1

egret/src/Ball.ts

@@ -3,8 +3,14 @@ import { FACTOR } from "./consts";
 
 export default class Ball extends p2.Body {
     _skin: egret.DisplayObject;
+    setImpulse: boolean;
+    constructor() {
+        super({ mass: 10 });
+        this.type = p2.Body.DYNAMIC;
+        this.init();
+    }
 
-    init() {
+    private init() {
         this._skin = addImage('ball_png');
         this._skin.anchorOffsetX = this._skin.width / 2;
         this._skin.anchorOffsetY = this._skin.height / 2;
@@ -13,7 +19,7 @@ export default class Ball extends p2.Body {
         const shape = new p2.Circle({ radius: radius });
         this.addShape(shape);
 
-        this.mass = 1;
+        shape.collisionGroup = 2;//010与001为0，010与110为1
     }
 
     updateSkin() {

egret/src/Brick.ts

+import { addImage } from "./utils";
+import { FACTOR } from "./consts";
+
+/**
+ * 被打的砖块
+ */
+export default class Brick extends p2.Body {
+    _skin: egret.DisplayObject;
+    constructor() {
+        super();
+        this.type = p2.Body.KINEMATIC;
+        this.init();
+    }
+
+    init() {
+        this._skin = addImage('rect1_png');
+        this._skin.anchorOffsetX = this._skin.width / 2;
+        this._skin.anchorOffsetY = this._skin.height / 2;
+
+        const width = this._skin.width / FACTOR;
+        const height = this._skin.height / FACTOR;
+        const shape = new p2.Box({ width: width, height: height });
+        this.addShape(shape);
+
+        shape.collisionMask = 6;//010与001为0，010与110为1
+    }
+
+    updateSkin() {
+        this._skin.x = this.position[0] * FACTOR;
+        this._skin.y = this.position[1] * FACTOR;
+        this._skin.rotation = this.angle * 180 / Math.PI;
+    }
+
+    get skin() { return this._skin }
+}
\ No newline at end of file

egret/src/Gun.ts

 import { addImage } from "./utils";
 import Ball from "./Ball";
 import World from "./World";
+import { FACTOR } from "./consts";
+import Brick from "./Brick";
 
 export default class Gun extends egret.Sprite {
     _root: egret.DisplayObjectContainer;
     _world: World;
     _line: egret.Bitmap;
     _gun: egret.Bitmap;
+    vec: egret.Point
     constructor(root: egret.DisplayObjectContainer, world: World) {
         super();
         this._root = root;
@@ -14,18 +17,28 @@ export default class Gun extends egret.Sprite {
         this.initUI();
     }
 
-    fire() {
+    fire(vec: egret.Point) {
         egret.Tween.get(this._gun)
             .to({ scaleY: 0.6 }, 100)
             .to({ scaleY: 1 }, 100);
-        this.addBall();
+        const ball = this.addBall();
+        ball.mass = 0;
+        this._world.bodies.forEach(body => {
+            if (body instanceof Brick) {
+                this._world.setMaterial(ball, body);
+            }
+        })
+        ball.applyImpulse([vec.x, vec.y], [0, 0]);
     }
 
     addBall() {
         const ball = new Ball();
-        ball.init();
+        ball.position = [this.x / FACTOR, this.y / FACTOR];
+        ball.skin.x = this.x;
+        ball.skin.y = this.y;
         this._world.addBody(ball);
-        this._root.addChild(ball.skin);
+        this._world.skin.addChild(ball.skin);
+        return ball;
     }
 
     enable() {
@@ -39,10 +52,19 @@ export default class Gun extends egret.Sprite {
         this.stage.once(egret.TouchEvent.TOUCH_END, this.onTouchEnd, this);
     }
 
-    onTouchEnd(): any {
+    onTouchEnd(e: egret.TouchEvent): any {
         this.hideLine();
         this.stage.removeEventListener(egret.TouchEvent.TOUCH_MOVE, this.onTouchMove, this);
-        // this.fire();
+
+        const point = new egret.Point(e.stageX, e.stageY)
+        var pos = new egret.Point(point.x - this.x, point.y - this.y);
+        var angle: number = Math.atan2(pos.x, pos.y)
+        var dis: number = 10000;
+        var x: number = Math.ceil(Math.sin(angle) * dis);
+        var y: number = Math.ceil(Math.cos(angle) * dis);
+        const vec = new egret.Point(x, y);
+        this.vec = vec;
+        this.fire(vec);
     }
 
     onTouchMove(e: egret.TouchEvent) {

egret/src/Main.ts

 import { getResPath } from "./utils";
 import Gun from "./Gun";
 import World from "./World";
+import Brick from "./Brick";
+import { FACTOR } from "./consts";
 
 export class Main extends eui.UILayer {
     private _gun: Gun;
     private _world: World;
     protected createGameScene(): void {
-        this._world = new World(this);
+        this._world = new World();
         this._gun = new Gun(this, this._world);
+        this._world.gun = this._gun;
+        this._world.skin = new egret.Sprite();
+
+        this.addChild(this._world.skin);
         this.addChild(this._gun);
+
         this._gun.x = this.stage.stageWidth >> 1;
         this._gun.y = 100;
         this._gun.enable();
 
-        setInterval(() => {
-            this._gun.fire();
-        }, 500);
+
+        this.updateBrickBody();
 
         //添加游戏帧频事件
         this.addEventListener(egret.Event.ENTER_FRAME, this.loop, this);
     }
 
+    updateBrickBody(): void {
+        for (var i = 0; i < 1; i++) {
+            var brick = new Brick();
+            var x = this.stage.stageWidth >> 1;
+            var y = 1000;
+            brick.position = [x / FACTOR, y / FACTOR];
+            brick.updateSkin();
+            brick.angle = (-Math.random() * Math.PI / 4) + (Math.random() * Math.PI / 4);
+            this._world.skin.addChild(brick.skin);
+            this._world.addBody(brick);
+        }
+    }
+
     protected createChildren(): void {
         super.createChildren();
         this.runGame().catch(e => {
@@ -29,7 +48,7 @@ export class Main extends eui.UILayer {
     }
 
     loop() {
-        this._world.step(1);
+        this._world.step(1 / 60);
         this._world.loop();
     }
 

egret/src/World.ts

 import Ball from "./Ball";
+import Gun from "./Gun";
 
 export default class World extends p2.World {
-    _root: egret.DisplayObjectContainer;
-    constructor(root: egret.DisplayObjectContainer, options?: any) {
+    material: p2.Material;//碰撞时的弹性变化
+    _skin: egret.DisplayObjectContainer;
+    gun: Gun;
+    constructor(options?: any) {
         super(options);
-        this._root = root;
         this.init();
     }
 
+    protected onHitBegin(evt): void {
+        var ball: Ball;
+        if (evt.bodyA instanceof Ball) ball = evt.bodyA;
+        if (evt.bodyB instanceof Ball) ball = evt.bodyB;
+        if (ball && ball.mass == 0) {
+            ball.setImpulse = true;//可以设置给小球冲量
+            ball.mass = 200;
+        }
+
+        if (ball && ball.setImpulse) {
+            const vec = this.gun.vec;
+            ball.applyImpulse([vec.x * 2, vec.y], [0, 0]);
+            ball.setImpulse = false;
+        }
+    }
+
+    /** 
+     * 设置刚体碰撞的弹性
+     * */
+    setMaterial(body1: p2.Body, body2: p2.Body): void {
+        body1.shapes[0].material = this.material;
+        body2.shapes[0].material = this.material;
+        var roleAndStoneMaterial = new p2.ContactMaterial(
+            this.material, this.material,
+            { restitution: 0.7, friction: 0 });//弹性，摩擦力
+        this.addContactMaterial(roleAndStoneMaterial);
+    }
+
     loop(): any {
         this.bodies.forEach(body => {
             if (body instanceof Ball) {
@@ -17,6 +47,11 @@ export default class World extends p2.World {
     }
 
     init() {
-        this.gravity = [0, 10];
+        this.gravity = [0, 200];
+        this.material = new p2.Material(0);
+        this.on("beginContact", this.onHitBegin.bind(this));
     }
+
+    set skin(val: egret.DisplayObjectContainer) { this._skin = val }
+    get skin() { return this._skin }
 }
\ No newline at end of file

egret/src/consts.ts

-export const FACTOR = 30;
+export const FACTOR = 1;
\ No newline at end of file
+// export const FACTOR = 30;
\ No newline at end of file