Solved

OpenGL and MFC - Lclick coordinate

Posted on 1997-09-21
4
320 Views
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]
0
Comment
Question by:vinny5
  • 3
4 Comments
 

Author Comment

by:vinny5
ID: 1406969
Edited text of question
0
 

Author Comment

by:vinny5
ID: 1406970
Edited text of question
0
 
LVL 15

Accepted Solution

by:
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.


0
 

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.

0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article shows how to make a Windows 7 gadget that accepts files dropped from the Windows Explorer.  It also illustrates how to give your gadget a non-rectangular shape and how to add some nifty visual effects to text displayed in a your gadget.…
This article describes how to add a user-defined command button to the Windows 7 Explorer toolbar.  In the previous article (http://www.experts-exchange.com/A_2172.html), we saw how to put the Delete button back there where it belongs.  "Delete" is …
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

839 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question