优化spriteRenderer渲染方法

source/src/Math/Matrix2D.ts

@@ -155,8 +155,13 @@ class Matrix2D {
         return result;
     }
 
-    public static createTranslation(xPosition: number, yPosition: number, result?: Matrix2D){
-        result = result ? result : new Matrix2D();
+    /**
+     * 创建一个新的tranlation
+     * @param xPosition 
+     * @param yPosition 
+     */
+    public static createTranslation(xPosition: number, yPosition: number){
+        let result = new Matrix2D();
         
         result.m11 = 1;
         result.m12 = 0;
@@ -170,6 +175,14 @@ class Matrix2D {
         return result;
     }
 
+    /**
+     * 根据position 创建一个translation
+     * @param position 
+     */
+    public static createTranslationVector(position: Vector2){
+        return this.createTranslation(position.x, position.y);
+    }
+
     public static createRotation(radians: number, result?: Matrix2D){
         result = new Matrix2D();