How to differentiate between vertical and horizontal splitting of a view

Question

I'm working on the programming interface (public functions) to an API for graphical UI layout. The API does everything in terms of frame objects - simple rectangles in which stuff can be displayed.

I have methods to split these frames in half, either vertically or horizontally, but I'm having trouble coming up with an obvious name for the methods. SplitVertical, for example, could mean either:

1. split with a vertical line, leaving one half to each side
2. split into two halves which are arranged vertically (one above the other)

Is there a good way to resolve this ambiguity? Perhaps a more meaningful term?

Note: (to clear up some of the confusion) I am talking about the user interface that exists between the API programmer (myself) and the API end user (an application programmer), not the interface that the application programmers will create for their end users:

Answer 1

Not sure how well they fit the rest of your API, but how about these:

• Instead of SplitVertical(), how about DivideIntoColumns()
• Instead of SplitHorizontal(), how about DivideIntoRows()

Answer 2

If the application allows you, you could use icons with labels besides them. something like this: http://dl.dropbox.com/u/432554/ggf.png

or you could create a menu like: Split View: Horizontally | Vertically

But if you ask me, there's no ambiguity with using Split Vertical and Split Horizontal