egret-docs-master/Engine3D/events/touchEvent

TouchEvent3D 触摸事件

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• 演示准备

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创建一个演示场景：
class Main {

    protected _egret3DCanvas: egret3d.Egret3DCanvas;
    protected view1: egret3d.View3D;
    protected cube: egret3d.Mesh;

    public constructor() {

        ///创建3DCanvas
        this._egret3DCanvas = new egret3d.Egret3DCanvas();
        this._egret3DCanvas.x = 0;
        this._egret3DCanvas.y = 0;
        this._egret3DCanvas.width = window.innerWidth;
        this._egret3DCanvas.height = window.innerHeight;
        this._egret3DCanvas.start();
        ///创建View3D
        this.view1 = new egret3d.View3D(0, 0, window.innerWidth, window.innerHeight);
        this.view1.camera3D.lookAt(new egret3d.Vector3D(0, 1000, -1000), new egret3d.Vector3D(0, 0, 0));
        this.view1.backColor = 0xff888888;
        this._egret3DCanvas.addView3D(this.view1);
        ///启动3DCanvas
        this._egret3DCanvas.start();
        ///创建立方体，放置于场景内(0,0,0)位置
        var mat_cube: egret3d.TextureMaterial = new egret3d.TextureMaterial();
        var geometery_Cube: egret3d.CubeGeometry = new egret3d.CubeGeometry();
        this.cube = new egret3d.Mesh(geometery_Cube, mat_cube);
        this.view1.addChild3D(this.cube);
        ///创建面片，放置于场景内(0,0,0)位置
        var mat_Plane: egret3d.TextureMaterial = new egret3d.TextureMaterial();
        var geometery_Plane: egret3d.PlaneGeometry = new egret3d.PlaneGeometry();
        var plane = new egret3d.Mesh(geometery_Plane, mat_Plane);
        this.view1.addChild3D(plane);

    }

}      

1) 触摸事件只能在手机上进行测试演示。
2）响应事件时的参数e: egret3d.TouchEvent3D，参数内数据说明：
	a) screenX:相对于用户屏幕水平偏移量，而screenY也就是垂直方向的，此时的参照点也就是原点是屏幕的左上角。
	b）clientX:跟screenX相比就是将参照点改成了浏览器内容区域的左上角，该参照点会随之滚动条的移动而移动。
	c) pageX：参照点也是浏览器内容区域的左上角，但它不会随着滚动条而变动
	b）canvasX:相对于Egret3DCanvas水平偏移量，而canvasY也就是垂直方向的，此时的参照点也就是原点是Egret3DCanvas的左上角。

3)示例代码：这是我们制作一个控制cube旋转的代码。

class Main {

    protected _egret3DCanvas: egret3d.Egret3DCanvas;
    protected view1: egret3d.View3D;

    private x_Cur: number = 0;
    private cube: egret3d.Mesh;

    public constructor() {
        ///创建3DCanvas
        this._egret3DCanvas = new egret3d.Egret3DCanvas();
        this._egret3DCanvas.x = 0;
        this._egret3DCanvas.y = 0;
        this._egret3DCanvas.width = window.innerWidth;
        this._egret3DCanvas.height = window.innerHeight;
        this._egret3DCanvas.start();
        ///创建View3D
        this.view1 = new egret3d.View3D(0, 0, window.innerWidth, window.innerHeight);
        this.view1.camera3D.lookAt(new egret3d.Vector3D(0, 1000, -1000), new egret3d.Vector3D(0, 0, 0));
        this.view1.backColor = 0xff888888;
        this._egret3DCanvas.addView3D(this.view1);
        ///启动3DCanvas，注册每帧更新事件
        this._egret3DCanvas.start();
        ///创建立方体，放置于场景内(0,0,0)位置
        var mat_cube: egret3d.TextureMaterial = new egret3d.TextureMaterial();
        var geometery_Cube: egret3d.CubeGeometry = new egret3d.CubeGeometry();
        this.cube = new egret3d.Mesh(geometery_Cube, mat_cube);
        this.view1.addChild3D(this.cube);
        ///创建面片，放置于场景内(0,0,0)位置
        var mat_Plane: egret3d.TextureMaterial = new egret3d.TextureMaterial();
        var geometery_Plane: egret3d.PlaneGeometry = new egret3d.PlaneGeometry();
        var plane = new egret3d.Mesh(geometery_Plane, mat_Plane);
        this.view1.addChild3D(plane);

        ///注册事件，持有对象为IRender，需要依次写入事件标识符，注册方法和注册对象。
        egret3d.Input.addEventListener(egret3d.TouchEvent3D.TOUCH_START, this.OnTouchStart, this);
        egret3d.Input.addEventListener(egret3d.TouchEvent3D.TOUCH_END, this.OnTouchEnd, this);
        egret3d.Input.addEventListener(egret3d.TouchEvent3D.TOUCH_MOVE, this.OnTouchMove, this);
        ///开启手机屏幕日志信息显示
        egret3d.Debug.instance.isDebug = true;
    }

    ///触摸开始事件。
    public OnTouchStart(e: egret3d.TouchEvent3D) {
        egret3d.Debug.instance.trace("OnTouchStart");
    }
    ///触摸结束事件
    public OnTouchEnd(e: egret3d.TouchEvent3D) {
        egret3d.Debug.instance.trace("OnTouchEnd");
    }
    ///触摸移动事件
    public OnTouchMove(e: egret3d.TouchEvent3D) {
        if (this.x_Cur - e.targetTouches[0].clientX > 0) {
            this.cube.rotationY += 4;
        } else {
            this.cube.rotationY -= 4;
        }
        this.x_Cur = e.targetTouches[0].clientX;
    }
}