canvas 画图中，怎么移动用path创建的ShapeDrawable 对象呢？

Question

如题，怎么移动用path创建的ShapeDrawable 对象比较高效呢？ 
下面的代码貌似是通过更新path来移动的，这样每次画图都要重新创建ShapeDrawable 对象，非常浪费资源，有什么办法不？
 private void drawBitmapShape(Canvas canvas, Paint paint)
    {
      /*画一个空心三角形*/
        Path path=new Path();
        path.moveTo(10, 330);
        path.lineTo(70,330);
        path.lineTo(40,270);
        path.close();
        //canvas.drawPath(path, paint);     /* 构建ShapeDrawable对象并定义形状为椭圆 */
mShape = new ShapeDrawable(new PathShape(path, BitQQheight, BitQQheight)); /* 设置要绘制的椭圆形的东西为ShapeDrawable图片 */
mShape.getPaint().setShader(mBitmapShader);
/* 设置显示区域 */
//BitQQheight=BitQQheight*2;
mShape.setBounds(0,0, BitQQwidth, BitQQheight);

/* 绘制ShapeDrawableQQ */
mShape.draw(canvas);
    }

Answer 1

吼吼，解决了：
private void drawBitmapShape(Canvas canvas, Paint paint)
    {
     canvas.save();
     canvas.translate(5, 5);
// rotate
//canvas.rotate(90, 60, 310);
      /*画一个空心三角形*/
        Path path=new Path();
        path.moveTo(10, 330);
        path.lineTo(70,330);
        path.lineTo(40,270);
        path.close();
        //canvas.drawPath(path, paint);     /* 构建ShapeDrawable对象并定义形状为椭圆 */
mShape = new ShapeDrawable(new PathShape(path, BitQQheight, BitQQheight)); /* 设置要绘制的椭圆形的东西为ShapeDrawable图片 */
mShape.getPaint().setShader(mBitmapShader);
/* 设置显示区域 */
//BitQQheight=BitQQheight*2;
mShape.setBounds(0,0, BitQQwidth, BitQQheight);

/* 绘制ShapeDrawableQQ */
mShape.draw(canvas);
canvas.restore();
    }