[PD] [gem] how to fit a rectangle into gem-window in fullscreen-mode

Jerome Tuncer columbiatwo at free.fr
Fri Aug 19 21:12:28 CEST 2005

Hallo Iohannes,

You said something that I find interesting as I'm trying to learn Gem,

The height of the GemWin will always be 4 units? How's that?

Where was I supposed to find about that? I have read a few 
documentations and none of them specified this... Do you recommend one 
in particular?


IOhannes m zmoelnig a écrit :
> Roman Haefeli wrote:
>>i'd like to show some images in fullscreen-mode with
>>gem. since it is cheaper to use [pix_texture] than to
>>draw the image directly, i draw a rectangle that fits
>>exactly in the gem-window and apply the image as a
>>i plan to create an application that will be used on
>>different machines with different displays. at the
>>moment i have to change the dimensions of the
>>[rectangle] manually when i use the patch on a machine
>>with different display-resolution. 
> no you don't!
>>i think there is a relation between the used
>>resolution and x- and y-values of [rectangle], but i
>>failed finding it. is there a way to calculate these
>>values from the resolution in order to fit the
>>[reactangle] exactly into the gem-window? this would
>>allow to write the actual resolution in a config-file
>>whitout the need of changing the patch.
> the only problematic thing that can happen to you is when your
> aspect-ratio changes.
> a rectangle that covers the full-screen on 500x500 will not cover the
> entire screen on 800x600;
> however: the same rectangle that covers 1024x768 will also cover a
> 1600x1200 screen (or a 320x240 window)
> note: the height of the gemwindow will always be 4 units (the width will
> change with the aspect-ratio)
> note: you will probably want to keep the aspect-ratio in order to not
> distort your images)
> mf.a.r
> IOhannes
> PS: if you find that i am talking non-sense, then you are likely to have
> discovered a bug
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