1

egret/src/Ball.ts

 import { addImage } from "./utils";
+import { FACTOR } from "./consts";
 
 export default class Ball extends p2.Body {
     _skin: egret.DisplayObject;
-    constructor(options?: any) {
-        super(options);
-        this.init();
-    }
 
-    private init() {
+    init() {
         this._skin = addImage('ball_png');
         this._skin.anchorOffsetX = this._skin.width / 2;
         this._skin.anchorOffsetY = this._skin.height / 2;
 
-        const radius = this._skin.width / 2;
+        const radius = this._skin.width / 2 / FACTOR;
         const shape = new p2.Circle({ radius: radius });
         this.addShape(shape);
 
@@ -20,8 +17,8 @@ export default class Ball extends p2.Body {
     }
 
     updateSkin() {
-        this._skin.x = this.position[0];
-        this._skin.y = this.position[1];
+        this._skin.x = this.position[0] * FACTOR;
+        this._skin.y = this.position[1] * FACTOR;
         this._skin.rotation = this.angle * 180 / Math.PI;
     }
 

egret/src/Gun.ts

@@ -23,6 +23,7 @@ export default class Gun extends egret.Sprite {
 
     addBall() {
         const ball = new Ball();
+        ball.init();
         this._world.addBody(ball);
         this._root.addChild(ball.skin);
     }

egret/src/Main.ts

@@ -29,7 +29,7 @@ export class Main extends eui.UILayer {
     }
 
     loop() {
-        this._world.step(1 / 60);
+        this._world.step(1);
         this._world.loop();
     }