Re: [Pythoncad-developer] Cairo or OpenGL?

[Yagnesh D. <yn...@gm...>]

Hi Gertwin;

Thanks for your effort on identifying and issue with the performance
in PythonCAD.

My vote is for cairo + homebrew for near future, As the interface
modules will be kept separate people should be able to add
other renderer in case they need

I have these reasons:

1. We are PYTHONCAD and so bringing in non python
related modules is not very good idea. Also staying cross platform
is MUST. Currently our packaging is having issues with
installation on LINUX as well as Windows.

2. Having said that we will stay 2D and more complete then
attempting a 3D. We can leave the 3D to other successful
projects (like FreeCAD which is NOT completely in python).
WE MUST DECIDE ON THIS BEFORE ADDING MUCH OF
FURTHER EFFORTS, ALSO SHOULD GIVE PROVISION
AT VARIOUS LEVELS IF WE GO FOR 3D.

Infact we should also clearly say how different we are from
QCAD, and focus our efforts to exploit the difference.

3. Real time PAN and ZOOM is is more like a wish then
necessity (Well with Python people should not expect ALL
the bells and whistles).

4. With OpenGL there is a learning curve for the team.

As you had pointed out rightly, first issue with performance
is in the GENERIC. Hence solving the issue of DOM should
be our first priority.

- - - - - -
Best regards

Yagnesh Desai
Save a tree...please don't print this e-mail.



On Wed, Feb 3, 2010 at 1:42 AM,  <ger...@gm...> wrote:
> Hi All,
>
> Starting a new thread about the renderer to choose.
> For the user interface we have chosen pygtk but the renderer is still
> unclear to me.
>
> A remainder from our emails:
>
> OpenGL:
> Pros:
> * very fast
> * in case we want to go on 3d no change of the way we show the entity
>
> Cons:
> * we need to learn how it works (personally i never use it)
> * installation problem we need more pakage to make it works
> * as gertwin say on mac we get some trouble.
>
>
> Cairo + homebrew display list:
> Pros:
> * no need to change the way that we draw the entity
> * it's no so slow if we build some smart algorithm
>
> Cons:
> * No real time zooming and panning possible, only on small parts of the
> drawing.
>
>
> Personally I would like to use OpenGL, realtime zooming and panning is a
> must have feature I think.
> Op OSX the cairo 3 second redraw time for 100000 elements is too much for
> such a feature.
> On linux we can use the gtkglext but on OSX I have to take a different
> approach.
>
> What are the opinions?
> If OpenGL is a no go I will let it rest, otherwise I am going to test
> gtk+opengl on OSX.
>
> Regards,
> Gertwin
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