c# - Crop Image in Aspect Fill UIImageView -


i have been trying figure out hours no answer.

i have uiimageview contentmode uiviewcontentmode.scaleaspectfill crop using overlying resizable frame. cropping frame no longer maintains 1:1 relationship between bounds contains both uiimageview , cropping tool. cropping simple as:

using (var imageref = image.cgimage.withimageinrect(frame)) {      return uiimage.fromimage(imageref); }

but, calculations required in case, how calculate offset match cropping tool frame newly inflated uiimageview (or rather uiimage)? here's image paint picture:

cropping tool frame

this picture shows few key things.

upper right image: cropped (area contained in blue section)

blue rectangle: cropping being taken place, notice position , height skewed compared red.

red rectangle: cropping control, cropping should taking place. instead of blue is.

upper blue textbox: ignore this.

essentially, want blue rect red frame is.

any appeciated, using c# this, objective c answers more welcomed.


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