122 lines
3.1 KiB
C++
122 lines
3.1 KiB
C++
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* QwtPolar Widget Library
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* Copyright (C) 2008 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#include "qwt_point_polar.h"
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#include "qwt_math.h"
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#if QT_VERSION < 0x040601
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#define qAtan2(y, x) ::atan2(y, x)
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#endif
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/*!
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Convert and assign values from a point in Cartesian coordinates
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\param p Point in Cartesian coordinates
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\sa setPoint(), toPoint()
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*/
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QwtPointPolar::QwtPointPolar( const QPointF &p )
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{
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d_radius = qSqrt( qwtSqr( p.x() ) + qwtSqr( p.y() ) );
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d_azimuth = qAtan2( p.y(), p.x() );
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}
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/*!
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Convert and assign values from a point in Cartesian coordinates
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\param p Point in Cartesian coordinates
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*/
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void QwtPointPolar::setPoint( const QPointF &p )
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{
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d_radius = qSqrt( qwtSqr( p.x() ) + qwtSqr( p.y() ) );
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d_azimuth = qAtan2( p.y(), p.x() );
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}
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/*!
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Convert and return values in Cartesian coordinates
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\return Converted point in Cartesian coordinates
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\note Invalid or null points will be returned as QPointF(0.0, 0.0)
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\sa isValid(), isNull()
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*/
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QPointF QwtPointPolar::toPoint() const
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{
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if ( d_radius <= 0.0 )
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return QPointF( 0.0, 0.0 );
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const double x = d_radius * qCos( d_azimuth );
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const double y = d_radius * qSin( d_azimuth );
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return QPointF( x, y );
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}
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/*!
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\brief Compare 2 points
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Two points are equal to each other if radius and
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azimuth-coordinates are the same. Points are not equal, when
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the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).
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\return True if the point is equal to other; otherwise return false.
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\sa normalized()
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*/
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bool QwtPointPolar::operator==( const QwtPointPolar &other ) const
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{
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return d_radius == other.d_radius && d_azimuth == other.d_azimuth;
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}
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/*!
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Compare 2 points
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Two points are equal to each other if radius and
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azimuth-coordinates are the same. Points are not equal, when
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the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).
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\return True if the point is not equal to other; otherwise return false.
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\sa normalized()
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*/
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bool QwtPointPolar::operator!=( const QwtPointPolar &other ) const
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{
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return d_radius != other.d_radius || d_azimuth != other.d_azimuth;
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}
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/*!
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Normalize radius and azimuth
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When the radius is < 0.0 it is set to 0.0. The azimuth is
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a value >= 0.0 and < 2 * M_PI.
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\return Normalized point
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*/
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QwtPointPolar QwtPointPolar::normalized() const
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{
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const double radius = qMax( d_radius, 0.0 );
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double azimuth = d_azimuth;
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if ( azimuth < -2.0 * M_PI || azimuth >= 2 * M_PI )
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azimuth = ::fmod( d_azimuth, 2 * M_PI );
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if ( azimuth < 0.0 )
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azimuth += 2 * M_PI;
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return QwtPointPolar( azimuth, radius );
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}
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#ifndef QT_NO_DEBUG_STREAM
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QDebug operator<<( QDebug debug, const QwtPointPolar &point )
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{
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debug.nospace() << "QwtPointPolar("
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<< point.azimuth() << "," << point.radius() << ")";
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return debug.space();
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}
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#endif
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