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-rw-r--r--examples/spectrum/app/spectrograph.cpp241
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diff --git a/examples/spectrum/app/spectrograph.cpp b/examples/spectrum/app/spectrograph.cpp
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--- a/examples/spectrum/app/spectrograph.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the examples of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** You may use this file under the terms of the BSD license as follows:
-**
-** "Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-** * Redistributions of source code must retain the above copyright
-** notice, this list of conditions and the following disclaimer.
-** * Redistributions in binary form must reproduce the above copyright
-** notice, this list of conditions and the following disclaimer in
-** the documentation and/or other materials provided with the
-** distribution.
-** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
-** the names of its contributors may be used to endorse or promote
-** products derived from this software without specific prior written
-** permission.
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "spectrograph.h"
-#include <QPainter>
-#include <QMouseEvent>
-#include <QDebug>
-#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();
-}
-
-
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