[Qgis-developer] Improve symbology system

[Denis Rykov]

Thanks, but when I try to open Image I get - HTTP 403 (Forbidden)
On Fri, Sep 28, 2012 at 12:16 PM, Nathan Woodrow <madmanwoo at gmail.com>wrote:

> I can get QGIS to do what you need:
>
> http://img6.imagebanana.com/img/uewfzlmc/Workspace1_155.png
>
> Selected the Symbol:Fill tree item and then selected Advanced->Symbol
> Levels
>
> Just enable symbols levels and it will render how you need.
>
> - Nathan
>
> On Fri, Sep 28, 2012 at 2:35 PM, Denis Rykov <rykovd at gmail.com> wrote:
> > QGIS is used rendering order of symbol layers within features not within
> > layer. Try to set up layer (two overlapped polygons) symbology for
> getting
> > such result http://hub.qgis.org/attachments/4909/geoserver_sld.png. Of
> > course you can open the same layer twice and set up their symbology
> > separately, but it is not the right solution.
> >
> >
> > On Fri, Sep 28, 2012 at 11:18 AM, Nathan Woodrow <madmanwoo at gmail.com>
> > wrote:
> >>
> >> QGIS does already have the ability to control the rendering order of
> >> symbol layers, and should be able to do what you need.
> >>
> >> - Nathan
> >>
> >> Sent from some fancy phone looking thingo
> >> ________________________________
> >> From: Denis Rykov
> >> Sent: 28/09/2012 1:29 PM
> >> To: qgis-developer at lists.osgeo.org
> >> Subject: [Qgis-developer] Improve symbology system
> >>
> >> Some days ago I've faced with the following problem. For example, I have
> >> two overlapped polygons and want to draw this layer such way:
> >> http://hub.qgis.org/attachments/4909/geoserver_sld.png Now it looks
> like I
> >> cannot do it with QGIS symbology system. Screenshot which I provided
> above
> >> was made in GeoServer with the following SLD configuration:
> >>
> >>> <StyledLayerDescriptor version="1.0.0"
> >>> xmlns:xlink="http://www.w3.org/1999/xlink"
> >>> xmlns:ogc="http://www.opengis.net/ogc" xmlns="
> http://www.opengis.net/sld">
> >>> <NamedLayer>
> >>> <Name>test</Name>
> >>> <UserStyle>
> >>> <Name>test</Name>
> >>> <FeatureTypeStyle>
> >>> <Rule>
> >>> <LineSymbolizer>
> >>> <Stroke>
> >>> <CssParameter name="stroke-width">4</CssParameter>
> >>> <CssParameter name="stroke">#dddddd</CssParameter>
> >>> </Stroke>
> >>> </LineSymbolizer>
> >>> </Rule>
> >>> </FeatureTypeStyle>
> >>> <FeatureTypeStyle>
> >>> <Rule>
> >>> <PolygonSymbolizer>
> >>> <Fill>
> >>> <CssParameter name="fill">#fa5000</CssParameter>
> >>> </Fill>
> >>> </PolygonSymbolizer>
> >>> </Rule>
> >>> </FeatureTypeStyle>
> >>> </UserStyle>
> >>> </NamedLayer>
> >>> </StyledLayerDescriptor>
> >>
> >>
> >> I tried to import this SLD into QGIS, but SLD docs containing multiple
> >> FeatureTypeStyle are not supported yet (#6413). But I think that
> problem is
> >> more seriously. Now in QGIS rendering performs by features but not by
> >> layers. Try to explain it. For example we have two symbol's layer -
> first
> >> with border, but without filling and second - with filling but without
> >> border. If we try to render such layer we will get the following result:
> >> http://gis-lab.info/forum/download/file.php?id=5008. It is expected
> >> beacause QGIS is used by feature rendering approach. Another approach is
> >> using rendering by layer: first draw a layer according to the symbology
> of
> >> the first level, and then second and then overlying each other. In this
> case
> >> we get result as in GeoServer. I think that this approach is more
> flexible,
> >> using "by layer" rendering we can get the the same result as using "by
> >> feature" approach (in our case using one level symbology with border and
> >> filling). Is it to makes sense to add checkbox to each symbology layer
> wich
> >> will be indicate QGIS rendering system used "by layer" rendering
> approach?
> >>
> >> ArcGIS is used "by feature" approach but solves described issue by using
> >> join operator, for example:
> >> http://gis-lab.info/share/DR/screenshots/symbollevels.png
> >
> >
>
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