how to center a window

how to center a window

gogomon

Member #7,481

July 2006

I'm using openlayer under windows and cant figured out how to center the window in the middle of the screen when in windowed mode, can somebody point me in the right direction pls.

ReyBrujo

Moderator

January 2001

That is not possible with the current Allegro library. You will have to write your own Window Class to handle the position, or recompile the Allegro library.

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gogomon

Member #7,481

July 2006

is there anyway i can use the function to get a handle and call a function that will center the window and pass the HWND as reference?. I never programmed with windows so I dont really know.

Richard Phipps

Member #1,632

November 2001

Some code by Spellcaster:

1// the window initially starts at 32,32.
2// This will center the window on the desktop
3void center_window()
4{
5#ifdef ALLEGRO_WINDOWS
6    HWND wnd = win_get_window();
7    HWND desktop = GetDesktopWindow();
8    RECT wndRect, desktopRect;
9    int  w , h , dw, dh;
10 
11    GetWindowRect( wnd , &wndRect );
12    GetWindowRect( desktop , &desktopRect );
13    w  = wndRect.right      - wndRect.left;
14    h  = wndRect.bottom     - wndRect.top;
15    dw = desktopRect.right  - desktopRect.left;
16    dh = desktopRect.bottom - desktopRect.top;
17 
18    MoveWindow( wnd , ( dw - w ) / 2 , ( dh - h ) / 2 , w , h , TRUE );
19#endif
20}

You'll need to add #include <winalleg.h> after your #include <alleg.h> line

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Matthew Leverton

Supreme Loser

January 1999

Doesn't the Allegro window start up centered or does OpenLayer somehow change that?

changelog said:

Changes from 4.1.17 to 4.1.18 (January 2005)
Tore Halse made the Allegro window always appear centred in Windows.

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gogomon

Member #7,481

July 2006

not sure, but thanks for the code richard exactly what i was looking for. Thx again

Felipe Maia

Member #6,190

September 2005

OpenLayer changes that somehow.

Thomas Fjellstrom

Member #476

June 2000

I'll bet its AllegroGL changing it, AGL replaces ALOT of allegro's code. It is a separate driver after all.

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