Summary Plot: Add support for multiple plot axis.

ApplicationLibCode/UserInterface/RiuPlotAxis.h

@@ -0,0 +1,46 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2022-     Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include "RiaPlotDefines.h"
+
+class RiuPlotAxis
+{
+public:
+    explicit RiuPlotAxis();
+    explicit RiuPlotAxis( RiaDefines::PlotAxis axis );
+    explicit RiuPlotAxis( RiaDefines::PlotAxis axis, int index );
+    virtual ~RiuPlotAxis();
+
+    static RiuPlotAxis defaultLeft();
+    static RiuPlotAxis defaultRight();
+    static RiuPlotAxis defaultTop();
+    static RiuPlotAxis defaultBottom();
+
+    RiaDefines::PlotAxis axis() const;
+
+    int index() const;
+
+    bool operator<( const RiuPlotAxis& rhs ) const;
+    bool operator==( const RiuPlotAxis& rhs );
+
+private:
+    RiaDefines::PlotAxis m_axis;
+    int                  m_index;
+};