Improve Application::eraseSurface()

src/Application/Application.cpp

@@ -211,8 +211,9 @@ void Application::createSurface(SurfaceType type){
 }
 
 void Application::eraseSurface(int i){
-	getCmdManager()->exec(
-		new RmSurfaceCmd(getSurfaceManager(), i));
+	if(i >= 0 && i < getSurfaceManager()->getActivePreset()->getSurfaces().size()){
+		getCmdManager()->exec(new RmSurfaceCmd(getSurfaceManager(), i));
+	}
 }
 
 void Application::setInfoText(string text){

src/Application/Modes/ProjectionMappingMode.cpp

@@ -69,13 +69,7 @@ void ProjectionMappingMode::onKeyPressed(Application * app, ofKeyEventArgs & arg
 		 break;
 
 	 case OF_KEY_BACKSPACE:
-		 if(app->getSurfaceManager()->getSelectedSurface() == 0){
-			break;
-		 }
-		 app->getCmdManager()->exec(
-			 new RmSurfaceCmd(
-				app->getSurfaceManager(),
-				app->getSurfaceManager()->getSelectedSurfaceIndex()));
+		 app->eraseSurface(app->getSurfaceManager()->getSelectedSurfaceIndex());
 		 break;
 	 
 	 case 'p':

src/Application/Modes/ProjectionMappingMode.h

@@ -5,7 +5,6 @@
 #include "ofLog.h"
 #include "ofGraphics.h"
 #include "AddSurfaceCmd.h"
-#include "RmSurfaceCmd.h"
 #include "AddGridRowCmd.h"
 #include "RmGridRowCmd.h"
 #include "AddGridColCmd.h"