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| |
| #include "spectrograph.h" |
| #include <QDebug> |
| #include <QMouseEvent> |
| #include <QPainter> |
| #include <QTimerEvent> |
| |
| const int NullTimerId = -1; |
| const int NullIndex = -1; |
| const int BarSelectionInterval = 2000; |
| |
| Spectrograph::Spectrograph(QWidget *parent) |
| : QWidget(parent) |
| , m_barSelected(NullIndex) |
| , m_timerId(NullTimerId) |
| , m_lowFreq(0.0) |
| , m_highFreq(0.0) |
| { |
| setMinimumHeight(100); |
| } |
| |
| Spectrograph::~Spectrograph() |
| { |
| |
| } |
| |
| void Spectrograph::setParams(int numBars, qreal lowFreq, qreal highFreq) |
| { |
| Q_ASSERT(numBars > 0); |
| Q_ASSERT(highFreq > lowFreq); |
| m_bars.resize(numBars); |
| m_lowFreq = lowFreq; |
| m_highFreq = highFreq; |
| updateBars(); |
| } |
| |
| void Spectrograph::timerEvent(QTimerEvent *event) |
| { |
| Q_ASSERT(event->timerId() == m_timerId); |
| Q_UNUSED(event) // suppress warnings in release builds |
| killTimer(m_timerId); |
| m_timerId = NullTimerId; |
| m_barSelected = NullIndex; |
| update(); |
| } |
| |
| void Spectrograph::paintEvent(QPaintEvent *event) |
| { |
| Q_UNUSED(event) |
| |
| QPainter painter(this); |
| painter.fillRect(rect(), Qt::black); |
| |
| const int numBars = m_bars.count(); |
| |
| // Highlight region of selected bar |
| if (m_barSelected != NullIndex && numBars) { |
| QRect regionRect = rect(); |
| regionRect.setLeft(m_barSelected * rect().width() / numBars); |
| regionRect.setWidth(rect().width() / numBars); |
| QColor regionColor(202, 202, 64); |
| painter.setBrush(Qt::DiagCrossPattern); |
| painter.fillRect(regionRect, regionColor); |
| painter.setBrush(Qt::NoBrush); |
| } |
| |
| QColor barColor(51, 204, 102); |
| QColor clipColor(255, 255, 0); |
| |
| // Draw the outline |
| const QColor gridColor = barColor.darker(); |
| QPen gridPen(gridColor); |
| painter.setPen(gridPen); |
| painter.drawLine(rect().topLeft(), rect().topRight()); |
| painter.drawLine(rect().topRight(), rect().bottomRight()); |
| painter.drawLine(rect().bottomRight(), rect().bottomLeft()); |
| painter.drawLine(rect().bottomLeft(), rect().topLeft()); |
| |
| QVector<qreal> dashes; |
| dashes << 2 << 2; |
| gridPen.setDashPattern(dashes); |
| painter.setPen(gridPen); |
| |
| // Draw vertical lines between bars |
| if (numBars) { |
| const int numHorizontalSections = numBars; |
| QLine line(rect().topLeft(), rect().bottomLeft()); |
| for (int i=1; i<numHorizontalSections; ++i) { |
| line.translate(rect().width()/numHorizontalSections, 0); |
| painter.drawLine(line); |
| } |
| } |
| |
| // Draw horizontal lines |
| const int numVerticalSections = 10; |
| QLine line(rect().topLeft(), rect().topRight()); |
| for (int i=1; i<numVerticalSections; ++i) { |
| line.translate(0, rect().height()/numVerticalSections); |
| painter.drawLine(line); |
| } |
| |
| barColor = barColor.lighter(); |
| barColor.setAlphaF(0.75); |
| clipColor.setAlphaF(0.75); |
| |
| // Draw the bars |
| if (numBars) { |
| // Calculate width of bars and gaps |
| const int widgetWidth = rect().width(); |
| const int barPlusGapWidth = widgetWidth / numBars; |
| const int barWidth = 0.8 * barPlusGapWidth; |
| const int gapWidth = barPlusGapWidth - barWidth; |
| const int paddingWidth = widgetWidth - numBars * (barWidth + gapWidth); |
| const int leftPaddingWidth = (paddingWidth + gapWidth) / 2; |
| const int barHeight = rect().height() - 2 * gapWidth; |
| |
| for (int i=0; i<numBars; ++i) { |
| const qreal value = m_bars[i].value; |
| Q_ASSERT(value >= 0.0 && value <= 1.0); |
| QRect bar = rect(); |
| bar.setLeft(rect().left() + leftPaddingWidth + (i * (gapWidth + barWidth))); |
| bar.setWidth(barWidth); |
| bar.setTop(rect().top() + gapWidth + (1.0 - value) * barHeight); |
| bar.setBottom(rect().bottom() - gapWidth); |
| |
| QColor color = barColor; |
| if (m_bars[i].clipped) |
| color = clipColor; |
| |
| painter.fillRect(bar, color); |
| } |
| } |
| } |
| |
| void Spectrograph::mousePressEvent(QMouseEvent *event) |
| { |
| const QPoint pos = event->pos(); |
| const int index = m_bars.count() * (pos.x() - rect().left()) / rect().width(); |
| selectBar(index); |
| } |
| |
| void Spectrograph::reset() |
| { |
| m_spectrum.reset(); |
| spectrumChanged(m_spectrum); |
| } |
| |
| void Spectrograph::spectrumChanged(const FrequencySpectrum &spectrum) |
| { |
| m_spectrum = spectrum; |
| updateBars(); |
| } |
| |
| int Spectrograph::barIndex(qreal frequency) const |
| { |
| Q_ASSERT(frequency >= m_lowFreq && frequency < m_highFreq); |
| const qreal bandWidth = (m_highFreq - m_lowFreq) / m_bars.count(); |
| const int index = (frequency - m_lowFreq) / bandWidth; |
| if (index <0 || index >= m_bars.count()) |
| Q_ASSERT(false); |
| return index; |
| } |
| |
| QPair<qreal, qreal> Spectrograph::barRange(int index) const |
| { |
| Q_ASSERT(index >= 0 && index < m_bars.count()); |
| const qreal bandWidth = (m_highFreq - m_lowFreq) / m_bars.count(); |
| return QPair<qreal, qreal>(index * bandWidth, (index+1) * bandWidth); |
| } |
| |
| void Spectrograph::updateBars() |
| { |
| m_bars.fill(Bar()); |
| FrequencySpectrum::const_iterator i = m_spectrum.begin(); |
| const FrequencySpectrum::const_iterator end = m_spectrum.end(); |
| for ( ; i != end; ++i) { |
| const FrequencySpectrum::Element e = *i; |
| if (e.frequency >= m_lowFreq && e.frequency < m_highFreq) { |
| Bar &bar = m_bars[barIndex(e.frequency)]; |
| bar.value = qMax(bar.value, e.amplitude); |
| bar.clipped |= e.clipped; |
| } |
| } |
| update(); |
| } |
| |
| void Spectrograph::selectBar(int index) { |
| const QPair<qreal, qreal> frequencyRange = barRange(index); |
| const QString message = QString("%1 - %2 Hz") |
| .arg(frequencyRange.first) |
| .arg(frequencyRange.second); |
| emit infoMessage(message, BarSelectionInterval); |
| |
| if (NullTimerId != m_timerId) |
| killTimer(m_timerId); |
| m_timerId = startTimer(BarSelectionInterval); |
| |
| m_barSelected = index; |
| update(); |
| } |
| |
| |