How to draw a rotated image on another image ?

[Socolin]

Hello,

I'm trying to draw a rotated image on top of another one.

I found that it was kind of working through doing a Transform on the first image, then drawing it on the second image, but I having some issues, and I wondering if there is a better way, or if .DrawImage() could support the DrawingOption.Transform parameter too ?

The issue I'm still having are:

• I need to do a copy of the image first to add Alpha channel, otherwise the transform add black pixel around (which seems normal, but no efficient)
• When I rotate an image, the image grow, but the pixel of the image that get rotated outside the image area (on negative coordinate) disappear (On the left and on the top), I suppose I could start with a transform to move the image, but this make the image way bigger and increase memory consumption a lot on big images.