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06.18.2003 at 12:23AM PDT, ID: 20651844
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7.8

issues updating GUI

Asked by kmule81 in Windows MFC Programming

Tags: , , ,

Hi,

I am writing a simple multithreaded program that modifies a polygon's vertices in a worker thread (in a very computationally expensive way, hence the thread), and then updates the screen after each iteration

It uses double buffered opengl to do the rendering, but i am running into a bit of a problem:

When i update the screen, it flickers a lot, as it does the updating, to the point of being unusable.

Here is what i have...

my thread calls     myProjView::update_pts(ctl_points), which calls Invalidate()
                         in my OnPaint() function (i didnt implement onDraw() ), i call    drawOpenGl(), which draws a bitmap and then the polygon on top of it.  OnPaint() then calls SwapBuffers to update the screen all at once.

Is there any way to get rid of the flicker (doeble buffering should be taking care of this)... or something i am doing wrong?


Thanks,
Kenny
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[+][-]06.18.2003 at 06:22AM PDT, ID: 8748907

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[+][-]06.19.2003 at 09:38AM PDT, ID: 8759517

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About this solution

Zone: Windows MFC Programming
Tags: being, called, gui, updating
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Solution Provided By: oliverlizotte
Participating Experts: 2
Solution Grade: A
 
 
[+][-]06.23.2003 at 09:22AM PDT, ID: 8782694

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