Interactive Graph, 2D C# OpenGL

Question

Hi,

I need some advice on the best way to go about this so I dont end up making it overly complicated.

I have a 2d graph draw in openGL the scale is set on drawing depending how much data there is.

What I need to do is make it interactive because at the moment with large ammount of data the finer point are lost because the scale is so big.

what would the best was to impliement a zoom feature so you can see part of the graph in more detail and move around the graph close up.

Im not the most advanced with openGL but any help would be great.