Add clear() and getSurfaces() methods to SurfaceStack

src/Surfaces/SurfaceStack.cpp

@@ -41,6 +41,14 @@ void SurfaceStack::draw(){
 	}
 }
 
+void SurfaceStack::clear(){
+	for(int i = 0; i < size(); ++i){
+		ofRemoveListener(_surfaces[i]->verticesChangedEvent, this, &SurfaceStack::onVerticesChanged);
+		ofRemoveListener(_surfaces[i]->vertexChangedEvent, this, &SurfaceStack::onVertexChanged);
+	}
+	_surfaces.clear();
+}
+
 int SurfaceStack::size(){
 	return _surfaces.size();
 }

src/Surfaces/SurfaceStack.h

@@ -18,6 +18,7 @@ class SurfaceStack {
 		void erase(int i);
 		void swap(int a, int b);
 		void draw();
+		void clear();
 	
 		int size();
 
@@ -31,6 +32,8 @@ class SurfaceStack {
 		void onVerticesChanged(vector<ofVec3f> & vertices);
 		void onVertexChanged(int & i);
 	
+		vector<BaseSurface *> & getSurfaces(){ return _surfaces; };
+	
 	private:
 		SurfaceStack(){}