修复box因缺少初始化报错问题

source/src/Physics/Shapes/Box.ts

@@ -3,6 +3,24 @@ class Box extends Polygon {
     public width: number;
     public height: number;
 
+    constructor(width: number, height: number){
+        super(Box.buildBox(width, height), true);
+        this.width = width;
+        this.height = height;
+    }
+
+    private static buildBox(width: number, height: number): Vector2[]{
+        let halfWidth = width / 2;
+        let halfHeight = height / 2;
+        let verts = new Array(4);
+        verts[0] = new Vector2(-halfWidth, -halfHeight);
+        verts[1] = new Vector2(halfWidth, -halfHeight);
+        verts[2] = new Vector2(halfWidth, halfHeight);
+        verts[3] = new Vector2(-halfWidth, halfHeight);
+
+        return verts;
+    }
+
     public updateBox(width: number, height: number){
         this.width = width;
         this.height = height;

source/src/Physics/Shapes/Polygon.ts

@@ -14,9 +14,11 @@ class Polygon extends Shape {
     }
     public isBox: boolean;
 
-    constructor(vertCount: number, radius: number) {
+    constructor(points: Vector2[], isBox?: boolean){
         super();
-        this.setPoints(Polygon.buildSymmertricalPolygon(vertCount, radius));
+
+        this.setPoints(points);
+        this.isBox = isBox;
     }
 
     private buildEdgeNormals(){
@@ -42,8 +44,10 @@ class Polygon extends Shape {
         this.points = points;
         this.recalculateCenterAndEdgeNormals();
 
-        this._originalPoints = new Array(this.points.length);
-        this.points.forEach(point => this._originalPoints.push(point));
+        this._originalPoints = [];
+        for (let i = 0; i < this.points.length; i ++){
+            this._originalPoints.push(this.points[i]);
+        }
     }
 
     public collidesWithShape(other: Shape){