using of configured default map units per mm for legend symbols in case no BBOX parameter is passed

Author: signedav

python/server/auto_generated/qgsserverprojectutils.sip.in

@@ -161,6 +161,15 @@ Returns the maximum number of atlas features which can be printed in a request
 :param project: the QGIS project
 
 :return: the number of atlas features
+%End
+
+  double wmsDefaultMapUnitsPerMm( const QgsProject &project );
+%Docstring
+Returns the denominator of the default scale used in case of the scale is not given
+
+:param project: the QGIS project
+
+:return: the denominator of the scale
 %End
 
   bool wmsUseLayerIds( const QgsProject &project );

src/app/qgsprojectproperties.cpp

@@ -643,6 +643,8 @@ QgsProjectProperties::QgsProjectProperties( QgsMapCanvas *mapCanvas, QWidget *pa
 
   mWMSMaxAtlasFeaturesSpinBox->setValue( QgsProject::instance()->readNumEntry( QStringLiteral( "WMSMaxAtlasFeatures" ), QStringLiteral( "/" ), 1 ) );
 
+  mWMSDefaultMapUnitsPerMm->setValue( QgsProject::instance()->readDoubleEntry( QStringLiteral( "WMSDefaultMapUnitsPerMm" ), QStringLiteral( "/" ), 1 ) );
+
   mWMTSUrlLineEdit->setText( QgsProject::instance()->readEntry( QStringLiteral( "WMTSUrl" ), QStringLiteral( "/" ), QString() ) );
   mWMTSMinScaleLineEdit->setValue( QgsProject::instance()->readNumEntry( QStringLiteral( "WMTSMinScale" ), QStringLiteral( "/" ), 5000 ) );
 
@@ -1300,6 +1302,9 @@ void QgsProjectProperties::apply()
   int maxAtlasFeatures = mWMSMaxAtlasFeaturesSpinBox->value();
   QgsProject::instance()->writeEntry( QStringLiteral( "WMSMaxAtlasFeatures" ), QStringLiteral( "/" ), maxAtlasFeatures );
 
+  double defaultMapUnitsPerMm = mWMSDefaultMapUnitsPerMm->value();
+  QgsProject::instance()->writeEntry( QStringLiteral( "WMSDefaultMapUnitsPerMm" ), QStringLiteral( "/" ), defaultMapUnitsPerMm );
+
   QgsProject::instance()->writeEntry( QStringLiteral( "WMTSUrl" ), QStringLiteral( "/" ), mWMTSUrlLineEdit->text() );
   QgsProject::instance()->writeEntry( QStringLiteral( "WMTSMinScale" ), QStringLiteral( "/" ), mWMTSMinScaleLineEdit->value() );
   bool wmtsProject = false;

src/server/qgsserverprojectutils.cpp

@@ -116,6 +116,11 @@ int QgsServerProjectUtils::wmsMaxAtlasFeatures( const QgsProject &project )
   return project.readNumEntry( QStringLiteral( "WMSMaxAtlasFeatures" ), QStringLiteral( "/" ), 1 );
 }
 
+double QgsServerProjectUtils::wmsDefaultMapUnitsPerMm( const QgsProject &project )
+{
+  return project.readDoubleEntry( QStringLiteral( "WMSDefaultMapUnitsPerMm" ), QStringLiteral( "/" ), 1 );
+}
+
 bool QgsServerProjectUtils::wmsInfoFormatSia2045( const QgsProject &project )
 {
   QString sia2045 = project.readEntry( QStringLiteral( "WMSInfoFormatSIA2045" ), QStringLiteral( "/" ), "" );

src/server/qgsserverprojectutils.h

@@ -154,6 +154,13 @@ namespace QgsServerProjectUtils
    */
   SERVER_EXPORT int wmsMaxAtlasFeatures( const QgsProject &project );
 
+  /**
+   * Returns the denominator of the default scale used in case of the scale is not given
+   * \param project the QGIS project
+   * \return the denominator of the scale
+   */
+  SERVER_EXPORT double wmsDefaultMapUnitsPerMm( const QgsProject &project );
+
   /**
    * Returns if layer ids are used as name in WMS.
    * \param project the QGIS project

src/server/services/wms/qgswmsrenderer.cpp

@@ -117,7 +117,7 @@ namespace QgsWms
     QList<QgsMapLayer *> layers = mContext.layersToRender();
     configureLayers( layers );
 
-    // getting scale from bbox
+    // getting scale from bbox or default size
     QgsLegendSettings settings = mWmsParameters.legendSettings();
     if ( !mWmsParameters.bbox().isEmpty() )
     {
@@ -127,6 +127,11 @@ namespace QgsWms
       settings.setMapScale( mapSettings.scale() );
       settings.setMapUnitsPerPixel( mapSettings.mapUnitsPerPixel() );
     }
+    else
+    {
+      double defaultMapUnitsPerPixel = QgsServerProjectUtils::wmsDefaultMapUnitsPerMm( *mContext.project() ) / mContext.dotsPerMm();
+      settings.setMapUnitsPerPixel( defaultMapUnitsPerPixel );
+    }
 
     // init renderer
     QgsLegendRenderer renderer( &model, settings );