Fix crash in arrow symbol layer

qgis · Jun 14, 2016 · 09b6d5893925c326d44bb3e8c0e1f3efbc710838 · 09b6d58
1 parent 9df87a6
commit 09b6d5893925c326d44bb3e8c0e1f3efbc710838
Unified Split

Showing with 9 additions and 6 deletions.

+9 −6 src/core/symbology-ng/qgsarrowsymbollayer.cpp
diff --git a/src/core/symbology-ng/qgsarrowsymbollayer.cpp b/src/core/symbology-ng/qgsarrowsymbollayer.cpp
@@ -762,13 +762,16 @@ void QgsArrowSymbolLayer::renderPolyline( const QPolygonF& points, QgsSymbolV2Re
     {
       _resolveDataDefined( context );
 
-      // origin point
-      QPointF po( points.at( 0 ) );
-      // destination point
-      QPointF pd( points.back() );
+      if ( !points.isEmpty() )
+      {
+        // origin point
+        QPointF po( points.at( 0 ) );
+        // destination point
+        QPointF pd( points.back() );
 
-      QPolygonF poly = straightArrow( po, pd, mScaledArrowStartWidth, mScaledArrowWidth, mScaledHeadWidth, mScaledHeadHeight, mComputedHeadType, mComputedArrowType, mScaledOffset );
-      mSymbol->renderPolygon( poly, /* rings */ nullptr, context.feature(), context.renderContext() );
+        QPolygonF poly = straightArrow( po, pd, mScaledArrowStartWidth, mScaledArrowWidth, mScaledHeadWidth, mScaledHeadHeight, mComputedHeadType, mComputedArrowType, mScaledOffset );
+        mSymbol->renderPolygon( poly, /* rings */ nullptr, context.feature(), context.renderContext() );
+      }
     }
     else
     {