public void MouseRotatePoint(PointF point)
{
PointF pf = Calculation.GetRotatePoint(DataBk.Matrix, point, DataBk.Rect);
if (_isFlipX)
{
pf.X = 1 - pf.X;
}
if (_isFlipY)
{
pf.Y = 1 - pf.Y;
}
SetRotatePoint(pf);
}