Hello,<br>
I am able to display features using unique value renderer now :).<br>
Could you please tell me how to give different "symbols" to different attributes in a particular field.<br>
<br>
Here is the code with which i am trying to display features:<br>
<br>
<span style="font-weight: bold;">mypRenderer->setClassificationField (2);</span><br style="font-weight: bold;">
<span style="font-weight: bold;"><span style="font-weight: bold;">//</span>std::list<int> attributes=mypRenderer->classificationAttributes();</span><br style="font-weight: bold;">
<span style="font-weight: bold;">mypRenderer->insertValue ("1st attribute",symbol);</span><br style="font-weight: bold;">
<span style="font-weight: bold;">mypRenderer->insertValue ("2dn attribute",symbol1);</span><br>
Here i am hardcoding to give different colors for diferent attributes.<br>
Is there any way do to it in a generic way.<br>
Thanking you<br>
cheers<br>
satya<br>
<br><div><span class="gmail_quote">On 3/7/07, <b class="gmail_sendername">satya satya</b> <<a href="mailto:satya341@gmail.com">satya341@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Thank you very much Marco.<br>
Now i am able to display features.<div><span class="e" id="q_1112d8927c38d74a_1"><br>
regards,<br>
satya<br><br><div><span class="gmail_quote">On 3/7/07, <b class="gmail_sendername">Marco Hugentobler</b> <<a href="mailto:marco.hugentobler@karto.baug.ethz.ch" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
marco.hugentobler@karto.baug.ethz.ch</a>> wrote:</span>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi Satya,<br><br>Is "Dmg_zip" an attribute name or an attribute value?<br>You need to specify the attribute _value_ for which you want the symbol to
<br>apply. Additionally, you need to give the classification field index to the<br>renderer, so that it knows in which attribute to look.<br><br>You can see how the QGIS application itself does it. Look at the unique value
<br>dialog class QgsUniqueValueDialog.cpp/h.<br><br>All the best,<br>Marco<br><br>Am Mittwoch, 7. März 2007 17:17 schrieb satya satya:<br>> Hi Marco,<br>> I uncommented //mypRenderer->insertValue("point",symbol); , I changed
<br>> "POINT" to "Dmg_zip" which is one of the attributes of my shape file.<br>> Unfortunately it displayed nothing. Do i need to iterate all the points in<br>> the shaped file??<br>> Thaking you
<br>> regards<br>> satya<br>><br>> On 3/7/07, Marco Hugentobler <<a href="mailto:marco.hugentobler@karto.baug.ethz.ch" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">marco.hugentobler@karto.baug.ethz.ch
</a>> wrote:<br>> > Hi Satya,<br>> >
<br>> > Just use the Method QgsUniqueValueRenderer::insertValue(QString name,<br>> > QgsSymbol* symbol). The first parameter is the attribute value for which<br>> > the<br>> > symbol is valid, the second a pointer to your symbol (ok, 'name' is a
<br>> > misleading name for the parameter...)<br>> ><br>> > In the code below, there is the outcommented line<br>> > //mypRenderer->insertValue("point",symbol);<br>> > I suppose "point" is not the attribute value for which you want the
<br>> > symbol to<br>> > be applied? Try to replace it with the attribute value and see if it<br>> > works.<br>> ><br>> > If you want the symbol to be valid for all features, then you can use
<br>> > QgsSingleSymbolRenderer, method<br>> > QgsSingleSymbolRenderer::addSymbol(QgsSymbol*)<br>> ><br>> > Best regards,<br>> > Marco<br>> ><br>> > Am Mittwoch, 7. März 2007 15:38 schrieb satya satya:
<br>> > > Hi tim,<br>> > > Here is the code<br>> > ><br>> > > // QGIS Includes<br>> > > // Qt Includes<br>> > > // Std Includes<br>> > ><br>> > > int main(int argc, char ** argv)
<br>> > > {<br>> > > // Start the Application<br>> > > QgsApplication app(argc, argv, true);<br>> > ><br>> > > QString myPluginsDir = "...../lib/qgis";<br>
> > > QString myLayerPath1 = ".............................<br>> > > .......shp"; QString myLayerBaseName1 = "....................shp";<br>> > > QString myProviderName = "ogr";
<br>> > > QgsSymbol* symbol;<br>> > > QColor* color;<br>> > ><br>> > ><br>> > > color = new QColor(255,0,0,255);<br>> > ><br>> > > symbol = new QgsSymbol(color->rgb());
<br>> > ><br>> > > // Instantiate Provider Registry<br>> > > QgsProviderRegistry::instance(myPluginsDir);<br>> > > QgsVectorLayer * mypLayer = new QgsVectorLayer(myLayerPath1,<br>
> > > myLayerBaseName1, myProviderName);<br>> > ><br>> > > //get the field list associated with the layer<br>> > > std::vector<QgsField> myFields=mypLayer->fields();<br>> > > QgsUniqueValueRenderer *mypRenderer=new
<br>> > > QgsUniqueValueRenderer(mypLayer->vectorType());<br>> > ><br>> > > mypRenderer->setClassificationField(5);<br>> > ><br>> > > symbol->setColor(Qt::red);<br>
> > > symbol->setFillColor(QColor(255,0,0));
<br>> > > symbol->setLabel("HELLO");<br>> > > symbol->setPointSize (5);<br>> > ><br>> > ><br>> > > std::deque<QString> myLayerSet;<br>> > > mypLayer->setRenderer(mypRenderer);
<br>> > > //mypRenderer->insertValue("point",symbol);<br>> > > if (mypLayer->isValid())<br>> > > {<br>> > > qDebug("Layer is valid");<br>> > > }
<br>> > > else<br>> > > {<br>> > > qDebug("Layer is NOT valid");<br>> > > }<br>> > ><br>> > > // Add the Vector Layer to the Layer Registry<br>> > >
<br>> > > QgsMapLayerRegistry::instance()->addMapLayer(mypLayer, TRUE);<br>> > > // Add the Layer to the Layer Set<br>> > ><br>> > ><br>> > ><br>> > > myLayerSet.push_back
(mypLayer->getLayerID());<br>> > > mypLayer->setVisible(TRUE);<br>> > ><br>> > ><br>> > ><br>> > > // Create the Map Canvas<br>> > > QgsMapCanvas * mypMapCanvas = new QgsMapCanvas(0, 0);
<br>> > > mypMapCanvas->setExtent(mypLayer->extent());<br>> > > // cbit qDebug(mypMapCanvas->extent().stringRep(2));<br>> > ><br>> > > mypMapCanvas->enableAntiAliasing(true);
<br>> > > mypMapCanvas->setCanvasColor(QColor(255, 255, 255));<br>> > > mypMapCanvas->freeze(false);<br>> > > // Set the Map Canvas Layer Set<br>> > > mypMapCanvas->setLayerSet(myLayerSet);
<br>> > > mypMapCanvas->setVisible(true);<br>> > > mypMapCanvas->refresh();<br>> > > // Start the Application Event Loop<br>> > > //cout<<marker_symbol->picture().toStdString()<<endl;
<br>> > > app.exec();<br>> > > //QgsMapCanvas myMapCanvas(0, 0);<br>> > > QgsMapLayerRegistry::instance()->removeAllMapLayers();<br>> > > return 0;<br>> > > }<br>> > >
<br>> > > I created symbol, but don't know how to add that to the unique value<br>> > > renderer.<br>> > ><br>> > > Thanking you<br>> > > cheers<br>> > > satya<br>
> > ><br>> > > > On 3/5/07, Tim Sutton <<a href="mailto:tim@linfiniti.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">tim@linfiniti.com</a>> wrote:<br>> > > > > Hi
<br>> > > > ><br>> > > > > How about posting code examples of what you have tried and we can
<br>> ><br>> > try<br>> ><br>> > > > > to help you from there....<br>> > > > ><br>> > > > > Regards<br>> > > > ><br>> > > > > Tim
<br>> > > > ><br>> > > > > 2007/3/5, satya satya <<a href="mailto:satya341@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">satya341@gmail.com</a> >:<br>
> > > > > > Hello all,<br>>
> > > >
>
I am trying to develop a simple application using<br>> ><br>> > QGis<br>> ><br>> > > > > API.<br>> > > > ><br>> > > > > > I have read all tutorials on QGis blog. I would like to use
<br>> > > > > > "QgsUniqueValueRenderer" in my application to display features in<br>> > > > > > diff<br>> > > > > ><br>> > > > > > colors. I tried that "QgsUniqueValueRenderer" , but no luck.
<br>> > > > > > could some body help me .<br>> > > > > > cheers<br>> > > > > > satya<br>> > > > > ><br>> > > > > > _______________________________________________
<br>> > > > > > Qgis-developer mailing list<br>> > > > > > <a href="mailto:Qgis-developer@lists.qgis.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">Qgis-developer@lists.qgis.org
</a><br>> > > > > > <a href="http://lists.qgis.org/cgi-bin/mailman/listinfo/qgis-developer" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://lists.qgis.org/cgi-bin/mailman/listinfo/qgis-developer</a><br>> > > > ><br>> > > > > --<br>> > > > > --<br>> > > > > Tim Sutton<br>> > > > >
<br>> > > > > Visit <a href="http://qgis.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://qgis.org</a> for a great Open Source GIS<br>> > > > > Home Page: <a href="http://linfiniti.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://linfiniti.com</a><br>> > > > > Skype: timlinux
<br>> > > > > MSN: <a href="mailto:tim_bdworld@msn.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">tim_bdworld@msn.com</a><br>> > > > > Yahoo: <a href="mailto:tim_bdworld@yahoo.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
tim_bdworld@yahoo.com</a><br>> > > > > Jabber: timlinux
<br>> > > > > Irc: timlinux on #qgis at <a href="http://freenode.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">freenode.net</a><br></blockquote></div><br>
</span></div></blockquote></div><br>