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1e4e5fab04
- remove superfluous backslashes - fix QgsDebugMsg macro - disable code with #if 0/#endif instead of commenting it out - remove namespaces from ogr converter plugin git-svn-id: http://svn.osgeo.org/qgis/trunk@9218 c8812cc2-4d05-0410-92ff-de0c093fc19c
126 lines
3.1 KiB
C++
126 lines
3.1 KiB
C++
/***************************************************************************
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qgspoint.cpp - description
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-------------------
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begin : Sat Jun 22 2002
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copyright : (C) 2002 by Gary E.Sherman
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email : sherman at mrcc.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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/* $Id$ */
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#include "qgspoint.h"
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#include <cmath>
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#include <QTextStream>
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QgsPoint::QgsPoint( const QgsPoint& p )
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{
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m_x = p.x();
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m_y = p.y();
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}
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QString QgsPoint::toString() const
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{
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QString rep;
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QTextStream ot( &rep );
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ot.setRealNumberPrecision( 12 );
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ot << m_x << ", " << m_y;
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return rep;
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}
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QString QgsPoint::toString( int thePrecision ) const
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{
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QString rep = QString::number( m_x, 'f', thePrecision ) + QString( "," ) +
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QString::number( m_y, 'f', thePrecision );
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return rep;
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}
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QString QgsPoint::wellKnownText() const
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{
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return QString( "POINT(%1 %2)" ).arg( QString::number( m_x, 'f', 18 ) ).arg( QString::number( m_y, 'f', 18 ) );
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}
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double QgsPoint::sqrDist( double x, double y ) const
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{
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return ( m_x -x )*( m_x - x ) + ( m_y - y )*( m_y - y );
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}
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double QgsPoint::sqrDist( const QgsPoint& other ) const
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{
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return sqrDist( other.x(), other.y() );
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}
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// operators
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bool QgsPoint::operator==( const QgsPoint & other )
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{
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if (( m_x == other.x() ) && ( m_y == other.y() ) )
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return true;
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else
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return false;
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}
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bool QgsPoint::operator!=( const QgsPoint & other ) const
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{
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if (( m_x == other.x() ) && ( m_y == other.y() ) )
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return false;
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else
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return true;
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}
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QgsPoint & QgsPoint::operator=( const QgsPoint & other )
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{
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if ( &other != this )
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{
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m_x = other.x();
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m_y = other.y();
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}
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return *this;
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}
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void QgsPoint::multiply( const double& scalar )
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{
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m_x *= scalar;
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m_y *= scalar;
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}
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int QgsPoint::onSegment( const QgsPoint& a, const QgsPoint& b ) const
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{
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//algorithm from 'graphics GEMS', A. Paeth: 'A Fast 2D Point-on-line test'
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if (
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fabs(( b.y() - a.y() ) * ( m_x - a.x() ) - ( m_y - a.y() ) * ( b.x() - a.x() ) )
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>= qMax( fabs( b.x() - a.x() ), fabs( b.y() - a.y() ) )
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)
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{
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return 0;
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}
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if (( b.x() < a.x() && a.x() < m_x ) || ( b.y() < a.y() && a.y() < m_y ) )
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{
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return 1;
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}
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if (( m_x < a.x() && a.x() < b.x() ) || ( m_y < a.y() && a.y() < b.y() ) )
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{
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return 1;
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}
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if (( a.x() < b.x() && b.x() < m_x ) || ( a.y() < b.y() && b.y() < m_y ) )
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{
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return 3;
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}
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if (( m_x < b.x() && b.x() < a.x() ) || ( m_y < b.y() && b.y() < a.y() ) )
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{
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return 3;
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}
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return 2;
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}
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