[RESOLVED] Semitransparent graphic objects

[krtxmrtz]

In a picturebox I have a number of geometric figures, basically rectangles and one polygon creted by means of the Polygon, CreatePolygonRgn and Rectangle functions. The polygon may overlap the rectangles and I would like to plot it semitransparent where the overlapping region occurs. I thought of plotting the rectangles in an invisible picturebox, the polygon in another and then Alphablending them to a visible picturebox. But I wonder if this is appropriate as it would blend the background as well as the polygon.

Any other way to do it?

[jmsrickland]

Make the background white if that is what you are referring to

[krtxmrtz]

I finally used the API function SetROP2 with the R2_MASKPEN parameter and this produced a very reasonable effect, much more straightforward than the Alphablend alternative.