diff --git a/SlnkDWFCom/SLNKContour.cpp b/SlnkDWFCom/SLNKContour.cpp
index 54409ec..d44b355 100644
--- a/SlnkDWFCom/SLNKContour.cpp
+++ b/SlnkDWFCom/SLNKContour.cpp
@@ -14,27 +14,34 @@
 void CSLNKContour::SetImpl(CSLNKContourImpl * pSLNKContour)
 {
 	m_SLNKContour = pSLNKContour;
-	if (m_SLNKContour->m_fromSymbol) return; // Die zijn vast nog niet getransformeerd
+	m_doneBounds = false;
+}
 
-	WT_Logical_Box bx = pSLNKContour->bounds();
+void CSLNKContour::calculateBounds()
+{
+	if (m_doneBounds)
+		return;
+	m_doneBounds = true;
+
+	WT_Logical_Box bx = m_SLNKContour->bounds(); // Als je hierna nog punten toevoegt heb je een probleem
 
 	WT_Point3D dwgPt;
 	CComQIPtr<IDWGPoint> pt;
 
-	dwgPt = pSLNKContour->m_parentWhipFile->m_contunits.transform(bx.minpt());
+	dwgPt = m_SLNKContour->m_parentWhipFile->m_contunits.transform(bx.minpt());
 	m_dwgBounding->get_min(&pt);
 	pt->put_DwgX(dwgPt.m_x);
 	pt->put_DwgY(dwgPt.m_y);
 	pt.Release();
 
-	dwgPt = pSLNKContour->m_parentWhipFile->m_contunits.transform(bx.maxpt());
+	dwgPt = m_SLNKContour->m_parentWhipFile->m_contunits.transform(bx.maxpt());
 	m_dwgBounding->get_max(&pt);
 	pt->put_DwgX(dwgPt.m_x);
 	pt->put_DwgY(dwgPt.m_y);
 	pt.Release();
 
-	WT_Logical_Point lp = CSLNKContourImpl::Centroid(*pSLNKContour);
-	dwgPt = pSLNKContour->m_parentWhipFile->m_contunits.transform(lp);
+	WT_Logical_Point lp = CSLNKContourImpl::Centroid(*m_SLNKContour);
+	dwgPt = m_SLNKContour->m_parentWhipFile->m_contunits.transform(lp);
 	m_dwgCenter->put_DwgX(dwgPt.m_x);
 	m_dwgCenter->put_DwgY(dwgPt.m_y);
 };
@@ -98,6 +105,7 @@ STDMETHODIMP CSLNKContour::get_Extents(IBoundingBox** pVal)
 	if (m_SLNKContour->m_fromSymbol)
 		return E_NOTIMPL; // (nog) niet op symbolen
 
+	calculateBounds();
 	return m_dwgBounding->QueryInterface(IID_IBoundingBox, (void**)pVal);
 }
 
@@ -105,6 +113,8 @@ STDMETHODIMP CSLNKContour::get_Center(IDWGPoint** pVal)
 {
 	if (m_SLNKContour->m_fromSymbol)
 		return E_NOTIMPL; // (nog) niet op symbolen
+
+	calculateBounds();
 	return m_dwgCenter->QueryInterface(IID_IDWGPoint, (void**)pVal);
 }
 
diff --git a/SlnkDWFCom/SLNKContour.h b/SlnkDWFCom/SLNKContour.h
index ff6eff3..f73efb7 100644
--- a/SlnkDWFCom/SLNKContour.h
+++ b/SlnkDWFCom/SLNKContour.h
@@ -79,9 +79,11 @@ END_COM_MAP()
 		HRESULT hr = pParent->QueryInterface(IID_IWhipFile, (void **)&m_parent_iWhipFile);
 	};
 	void SetImpl(CSLNKContourImpl * pSLNKContour);
+	void calculateBounds();
 
 private:
 	CSLNKContourImpl * m_SLNKContour;
+	bool m_doneBounds; // zijn de volgende twee bepaald?
 	CComQIPtr<IDWGPoint> m_dwgCenter; 
 	CComQIPtr<IBoundingBox> m_dwgBounding; 
 	CComQIPtr<IWhipFile> m_parent_iWhipFile; // Om scope levend te houden
diff --git a/SlnkDWFImpl/SLNKContourImpl.cpp b/SlnkDWFImpl/SLNKContourImpl.cpp
index 896e47b..4017d92 100644
--- a/SlnkDWFImpl/SLNKContourImpl.cpp
+++ b/SlnkDWFImpl/SLNKContourImpl.cpp
@@ -325,7 +325,7 @@ WT_Logical_Point CSLNKContourImpl::LabelPosition(LABELPOS pos /*= LABEL_DEFAULT*
 	return WT_Logical_Point((WT_Integer32)(ptx / dDWFArea6), (WT_Integer32)(pty / dDWFArea6));
 }
 
-void CSLNKContourImpl::SerializeLabel(WT_File &my_file, 
+void CSLNKContourImpl::SerializeLabel(WT_File &my_file,
 									  double scale,
 									  HDC myDC)
 {
@@ -682,6 +682,12 @@ WT_Result CSLNKContourImpl::serialize(WT_File & file, BOOL solidOnly, BOOL forFi
 			file.desired_rendition().line_weight() = myRound(m_Lineweight * scale);
 			// Fraaier bij lijndikte aan begin/eind
 			file.desired_rendition().line_style().line_end_cap() = WT_Line_Style::Round_Cap;
+			
+			// Als eerste punt ongelijk aan laatste punt dan points() eentje uitbreiden
+			// De polygon sluit vanzelf wel maar deze polyline niet
+			if (count() > 2 && (points()[0].m_x != points()[count()-1].m_x || points()[0].m_y != points()[count()-1].m_y))
+			    AddPoint(points()[0]);
+
 			WT_Polyline my_line( count(), points(), WD_False);
 			my_line.serialize(file);
 		}
@@ -691,8 +697,15 @@ WT_Result CSLNKContourImpl::serialize(WT_File & file, BOOL solidOnly, BOOL forFi
 
 void CSLNKContourImpl::AddPoint(double pValX, double pValY, WT_Units units)
 {
-	bool wasEmpty = (points()[0].m_x == INT_MAX && 
+	AddPoint(units.transform(WT_Point3D(pValX, pValY)));
+}
+
+void CSLNKContourImpl::AddPoint(WT_Logical_Point pt)
+{
+	bool wasEmpty = (points()[0].m_x == INT_MAX &&
 		             points()[0].m_y == INT_MAX);
+
+	// TODO: Overflow controle?
 	WT_Logical_Point *pts = new WT_Logical_Point[count()+1];
 	int i;
 	for (i = 0; i < count(); i++)
@@ -700,8 +713,8 @@ void CSLNKContourImpl::AddPoint(double pValX, double pValY, WT_Units units)
 		pts[i] = points()[i];
 	}
 	// Het nieuwe punt
-	pts[i] = units.transform(WT_Point3D(pValX, pValY));
-	
+	pts[i] = pt;
+
 	// Bij wasEmpty het eerste dummy punt overslaan
 	set(wasEmpty?1:(count() + 1), &pts[wasEmpty?1:0], true);
 
@@ -710,5 +723,4 @@ void CSLNKContourImpl::AddPoint(double pValX, double pValY, WT_Units units)
 		m_ptLabel = points()[0];
 
 	delete[] pts;
-
 }
\ No newline at end of file
diff --git a/SlnkDWFImpl/SLNKContourImpl.h b/SlnkDWFImpl/SLNKContourImpl.h
index 20c2337..6d8365e 100644
--- a/SlnkDWFImpl/SLNKContourImpl.h
+++ b/SlnkDWFImpl/SLNKContourImpl.h
@@ -67,5 +67,6 @@ public:
 								  double scale,
 								  HDC myDC, int width=-2);
 	void AddPoint(double pValX, double pValY, WT_Units units);
+	void AddPoint(WT_Logical_Point pt);
 	static WT_Integer32 m_next_node_num;
 };