[Qgis-developer] Suppress rendering of small features

[kimaidou]

Hi all

I also think dynamic scale-dependent simplification would be very nice but
for me ONLY if we can preserve topology when simplifying. If not, it would
lead to very uggly results
cf http://strk.keybit.net/blog/  for example

+1 for optionnaly remove small feature though, this will be good too !


2013/9/12 Vincent Mora <vincent.mora at oslandia.com>

> Hi,
>
> I did something somewhat similar to solve #4819 in Jully ("Identify
> Features"
> tool is slow with complex/big features) and Matthias asked me to do the
> same thing for the rubber-band.
>
> In polygon contours, points that are less than a pixel apart from the
> previous point are not drawn.
>
> That improved (dramatically) the rendering speed.
>
> Vincent
>
>
> On 12/09/2013 13:03, Sandro Santilli wrote:
> > On Thu, Sep 12, 2013 at 08:51:43AM +0200, Andreas Neumann wrote:
> >> Hi,
> >>
> >> As I understand, the feature to suppress small/large features would be
> >> optional.
> >>
> >> Another interesting thing would be to simplify features when you zoom
> >> out. Maybe simplifying would be quicker than rendering thousands of
> >> unnecessary vertices. Optionally this could also be "outsourced" to the
> >> database - many databases support simplification on the db level. I
> >> don't know if it would really speed up things. One would have to test.
> > I've done this for mapnik and it worked pretty nicely:
> > http://blog.cartodb.com/post/20163722809/speeding-up-tiles-rendering
> >
> > --strk;
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