1 files changed, 3 insertions, 0 deletions
diff --git a/VertexProvider.h b/VertexProvider.h
index 2f4b3be..101098e 100644
--- a/VertexProvider.h
+++ b/VertexProvider.h
@@ -13,6 +13,9 @@ class VertexProvider {
     
     virtual void moveVertex(size_t id, float x, float y) {}
     virtual void rotateVertex(size_t id, Vertex m, float a) {}
+    
+    virtual bool canConnectVertex(size_t id) const {return false;}
+    virtual void connectVertex(size_t id) {}
 };
 
 #endif /*VERTEXPROVIDER_H_*/