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diff --git a/hammer/axes2.h b/hammer/axes2.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Defines a base set of services for operations in an orthorgraphic
+//			projection. This is used as a base class for the 2D view and for
+//			the tools that work in the 2D views.
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef AXES2_H
+#define AXES2_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "hammer_mathlib.h"
+
+class Axes2
+{
+public:
+	Axes2() 
+	{
+		bInvertHorz = bInvertVert = false;
+		axHorz = AXIS_X;
+		axVert = AXIS_Y;
+		axThird = AXIS_Z;
+	}
+
+	void SetAxes(int h, bool bInvertH, int v, bool bInvertV);
+	void SetAxes(Axes2 &axes);
+
+	bool bInvertHorz;	// Whether the horizontal axis is inverted.
+	bool bInvertVert;	// Whether the vertical axis is inverted.
+
+	int axHorz;			// Index of the horizontal axis (x=0, y=1, z=2)
+	int axVert;			// Index of the vertical axis (x=0, y=1, z=2)
+	int axThird;		// Index of the "out of the screen" axis (x=0, y=1, z=2)
+};
+
+#endif // AXES2_H