How to fit to client area (MFC)

Hi,
Im completely new to Visual C++ & have a question! I feel its a strange question, but I couldnt find the answer :(

Ive plotted a signal in the client area. When the child window is in the normal state (not maximized), the signal is fit to it.

How can I scale the plotted signal so that it is fit to client area when the window get resized or maximized? (probably using onSize()... I actually need to know how to get "client area size" when the window get resized)

(Please excuse my poor English)

It may be best to stop the user from re-sizing your application....

>>How can I scale the plotted signal so that it is fit to client area when the window get resized or maximized?

Depends...

In OnPaint() use copy the image using StretchBlt(). This will probably not produce good results with a line drawing like a plot.

>>how to get "client area size" when the window get resized

In the OnSized() [check this is when the window has finsihed changing size not is about to be resized, been a while since I wrote MFC]
Use GetClientRect() to find the size

You might find AdjustWindowRect() helpful.