add some set function for boundary drawing

include/Algo/Render/GL2/topoRender.h

@@ -279,6 +279,12 @@ public:
 	 * @param ns distance shift along normals (use BB.diagSize()/100 is good approximation)
 	 */
 	void setNormalShift(float ns);
+
+	/**
+	 * @brief set boundary shift for boundary of dim 2 drawing
+	 * @param ns distance shift
+	 */
+	void setBoundaryShift(float bs);
 };
 
 // just for compatibility with old code

src/Algo/Render/topoRender.cpp

@@ -345,6 +345,17 @@ void TopoRender::toSVG(Utils::SVG::SVGOut& svg)
 }
 
 
+void TopoRender::setNormalShift(float ns)
+{
+	m_normalShift = ns;
+}
+
+void TopoRender::setBoundaryShift(float bs)
+{
+	m_boundShift = bs;
+}
+
+
 
 }//end namespace GL2