Populate 3D symbol registry, and use to create symbols

python/3d/auto_generated/symbols/qgsline3dsymbol.sip.in

@@ -30,6 +30,13 @@ class QgsLine3DSymbol : QgsAbstract3DSymbol
     QgsLine3DSymbol();
 %Docstring
 Constructor for QgsLine3DSymbol
+%End
+
+    static QgsAbstract3DSymbol *create() /Factory/;
+%Docstring
+Creates a new QgsLine3DSymbol.
+
+Caller takes ownership of the returned symbol.
 %End
 
     virtual QString type() const;

python/3d/auto_generated/symbols/qgspoint3dsymbol.sip.in

@@ -35,6 +35,13 @@ Constructor for QgsPoint3DSymbol with default QgsMarkerSymbol as the billboardSy
     QgsPoint3DSymbol( const QgsPoint3DSymbol &other );
 %Docstring
 Copy Constructor for QgsPoint3DSymbol
+%End
+
+    static QgsAbstract3DSymbol *create() /Factory/;
+%Docstring
+Creates a new QgsPoint3DSymbol.
+
+Caller takes ownership of the returned symbol.
 %End
 
     virtual QString type() const;

python/3d/auto_generated/symbols/qgspolygon3dsymbol.sip.in

@@ -41,6 +41,13 @@ Constructor for QgsPolygon3DSymbol
     virtual void readXml( const QDomElement &elem, const QgsReadWriteContext &context );
 
 
+    static QgsAbstract3DSymbol *create() /Factory/;
+%Docstring
+Creates a new QgsPolygon3DSymbol.
+
+Caller takes ownership of the returned symbol.
+%End
+
     Qgs3DTypes::AltitudeClamping altitudeClamping() const;
 %Docstring
 Returns method that determines altitude (whether to clamp to feature to terrain)

src/3d/qgs3d.cpp

@@ -25,6 +25,10 @@
 #include "qgsrulebased3drenderer.h"
 #include "qgsvectorlayer3drenderer.h"
 #include "qgsmeshlayer3drenderer.h"
+#include "qgs3dsymbolregistry.h"
+#include "qgspoint3dsymbol.h"
+#include "qgsline3dsymbol.h"
+#include "qgspolygon3dsymbol.h"
 
 Qgs3D *Qgs3D::instance()
 {
@@ -46,6 +50,14 @@ void Qgs3D::initialize()
   QgsApplication::renderer3DRegistry()->addRenderer( new QgsVectorLayer3DRendererMetadata );
   QgsApplication::renderer3DRegistry()->addRenderer( new QgsRuleBased3DRendererMetadata );
   QgsApplication::renderer3DRegistry()->addRenderer( new QgsMeshLayer3DRendererMetadata );
+
+  QgsApplication::symbol3DRegistry()->addSymbolType( new Qgs3DSymbolMetadata( QStringLiteral( "point" ), QObject::tr( "Point" ),
+      &QgsPoint3DSymbol::create ) );
+  QgsApplication::symbol3DRegistry()->addSymbolType( new Qgs3DSymbolMetadata( QStringLiteral( "line" ), QObject::tr( "Line" ),
+      &QgsLine3DSymbol::create ) );
+  QgsApplication::symbol3DRegistry()->addSymbolType( new Qgs3DSymbolMetadata( QStringLiteral( "polygon" ), QObject::tr( "Polygon" ),
+      &QgsPolygon3DSymbol::create ) );
+
 }
 
 Qgs3D::Qgs3D()

src/3d/qgsrulebased3drenderer.cpp

@@ -28,6 +28,8 @@
 #include "qgspolygon3dsymbol_p.h"
 
 #include "qgsrulebasedchunkloader_p.h"
+#include "qgsapplication.h"
+#include "qgs3dsymbolregistry.h"
 
 QgsRuleBased3DRendererMetadata::QgsRuleBased3DRendererMetadata()
   : Qgs3DRendererAbstractMetadata( QStringLiteral( "rulebased" ) )
@@ -185,13 +187,7 @@ QgsRuleBased3DRenderer::Rule *QgsRuleBased3DRenderer::Rule::create( const QDomEl
   if ( !elemSymbol.isNull() )
   {
     QString symbolType = elemSymbol.attribute( QStringLiteral( "type" ) );
-    if ( symbolType == QLatin1String( "polygon" ) )
-      symbol = new QgsPolygon3DSymbol;
-    else if ( symbolType == QLatin1String( "point" ) )
-      symbol = new QgsPoint3DSymbol;
-    else if ( symbolType == QLatin1String( "line" ) )
-      symbol = new QgsLine3DSymbol;
-
+    symbol = QgsApplication::symbol3DRegistry()->createSymbol( symbolType );
     if ( symbol )
       symbol->readXml( elemSymbol, context );
   }

src/3d/qgsvectorlayer3drenderer.cpp

@@ -17,13 +17,12 @@
 
 #include "qgs3dutils.h"
 #include "qgschunkedentity_p.h"
-#include "qgsline3dsymbol.h"
-#include "qgspoint3dsymbol.h"
-#include "qgspolygon3dsymbol.h"
 #include "qgsvectorlayerchunkloader_p.h"
 
 #include "qgsvectorlayer.h"
 #include "qgsxmlutils.h"
+#include "qgsapplication.h"
+#include "qgs3dsymbolregistry.h"
 
 
 QgsVectorLayer3DRendererMetadata::QgsVectorLayer3DRendererMetadata()
@@ -98,15 +97,7 @@ void QgsVectorLayer3DRenderer::readXml( const QDomElement &elem, const QgsReadWr
 
   QDomElement elemSymbol = elem.firstChildElement( QStringLiteral( "symbol" ) );
   QString symbolType = elemSymbol.attribute( QStringLiteral( "type" ) );
-  QgsAbstract3DSymbol *symbol = nullptr;
-  if ( symbolType == QLatin1String( "polygon" ) )
-    symbol = new QgsPolygon3DSymbol;
-  else if ( symbolType == QLatin1String( "point" ) )
-    symbol = new QgsPoint3DSymbol;
-  else if ( symbolType == QLatin1String( "line" ) )
-    symbol = new QgsLine3DSymbol;
-
-  if ( symbol )
-    symbol->readXml( elemSymbol, context );
-  mSymbol.reset( symbol );
+  mSymbol.reset( QgsApplication::symbol3DRegistry()->createSymbol( symbolType ) );
+  if ( mSymbol )
+    mSymbol->readXml( elemSymbol, context );
 }

src/3d/symbols/qgsline3dsymbol.cpp

@@ -57,3 +57,8 @@ void QgsLine3DSymbol::readXml( const QDomElement &elem, const QgsReadWriteContex
   QDomElement elemMaterial = elem.firstChildElement( QStringLiteral( "material" ) );
   mMaterial.readXml( elemMaterial );
 }
+
+QgsAbstract3DSymbol *QgsLine3DSymbol::create()
+{
+  return new QgsLine3DSymbol();
+}

src/3d/symbols/qgsline3dsymbol.h

@@ -38,6 +38,13 @@ class _3D_EXPORT QgsLine3DSymbol : public QgsAbstract3DSymbol
     //! Constructor for QgsLine3DSymbol
     QgsLine3DSymbol() = default;
 
+    /**
+     * Creates a new QgsLine3DSymbol.
+     *
+     * Caller takes ownership of the returned symbol.
+     */
+    static QgsAbstract3DSymbol *create() SIP_FACTORY;
+
     QString type() const override { return "line"; }
     QgsAbstract3DSymbol *clone() const override SIP_FACTORY;
 

src/3d/symbols/qgspoint3dsymbol.cpp

@@ -26,6 +26,11 @@ QgsAbstract3DSymbol *QgsPoint3DSymbol::clone() const
   return new QgsPoint3DSymbol( *this );
 }
 
+QgsAbstract3DSymbol *QgsPoint3DSymbol::create()
+{
+  return new QgsPoint3DSymbol();
+}
+
 QgsPoint3DSymbol::QgsPoint3DSymbol()
 {
   setBillboardSymbol( static_cast<QgsMarkerSymbol *>( QgsSymbol::defaultSymbol( QgsWkbTypes::PointGeometry ) ) );

src/3d/symbols/qgspoint3dsymbol.h

@@ -43,6 +43,13 @@ class _3D_EXPORT QgsPoint3DSymbol : public QgsAbstract3DSymbol
     //! Copy Constructor for QgsPoint3DSymbol
     QgsPoint3DSymbol( const QgsPoint3DSymbol &other );
 
+    /**
+     * Creates a new QgsPoint3DSymbol.
+     *
+     * Caller takes ownership of the returned symbol.
+     */
+    static QgsAbstract3DSymbol *create() SIP_FACTORY;
+
     QString type() const override { return "point"; }
     QgsAbstract3DSymbol *clone() const override SIP_FACTORY;
 

src/3d/symbols/qgspolygon3dsymbol.cpp

@@ -84,3 +84,8 @@ void QgsPolygon3DSymbol::readXml( const QDomElement &elem, const QgsReadWriteCon
     mEdgeColor = QgsSymbolLayerUtils::decodeColor( elemEdges.attribute( QStringLiteral( "color" ) ) );
   }
 }
+
+QgsAbstract3DSymbol *QgsPolygon3DSymbol::create()
+{
+  return new QgsPolygon3DSymbol();
+}

src/3d/symbols/qgspolygon3dsymbol.h

@@ -45,6 +45,13 @@ class _3D_EXPORT QgsPolygon3DSymbol : public QgsAbstract3DSymbol
     void writeXml( QDomElement &elem, const QgsReadWriteContext &context ) const override;
     void readXml( const QDomElement &elem, const QgsReadWriteContext &context ) override;
 
+    /**
+     * Creates a new QgsPolygon3DSymbol.
+     *
+     * Caller takes ownership of the returned symbol.
+     */
+    static QgsAbstract3DSymbol *create() SIP_FACTORY;
+
     //! Returns method that determines altitude (whether to clamp to feature to terrain)
     Qgs3DTypes::AltitudeClamping altitudeClamping() const { return mAltClamping; }
     //! Sets method that determines altitude (whether to clamp to feature to terrain)

tests/src/3d/testqgs3dsymbolregistry.cpp

@@ -20,6 +20,7 @@
 
 #include <QObject>
 #include "qgstest.h"
+#include "qgs3d.h"
 
 //dummy symbol for testing
 class Dummy3DSymbol : public QgsAbstract3DSymbol
@@ -101,6 +102,10 @@ void TestQgs3DSymbolRegistry::instanceHasDefaultSymbols()
   //check that symbol registry is initially populated with some symbols
   //(assumes that there is some default symbols)
   Qgs3DSymbolRegistry *registry = QgsApplication::symbol3DRegistry();
+
+  // should be empty until initialized
+  QVERIFY( registry->symbolTypes().empty() );
+  Qgs3D::initialize();
   QVERIFY( registry->symbolTypes().length() > 0 );
 }