slapin/qtmultimedia
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

centralize and fixup example sources install targets

Browse Source 
This follows suit with aeb036e in qtbase.

Change-Id: Ie8580d0a1f38ab9858b0e44c9f99bdc552a1752a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: hjk <qthjk@ovi.com>
This commit is contained in:
Joerg Bornemann
2012-12-05 13:03:09 +01:00
committed by The Qt Project
parent 90c8ba233b
commit 6b4994c265
407 changed files with 216 additions and 271 deletions
Download Patch File Download Diff File Expand all files Collapse all files

241
examples/multimedia/spectrum/app/spectrograph.cpp Normal file
View File

@@ -0,0 +1,241 @@
/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia Plc 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 <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();
}