Graphics Function Arguments?!

I want to write a function but I need help defining the function arguments.

I know that sounds easy but read on!

In particular, I want the arguments to be like the graphics functions arguments. For instance:

picturebox1.line (x1,y1)-(x2,y2),colorref&

How the heck do you program (x1,y1)-(x2,y2) in a function declaration.

Here's what I'm doing...

I want to create a WMF object that acts like a picturebox or printer object. That way, I can declare a generic object and use latebinding to display a graphic, or print a graphic, or SAVE a graphic in WMF format.

So I need some way to do the following:

dim wmfob as new wmfobject

wmfob.line (x1,y1)-(x2,y2)

I can create most of the object but the line, circle and move methods use this odd syntax.

TIA.