OpenGL Koch Curve: Fixed and Rendering Well
lazarus / 39-Graphics

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Boleeman · 2024-09-21 00:38

Tried to convert an OpenGL  Koch Curve fractal code from Delphi

Got an external access violation error.


I was rendering to the form canvas and not to the OpenGL control.

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Boleeman · 2024-09-21 01:47

I replaced dglOpenGL with GL in uses and got rid of dglOpenGL.pas in
Project inspector and now I don't have the access violation error. It
compiles OK

I get a Yellow Koch Curve, but it is flashing.

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Lulu · 2024-09-21 08:18

Hi, at the end of the FormPaint method, if you replace Refresh by
Invalidate there is no flashing.
Tested on windows 10.
There is another problem: the app don't stop if I click on the red
cross at top-right of the windows.

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Boleeman · 2024-09-21 09:17

Thanks Lulu for the reply.

I worked out that I was not rendering to the OpenGL control, but to
the Form1 canvas.

Now it is all fixed and working well.

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Lulu · 2024-09-21 17:09

Quote from: Boleeman on September 21, 2024, 11:17:08 amI worked out
that I was not rendering to the OpenGL control, but to the Form1
canvas.

I didn't realise it either