I've got a function that returns a value, a percentage to be exact. This percentage is almost always going to be between 80-85, so to graph that with an X axis of 0 - 100 will look boring, it'll be mostly a straight line. I want to magnify it so the X axis will only display a range of say 75-90 so as to magnify the results and make it look more interesting. I'll be calling the function every second and the graph will be dynamic, I'm making a desklet. Basically, I want to take a range of 0-100, make it so an internal range of 75-90 is equal to 0-100, then graph that.

I know what I want to do and if I was drawing the graph on paper it'd be a non-issue but I'm drawing a blank as to how I can work this out. I can't think of a better way to explain it so I hope somebody understood. Any suggestions on the math behind this would be appreciated, I can do the code to draw the graph no worries.

Thanks