Possibility to ignore features in the avoid intersection function

qgis · Sep 25, 2012 · efc4cb6 · efc4cb6
1 parent 9a129cc
commit efc4cb6
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Showing 4 changed files with 26 additions and 9 deletions.
diff --git a/src/core/qgsgeometry.cpp b/src/core/qgsgeometry.cpp
@@ -6696,7 +6696,7 @@ bool QgsGeometry::deletePart( int partNum )
   return true;
 }
 
-int QgsGeometry::avoidIntersections()
+int QgsGeometry::avoidIntersections( QMap<QgsVectorLayer*, QSet<qint64> > ignoreFeatures )
 {
   int returnValue = 0;
 
@@ -6724,7 +6724,14 @@ int QgsGeometry::avoidIntersections()
     currentLayer = dynamic_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( *aIt ) );
     if ( currentLayer )
     {
-      if ( currentLayer->removePolygonIntersections( this ) != 0 )
+      QgsFeatureIds ignoreIds;
+      QMap<QgsVectorLayer*, QSet<qint64> >::const_iterator ignoreIt = ignoreFeatures.find( currentLayer );
+      if ( ignoreIt != ignoreFeatures.constEnd() )
+      {
+        ignoreIds = ignoreIt.value();
+      }
+
+      if ( currentLayer->removePolygonIntersections( this, ignoreIds ) != 0 )
       {
         returnValue = 3;
       }

diff --git a/src/core/qgsgeometry.h b/src/core/qgsgeometry.h
@@ -30,6 +30,9 @@ email                : morb at ozemail dot com dot au
 
 #include "qgspoint.h"
 #include "qgscoordinatetransform.h"
+#include <QSet>
+
+class QgsVectorLayer;
 
 /** polyline is represented as a vector of points */
 typedef QVector<QgsPoint> QgsPolyline;
@@ -429,9 +432,10 @@ class CORE_EXPORT QgsGeometry
      *          1 if geometry is not of polygon type,
      *          2 if avoid intersection would change the geometry type,
      *          3 other error during intersection removal
+     *  @ignoreFeatures possibility to give a list of features where intersections should be ignored
      *  @note added in 1.5
      */
-    int avoidIntersections();
+    int avoidIntersections( QMap<QgsVectorLayer*, QSet<qint64> > ignoreFeatures = QMap<QgsVectorLayer*, QSet<qint64> >() );
 
     class Error
     {

diff --git a/src/core/qgsvectorlayer.cpp b/src/core/qgsvectorlayer.cpp
@@ -430,8 +430,8 @@ unsigned char *QgsVectorLayer::drawLineString( unsigned char *feature, QgsRender
   // the rest of them so end the loop at that point.
   for ( int i = 0; i < nPoints; ++i )
   {
-    if ( qAbs( x.at(i) ) > QgsClipper::MAX_X ||
-         qAbs( y.at(i) ) > QgsClipper::MAX_Y )
+    if ( qAbs( x.at( i ) ) > QgsClipper::MAX_X ||
+         qAbs( y.at( i ) ) > QgsClipper::MAX_Y )
     {
       QgsClipper::trimFeature( x, y, true ); // true = polyline
       nPoints = x.size(); // trimming may change nPoints.
@@ -443,8 +443,8 @@ unsigned char *QgsVectorLayer::drawLineString( unsigned char *feature, QgsRender
   QPolygonF pa( nPoints );
   for ( int i = 0; i < nPoints; ++i )
   {
-    pa[i].setX( x.at(i) );
-    pa[i].setY( y.at(i) );
+    pa[i].setX( x.at( i ) );
+    pa[i].setY( y.at( i ) );
   }
 
   // The default pen gives bevelled joins between segements of the
@@ -2489,7 +2489,7 @@ int QgsVectorLayer::splitFeatures( const QList<QgsPoint>& splitLine, bool topolo
   return returnCode;
 }
 
-int QgsVectorLayer::removePolygonIntersections( QgsGeometry* geom )
+int QgsVectorLayer::removePolygonIntersections( QgsGeometry* geom, QgsFeatureIds ignoreFeatures )
 {
   if ( !hasGeometryType() )
     return 1;
@@ -2511,6 +2511,11 @@ int QgsVectorLayer::removePolygonIntersections( QgsGeometry* geom )
   QgsFeature f;
   while ( nextFeature( f ) )
   {
+    if ( ignoreFeatures.contains( f.id() ) )
+    {
+      continue;
+    }
+
     //call geometry->makeDifference for each feature
     QgsGeometry *currentGeom = f.geometry();
     if ( currentGeom )

diff --git a/src/core/qgsvectorlayer.h b/src/core/qgsvectorlayer.h
@@ -442,9 +442,10 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer
     /**Changes the specified geometry such that it has no intersections with other
      *  polygon (or multipolygon) geometries in this vector layer
      *  @param geom geometry to modify
+     *  @param ignoreFeatures list of feature ids where intersections should be ignored
      *  @return 0 in case of success
      */
-    int removePolygonIntersections( QgsGeometry* geom );
+    int removePolygonIntersections( QgsGeometry* geom, QgsFeatureIds ignoreFeatures = QgsFeatureIds() );
 
     /** Adds topological points for every vertex of the geometry.
      * @param geom the geometry where each vertex is added to segments of other features