Add ofPolyline::removeVertex(...) (#6400)

CHANGELOG.md

@@ -1,6 +1,10 @@
 
 CORE
 ----
+
+### Graphics
+- ofPolyline::removeVertex( ... ) added.
+
 ### utils
 - ofXML - provided access to the underlying pugi::xml_node method "getParent()" 
 

libs/openFrameworks/graphics/ofPolyline.h

@@ -108,6 +108,15 @@ class ofPolyline_ {
 	void insertVertex(const T &p, int index);
 	void insertVertex(float x, float y, float z, int index);
 
+
+	/// \brief Remove a vertex at a given index.
+	///
+	/// This function print an error and ignore the input if the index is
+	/// invalid. When a vertex is removed, the internal caches are cleared.
+	///
+	/// \param index The index of the vertex to remove.
+	void removeVertex(int index);
+
 	/// \brief Resize the number of points in the ofPolyline to the value
 	/// passed in.
 	void resize(size_t size);

libs/openFrameworks/graphics/ofPolyline.inl

@@ -93,6 +93,19 @@ void ofPolyline_<T>::insertVertex(float x, float y, float z, int index) {
 }
 
 
+//----------------------------------------------------------
+template<class T>
+void ofPolyline_<T>::removeVertex(int index) {
+	if(index >= points.size()){
+		ofLogError("ofPolyline") << "removeVertex(): ignoring out of range index " << index << ", number of vertices is" << points.size();
+	}else{
+		curveVertices.clear();
+		points.erase(points.begin()+index);
+		flagHasChanged();
+	}
+}
+
+
 //----------------------------------------------------------
 template<class T>
 size_t ofPolyline_<T>::size() const {