[Qgis-developer] Progress bar or continuous feature display when displaying large datasets (feature request)

[Stefan Keller]

Thanks Andreas - mea culpa - did'nt realize this. To me following
suggestion remains:

1. Why is'nt this Rendering Behavior ("Number of Features to draw
before updating the display") the default?

In addition, I recognized the following:

2. The Rendering behavior is void when option flag "Use display cache
if possible to speed up display" is on. I think, the options dialog
should reflect this relationship and disable "Rendering behavior".

3. When in main window and switching "Layer visibility" off, another
redraw is issued - only for making objects disappear right after
completing the drawing - and this (useless) redrawing might take a
long time.

Just my 5 cents. -Stefan

2010/2/10 Andreas Neumann <a.neumann at carto.net>:
> Hi Stefan,
>
> Continuous feature drawing is already possible, but is disabled by
> default, as in the overall, it slows down rendering.
>
> If you want to enable it:
>
> Settings --> Options --> Rendering & SVG --> Rendering behavior -->
> "Number of Features to draw before updating the display" --> set it to > 0
> (e.g. 10000).
>
> Andreas
>
> On Wed, February 10, 2010 8:35 pm, Stefan Keller wrote:
>> I'm currently working on a geodatabase benchmark proposal (look for
>> "HSR Texas Database Benchmark") and consequently dealing with large
>> datasets.
>> When displaying these large datasets in QGIS I often get trapped in
>> thinking, the process would never end because there's "just" a wait
>> cursor.
>> As a feature request I would suggest that there could be a continuous
>> feature display (as in uDig :->) or at least a progress bar (if
>> datasource makes this info available).
>> Just my 5 cents. -Stefan
>> _______________________________________________
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>>
>
>
> --
> Andreas Neumann
> http://www.carto.net/neumann/
> http://www.svgopen.org/
>
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