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Newcomers DBPro Corner / Centering a sprite

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Magnolia

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Joined: 19th Jan 2009

Location: New Jersey

Posted: 4th Feb 2009 18:40

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Hi,

I'm trying to position a button (sprite) in the centre of the screen along the x axis. Is there a command that does this?

Thanks!

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Rudolpho

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Joined: 28th Dec 2005

Location: Sweden

Posted: 4th Feb 2009 20:32

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That's quite easy to do.
You can get the sprite dimensions by using sprite width and sprite height. Then you scoop up on the screen dimensions in a similar way using screen width and screen height.

To center the sprite, you then simply offset it to half the screen width / height, subtracted by half the sprite width / height.
Like so:

+ Code Snippet

rem Centre sprite
sprite id, (screen width() - sprite width(id)) / 2.0, (screen height() - sprite height(id)) / 2.0, imgID

"We know some things about poodles, for example that they are alive, they can bark, they eat meat..."
- Extract from Objects first with Java.

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Sixty Squares

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Joined: 7th Jun 2006

Location: Somewhere in the world

Posted: 4th Feb 2009 23:41 Edited at: 4th Feb 2009 23:41

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I think something like this would work, using the OFFSET SPRITE command, which offset's the appearence of a sprite but not its actual location:

+ Code Snippet

rem Let sn = Sprite Number
rem Position the sprite at the center of the screen
Sprite sn, Screen Width()/2, Screen Height()/2,imagenumber
rem Set the top left corner of the sprite to be offset from where the sprite actually is by half of the sprite's size, to the LEFT and UP...
Offset Sprite sn,Sprite Width(sn)/-2,Sprite Height(sn)/-2

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Newcomers DBPro Corner / Centering a sprite