private void RsImageMouseLeftButtonDown(object sender, MouseButtonEventArgs e) { if (RsImage.IsMouseCaptured) { return; } RsImage.CaptureMouse(); _mouseStart = e.GetPosition(border); _mouseOri.X = RsImage.RenderTransform.Value.OffsetX; _mouseOri.Y = RsImage.RenderTransform.Value.OffsetY; }