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C++ opengl Orthogonal mode hex tile wrong

Started by Renran Aug 20, 2012 at 8:15 AM 3 replies 2.2k views

Original Post

Aug 20, 2012 at 8:15 AM

Hello,

I know I should know this things, but here it goes:
When I make a map of hex tiles and the width and height are equal
I receive beautiful dimensioned tiles.
But when I (for instance) take a width of 20 tiles and a height of 5 tiles
then I have 5 lines with tiles with their height halved and their width intact.
I know it has something to do with the dimensions of the screen (I use
1024 x 768) but what to do about it, I want the dimension of the tiles
to be correct.

Greetings and Thanks,

Renran

Goran Milovanovic

Aug 21, 2012 at 1:21 PM

A little more information would help. Could you post two screenshots: One where it's equal, and tiles look as they should, and the other where it's not equal, and you get the undesired effect.

FXACE

Aug 22, 2012 at 12:35 AM

You need to update your projection matrix on "screen size change" event: (for example)


 /* void onScreenSizeChange(int width, int height) { */
 // width, height - new screen size
 glViewport(0, 0, width, height);
 // using classic OpenGL
 glMatrixMode(GL_PROJECTION);
 glLoadIdentity();
 glOrtho(width*-0.5,width*0.5,height*-0.5,height*0.5,-1,1); /* modify values here as you need */
 glMatrixMode(GL_MODELVIEW);
 /* } */

So, when you apply this code, on any screen dimensions you will receive quadratic tiles.

Best wishes, FXACE.

Renran

Aug 23, 2012 at 1:07 PM

Ok, thanks Guys I will try to do this.
I did not know where I had to look with this event.

Greetings and thanks,

Renran

Renran

Aug 23, 2012 at 2:24 PM

Yes FXACE, that does the trick, long ago I did also struggle with this one
but I did forget how I had to modify.

But thanks for answering guys, Goran Milovanovic and FXACE,

Fred

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