thx to Didier for the fix on compass

src/domain/UBGraphicsScene.cpp

@@ -680,6 +680,7 @@ void UBGraphicsScene::drawArcTo(const QPointF& pCenterPoint, qreal pSpanAngle)
     penWidth /= UBApplication::boardController->currentZoom();
 
     mArcPolygonItem = arcToPolygonItem(QLineF(pCenterPoint, mPreviousPoint), pSpanAngle, penWidth);
+    mArcPolygonItem->setStroke(mCurrentStroke);
     mAddedItems.insert(mArcPolygonItem);
     addItem(mArcPolygonItem);
 
@@ -2001,3 +2002,7 @@ void UBGraphicsScene::setToolCursor(int tool)
         hideEraser();
     }
 }
+
+void UBGraphicsScene::initStroke(){
+	mCurrentStroke = new UBGraphicsStroke();
+}

src/domain/UBGraphicsScene.h

@@ -271,6 +271,8 @@ class UBGraphicsScene: public UBCoreGraphicsScene, public UBItem
 			return mPreviousPoint;
 		}
 
+		void initStroke();
+
     public slots:
 
         void hideEraser();

src/tools/UBGraphicsCompass.cpp

@@ -192,6 +192,7 @@ void UBGraphicsCompass::mousePressEvent(QGraphicsSceneMouseEvent *event)
         {
             mSpanAngleInDegrees = 0;
             mSceneArcStartPoint = mapToScene(pencilPosition());
+            scene()->initStroke();
             scene()->moveTo(mSceneArcStartPoint);
         }