Add shortcuts for `ScaleSurface*` commands

src/Application/ProjectionMappingState.cpp

@@ -272,6 +272,22 @@ void ProjectionMappingState::onKeyPressed(Application * app, ofKeyEventArgs & ar
 		 }
 		 break;
 		 
+	 case '+': // Scale surface up
+		 if(app->getSurfaceManager()->getSelectedSurface() != 0){
+			app->getCmdManager()->exec(
+				new ScaleSurfaceUpCmd(
+					app->getSurfaceManager()->getSelectedSurface(), 0.1f));
+		 }
+		 break;
+
+	 case '-': // Scale surface down
+		 if(app->getSurfaceManager()->getSelectedSurface() != 0){
+			app->getCmdManager()->exec(
+				new ScaleSurfaceDnCmd(
+					app->getSurfaceManager()->getSelectedSurface(), 0.1f));
+		 }
+		 break;
+		 
 	 default:
 		 break;
 	}

src/Application/ProjectionMappingState.h

@@ -25,6 +25,8 @@
 #include "ToggleAnimatedSourceCmd.h"
 #include "MvLayerUpCmd.h"
 #include "MvLayerDnCmd.h"
+#include "ScaleSurfaceUpCmd.h"
+#include "ScaleSurfaceDnCmd.h"
 #include "SurfaceType.h"
 #include "Gui.h"