how to realise face alignment?

Recently,I have been read your code!The code has realise 68 feature landmarks alignment,but the whole face don't follow the 68 feature landmarks aligement to realise face alignment.How to realise it?And I found rotateshape function,And how to use the rotate function in the code? I found the globalprediction.m function don't have the rotateshape function,Whether to need the function?And how to use it?
I need some help!Thanks very much!