      return component;
    }
    removeComponent(component) {
      removeArrayElement(this.components, component);
    }
    getComponent(ComponentType) {
      return this.components.find(c => c instanceof ComponentType);
    }
    update() {
      for (const component of this.components) {
        component.update();
      }
    }
  }

  // Base for all components
  class Component {
    constructor(gameObject) {
      this.gameObject = gameObject;
    }
    update() {
    }
  }

  class CameraInfo extends Component {
    constructor(gameObject) {
      super(gameObject);
      this.projScreenMatrix = new THREE.Matrix4();
      this.frustum = new THREE.Frustum();
    }
    update() {
      const {camera} = globals;
      this.projScreenMatrix.multiplyMatrices(
          camera.projectionMatrix,
          camera.matrixWorldInverse);
      this.frustum.setFromMatrix(this.projScreenMatrix);
    }
  }

  class SkinInstance extends Component {
    constructor(gameObject, model) {
      super(gameObject);
      this.model = model;
      this.animRoot = THREE.SkeletonUtils.clone(this.model.gltf.scene);
      this.mixer = new THREE.AnimationMixer(this.animRoot);
      gameObject.transform.add(this.animRoot);
      this.actions = {};
    }
    setAnimation(animName) {
      const clip = this.model.animations[animName];
      // turn off all current actions
      for (const action of Object.values(this.actions)) {
        action.enabled = false;
      }
      // get or create existing action for clip
      const action = this.mixer.clipAction(clip);
      action.enabled = true;
      action.reset();
      action.play();
      this.actions[animName] = action;
    }
    update() {
      this.mixer.update(globals.deltaTime);
    }
  }

  class Player extends Component {
    constructor(gameObject) {
      super(gameObject);
      const model = models.knight;
      this.skinInstance = gameObject.addComponent(SkinInstance, model);
      this.skinInstance.setAnimation('Run');
      this.turnSpeed = globals.moveSpeed / 4;
      this.offscreenTimer = 0;
      this.maxTimeOffScreen = 3;
    }
    update() {
      const {deltaTime, moveSpeed} = globals;
      const {transform} = this.gameObject;
      const delta = (inputManager.keys.left.down  ?  1 : 0) +
                    (inputManager.keys.right.down ? -1 : 0);
      transform.rotation.y += this.turnSpeed * delta * deltaTime;
      transform.translateOnAxis(kForward, moveSpeed * deltaTime);

      const {frustum} = globals.cameraInfo;
      if (frustum.containsPoint(transform.position)) {
        this.offscreenTimer = 0;
      } else {
        this.offscreenTimer += deltaTime;
        if (this.offscreenTimer >= this.maxTimeOffScreen) {
          transform.position.set(0, 0, 0);
        }
      }
    }
  }

  function init() {
    // hide the loading bar
    const loadingElem = document.querySelector('#loading');
    loadingElem.style.display = 'none';

    prepModelsAndAnimations();

    {
      const gameObject = gameObjectManager.createGameObject(camera, 'camera');
      globals.cameraInfo = gameObject.addComponent(CameraInfo);
    }

    {
      const gameObject = gameObjectManager.createGameObject(scene, 'player');
      gameObject.addComponent(Player);
    }
  }

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  let then = 0;
  function render(now) {
    // convert to seconds
    globals.time = now * 0.001;
    // make sure delta time isn't too big.
    globals.deltaTime = Math.min(globals.time - then, 1 / 20);
    then = globals.time;

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    gameObjectManager.update();
    inputManager.update();

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

main();
</script>
</html>