Re: [android-developers] using pixel coordinates in opengl es 2

Hi,

I might be wrong but I think you can create an orthographic projection matrix for this purpose using Matrix.orthoM. Just provide it with top=0, bottom=height, left=0, right=width.

--
H

On Aug 29, 2012, at 8:50 PM, guich <guihazan@gmail.com> wrote:

> Hi,
>
> I downloaded and played with the opengl sample at
> http://developer.android.com/training/graphics/opengl/draw.html
>
> However, it uses the standard coordinate system for opengl, where 0,0
> is at the center of the screen and -1,-1 at top-left and 1,1 at bottom-
> right.
>
> I want to use the screen's coordinate, where 0,0 is at top-left and
> width,height is at bottom-right.
>
> I already tried a dozen things, read about 30 articles, but since i'm
> a newbie at opengl, i'm still stumped.
>
> Can someone tell what it has to be done to change the coordinate so
> that the given rectangle
>
> static float squareCoords[] = { 10f, 10f, 0.0f, // top left
> 10f, 20f, 0.0f, // bottom left
> 20f, 20f, 0.0f, // bottom right
> 20f, 10f, 0.0f }; // top right
>
> ... is shown at screen?
>
> thanks
>
> guich
>
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