#3297 Make casing shoe a right-angled triangle and refactor symbols

* Put plot symbol enum inside the symbol class.
* Put line style enums inside the line class.
* Add custom capability.

ApplicationCode/UserInterface/RiuQwtSymbol.h

@@ -0,0 +1,66 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2015-     Equinor ASA
+//  Copyright (C) 2015-     Ceetron Solutions AS
+// 
+//  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_symbol.h"
+#include <QString>
+
+//--------------------------------------------------------------------------------------------------
+/// This class overrides renderSymbols to draw symbols and labels.
+/// The label is only visible in the legend, while it is clipped in the plot.
+/// Therefore the method RiuQwtPlotCurve::drawSymbols also draw labels to have labels
+/// in the plot as well.
+//--------------------------------------------------------------------------------------------------
+class RiuQwtSymbol : public QwtSymbol
+{
+public:
+    enum LabelPosition
+    {
+        LabelAboveSymbol,
+        LabelRightOfSymbol
+    };
+    enum PointSymbolEnum
+    {
+        SYMBOL_NONE,
+        SYMBOL_ELLIPSE,
+        SYMBOL_RECT,
+        SYMBOL_DIAMOND,
+        SYMBOL_TRIANGLE,
+        SYMBOL_CROSS,
+        SYMBOL_XCROSS,
+        SYMBOL_DOWN_TRIANGLE,
+        SYMBOL_LEFT_TRIANGLE,
+        SYMBOL_RIGHT_TRIANGLE
+    };
+
+    RiuQwtSymbol(PointSymbolEnum riuStyle, const QString& label, LabelPosition labelPosition = LabelAboveSymbol);
+
+    virtual void renderSymbols(QPainter *painter, const QPointF *points, int numPoints) const override;
+    void         renderSymbolLabel(QPainter *painter, const QPointF& position) const;
+    QString label() const { return m_label; }
+
+    void setLabelPosition(LabelPosition labelPosition);
+
+private:
+    QString       m_label;
+    LabelPosition m_labelPosition;
+};
+
+