Tip: Use SaveDC / RestoreDC |
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Please note - PDF does not offer a possibility to reset the current coordinate transformation. So our PDF engine has to create a complicated conversation vector to reset to default, in case your programming code demands it. This conversion vector seems to make Acrobat 5 trouble if also a rotation is involved.
So we recommend to use SaveDC / RestoreDC, it is available in .NET as Graphics.Save and Graphics.Restore
Example:
void DrawSomething(Graphics g, ....) { System.Drawing.Drawing2D.GraphicsState saved = g.Save();//= SaveDC try {
...
// not required since we use RestoreDC: // g.ResetTransform(); // g.PageUnit = OrigGraphicsUnit; } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { g.Restore(saved);// = RestoreDC } } }
SaveDC / RestoreDC is also useful when working with clipping rectangles. It is not required for the Clipping Paths which make their own brackets. |