#3466 Add attribute items to legend by creating a new RiuQwtPlotItemGroup that combines sub-graphics

ApplicationCode/UserInterface/RiuQwtPlotItemGroup.h

@@ -0,0 +1,50 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2018-     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 "qwt_plot_item.h"
+
+class QwtGraphic;
+class QRectF;
+class QPainter;
+
+//==================================================================================================
+/// Class that can combine multiple Qwt plot items into one Qwt graphic with a combined legend.
+/// 
+//==================================================================================================
+class RiuQwtPlotItemGroup : public QwtPlotItem
+{
+public:
+    RiuQwtPlotItemGroup();
+    ~RiuQwtPlotItemGroup();
+
+    void addPlotItem(QwtPlotItem* plotItem);
+    void addLegendItem(QwtPlotItem* legendItem);
+
+    virtual int rtti() const override { return 5000; }
+    virtual void draw(QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const override;
+    virtual QRectF boundingRect() const override;
+    virtual QwtGraphic legendIcon(int index, const QSizeF &size) const override;
+
+private:
+
+    std::vector<QwtPlotItem*> m_plotItems;
+    std::vector<QwtPlotItem*> m_legendItems;
+};
+