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CGAffineTransformConCat seems to be missing from the API.
I have checked this and I am able to reproduce this issue.
I observed that "CGAffineTransformConCat" method is missing from the "CGAffineTransform" structure. I have also checked the signature of "CGAffineTransform" structure under "MonoTouch.CoreGraphics" library in "assembly browser" (View->Assembly browser) but I am not able to find it.
It is available in apple doc : https://developer.apple.com/library/mac/documentation/graphicsimaging/reference/CGAffineTransform/Reference/reference.html#//apple_ref/c/func/CGAffineTransformInvert
Xamarin Studio: 4.2.3 (build 60)
Please let me know if I am missing something.
From Apple's documentation about CGAffineTransformConcat:
"Concatenation combines two affine transformation matrices by multiplying them together."
The multiplication operator is overridden, so you can do this:
CGAffineTransform a, b;
CGAffineTransform result = a * b;
Does that work for you?
No answer, I'll assume it's fine (since `concat` is a multiplication).