新增qwt源码版本

qwtdemo/qwt/qwt_round_scale_draw.h

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+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * 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_ROUND_SCALE_DRAW_H
+#define QWT_ROUND_SCALE_DRAW_H
+
+#include "qwt_global.h"
+#include "qwt_abstract_scale_draw.h"
+#include <qpoint.h>
+
+/*!
+  \brief A class for drawing round scales
+
+  QwtRoundScaleDraw can be used to draw round scales.
+  The circle segment can be adjusted by setAngleRange().
+  The geometry of the scale can be specified with
+  moveCenter() and setRadius().
+
+  After a scale division has been specified as a QwtScaleDiv object
+  using QwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s),
+  the scale can be drawn with the QwtAbstractScaleDraw::draw() member.
+*/
+
+class QWT_EXPORT QwtRoundScaleDraw: public QwtAbstractScaleDraw
+{
+public:
+    QwtRoundScaleDraw();
+    virtual ~QwtRoundScaleDraw();
+
+    void setRadius( double radius );
+    double radius() const;
+
+    void moveCenter( double x, double y );
+    void moveCenter( const QPointF & );
+    QPointF center() const;
+
+    void setAngleRange( double angle1, double angle2 );
+
+    virtual double extent( const QFont & ) const;
+
+protected:
+    virtual void drawTick( QPainter *, double val, double len ) const;
+    virtual void drawBackbone( QPainter * ) const;
+    virtual void drawLabel( QPainter *, double val ) const;
+
+private:
+    QwtRoundScaleDraw( const QwtRoundScaleDraw & );
+    QwtRoundScaleDraw &operator=( const QwtRoundScaleDraw &other );
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+//! Move the center of the scale draw, leaving the radius unchanged
+inline void QwtRoundScaleDraw::moveCenter( double x, double y )
+{
+    moveCenter( QPointF( x, y ) );
+}
+
+#endif