寻找关于post/pre/set Translate的解释(在Matrix对象中)以及如何使用它们。

The documentation is pretty vague as to what is actually happening when these methods are used. Can someone explain how Matrix actually affects the Bitmap that it's being set to? They use the term concatenate in there, but I'm unclear on how that term applies to coordinate data (having only used it in regard to string manipulation before). is pretty vague as to what is