彻底改版2.0

third/3rd_qwt/qwt_point_polar.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
+ *****************************************************************************/
+
+/*! \file */
+#ifndef _QWT_POINT_POLAR_H_
+#define _QWT_POINT_POLAR_H_ 1
+
+#include "qwt_global.h"
+#include "qwt_math.h"
+#include <qpoint.h>
+#ifndef QT_NO_DEBUG_STREAM
+#include <qdebug.h>
+#endif
+
+/*!
+  \brief A point in polar coordinates
+
+  In polar coordinates a point is determined by an angle and a distance.
+  See http://en.wikipedia.org/wiki/Polar_coordinate_system
+*/
+
+class QWT_EXPORT QwtPointPolar
+{
+public:
+    QwtPointPolar();
+    QwtPointPolar( double azimuth, double radius );
+    QwtPointPolar( const QwtPointPolar & );
+    QwtPointPolar( const QPointF & );
+
+    void setPoint( const QPointF & );
+    QPointF toPoint() const;
+
+    bool isValid() const;
+    bool isNull() const;
+
+    double radius() const;
+    double azimuth() const;
+
+    double &rRadius();
+    double &rAzimuth();
+
+    void setRadius( double );
+    void setAzimuth( double );
+
+    bool operator==( const QwtPointPolar & ) const;
+    bool operator!=( const QwtPointPolar & ) const;
+
+    QwtPointPolar normalized() const;
+
+private:
+    double d_azimuth;
+    double d_radius;
+};
+
+/*!
+    Constructs a null point, with a radius and azimuth set to 0.0.
+    \sa QPointF::isNull()
+*/
+inline QwtPointPolar::QwtPointPolar():
+    d_azimuth( 0.0 ),
+    d_radius( 0.0 )
+{
+}
+
+/*!
+   Constructs a point with coordinates specified by radius and azimuth.
+
+   \param azimuth Azimuth
+   \param radius Radius
+*/
+inline QwtPointPolar::QwtPointPolar( double azimuth, double radius ):
+    d_azimuth( azimuth ),
+    d_radius( radius )
+{
+}
+
+/*!
+    Constructs a point using the values of the point specified.
+    \param other Other point
+*/
+inline QwtPointPolar::QwtPointPolar( const QwtPointPolar &other ):
+    d_azimuth( other.d_azimuth ),
+    d_radius( other.d_radius )
+{
+}
+
+//! Returns true if radius() >= 0.0
+inline bool QwtPointPolar::isValid() const
+{
+    return d_radius >= 0.0;
+}
+
+//! Returns true if radius() >= 0.0
+inline bool QwtPointPolar::isNull() const
+{
+    return d_radius == 0.0;
+}
+
+//! Returns the radius.
+inline double QwtPointPolar::radius() const
+{
+    return d_radius;
+}
+
+//! Returns the azimuth.
+inline double QwtPointPolar::azimuth() const
+{
+    return d_azimuth;
+}
+
+//! Returns the radius.
+inline double &QwtPointPolar::rRadius()
+{
+    return d_radius;
+}
+
+//! Returns the azimuth.
+inline double &QwtPointPolar::rAzimuth()
+{
+    return d_azimuth;
+}
+
+//! Sets the radius to radius.
+inline void QwtPointPolar::setRadius( double radius )
+{
+    d_radius = radius;
+}
+
+//! Sets the atimuth to atimuth.
+inline void QwtPointPolar::setAzimuth( double azimuth )
+{
+    d_azimuth = azimuth;
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+QWT_EXPORT QDebug operator<<( QDebug, const QwtPointPolar & );
+#endif
+
+inline QPoint qwtPolar2Pos( const QPoint &pole,
+    double radius, double angle )
+{
+    const double x = pole.x() + radius * qCos( angle );
+    const double y = pole.y() - radius * qSin( angle );
+
+    return QPoint( qRound( x ), qRound( y ) );
+}
+
+inline QPoint qwtDegree2Pos( const QPoint &pole,
+    double radius, double angle )
+{
+    return qwtPolar2Pos( pole, radius, angle / 180.0 * M_PI );
+}
+
+inline QPointF qwtPolar2Pos( const QPointF &pole,
+    double radius, double angle )
+{
+    const double x = pole.x() + radius * qCos( angle );
+    const double y = pole.y() - radius * qSin( angle );
+
+    return QPointF( x, y);
+}
+
+inline QPointF qwtDegree2Pos( const QPointF &pole,
+    double radius, double angle )
+{
+    return qwtPolar2Pos( pole, radius, angle / 180.0 * M_PI );
+}
+
+inline QPointF qwtFastPolar2Pos( const QPointF &pole,
+    double radius, double angle )
+{
+#if QT_VERSION < 0x040601
+    const double x = pole.x() + radius * ::cos( angle );
+    const double y = pole.y() - radius * ::sin( angle );
+#else
+    const double x = pole.x() + radius * qFastCos( angle );
+    const double y = pole.y() - radius * qFastSin( angle );
+#endif
+
+    return QPointF( x, y);
+}
+
+inline QPointF qwtFastDegree2Pos( const QPointF &pole,
+    double radius, double angle )
+{
+    return qwtFastPolar2Pos( pole, radius, angle / 180.0 * M_PI );
+}
+
+inline QwtPointPolar qwtFastPos2Polar( const QPointF &pos )
+{
+    return QwtPointPolar( qwtFastAtan2( pos.y(), pos.x() ),
+        qSqrt( qwtSqr( pos.x() ) + qwtSqr( pos.y() ) ) );
+}
+
+#endif