Repaint only part of the client area

[MasterDucky]

Is there a way to get only a part of the client area with GDI?

Or do i need DirectX for this?

I mean if i wanted to repaint only a little rectangle in the client area and
leave the rest as it is.

[olivthill]

It is possible, e.g.

- If you draw a rectangle, then your program can test the coordinates before issuing the Rectangle() API with coordinates inside your area.
- It is the same for string of characters written with DrawText() or with TextOut().
- If you have a picture, you can use BitBlt() only for the area you want to repaint.
- Or you can use "regions". See http://msdn.microsoft.com/en-us/library/ms536684(VS.85).aspx

[MasterDucky]

Thank you Olivthill! (member.php?u=171621)

I'll give it a try.

[gstercken]

Is there a way to get only a part of the client area with GDI?

I mean if i wanted to repaint only a little rectangle in the client area and
leave the rest as it is.Sure - that's exactly what InvalidateRect() and InvalidateRgn() are for.