private void MyImage_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
//クリック位置取得
MyPoint = e.GetPosition(this);
//マウスがScrollViewer外になってもドラッグ移動を有効にしたいときだけ必要
MyImage.CaptureMouse();
}
private void MyImage_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
_PositionOnMouseDown = e.GetPosition(MyScrollViewer); // NOT using the position in MyImage
_ScrollOffsetsOnMouseDown = new Point(MyScrollViewer.HorizontalOffset, MyScrollViewer.VerticalOffset);
this.Cursor = Cursors.Hand;
MyImage.CaptureMouse();
}