| 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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| 2 | * QwtPolar Widget Library
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| 3 | * Copyright (C) 2008 Uwe Rathmann
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| 4 | *
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| 5 | * This library is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the Qwt License, Version 1.0
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| 7 | *****************************************************************************/
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| 8 |
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| 9 | #include "qwt_point_polar.h"
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| 10 | #include "qwt_math.h"
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| 11 |
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| 12 | #if QT_VERSION < 0x040601
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| 13 | #define qAtan2(y, x) ::atan2(y, x)
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| 14 | #endif
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| 15 |
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| 16 | /*!
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| 17 | Convert and assign values from a point in Cartesian coordinates
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| 18 |
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| 19 | \param p Point in Cartesian coordinates
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| 20 | \sa setPoint(), toPoint()
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| 21 | */
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| 22 | QwtPointPolar::QwtPointPolar( const QPointF &p )
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| 23 | {
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| 24 | d_radius = qSqrt( qwtSqr( p.x() ) + qwtSqr( p.y() ) );
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| 25 | d_azimuth = qAtan2( p.y(), p.x() );
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| 26 | }
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| 27 |
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| 28 | /*!
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| 29 | Convert and assign values from a point in Cartesian coordinates
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| 30 | \param p Point in Cartesian coordinates
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| 31 | */
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| 32 | void QwtPointPolar::setPoint( const QPointF &p )
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| 33 | {
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| 34 | d_radius = qSqrt( qwtSqr( p.x() ) + qwtSqr( p.y() ) );
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| 35 | d_azimuth = qAtan2( p.y(), p.x() );
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| 36 | }
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| 37 |
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| 38 | /*!
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| 39 | Convert and return values in Cartesian coordinates
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| 40 |
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| 41 | \note Invalid or null points will be returned as QPointF(0.0, 0.0)
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| 42 | \sa isValid(), isNull()
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| 43 | */
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| 44 | QPointF QwtPointPolar::toPoint() const
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| 45 | {
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| 46 | if ( d_radius <= 0.0 )
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| 47 | return QPointF( 0.0, 0.0 );
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| 48 |
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| 49 | const double x = d_radius * qCos( d_azimuth );
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| 50 | const double y = d_radius * qSin( d_azimuth );
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| 51 |
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| 52 | return QPointF( x, y );
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| 53 | }
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| 54 |
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| 55 | /*!
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| 56 | Returns true if point1 is equal to point2; otherwise returns false.
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| 57 |
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| 58 | Two points are equal to each other if radius and
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| 59 | azimuth-coordinates are the same. Points are not equal, when
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| 60 | the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).
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| 61 |
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| 62 | \sa normalized()
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| 63 | */
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| 64 | bool QwtPointPolar::operator==( const QwtPointPolar &other ) const
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| 65 | {
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| 66 | return d_radius == other.d_radius && d_azimuth == other.d_azimuth;
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| 67 | }
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| 68 |
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| 69 | /*!
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| 70 | Returns true if point1 is not equal to point2; otherwise returns false.
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| 71 |
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| 72 | Two points are equal to each other if radius and
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| 73 | azimuth-coordinates are the same. Points are not equal, when
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| 74 | the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).
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| 75 |
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| 76 | \sa normalized()
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| 77 | */
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| 78 | bool QwtPointPolar::operator!=( const QwtPointPolar &other ) const
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| 79 | {
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| 80 | return d_radius != other.d_radius || d_azimuth != other.d_azimuth;
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| 81 | }
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| 82 |
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| 83 | /*!
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| 84 | Normalize radius and azimuth
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| 85 |
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| 86 | When the radius is < 0.0 it is set to 0.0. The azimuth is
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| 87 | a value >= 0.0 and < 2 * M_PI.
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| 88 | */
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| 89 | QwtPointPolar QwtPointPolar::normalized() const
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| 90 | {
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| 91 | const double radius = qMax( d_radius, 0.0 );
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| 92 |
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| 93 | double azimuth = d_azimuth;
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| 94 | if ( azimuth < -2.0 * M_PI || azimuth >= 2 * M_PI )
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| 95 | azimuth = ::fmod( d_azimuth, 2 * M_PI );
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| 96 |
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| 97 | if ( azimuth < 0.0 )
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| 98 | azimuth += 2 * M_PI;
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| 99 |
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| 100 | return QwtPointPolar( azimuth, radius );
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| 101 | }
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| 102 |
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| 103 | #ifndef QT_NO_DEBUG_STREAM
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| 104 |
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| 105 | QDebug operator<<( QDebug debug, const QwtPointPolar &point )
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| 106 | {
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| 107 | debug.nospace() << "QwtPointPolar("
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| 108 | << point.azimuth() << "," << point.radius() << ")";
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| 109 |
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| 110 | return debug.space();
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| 111 | }
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| 112 |
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| 113 | #endif
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| 114 |
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