egret-docs-master/Engine3D/events/touchEvent
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README.md fist commit 2024-06-19 13:32:32 +08:00

README.md

TouchEvent3D 触摸事件


  • 演示准备

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。
	bclientX: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
	bcanvasX: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;
    }
}