File indexing completed on 2024-12-08 06:35:36

 // SPDX-License-Identifier: LGPL-2.1-or-later
 //
 // SPDX-FileCopyrightText: 2011-2012 Florian Eßer <f.esser@rwth-aachen.de>
 //
 
 #include "ElevationProfilePlotAxis.h"
 
 #include "MarbleGlobal.h"
 #include "MarbleLocale.h"
 
 #include <qmath.h>
 
 namespace Marble
 {
 
 ElevationProfilePlotAxis::ElevationProfilePlotAxis()
     : m_minValue( 0.0 ),
       m_maxValue ( 0.0 ),
       m_displayScale( 1.0 ),
       m_pixelLength ( 0 ),
       m_minTickCount( 2 ),
       m_maxTickCount( 5 ),
       m_unitString( QString() )
 {
     // nothing to do...
 }
 
 void ElevationProfilePlotAxis::setRange(qreal minValue, qreal maxValue)
 {
     m_minValue = minValue;
     m_maxValue = maxValue;
     update();
 }
 
 void ElevationProfilePlotAxis::setLength(int length)
 {
     m_pixelLength = length;
     update();
 }
 
 void ElevationProfilePlotAxis::setTickCount( const int min, const int max )
 {
     m_minTickCount = min;
     m_maxTickCount = max;
 }
 
 void ElevationProfilePlotAxis::update()
 {
     updateTicks();
     updateScale();
 }
 
 qreal ElevationProfilePlotAxis::minValue() const
 {
     return m_minValue;
 }
 
 qreal ElevationProfilePlotAxis::maxValue() const
 {
     return m_maxValue;
 }
 
 qreal ElevationProfilePlotAxis::range() const
 {
     return m_maxValue - m_minValue;
 }
 
 qreal ElevationProfilePlotAxis::scale() const
 {
     return m_displayScale;
 }
 
 QString ElevationProfilePlotAxis::unit() const
 {
     return m_unitString;
 }
 
 AxisTickList ElevationProfilePlotAxis::ticks() const
 {
     return m_ticks;
 }
 
 void ElevationProfilePlotAxis::updateTicks()
 {
     m_ticks.clear();
     if( range() == 0 ) {
         return;
     }
 
     static QVector<int> niceIntervals = QVector<int>() << 10 << 20 << 25 << 30 << 50;
 
     const int exponent = qRound( log10( range() ) );
     const qreal factor = qPow( 10, 2 - exponent );
     const qreal tickRange = range() * factor;
 
     qreal stepWidth = niceIntervals.last();
     qreal error = tickRange;
     for ( const int i: niceIntervals ) {
         const qreal numTicks = tickRange / i;
         if ( numTicks < m_minTickCount || numTicks > m_maxTickCount ) {
             continue;
         }
         const qreal newError = qAbs( numTicks - qRound( numTicks ) );
         if ( newError < error ) {
             error = newError;
             stepWidth = i;
         }
     }
     stepWidth /= factor;
 
     qreal offset = 0;
     if ( fmod( m_minValue, stepWidth ) != 0 ) {
         offset = stepWidth - fmod( m_minValue, stepWidth );
     }
 
     qreal val = m_minValue + offset;
     int pos = m_pixelLength / range() * offset;
     m_ticks << AxisTick( pos, val );
     while( val < m_maxValue ) {
         val += stepWidth;
         pos += m_pixelLength / range() * stepWidth;
         if ( pos > m_pixelLength ) {
             break;
         }
         m_ticks << AxisTick( pos, val );
     }
 }
 
 void ElevationProfilePlotAxis::updateScale()
 {
     MarbleLocale::MeasurementSystem measurementSystem;
     measurementSystem = MarbleGlobal::getInstance()->locale()->measurementSystem();
     switch ( measurementSystem ) {
     case MarbleLocale::MetricSystem:
         if ( range() >= 10 * KM2METER ) {
             m_unitString = tr( "km" );
             m_displayScale = METER2KM;
         } else {
             m_unitString = tr( "m" );
             m_displayScale = 1.0;
         }
         break;
     case MarbleLocale::ImperialSystem:
         // FIXME: Do these values make sense?
         if ( range() >= 10 * KM2METER * MI2KM ) {
             m_unitString = tr( "mi" );
             m_displayScale = METER2KM * KM2MI;
         } else {
             m_unitString = tr( "ft" );
             m_displayScale = M2FT;
         }
         break;
 
     case MarbleLocale::NauticalSystem:
         m_unitString = tr("nm");
         m_displayScale = METER2KM * KM2NM;
         break;
     }
 }
 
 }
 
 #include "moc_ElevationProfilePlotAxis.cpp"