1 files changed, 3 insertions, 2 deletions
diff --git a/geometry.h b/geometry.h
index c32b3ea..a272b2c 100644
--- a/geometry.h
+++ b/geometry.h
@@ -39,13 +39,14 @@ typedef struct _VERTEX_LIST {
 } VERTEX_LIST, POLYGON;
 
 
-void addVertex(VERTEX_LIST *list, VERTEX *v);
-void insertVertex(VERTEX_LIST *list, VERTEX *v, unsigned int n);
+void addVertex(VERTEX_LIST *list, const VERTEX *v);
+void insertVertex(VERTEX_LIST *list, const VERTEX *v, unsigned int n);
 void deleteVertex(VERTEX_LIST *list, unsigned int n);
 
 double vertexDistanceSquare(const VERTEX *v1, const VERTEX *v2);
 double vertexDistance(const VERTEX *v1, const VERTEX *v2);
 
+int vertexOnLine(const VERTEX *v, const LINE *l);
 int vertexInRect(const VERTEX *v, const RECTANGLE *rect);
 gboolean vertexInPolygon(const VERTEX *v, const POLYGON *p);