WPF 移动图像

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private void Boutsidewrapper_PreviewMouseMove(object sender, System.Windows.Input.MouseEventArgs e)         {             if (BleftDown)             {                 if (BisTranslateStart)                 {                     Point currentPoint = e.GetPosition(Boutside);  //不能用 inside，必须用outside                     Vector v = currentPoint - BpreviousPoint;                     TransformGroup tg = Binside.RenderTransform as TransformGroup;                     tg.Children.Add(new TranslateTransform(v.X, v.Y));  //centerX和centerY用外部包装元素的坐标，不能用内部被变换的Canvas元素的坐标                                                                         //    inside.RenderTransform = tg;                     BpreviousPoint = currentPoint;                 }                   e.Handled = true;             }         }         bool BleftDown;         Point BpreviousPoint;         bool BisTranslateStart = false;         double Boldscalimg = 0, Bscalimg = 1, Bscavs = 0;         double Bimgx = 0, Bimgy = 0;             private void Boutside_PreviewMouseUp(object sender, MouseButtonEventArgs e)         {             if (BleftDown)             {                 if (BisTranslateStart)                 {                     BisTranslateStart = false;                 }                 e.Handled = true;             }         }           private void Boutside_PreviewMouseWheel(object sender, MouseWheelEventArgs e)         {             Point currentPoint = e.GetPosition(Boutside);  //不能用 inside，必须用outside             TransformGroup tg = Binside.RenderTransform as TransformGroup;             Bscavs = ((double)e.Delta) / 1000.0 + 1.0;             Boldscalimg = Bscalimg;             Bscalimg = Bscalimg * Bscavs;             if (Bscalimg < 0.8)             {                 Bscavs = 1;                 Bscalimg = Boldscalimg;             }             else if (Bscalimg > 2)             {                 Bscavs = 1;                 Bscalimg = Boldscalimg;             }             //centerX和centerY用外部包装元素的坐标，不能用内部被变换的Canvas元素的坐标             tg.Children.Add(new ScaleTransform(Bscavs, Bscavs, currentPoint.X, currentPoint.Y));             e.Handled = true;         }           private void Boutsidewrapper_PreviewMouseDown(object sender, MouseButtonEventArgs e)         {             if (e.LeftButton == MouseButtonState.Pressed)             {                 BleftDown = true;                 BpreviousPoint = e.GetPosition(Boutside);                 BisTranslateStart = true;                 e.Handled = true;             }             else             {                 BleftDown = false;             }         }