Add getSelectedSurface()

src/ofxPiMapper.cpp

@@ -190,6 +190,10 @@ unsigned int ofxPiMapper::getNumSurfaces(){
 	return _application.getSurfaceManager()->getActivePreset()->getSurfaces().size();
 }
 
+int ofxPiMapper::getSelectedSurface(){
+	return _application.getSurfaceManager()->getSelectedSurfaceIndex();
+}
+
 void ofxPiMapper::setInfoText(string text){
 	_application.setInfoText(text);
 }

src/ofxPiMapper.h

@@ -47,6 +47,7 @@ class ofxPiMapper {
 	
 		// Surfaces, active preset
 		unsigned int getNumSurfaces();
+		int getSelectedSurface();
 		void selectSurface(int i);
 		void togglePerspective();
 		void selectNextSurface();