Window Centering Problem - GameCreators Forum

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mikeMarek 597

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Joined: 12th Feb 2009

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Posted: 8th Jul 2009 03:27

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I can't get my window to center using dbSetWindowPosition(), it always offsets the window from the center of the screen. I'm using a simple code as such:

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const int screen_width  = dbScreenWidth();
const int screen_height = dbScreenHeight();

int window_width  = 800;
int window_height = 600;

dbSetWindowSize(window_width, window_height);

//assuming the window x and y coordinates are at the top-left of the window
dbSetWindowPosition((screen_width / 2) - (window_width / 2), (screen_height / 2) - (window_height / 2));

I can find the exact values to use for centering, but I want options in my game to adjust screen size and resolution, and I don't want to store the exact values for each resolution, plus the user's screen size might be different - causing more problems.

So, why won't the window center perfectly? Is there something I'm not doing correctly? Also, where is the window registation point (for positioning)? Is it the top-left corner? Center of the window?

Thanks for any help on the subject,
-Mike

Wait... What were we talking about?

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AndrewT

17

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Joined: 11th Feb 2007

Location: MI, USA

Posted: 8th Jul 2009 03:37 Edited at: 8th Jul 2009 03:38

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The problem is that dbScreenWidth/height() will return the size of the DBP window--the value you used with dbSetDisplayMode(). Use dbDesktopWidth() and dbDesktopHeight() instead of dbScreenWidth() and dbScreenHeight().

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Cryptic Dragon

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Posted: 8th Jul 2009 08:15 Edited at: 8th Jul 2009 08:17

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Quote: "The problem is that dbScreenWidth/height() will return the size of the DBP window--the value you used with dbSetDisplayMode(). Use dbDesktopWidth() and dbDesktopHeight() instead of dbScreenWidth() and dbScreenHeight()."

I was also wondering if DarkGDK had some functions for this thanks AndrewT. I had to design my own since I could not find those functions in the list. Here is what i did...

+ Code Snippet

// actual monitor pixel width
int cx = GetSystemMetrics(SM_CXSCREEN);
// actual monitor pixel height
int cy = GetSystemMetrics(SM_CYSCREEN);

int CurrentScreenWidth = dbScreenWidth();
int CurrentScreenHeight = dbScreenHeight();

// CENTERING TECHNIQUE
dbSetWindowPosition ((cx - CurrentScreenWidth)/2, (cy - CurrentScreenHeight)/2);

CrypticDragon

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AndrewT

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Joined: 11th Feb 2007

Location: MI, USA

Posted: 8th Jul 2009 20:31

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Quote: "I had to design my own since I could not find those functions in the list."

Oh, sorry about that. They were added to DBP fairly recently, however as you found out GetSystemMetrics() with a value of 0 or 1 (SM_CXSCREEN and SM_CYSCREEN accordingly) does the same thing.

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Dark GDK / Window Centering Problem