112 lines
4.6 KiB
Markdown
112 lines
4.6 KiB
Markdown
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帧事件
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* 演示准备
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----------
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创建一个演示场景：
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class Main {
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protected _egret3DCanvas: egret3d.Egret3DCanvas;
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protected view1: egret3d.View3D;
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protected cube: egret3d.Mesh;
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public constructor() {
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///创建3DCanvas
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this._egret3DCanvas = new egret3d.Egret3DCanvas();
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this._egret3DCanvas.x = 0;
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this._egret3DCanvas.y = 0;
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this._egret3DCanvas.width = window.innerWidth;
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this._egret3DCanvas.height = window.innerHeight;
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this._egret3DCanvas.start();
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///创建View3D
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this.view1 = new egret3d.View3D(0, 0, window.innerWidth, window.innerHeight);
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this.view1.camera3D.lookAt(new egret3d.Vector3D(0, 1000, -1000), new egret3d.Vector3D(0, 0, 0));
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this.view1.backColor = 0xff888888;
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this._egret3DCanvas.addView3D(this.view1);
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///启动3DCanvas
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this._egret3DCanvas.start();
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///创建立方体，放置于场景内(0,0,0)位置
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var mat_cube: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Cube: egret3d.CubeGeometry = new egret3d.CubeGeometry();
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this.cube = new egret3d.Mesh(geometery_Cube, mat_cube);
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this.view1.addChild3D(this.cube);
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///创建面片，放置于场景内(0,0,0)位置
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var mat_Plane: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Plane: egret3d.PlaneGeometry = new egret3d.PlaneGeometry();
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var plane = new egret3d.Mesh(geometery_Plane, mat_Plane);
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this.view1.addChild3D(plane);
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}
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}
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1) 该事件的持有对象为egret3d.Egret3DCanvas对象，所以注册该事件应该如示例代码所示：
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this._egret3DCanvas.addEventListener(egret3d.Event3D.ENTER_FRAME, this.OnUpdate, this);
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2）事件触发时，注册函数会传递一个类型为egret3d.Event3D的参数，其中egret3d.Event3D.delay为每帧间隔延时，egret3d.Event3D.time为当前时间戳；
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3) 示例代码：
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通过每帧更新控制cube进行x轴水平运动。
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class Main {
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protected _egret3DCanvas: egret3d.Egret3DCanvas;
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protected view1: egret3d.View3D;
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protected cube: egret3d.Mesh;
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private cur_x: number;
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private radio: number = 1;;
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public constructor() {
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///创建3DCanvas
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this._egret3DCanvas = new egret3d.Egret3DCanvas();
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this._egret3DCanvas.x = 0;
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this._egret3DCanvas.y = 0;
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this._egret3DCanvas.width = window.innerWidth;
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this._egret3DCanvas.height = window.innerHeight;
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this._egret3DCanvas.start();
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///创建View3D
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this.view1 = new egret3d.View3D(0, 0, window.innerWidth, window.innerHeight);
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this.view1.camera3D.lookAt(new egret3d.Vector3D(0, 1000, -1000), new egret3d.Vector3D(0, 0, 0));
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this.view1.backColor = 0xff888888;
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this._egret3DCanvas.addView3D(this.view1);
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///启动3DCanvas，注册每帧更新事件
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this._egret3DCanvas.start();
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///创建立方体，放置于场景内(0,0,0)位置
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var mat_cube: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Cube: egret3d.CubeGeometry = new egret3d.CubeGeometry();
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this.cube = new egret3d.Mesh(geometery_Cube, mat_cube);
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this.view1.addChild3D(this.cube);
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///创建面片，放置于场景内(0,0,0)位置
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var mat_Plane: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Plane: egret3d.PlaneGeometry = new egret3d.PlaneGeometry();
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var plane = new egret3d.Mesh(geometery_Plane, mat_Plane);
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this.view1.addChild3D(plane);
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///注册事件，持有对象为_egret3DCanvas，每帧触发该注册方法，需要依次写入事件标识符，注册方法和注册对象。
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this._egret3DCanvas.addEventListener(egret3d.Event3D.ENTER_FRAME, this.OnUpdate, this);
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}
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///注册后，该事件将每帧响应
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public OnUpdate(e: egret3d.Event3D) {
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var speed = 0.04;
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///我们这里简单的控制cube的x值来进行水平位移动画
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///限制x的运动范围为-200至200之间。
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if (this.cube.x > 200) {
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this.radio = -1;
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} else if (this.cube.x < -200) {
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this.radio = 1;
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}
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///通过速度和每帧间隔时长计算位移，radio是位移方向系数。
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this.cube.x += speed * e.delay * this.radio;
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}
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}
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