translate(): “preconcat the current matrix with the specified translation” — what does this mean?
I can’t find a good definition of “preconcat” anywhere on the internet! The only place I can find it is in the Android Source – I’m starting to wonder if they made it up? 🙂
I’m familiar with “concat” or concatenate, which is to append to, so what is a pre-concat?
When working with matrices, the word concatenation refers to multiplication.
Since matrix multiplication is not commutative, there is a separate word for backwards multiplication.
b means setting
a = b × a. (As opposed to
a = a × b, which will give a different matrix)