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src/qwt_compass.h

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+/******************************************************************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QWT_COMPASS_H
+#define QWT_COMPASS_H
+
+#include "qwt_global.h"
+#include "qwt_dial.h"
+#include "qwt_round_scale_draw.h"
+
+class QwtCompassRose;
+class QString;
+template< class Key, class T > class QMap;
+
+
+/*!
+   \brief A special scale draw made for QwtCompass
+
+   QwtCompassScaleDraw maps values to strings using
+   a special map, that can be modified by the application
+
+   The default map consists of the labels N, NE, E, SE, S, SW, W, NW.
+
+   \sa QwtCompass
+ */
+class QWT_EXPORT QwtCompassScaleDraw : public QwtRoundScaleDraw
+{
+  public:
+    explicit QwtCompassScaleDraw();
+    explicit QwtCompassScaleDraw( const QMap< double, QString >& map );
+
+    virtual ~QwtCompassScaleDraw();
+
+    void setLabelMap( const QMap< double, QString >& map );
+    QMap< double, QString > labelMap() const;
+
+    virtual QwtText label( double value ) const QWT_OVERRIDE;
+
+  private:
+    class PrivateData;
+    PrivateData* m_data;
+};
+
+/*!
+   \brief A Compass Widget
+
+   QwtCompass is a widget to display and enter directions. It consists
+   of a scale, an optional needle and rose.
+
+   \image html dials1.png
+
+   \note The examples/dials example shows how to use QwtCompass.
+ */
+
+class QWT_EXPORT QwtCompass : public QwtDial
+{
+    Q_OBJECT
+
+  public:
+    explicit QwtCompass( QWidget* parent = NULL );
+    virtual ~QwtCompass();
+
+    void setRose( QwtCompassRose* rose );
+    const QwtCompassRose* rose() const;
+    QwtCompassRose* rose();
+
+  protected:
+    virtual void drawRose( QPainter*, const QPointF& center,
+        double radius, double north, QPalette::ColorGroup ) const;
+
+    virtual void drawScaleContents( QPainter*,
+        const QPointF& center, double radius ) const QWT_OVERRIDE;
+
+    virtual void keyPressEvent( QKeyEvent* ) QWT_OVERRIDE;
+
+  private:
+    class PrivateData;
+    PrivateData* m_data;
+};
+
+#endif