There are two factors which produce flickering:

• Whenever we draw anything, we first clean the background (invalidate) and then redraw everything. This produces the flicker.
• We draw everything directly on the screen. So all the processing in the draw functions slows the process and things appear on the screen after some delay.

To remove this, we first make a bitmap, draw everything on this bitmap, and then paste this bitmap on the screen (without clearing the back ground). I have changed the code in Pang game. I have added two pointers in the CChildView class. They are:

CDC* m_pdcDisplayMemory;

CBitmap* m_pBitmap;

All the additional code is related to these pointers.

There are two major changes in the code that you should note:

• All the Draw functions now receive an argument of type “CDC” instead of “CPaintDC"

• A parameter (false) is passed to the function Invalidate( ) whenever this function is called.

Please remember that I have tried to keep the code simple, so the flickering is not removed perfectly. However, it should help most of you.

Pang Game with minimal Flickering