[Qgis-developer] how to render selected feature on top of the others?

[G. Allegri]

thanks Martin,
I will consider both the solutions. Wouldn't it be usefull to have
this implemented, at least as an option?

giovanni

2010/8/3 Martin Dobias <wonder.sk at gmail.com>:
> Hi Giovanni
>
> On Fri, Jul 30, 2010 at 6:34 PM, G. Allegri <giohappy at gmail.com> wrote:
>> In my application I need to let the user to select (from a table) and
>> zoom to a specified feature
>> The layer is made of a dense cloud of points, so even if the point get
>> selected it happens to be hidden by other (unselected) points.
>> Is it possible to ask the renderer to put the selected points on top
>> of the others?
>
> I'm not aware of any straightforward way.
>
> You could create a temporary layer (using memory provider) and put the
> selected features into it. If the temporary layer will be placed on
> top of the original layer, the user will always see the selected
> features.
>
> If using new symbology, you could implement a custom renderer which
> would delay rendering of the selected features and render them at last
> in stopRender() method.
>
> Regards
> Martin
>