[Qgis-developer] Improve symbology system

[Denis Rykov]

Thanks, Nathan! I never used advanced options of symbology before.

On Fri, Sep 28, 2012 at 12:24 PM, Nathan Woodrow <madmanwoo at gmail.com>wrote:

> Try this one https://dl.dropbox.com/u/6170988/layers.png
>
> - Nathan
>
> On Fri, Sep 28, 2012 at 3:20 PM, Denis Rykov <rykovd at gmail.com> wrote:
> >
> > 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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