Disable offset curve if geos version < 3.3

Author: mhugent

src/app/qgisapp.cpp

@@ -1018,7 +1018,10 @@ void QgisApp::createActionGroups()
   mMapToolGroup->addAction( mActionMeasureAngle );
   mMapToolGroup->addAction( mActionAddFeature );
   mMapToolGroup->addAction( mActionMoveFeature );
+#if defined(GEOS_VERSION_MAJOR) && defined(GEOS_VERSION_MINOR) && \
+    ((GEOS_VERSION_MAJOR>3) || ((GEOS_VERSION_MAJOR==3) && (GEOS_VERSION_MINOR>=3)))
   mMapToolGroup->addAction( mActionOffsetCurve );
+#endif
   mMapToolGroup->addAction( mActionReshapeFeatures );
   mMapToolGroup->addAction( mActionSplitFeatures );
   mMapToolGroup->addAction( mActionDeleteSelected );
@@ -1667,8 +1670,15 @@ void QgisApp::createCanvasTools()
   mMapTools.mAddFeature->setAction( mActionAddFeature );
   mMapTools.mMoveFeature = new QgsMapToolMoveFeature( mMapCanvas );
   mMapTools.mMoveFeature->setAction( mActionMoveFeature );
+  //need at least geos 3.3 for OffsetCurve tool
+#if defined(GEOS_VERSION_MAJOR) && defined(GEOS_VERSION_MINOR) && \
+  ((GEOS_VERSION_MAJOR>3) || ((GEOS_VERSION_MAJOR==3) && (GEOS_VERSION_MINOR>=3)))
   mMapTools.mOffsetCurve = new QgsMapToolOffsetCurve( mMapCanvas );
   mMapTools.mOffsetCurve->setAction( mActionOffsetCurve );
+#else
+  mAdvancedDigitizeToolBar->removeAction( mActionOffsetCurve );
+  mEditMenu->removeAction( mActionOffsetCurve );
+#endif //GEOS_VERSION
   mMapTools.mReshapeFeatures = new QgsMapToolReshape( mMapCanvas );
   mMapTools.mReshapeFeatures->setAction( mActionReshapeFeatures );
   mMapTools.mSplitFeatures = new QgsMapToolSplitFeatures( mMapCanvas );

src/app/qgsmaptooloffsetcurve.cpp

@@ -352,7 +352,16 @@ void QgsMapToolOffsetCurve::setOffsetForRubberBand( double offset, bool leftSide
     int joinStyle = s.value( "/qgis/digitizing/offset_join_style", 0 ).toInt();
     int quadSegments = s.value( "/qgis/digitizing/offset_quad_seg", 8 ).toInt();
     double mitreLimit = s.value( "/qgis/digitizine/offset_miter_limit", 5.0 ).toDouble();
-    GEOSGeometry* offsetGeom = GEOSSingleSidedBuffer( geosGeom, offset, quadSegments, joinStyle, mitreLimit, leftSide ? 1 : 0 );
+
+    GEOSGeometry* offsetGeom = 0;
+    //need at least geos 3.3 for OffsetCurve tool
+#if defined(GEOS_VERSION_MAJOR) && defined(GEOS_VERSION_MINOR) && \
+  ((GEOS_VERSION_MAJOR>3) || ((GEOS_VERSION_MAJOR==3) && (GEOS_VERSION_MINOR>=3)))
+    GEOSGeometry* offsetGeom = GEOSOffsetCurve( geosGeom, ( leftSide > 0 ) ? offset : -offset, quadSegments, joinStyle, mitreLimit );
+#else
+    return;
+#endif //GEOS_VERSION
+
     if ( !offsetGeom )
     {
       deleteRubberBandAndGeometry();
@@ -365,9 +374,6 @@ void QgsMapToolOffsetCurve::setOffsetForRubberBand( double offset, bool leftSide
       return;
     }
 
-    //GEOS >= 3.3
-    //GEOSGeometry* offsetGeom = GEOSOffsetCurve( geosGeom, (leftSide > 0) ? offset : -offset, quadSegments, joinStyle, mitreLimit );
-
     if ( offsetGeom )
     {
       mModifiedGeometry.fromGeos( offsetGeom );