GDAL is a pretty cool opensource library that will do affine transformations. And it looks like you can use it with IOS projects. So you might want to check tha

GDAL is a pretty cool opensource library that will do affine transformations. And it looks like you can use it with IOS projects. So you might want to check that out. http://stackoverflow.com/questions/12643898/incorporating-gdal-ogr-into-an-ios-project-a-quick-guide http://stackoverflow.com/questions/12643898/incorporating-gd...