105 lines
3.0 KiB
C++
105 lines
3.0 KiB
C++
/****************************************************************************
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** Copyright (C) 2001-2011 Klaralvdalens Datakonsult AB. All rights reserved.
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**
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** This file is part of the KD Chart library.
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**
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** Licensees holding valid commercial KD Chart licenses may use this file in
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** accordance with the KD Chart Commercial License Agreement provided with
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** the Software.
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**
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**
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** This file may be distributed and/or modified under the terms of the
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** GNU General Public License version 2 and version 3 as published by the
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** Free Software Foundation and appearing in the file LICENSE.GPL.txt included.
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**
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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**
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** Contact info@kdab.com if any conditions of this licensing are not
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** clear to you.
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**
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**********************************************************************/
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#include "TernaryPoint.h"
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#include "TernaryConstants.h"
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#include <limits>
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#include <QChar>
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#include <QTextStream>
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TernaryPoint::TernaryPoint()
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: m_a( -1.0 )
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, m_b( -1.0 )
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{
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Q_ASSERT( !isValid() );
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}
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TernaryPoint::TernaryPoint( double a, double b )
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: m_a( -1.0 )
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, m_b( -1.0 )
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{
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set( a, b );
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}
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void TernaryPoint::set( double a, double b )
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{
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if ( a >= 0.0 && a <= 1.0
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&& b >= 0.0 && b <= 1.0
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&& 1.0 - a - b >= -2.0 * std::numeric_limits<double>::epsilon() ) {
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m_a = a;
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m_b = b;
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Q_ASSERT( isValid() ); // more a test for isValid
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} else {
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m_a = -1.0;
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m_b = -1.0;
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Q_ASSERT( ! isValid() );
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}
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}
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bool TernaryPoint::isValid() const
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{
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return
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m_a >= 0.0 && m_a <= 1.0
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&& m_b >= 0.0 && m_b <= 1.0
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&& 1.0 - m_a + m_b >= - std::numeric_limits<double>::epsilon();
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}
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QDebug operator<<( QDebug stream, const TernaryPoint& point )
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{
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QString string;
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QTextStream text( &string );
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text << "[TernaryPoint: ";
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if ( point.isValid() ) {
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text.setFieldWidth( 2 );
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text.setPadChar( QLatin1Char( '0' ) );
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text << ( int ) ( point.a() * 100.0 ) << "%|"
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<< ( int ) ( point.b() * 100.0 ) << "%|"
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<< ( int ) ( point.c() * 100.0 ) << "%]";
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} else {
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text << "a=" << point.a() << " - b=" << point.b() << " - INVALID]";
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}
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stream << string;
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return stream;
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}
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QPointF translate( const TernaryPoint& point )
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{
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if ( point.isValid() ) {
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// the position is calculated by
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// - first moving along the B-C line to the function that b
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// selects
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// - then traversing the selected function until we meet with
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// the function that A selects (which is a parallel of the B-C
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// line)
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QPointF bPosition( 1.0 - point.b(), 0.0 );
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QPointF aPosition( point.a() * AxisVector_C_A );
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QPointF result( bPosition + aPosition );
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return result;
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} else {
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qWarning() << "TernaryPoint::translate(TernaryPoint): cannot translate invalid ternary points:"
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<< point;
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return QPointF();
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}
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}
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