Show some summary properties of selected crs in detailed crs selectio…

…n widget - geographic/non geographic and map units - whether crs is dynamic or not - ensemble details
qgis · May 10, 2021 · 4b8fe67 · 4b8fe67
1 parent 9e7e0d4
commit 4b8fe67
Showing 1 changed file with 41 additions and 3 deletions.
diff --git a/src/gui/qgsprojectionselectiontreewidget.cpp b/src/gui/qgsprojectionselectiontreewidget.cpp
@@ -22,6 +22,7 @@
 #include "qgssettings.h"
 #include "qgsrectangle.h"
 #include "qgscoordinatereferencesystemregistry.h"
+#include "qgsdatums.h"
 
 //qt includes
 #include <QFileInfo>
@@ -947,17 +948,54 @@ void QgsProjectionSelectionTreeWidget::updateBoundsPreview()
                    .arg( rect.yMaximum(), 0, 'f', 2 );
   }
 
+  QStringList properties;
+  if ( currentCrs.isGeographic() )
+    properties << tr( "Geographic (uses latitude and longitude for coordinates)" );
+  else
+  {
+    properties << tr( "Units: %1" ).arg( QgsUnitTypes::toString( currentCrs.mapUnits() ) );
+  }
+  properties << ( currentCrs.isDynamic() ? tr( "Dynamic (relies on a datum which is not plate-fixed)" ) : tr( "Static (relies on a datum which is plate-fixed)" ) );
+
+  try
+  {
+    const QgsDatumEnsemble ensemble = currentCrs.datumEnsemble();
+    if ( ensemble.isValid() )
+    {
+      QString id;
+      if ( !ensemble.code().isEmpty() )
+        id = QStringLiteral( "<i>%1</i> (%2:%3)" ).arg( ensemble.name(), ensemble.authority(), ensemble.code() );
+      else
+        id = QStringLiteral( "<i>%</i>”" ).arg( ensemble.name() );
+      if ( ensemble.accuracy() > 0 )
+      {
+        properties << tr( "Based on %1, which has a limited accuracy of <b>at best %2 meters</b>." ).arg( id ).arg( ensemble.accuracy() );
+      }
+      else
+      {
+        properties << tr( "Based on %1, which has a limited accuracy." ).arg( id );
+      }
+    }
+  }
+  catch ( QgsNotSupportedException & )
+  {
+
+  }
+
+  const QString propertiesString = QStringLiteral( "<dt><b>%1</b></dt><dd><ul><li>%2</li></ul></dd>" ).arg( tr( "Properties" ),
+                                   properties.join( QStringLiteral( "</li><li>" ) ) );
+
   const QString extentHtml = QStringLiteral( "<dt><b>%1</b></dt><dd>%2</dd>" ).arg( tr( "Extent" ), extentString );
-  const QString wktString = tr( "<dt><b>%1</b></dt><dd><code>%2</code></dd>" ).arg( tr( "WKT" ), currentCrs.toWkt( QgsCoordinateReferenceSystem::WKT_PREFERRED, true ).replace( '\n', QLatin1String( "<br>" ) ).replace( ' ', QLatin1String( "&nbsp;" ) ) );
-  const QString proj4String = tr( "<dt><b>%1</b></dt><dd><code>%2</code></dd>" ).arg( tr( "Proj4" ), currentCrs.toProj() );
+  const QString wktString = QStringLiteral( "<dt><b>%1</b></dt><dd><code>%2</code></dd>" ).arg( tr( "WKT" ), currentCrs.toWkt( QgsCoordinateReferenceSystem::WKT_PREFERRED, true ).replace( '\n', QLatin1String( "<br>" ) ).replace( ' ', QLatin1String( "&nbsp;" ) ) );
+  const QString proj4String = QStringLiteral( "<dt><b>%1</b></dt><dd><code>%2</code></dd>" ).arg( tr( "Proj4" ), currentCrs.toProj() );
 
 #ifdef Q_OS_WIN
   const int smallerPointSize = std::max( font().pointSize() - 1, 8 ); // bit less on windows, due to poor rendering of small point sizes
 #else
   const int smallerPointSize = std::max( font().pointSize() - 2, 6 );
 #endif
 
-  teProjection->setText( QStringLiteral( "<div style=\"font-size: %1pt\"><h3>%2</h3><dl>" ).arg( smallerPointSize ).arg( selectedName() ) + wktString + proj4String + extentHtml + QStringLiteral( "</dl></div>" ) );
+  teProjection->setText( QStringLiteral( "<div style=\"font-size: %1pt\"><h3>%2</h3><dl>" ).arg( smallerPointSize ).arg( selectedName() ) + propertiesString + wktString + proj4String + extentHtml + QStringLiteral( "</dl></div>" ) );
 }
 
 QStringList QgsProjectionSelectionTreeWidget::authorities()