Add `ScaleSurfaceDnCmd`

src/Commands/ScaleSurfaceDnCmd.cpp

@@ -0,0 +1,23 @@
+#include "ScaleSurfaceDnCmd.h"
+
+namespace ofx {
+namespace piMapper {
+
+ScaleSurfaceDnCmd::ScaleSurfaceDnCmd(BaseSurface * selectedSurface, float by){
+	_selectedSurface = selectedSurface;
+	_by = by;
+}
+
+void ScaleSurfaceDnCmd::exec(){
+	ofLogNotice("ScaleSurfaceDnCmd", "exec");
+	_selectedSurface->scaleTo(1.0f - _by);
+}
+
+void ScaleSurfaceDnCmd::undo(){
+	ofLogNotice("ScaleSurfaceCmd", "undo");
+	_selectedSurface->scaleTo(1.0f / (1.0f - _by));
+}
+
+} // namespace piMapper
+} // namespace ofx
+

src/Commands/ScaleSurfaceDnCmd.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "BaseCmd.h"
+#include "BaseSurface.h"
+
+namespace ofx {
+namespace piMapper {
+
+class ScaleSurfaceDnCmd : public BaseUndoCmd {
+
+	public:
+		ScaleSurfaceDnCmd(BaseSurface * selectedSurface, float by);
+		void exec();
+		void undo();
+
+	private:
+		BaseSurface * _selectedSurface;
+	
+		float _by;
+
+};
+
+} // namespace piMapper
+} // namespace ofx
+