Warning, file /education/kalzium/src/spectrumwidget.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*
     SPDX-FileCopyrightText: 2005, 2006 Carsten Niehaus <cniehaus@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "spectrumwidget.h"
 
 #include "kalziumutils.h"
 
 #include <config-kalzium.h>
 
 #include <cmath>
 #include <element.h>
 
 #include "kalzium_debug.h"
 #include <QGlobalStatic>
 #include <QKeyEvent>
 #include <QPainter>
 #include <QPixmap>
 #include <QSizePolicy>
 
 #include <KUnitConversion/Converter>
 
 #if defined(HAVE_IEEEFP_H)
 #include <ieeefp.h>
 #endif
 
 SpectrumWidget::SpectrumWidget(QWidget *parent)
     : QWidget(parent)
 {
     m_startValue = 0;
     m_endValue = 0;
 
     m_LMBPointCurrent.setX(-1);
     m_LMBPointPress.setX(-1);
 
     m_realHeight = 200;
 
     m_gamma = 0.8;
     m_intensityMax = 255;
 
     setType(Prefs::spectrumType());
 
     setMinimumSize(400, 230);
     setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
     setAttribute(Qt::WA_OpaquePaintEvent, true);
     setContextMenuPolicy(Qt::PreventContextMenu);
 }
 
 void SpectrumWidget::paintEvent(QPaintEvent * /*e*/)
 {
     if (!m_spectrum) {
         return;
     }
 
     m_pixmap = QPixmap(width(), height());
     m_pixmap.fill();
 
     QPainter p;
     p.begin(&m_pixmap);
     p.fillRect(0, 0, width(), m_realHeight, Qt::black);
 
     paintBands(&p);
 
     drawTickmarks(&p);
 
     if (m_LMBPointPress.x() != -1 && m_LMBPointCurrent.x() != -1) {
         drawZoomLine(&p);
     }
 
     p.end();
 
     QPainter p2(this);
     p2.drawPixmap(0, 0, m_pixmap);
 }
 
 void SpectrumWidget::drawZoomLine(QPainter *p)
 {
     p->setPen(Qt::white);
     p->drawLine(m_LMBPointPress.x(), m_LMBPointPress.y(), m_LMBPointCurrent.x(), m_LMBPointPress.y());
     p->drawLine(m_LMBPointCurrent.x(), m_LMBPointPress.y() + 10, m_LMBPointCurrent.x(), m_LMBPointPress.y() - 10);
     p->drawLine(m_LMBPointPress.x(), m_LMBPointPress.y() + 10, m_LMBPointPress.x(), m_LMBPointPress.y() - 10);
 }
 
 void SpectrumWidget::paintBands(QPainter *p)
 {
     if (m_type == AbsorptionSpectrum) {
         for (double va = m_startValue; va <= m_endValue; va += 0.1) {
             int x = xPos(va);
             p->setPen(wavelengthToRGB(va));
             p->drawLine(x, 0, x, m_realHeight);
         }
 
         p->setPen(Qt::black);
     }
 
     int i = 0;
     int x = 0;
     double currentWavelength;
 
     foreach (Spectrum::peak *peak, m_spectrum->peaklist()) {
         currentWavelength = peak->wavelengthToUnit(Prefs::spectrumWavelengthUnit());
 
         if (currentWavelength < m_startValue || currentWavelength > m_endValue) {
             continue;
         }
 
         x = xPos(currentWavelength);
 
         switch (m_type) {
         case EmissionSpectrum:
             p->setPen(wavelengthToRGB(currentWavelength));
             p->drawLine(x, 0, x, m_realHeight - 1);
 
             p->setPen(Qt::black);
             p->drawLine(x, m_realHeight, x, m_realHeight);
             break;
 
         case AbsorptionSpectrum:
             p->setPen(Qt::black);
             p->drawLine(x, 0, x, m_realHeight - 1);
             break;
         }
 
         ++i;
     }
 }
 
 QColor SpectrumWidget::wavelengthToRGB(double wavelength)
 {
     double blue = 0.0, green = 0.0, red = 0.0, factor = 0.0;
 
     // wavelengthTo RGB function works with nanometers.
     wavelength = KUnitConversion::Value(wavelength, KUnitConversion::UnitId(Prefs::spectrumWavelengthUnit())).convertTo(KUnitConversion::Nanometer).number();
 
     int wavelength_ = (int)floor(wavelength);
 
     if (wavelength_ < 380 || wavelength_ > 780) {
         return {Qt::white};
     } else if (wavelength_ >= 380 && wavelength_ < 440) {
         red = -(wavelength - 440) / (440 - 380);
         green = 0.0;
         blue = 1.0;
     } else if (wavelength_ >= 440 && wavelength_ < 490) {
         red = 0.0;
         green = (wavelength - 440) / (490 - 440);
         blue = 1.0;
     } else if (wavelength_ >= 490 && wavelength_ < 510) {
         red = 0.0;
         green = 1.0;
         blue = -(wavelength - 510) / (510 - 490);
     } else if (wavelength_ >= 510 && wavelength_ < 580) {
         red = (wavelength - 510) / (580 - 510);
         green = 1.0;
         blue = 0.0;
     } else if (wavelength_ >= 580 && wavelength_ < 645) {
         red = 1.0;
         green = -(wavelength - 645) / (645 - 580);
         blue = 0.0;
     } else if (wavelength_ >= 645 && wavelength_ < 780) {
         red = 1.0;
         green = 0.0;
         blue = 0.0;
     }
 
     if (wavelength_ > 380 && wavelength_ <= 420) {
         factor = 0.3 + 0.7 * (wavelength - 380) / (420 - 380);
     } else if (wavelength_ > 420 && wavelength_ <= 701) {
         factor = 1.0;
     } else if (wavelength_ > 701 && wavelength_ <= 780) {
         factor = 0.3 + 0.7 * (780 - wavelength) / (780 - 700);
     } else {
         factor = 0.0;
     }
 
     return {Adjust(red, factor), Adjust(green, factor), Adjust(blue, factor)};
 }
 
 int SpectrumWidget::Adjust(double color, double /*factor*/)
 {
     if (color == 0.0) {
         return 0;
     } else {
         //         return qRound(m_intensityMax * pow(color*factor, m_gamma)); FIXME
         return m_intensityMax * color;
     }
 }
 
 void SpectrumWidget::drawTickmarks(QPainter *p)
 {
     // the size of the text on the tickmarks
     const int space = 20;
 
     // the distance between the tickmarks in pixel
     const int d = 10;
 
     // the total number of tickmarks to draw (small and long)
     const int numberOfTickmarks = (int)floor((double)(width() / d));
 
     double pos = 0.0;
 
     for (int i = 0; i < numberOfTickmarks; ++i) {
         if (i % 5 == 0) {
             // long tickmarks plus text
             p->drawLine(i * d, m_realHeight, i * d, m_realHeight + 10);
             if (i % 10 == 0 && i * d > space && i * d < width() - space) {
                 pos = (double)(i * d) / width();
                 p->fillRect(i * d - space, m_realHeight + 12, 2 * space, 15, Qt::white);
                 p->drawText(i * d - space, m_realHeight + 12, 2 * space, 15, Qt::AlignCenter, QString::number(KalziumUtils::strippedValue(Wavelength(pos))));
             }
         } else { // small tickmarks
             p->drawLine(i * d, m_realHeight, i * d, m_realHeight + 5);
         }
     }
 }
 
 void SpectrumWidget::keyPressEvent(QKeyEvent *e)
 {
     switch (e->key()) {
     case Qt::Key_Plus:
         slotZoomIn();
         break;
     case Qt::Key_Minus:
         slotZoomOut();
         break;
     }
 }
 
 void SpectrumWidget::slotZoomOut()
 {
     qCDebug(KALZIUM_LOG) << "SpectrumWidget::slotZoomOut() " << m_startValue << ":: " << m_endValue;
 
     double diff = m_endValue - m_startValue;
 
     double offset = diff * 0.05;
 
     m_endValue = m_endValue + offset;
     m_startValue = m_startValue - offset;
 
     // check for invalid values
     if (m_startValue < 0.0) {
         m_startValue = 0.0;
     }
 
     if (m_endValue > 10000.0) { // FIXME: Magic numbers...
         m_endValue = 40000.0;
     }
 
     setBorders(m_startValue, m_endValue);
 }
 
 void SpectrumWidget::setBorders(double left, double right)
 {
     qCDebug(KALZIUM_LOG) << "setBorders    " << left << ".." << right;
 
     m_startValue = left;
     m_endValue = right;
 
     // round the startValue down and the endValue up
     Q_EMIT bordersChanged(int(m_startValue + 0.5), int(m_endValue + 0.5));
 
     update();
 }
 
 void SpectrumWidget::slotZoomIn()
 {
     qCDebug(KALZIUM_LOG) << "SpectrumWidget::slotZoomIn() " << m_startValue << ":: " << m_endValue;
 
     double diff = m_endValue - m_startValue;
 
     double offset = diff * 0.05;
 
     m_endValue = m_endValue - offset;
     m_startValue = m_startValue + offset;
 
     setBorders(m_startValue, m_endValue);
 }
 
 void SpectrumWidget::mouseMoveEvent(QMouseEvent *e)
 {
     m_LMBPointCurrent = e->pos();
     update();
 }
 
 void SpectrumWidget::mousePressEvent(QMouseEvent *e)
 {
     if (e->button() == Qt::LeftButton) {
         m_LMBPointPress = e->pos();
     }
     if (e->button() == Qt::RightButton) {
         resetSpectrum();
     }
 
     findPeakFromMouseposition(Wavelength((double)e->pos().x() / width()));
 }
 
 void SpectrumWidget::findPeakFromMouseposition(double wavelength)
 {
     qCDebug(KALZIUM_LOG) << "SpectrumWidget::findPeakFromMouseposition()";
     Spectrum::peak *peak = nullptr;
 
     // find the difference in percent (1.0 is 100%, 0.1 is 10%)
     double dif = 0.0;
 
     bool foundWavelength = false;
 
     // find the highest intensity
     foreach (Spectrum::peak *currentPeak, m_spectrum->peaklist()) {
         double currentWavelength = currentPeak->wavelengthToUnit(Prefs::spectrumWavelengthUnit());
 
         double thisdif = currentWavelength / wavelength;
 
         if (thisdif < 0.9 || thisdif > 1.1) {
             continue;
         }
 
         if (thisdif > 1.0) { // convert for example 1.3 to 0.7
             thisdif = thisdif - 1;
             thisdif = 1 - thisdif;
         }
 
         if (thisdif > dif) {
             dif = thisdif;
             peak = currentPeak;
             foundWavelength = true;
         }
     }
 
     if (foundWavelength) {
         Q_EMIT peakSelected(peak);
     }
 }
 
 void SpectrumWidget::mouseReleaseEvent(QMouseEvent *e)
 {
     if (e->button() == Qt::LeftButton) {
         int left = (int)Wavelength((double)m_LMBPointPress.x() / width());
         int right = (int)Wavelength((double)e->pos().x() / width());
 
         if (left == right) {
             return;
         }
 
         if (left > right) {
             setBorders(right, left);
         } else {
             setBorders(left, right);
         }
     }
 
     m_LMBPointPress.setX(-1);
     m_LMBPointCurrent.setX(-1);
 }
 
 void SpectrumWidget::setSpectrum(Spectrum *spec)
 {
     m_spectrum = spec;
     resetSpectrum();
 }
 
 void SpectrumWidget::resetSpectrum()
 {
     // set the minimum and maximum peak to the min/max wavelength
     // plus/minus ten. This makes then always visible
     double minimumPeak = m_spectrum->minPeak(Prefs::spectrumWavelengthUnit()) - 20.0;
     double maximumPeak = m_spectrum->maxPeak(Prefs::spectrumWavelengthUnit()) + 20.0;
 
     setBorders(minimumPeak, maximumPeak);
 }