#21 新增gapXY用于平铺/滚动间距

source/src/ECS/Components/TiledSpriteRenderer.ts

@@ -1,6 +1,7 @@
 ///<reference path="./SpriteRenderer.ts" />
 module es {
     import Bitmap = egret.Bitmap;
+    import RenderTexture = egret.RenderTexture;
 
     /**
      * 滚动由两张图片组合而成
@@ -89,9 +90,35 @@ module es {
             this._sourceRect.height = value;
         }
 
+        public get gapXY(): Vector2{
+            return new Vector2(this._gapX, this._gapY);
+        }
+
+        public set gapXY(value: Vector2){
+            if (value.x < 0 || value.y < 0){
+                console.error("间隔必须为正数");
+                return;
+            }
+
+            this._gapX = value.x;
+            this._gapY = value.y;
+
+            let renderTexture = new RenderTexture();
+            let newRectangle = this.sprite.sourceRect;
+            newRectangle.x = 0;
+            newRectangle.y = 0;
+            newRectangle.width += this._gapX;
+            newRectangle.height += this._gapY;
+            renderTexture.drawToTexture(this.displayObject, newRectangle);
+
+            this.displayObject = new Bitmap(renderTexture);
+        }
+
         protected _sourceRect: Rectangle;
         protected _textureScale = Vector2.one;
         protected _inverseTexScale = Vector2.one;
+        private _gapX = 0;
+        private _gapY = 0;
 
         constructor(sprite: Sprite) {
             super(sprite);

source/src/Math/Vector2.ts

@@ -154,6 +154,17 @@ module es {
             return Math.sqrt((v1 * v1) + (v2 * v2));
         }
 
+        /**
+         * 返回两个向量之间的角度，单位是度数
+         * @param from
+         * @param to
+         */
+        public static angle(from: Vector2, to: Vector2): number{
+            from = Vector2.normalize(from);
+            to = Vector2.normalize(to);
+            return Math.acos(MathHelper.clamp(Vector2.dot(from, to), -1, 1)) * MathHelper.Rad2Deg;
+        }
+
         /**
          * 矢量反演的结果
          * @param value