added intersect option to select to properly select features during select and identify operations. OGR does not support intersects so this is only implemented in the postgres provider

git-svn-id: http://svn.osgeo.org/qgis/trunk@739 c8812cc2-4d05-0410-92ff-de0c093fc19c

providers/ogr/qgsshapefileprovider.cpp

@@ -178,7 +178,7 @@ QgsFeature *QgsShapeFileProvider::getNextFeature(bool fetchAttributes)
 	* with calls to getFirstFeature and getNextFeature.
 	* @param mbr QgsRect containing the extent to use in selecting features
 	*/
-void QgsShapeFileProvider::select(QgsRect *rect)
+void QgsShapeFileProvider::select(QgsRect *rect, bool useIntersect)
 {
     // spatial query to select features
   //  std::cerr << "Selection rectangle is " << *rect << std::endl;

providers/ogr/qgsshapefileprovider.h

@@ -63,7 +63,7 @@ public:
 	* with calls to getFirstFeature and getNextFeature.
 	* @param mbr QgsRect containing the extent to use in selecting features
 	*/
-	void select(QgsRect *mbr);
+	void select(QgsRect *mbr, bool useIntersect=false);
 	/** 
 		* Set the data source specification. This may be a path or database
 	* connection string

providers/postgres/qgspostgresprovider.cpp

@@ -367,18 +367,26 @@ QgsFeature *QgsPostgresProvider::getNextFeature(bool fetchAttributes)
 	* with calls to getFirstFeature and getNextFeature.
 	* @param mbr QgsRect containing the extent to use in selecting features
 	*/
-void QgsPostgresProvider::select(QgsRect * rect)
+void QgsPostgresProvider::select(QgsRect * rect, bool useIntersect)
 {
     // spatial query to select features
     //--std::cout << "Selection rectangle is " << *rect << std::endl;
     QString declare = QString("declare qgisf binary cursor for select "
       + primaryKey  
       + ",asbinary(%1,'%2') as qgs_feature_geometry from %3").arg(geometryColumn).arg(endianString()).arg(tableName);
+      if(useIntersect){
+        declare += " where intersects(" + geometryColumn;
+        declare += ", GeometryFromText('BOX3D(" + rect->stringRep();
+        declare += ")'::box3d,";
+        declare += srid;
+        declare += "))";
+      }else{
         declare += " where " + geometryColumn;
         declare += " && GeometryFromText('BOX3D(" + rect->stringRep();
         declare += ")'::box3d,";
         declare += srid;
         declare += ")";
+      }
     //--std::cout << "Selecting features using: " << declare << std::endl;
     // set up the cursor
     if(ready){

providers/postgres/qgspostgresprovider.h

@@ -78,7 +78,7 @@ class QgsPostgresProvider:public QgsDataProvider
 	* with calls to getFirstFeature and getNextFeature.
 	* @param mbr QgsRect containing the extent to use in selecting features
 	*/
-    void select(QgsRect * mbr);
+    void select(QgsRect * mbr, bool useIntersect=false);
     /** 
 		* Set the data source specification. This must be a valid database
 	* connection string:

src/qgsdataprovider.h

@@ -56,10 +56,15 @@ public:
   virtual int fieldCount()=0;
 	/**
 	* Select features based on a bounding rectangle. Features can be retrieved 
-	* with calls to getFirstFeature and getNextFeature.
+	* with calls to getFirstFeature and getNextFeature. Request for features 
+  * for use in drawing the map canvas should set useIntersect to false.
 	* @param mbr QgsRect containing the extent to use in selecting features
+  * @param useIntersect If true, use the intersects function to select features
+  * rather than the PostGIS && operator that selects based on bounding box
+  * overlap.
+  *
 	*/
-	virtual void QgsDataProvider::select(QgsRect *mbr)=0;
+	virtual void QgsDataProvider::select(QgsRect *mbr, bool useIntersect=false)=0;
 	/** 
 		* Set the data source specification. This may be a path or database
 	* connection string

src/qgsvectorlayer.cpp

@@ -500,7 +500,7 @@ int QgsVectorLayer::endian()
 void QgsVectorLayer::identify(QgsRect * r)
 {
   	QApplication::setOverrideCursor(Qt::waitCursor);
-  dataProvider->select(r);
+  dataProvider->select(r,true);
 		int featureCount = 0;
     QgsFeature *fet;
 		unsigned char *feature;
@@ -633,7 +633,7 @@ void QgsVectorLayer::select(QgsRect * rect, bool lock)
 	}
     }
 
-    dataProvider->select(rect);
+    dataProvider->select(rect, true);
 	
     QgsFeature* fet;