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OpenGL and MFC - Lclick coordinate

Posted on 1997-09-21
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Last Modified: 2013-12-03
I have a 2-D grid on a window. When the user left clicks on
the space of the grid, I need to get the coordinate that was clicked in the OpenGL projection, not the pixel coordinates
of the window passed in Cpoint of the OnLButtonDown(UINT nFlags, CPoint point).

I need help finding those corrindates so that the user can create an object where he just clicked.
[Using Visual C++ 5.0]
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Question by:vinny5
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Author Comment

by:vinny5
ID: 1406969
Edited text of question
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Author Comment

by:vinny5
ID: 1406970
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Tommy Hui earned 500 total points
ID: 1406971
When displaying the grid, don't you keep track of the origin of the grid and the projection matrix? If so, then you can apply the projection matrix to the point after adjusting for the origin of the grid. This will give you the translated point.


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Author Comment

by:vinny5
ID: 1406972
Thanks, but I still dont exactly know how to apply the projection matrix to the point.  But I see what your saying, I have the superbible and I havent seen an example like this. If you havent noticed im a begginer of OpenGL, and MFC.

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