174 lines
7.7 KiB
Markdown
174 lines
7.7 KiB
Markdown
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PickEvent3D拣选事件
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----------
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* 演示准备
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----------
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创建一个演示场景，其中我们定义了abc三个不通的cube：
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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_A: egret3d.Mesh;
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protected cube_B: egret3d.Mesh;
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protected cube_C: 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A，放置于场景内(100,0,0)位置
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var mat_cube_A: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Cube_A: egret3d.CubeGeometry = new egret3d.CubeGeometry();
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this.cube_A = new egret3d.Mesh(geometery_Cube_A, mat_cube_A);
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this.cube_A.x = 100;
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this.cube_A.name = "A";
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this.view1.addChild3D(this.cube_A);
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///创建立方体B，放置于场景内(0,0,0)位置
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var mat_cube_B: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Cube_B: egret3d.CubeGeometry = new egret3d.CubeGeometry();
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this.cube_B = new egret3d.Mesh(geometery_Cube_B, mat_cube_B);
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this.cube_B.x = 0;
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this.cube_B.name = "B";
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this.view1.addChild3D(this.cube_B);
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///创建立方体B，放置于场景内(-100,0,0)位置
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var mat_cube_C: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Cube_C: egret3d.CubeGeometry = new egret3d.CubeGeometry();
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this.cube_C = new egret3d.Mesh(geometery_Cube_C, mat_cube_C);
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this.cube_C.x = -100;
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this.cube_C.name = "C";
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this.view1.addChild3D(this.cube_C);
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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) Pick事件是引擎中可操作物体拣选事件。
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2）需要注册对象IRender，开启enablePick后才能监听了PickEvent3D事件，触摸和鼠标点选都是可以触发该事件的。
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3) Pick事件可以分为PICK_CLICK（点击拣选事件），PICK_DOWN（按下拣选事件），PICK_UP（弹起拣选事件），PICK_MOVE（光标移动拣选事件）和
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PICK_WHEEL（滚轮滚动拣选事件）。
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4) 示例代码：我们这里书写一个测试Pick事件的代码，选中的cube将变为红色。
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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_A: egret3d.Mesh;
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protected cube_B: egret3d.Mesh;
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protected cube_C: egret3d.Mesh;
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protected cube_Pick: 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A，放置于场景内(100,0,0)位置
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var mat_cube_A: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Cube_A: egret3d.CubeGeometry = new egret3d.CubeGeometry();
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this.cube_A = new egret3d.Mesh(geometery_Cube_A, mat_cube_A);
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this.cube_A.x = 100;
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this.cube_A.name = "A";
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this.view1.addChild3D(this.cube_A);
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///创建立方体B，放置于场景内(0,0,0)位置
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var mat_cube_B: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Cube_B: egret3d.CubeGeometry = new egret3d.CubeGeometry();
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this.cube_B = new egret3d.Mesh(geometery_Cube_B, mat_cube_B);
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this.cube_B.x = 0;
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this.cube_B.name = "B";
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this.view1.addChild3D(this.cube_B);
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///创建立方体B，放置于场景内(-100,0,0)位置
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var mat_cube_C: egret3d.TextureMaterial = new egret3d.TextureMaterial();
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var geometery_Cube_C: egret3d.CubeGeometry = new egret3d.CubeGeometry();
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this.cube_C = new egret3d.Mesh(geometery_Cube_C, mat_cube_C);
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this.cube_C.x = -100;
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this.cube_C.name = "C";
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this.view1.addChild3D(this.cube_C);
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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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///开启拣选功能
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this.cube_A.enablePick = true;
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this.cube_B.enablePick = true;
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this.cube_C.enablePick = true;
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///给Cube注册事件。
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this.cube_A.addEventListener(egret3d.PickEvent3D.PICK_CLICK, this.OnPickClick, this);
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this.cube_A.addEventListener(egret3d.PickEvent3D.PICK_DOWN, this.OnPickDown, this);
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this.cube_A.addEventListener(egret3d.PickEvent3D.PICK_UP, this.OnPickUp, this);
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this.cube_B.addEventListener(egret3d.PickEvent3D.PICK_CLICK, this.OnPickClick, this);
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this.cube_B.addEventListener(egret3d.PickEvent3D.PICK_DOWN, this.OnPickDown, this);
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this.cube_B.addEventListener(egret3d.PickEvent3D.PICK_UP, this.OnPickUp, this);
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this.cube_C.addEventListener(egret3d.PickEvent3D.PICK_CLICK, this.OnPickClick, this);
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this.cube_C.addEventListener(egret3d.PickEvent3D.PICK_DOWN, this.OnPickDown, this);
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this.cube_C.addEventListener(egret3d.PickEvent3D.PICK_UP, this.OnPickUp, this);
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}
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///pick点击事件，这里我们只输出点选日志信息。
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public OnPickClick(e: egret3d.PickEvent3D) {
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var mesh: egret3d.Mesh = e.target;
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///相交面索引
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var faceIndex = e.pickResult.faceIndex;
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///pick的世界坐标
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var pos = e.pickResult.globalPosition;
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///这里我们将信息输出
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console.log("OnPickClick:" + " Name:" + mesh.name + " faceIndex:" + faceIndex + " pos:" + pos.x + "," + pos.y + "," + pos.z);
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}
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///pick按下事件，这里我们只输出点选日志信息
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public OnPickDown(e: egret3d.PickEvent3D) {
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console.log("OnPickDown");
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if (this.cube_Pick != null) {
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///将上次pick对象设置为白色
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this.cube_Pick.material.diffuseColor = 0xffffff;
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}
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///设置选中对象为红色
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this.cube_Pick = e.target;
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this.cube_Pick.material.diffuseColor = 0xff0000;
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}
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///pick回弹事件，这里我们只输出点选日志信息
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public OnPickUp(e: egret3d.PickEvent3D) {
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console.log("OnPickUp");
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}
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}
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