/// <summary>
/// 设置一个固定点，转换矩阵变化后，计算出偏移值，使得固定点的值保持不变
/// </summary>
protected RectangleF CalculateOffset()
{
bool isBound = (DataBk.State == ControlState.BoundMove);
PointF oldPoint = Calculation.CalcFixPoint(DataBk, DataBk.FixRate, isBound);
PointF newPoint = Calculation.CalcFixPoint(this, DataBk.FixRate, isBound);
float xOff = oldPoint.X - newPoint.X + DataBk.Offset.X;
float yOff = oldPoint.Y - newPoint.Y + DataBk.Offset.Y;
return(Calculation.OffsetRect(NewRect, xOff, yOff, 0, 0));
}
