source: ntrip/trunk/BNC/qwt/qwt_point_polar.cpp@ 10496

Last change on this file since 10496 was 9383, checked in by stoecker, 4 years ago

update to qwt verion 6.1.1 to fix build with newer Qt5

File size: 3.1 KB
Line 
1/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * QwtPolar Widget Library
3 * Copyright (C) 2008 Uwe Rathmann
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the Qwt License, Version 1.0
7 *****************************************************************************/
8
9#include "qwt_point_polar.h"
10#include "qwt_math.h"
11
12#if QT_VERSION < 0x040601
13#define qAtan2(y, x) ::atan2(y, x)
14#endif
15
16/*!
17 Convert and assign values from a point in Cartesian coordinates
18
19 \param p Point in Cartesian coordinates
20 \sa setPoint(), toPoint()
21*/
22QwtPointPolar::QwtPointPolar( const QPointF &p )
23{
24 d_radius = qSqrt( qwtSqr( p.x() ) + qwtSqr( p.y() ) );
25 d_azimuth = qAtan2( p.y(), p.x() );
26}
27
28/*!
29 Convert and assign values from a point in Cartesian coordinates
30 \param p Point in Cartesian coordinates
31*/
32void QwtPointPolar::setPoint( const QPointF &p )
33{
34 d_radius = qSqrt( qwtSqr( p.x() ) + qwtSqr( p.y() ) );
35 d_azimuth = qAtan2( p.y(), p.x() );
36}
37
38/*!
39 Convert and return values in Cartesian coordinates
40
41 \return Converted point in Cartesian coordinates
42
43 \note Invalid or null points will be returned as QPointF(0.0, 0.0)
44 \sa isValid(), isNull()
45*/
46QPointF QwtPointPolar::toPoint() const
47{
48 if ( d_radius <= 0.0 )
49 return QPointF( 0.0, 0.0 );
50
51 const double x = d_radius * qCos( d_azimuth );
52 const double y = d_radius * qSin( d_azimuth );
53
54 return QPointF( x, y );
55}
56
57/*!
58 \brief Compare 2 points
59
60 Two points are equal to each other if radius and
61 azimuth-coordinates are the same. Points are not equal, when
62 the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).
63
64 \return True if the point is equal to other; otherwise return false.
65
66 \sa normalized()
67*/
68bool QwtPointPolar::operator==( const QwtPointPolar &other ) const
69{
70 return d_radius == other.d_radius && d_azimuth == other.d_azimuth;
71}
72
73/*!
74 Compare 2 points
75
76 Two points are equal to each other if radius and
77 azimuth-coordinates are the same. Points are not equal, when
78 the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).
79
80 \return True if the point is not equal to other; otherwise return false.
81 \sa normalized()
82*/
83bool QwtPointPolar::operator!=( const QwtPointPolar &other ) const
84{
85 return d_radius != other.d_radius || d_azimuth != other.d_azimuth;
86}
87
88/*!
89 Normalize radius and azimuth
90
91 When the radius is < 0.0 it is set to 0.0. The azimuth is
92 a value >= 0.0 and < 2 * M_PI.
93
94 \return Normalized point
95*/
96QwtPointPolar QwtPointPolar::normalized() const
97{
98 const double radius = qMax( d_radius, 0.0 );
99
100 double azimuth = d_azimuth;
101 if ( azimuth < -2.0 * M_PI || azimuth >= 2 * M_PI )
102 azimuth = ::fmod( d_azimuth, 2 * M_PI );
103
104 if ( azimuth < 0.0 )
105 azimuth += 2 * M_PI;
106
107 return QwtPointPolar( azimuth, radius );
108}
109
110#ifndef QT_NO_DEBUG_STREAM
111
112QDebug operator<<( QDebug debug, const QwtPointPolar &point )
113{
114 debug.nospace() << "QwtPointPolar("
115 << point.azimuth() << "," << point.radius() << ")";
116
117 return debug.space();
118}
119
120#endif
121
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