Some minor issues with this program

Hi all

I am currently working on this program (as attached) and would appreciate if anyone could advice me on some of the issues.

This program actually allows you to control the movement of the ball (bitmap) by using timers. It consists of a control panel that enables you to control the ball movement direction and speed.

Some issues faced are:
1) When I click on start/stop, minimize the main window and restore it, the bitmap is gone.

2) When the control panel moves over the bitmap, it disappears.

3) Hot-keys doesn't work with the control panel (IE: on keypress "w", the ball should move upwards direction etc).

4) How can I center the bitmap on launching the application? (I have tried to put it on the onCreate() handler but when the main window is maximize, it doesn't seem proportion).

Thanks in advance :)

1. + 2. You need to redraw the bitmap on the WM_PAINT message.

3. I didn't look at the source code but are you sure you are looking at the message correctly in wparam?

4. make a simple algorithm from the client rect and do the (top - bottom) / 2 and (left - right) / 2 then place the bitmap there.

You mean I need to do a InvalidateRect(NULL); under WM_PAINT message?

For point 3, yes, I think I placed the message correctly... just that I removed it because it wasn't working... you have to place it again to test.

>>> onCreate() handler

Smells like MFC, if you are using MFC you should say so. Most people in here use the API and a lot of the API functions are wrapped up in MFC classes and don't work in the same way, or even take the same parameters.

Oh. So sorry about being unclear. Didn't know about it :) Yes, I'm using MFC (Visual Studio 6).

Any solutions/suggestions?

Ah, managed to solve the problems on my own.

For those who are interested, here's now it can be done.

In the OnTimer() event, replace DrawBall() with InvalidateRect(NULL,TRUE);

In the OnPaint() event, call the DrawBall() function. In this way, the ball will always be repainted.

That's all. Thanks for those whom have helped :) Appreciate it very much.