638 lines
53 KiB
HTML
638 lines
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HTML
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<h1 class="title">waveform.cpp Example File</h1>
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<span class="small-subtitle">demos/spectrum/app/waveform.cpp</span>
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<!-- $$$demos/spectrum/app/waveform.cpp-description -->
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<div class="descr"> <a name="details"></a>
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<pre class="cpp"> <span class="comment">/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/</span>
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<span class="preprocessor">#include "waveform.h"</span>
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<span class="preprocessor">#include "utils.h"</span>
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<span class="preprocessor">#include <QPainter></span>
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<span class="preprocessor">#include <QResizeEvent></span>
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<span class="preprocessor">#include <QDebug></span>
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<span class="comment">//#define PAINT_EVENT_TRACE</span>
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<span class="preprocessor">#ifdef PAINT_EVENT_TRACE</span>
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<span class="preprocessor"># define WAVEFORM_PAINT_DEBUG qDebug()</span>
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<span class="preprocessor">#else</span>
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<span class="preprocessor"># define WAVEFORM_PAINT_DEBUG nullDebug()</span>
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<span class="preprocessor">#endif</span>
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Waveform<span class="operator">::</span>Waveform(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
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: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
|
|
<span class="operator">,</span> m_bufferPosition(<span class="number">0</span>)
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|
<span class="operator">,</span> m_bufferLength(<span class="number">0</span>)
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<span class="operator">,</span> m_audioPosition(<span class="number">0</span>)
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<span class="operator">,</span> m_active(<span class="keyword">false</span>)
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<span class="operator">,</span> m_tileLength(<span class="number">0</span>)
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|
<span class="operator">,</span> m_tileArrayStart(<span class="number">0</span>)
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|
<span class="operator">,</span> m_windowPosition(<span class="number">0</span>)
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<span class="operator">,</span> m_windowLength(<span class="number">0</span>)
|
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{
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|
setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Preferred<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Fixed);
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setMinimumHeight(<span class="number">50</span>);
|
|
}
|
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|
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Waveform<span class="operator">::</span><span class="operator">~</span>Waveform()
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{
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deletePixmaps();
|
|
}
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<span class="type">void</span> Waveform<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span> <span class="comment">/*event*/</span>)
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{
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<span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>);
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painter<span class="operator">.</span>fillRect(rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
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<span class="keyword">if</span> (m_active) {
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WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span>
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<span class="operator"><</span><span class="operator"><</span> <span class="string">"windowPosition"</span> <span class="operator"><</span><span class="operator"><</span> m_windowPosition
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<span class="operator"><</span><span class="operator"><</span> <span class="string">"windowLength"</span> <span class="operator"><</span><span class="operator"><</span> m_windowLength;
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<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> pos <span class="operator">=</span> m_windowPosition;
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<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> windowEnd <span class="operator">=</span> m_windowPosition <span class="operator">+</span> m_windowLength;
|
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<span class="type">int</span> destLeft <span class="operator">=</span> <span class="number">0</span>;
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<span class="type">int</span> destRight <span class="operator">=</span> <span class="number">0</span>;
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<span class="keyword">while</span> (pos <span class="operator"><</span> windowEnd) {
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<span class="keyword">const</span> TilePoint point <span class="operator">=</span> tilePoint(pos);
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WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"pos"</span> <span class="operator"><</span><span class="operator"><</span> pos
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<span class="operator"><</span><span class="operator"><</span> <span class="string">"tileIndex"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>index
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|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"positionOffset"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>positionOffset
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<span class="operator"><</span><span class="operator"><</span> <span class="string">"pixelOffset"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>pixelOffset;
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<span class="keyword">if</span> (point<span class="operator">.</span>index <span class="operator">!</span><span class="operator">=</span> NullIndex) {
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<span class="keyword">const</span> Tile <span class="operator">&</span>tile <span class="operator">=</span> m_tiles<span class="operator">[</span>point<span class="operator">.</span>index<span class="operator">]</span>;
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|
<span class="keyword">if</span> (tile<span class="operator">.</span>painted) {
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> sectionLength <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>((m_tileLength <span class="operator">-</span> point<span class="operator">.</span>positionOffset)<span class="operator">,</span>
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|
(windowEnd <span class="operator">-</span> pos));
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|
Q_ASSERT(sectionLength <span class="operator">></span> <span class="number">0</span>);
|
|
|
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<span class="keyword">const</span> <span class="type">int</span> sourceRight <span class="operator">=</span> tilePixelOffset(point<span class="operator">.</span>positionOffset <span class="operator">+</span> sectionLength);
|
|
destRight <span class="operator">=</span> windowPixelOffset(pos <span class="operator">-</span> m_windowPosition <span class="operator">+</span> sectionLength);
|
|
|
|
<span class="type"><a href="qrect.html">QRect</a></span> destRect <span class="operator">=</span> rect();
|
|
destRect<span class="operator">.</span>setLeft(destLeft);
|
|
destRect<span class="operator">.</span>setRight(destRight);
|
|
|
|
<span class="type"><a href="qrect.html">QRect</a></span> sourceRect(<span class="type"><a href="qpoint.html">QPoint</a></span>()<span class="operator">,</span> m_pixmapSize);
|
|
sourceRect<span class="operator">.</span>setLeft(point<span class="operator">.</span>pixelOffset);
|
|
sourceRect<span class="operator">.</span>setRight(sourceRight);
|
|
|
|
WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"tileIndex"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>index
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"source"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>pixelOffset <span class="operator"><</span><span class="operator"><</span> sourceRight
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"dest"</span> <span class="operator"><</span><span class="operator"><</span> destLeft <span class="operator"><</span><span class="operator"><</span> destRight;
|
|
|
|
painter<span class="operator">.</span>drawPixmap(destRect<span class="operator">,</span> <span class="operator">*</span>tile<span class="operator">.</span>pixmap<span class="operator">,</span> sourceRect);
|
|
|
|
destLeft <span class="operator">=</span> destRight;
|
|
|
|
<span class="keyword">if</span> (point<span class="operator">.</span>index <span class="operator"><</span> m_tiles<span class="operator">.</span>count()) {
|
|
pos <span class="operator">=</span> tilePosition(point<span class="operator">.</span>index <span class="operator">+</span> <span class="number">1</span>);
|
|
WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"pos ->"</span> <span class="operator"><</span><span class="operator"><</span> pos;
|
|
} <span class="keyword">else</span> {
|
|
<span class="comment">// Reached end of tile array</span>
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|
WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"reached end of tile array"</span>;
|
|
<span class="keyword">break</span>;
|
|
}
|
|
} <span class="keyword">else</span> {
|
|
<span class="comment">// Passed last tile which is painted</span>
|
|
WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"tile"</span> <span class="operator"><</span><span class="operator"><</span> point<span class="operator">.</span>index <span class="operator"><</span><span class="operator"><</span> <span class="string">"not painted"</span>;
|
|
<span class="keyword">break</span>;
|
|
}
|
|
} <span class="keyword">else</span> {
|
|
<span class="comment">// pos is past end of tile array</span>
|
|
WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"pos"</span> <span class="operator"><</span><span class="operator"><</span> pos <span class="operator"><</span><span class="operator"><</span> <span class="string">"past end of tile array"</span>;
|
|
<span class="keyword">break</span>;
|
|
}
|
|
}
|
|
|
|
WAVEFORM_PAINT_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintEvent"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"final pos"</span> <span class="operator"><</span><span class="operator"><</span> pos <span class="operator"><</span><span class="operator"><</span> <span class="string">"final x"</span> <span class="operator"><</span><span class="operator"><</span> destRight;
|
|
}
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>event)
|
|
{
|
|
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>size() <span class="operator">!</span><span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>oldSize())
|
|
createPixmaps(event<span class="operator">-</span><span class="operator">></span>size());
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>initialize(<span class="keyword">const</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span> <span class="operator">&</span>format<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> audioBufferSize<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> windowDurationUs)
|
|
{
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::initialize"</span>
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"audioBufferSize"</span> <span class="operator"><</span><span class="operator"><</span> audioBufferSize
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"windowDurationUs"</span> <span class="operator"><</span><span class="operator"><</span> windowDurationUs;
|
|
|
|
reset();
|
|
|
|
m_format <span class="operator">=</span> format;
|
|
|
|
<span class="comment">// Calculate tile size</span>
|
|
m_tileLength <span class="operator">=</span> audioBufferSize;
|
|
|
|
<span class="comment">// Calculate window size</span>
|
|
m_windowLength <span class="operator">=</span> audioLength(m_format<span class="operator">,</span> windowDurationUs);
|
|
|
|
<span class="comment">// Calculate number of tiles required</span>
|
|
<span class="type">int</span> nTiles;
|
|
<span class="keyword">if</span> (m_tileLength <span class="operator">></span> m_windowLength) {
|
|
nTiles <span class="operator">=</span> <span class="number">2</span>;
|
|
} <span class="keyword">else</span> {
|
|
nTiles <span class="operator">=</span> m_windowLength <span class="operator">/</span> m_tileLength <span class="operator">+</span> <span class="number">1</span>;
|
|
<span class="keyword">if</span> (m_windowLength <span class="operator">%</span> m_tileLength)
|
|
<span class="operator">+</span><span class="operator">+</span>nTiles;
|
|
}
|
|
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::initialize"</span>
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"tileLength"</span> <span class="operator"><</span><span class="operator"><</span> m_tileLength
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"windowLength"</span> <span class="operator"><</span><span class="operator"><</span> m_windowLength
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"nTiles"</span> <span class="operator"><</span><span class="operator"><</span> nTiles;
|
|
|
|
m_pixmaps<span class="operator">.</span>fill(<span class="number">0</span><span class="operator">,</span> nTiles);
|
|
m_tiles<span class="operator">.</span>resize(nTiles);
|
|
|
|
createPixmaps(rect()<span class="operator">.</span>size());
|
|
|
|
m_active <span class="operator">=</span> <span class="keyword">true</span>;
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span><a href="qtextstream.html#reset">reset</a>()
|
|
{
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::reset"</span>;
|
|
|
|
m_bufferPosition <span class="operator">=</span> <span class="number">0</span>;
|
|
m_buffer <span class="operator">=</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span>();
|
|
m_audioPosition <span class="operator">=</span> <span class="number">0</span>;
|
|
m_format <span class="operator">=</span> <span class="type"><a href="qaudioformat.html">QAudioFormat</a></span>();
|
|
m_active <span class="operator">=</span> <span class="keyword">false</span>;
|
|
deletePixmaps();
|
|
m_tiles<span class="operator">.</span>clear();
|
|
m_tileLength <span class="operator">=</span> <span class="number">0</span>;
|
|
m_tileArrayStart <span class="operator">=</span> <span class="number">0</span>;
|
|
m_windowPosition <span class="operator">=</span> <span class="number">0</span>;
|
|
m_windowLength <span class="operator">=</span> <span class="number">0</span>;
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>bufferChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> length<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span> <span class="operator">&</span>buffer)
|
|
{
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::bufferChanged"</span>
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"audioPosition"</span> <span class="operator"><</span><span class="operator"><</span> m_audioPosition
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferPosition"</span> <span class="operator"><</span><span class="operator"><</span> position
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferLength"</span> <span class="operator"><</span><span class="operator"><</span> length;
|
|
m_bufferPosition <span class="operator">=</span> position;
|
|
m_bufferLength <span class="operator">=</span> length;
|
|
m_buffer <span class="operator">=</span> buffer;
|
|
paintTiles();
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>audioPositionChanged(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position)
|
|
{
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::audioPositionChanged"</span>
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"audioPosition"</span> <span class="operator"><</span><span class="operator"><</span> position
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferPosition"</span> <span class="operator"><</span><span class="operator"><</span> m_bufferPosition
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferLength"</span> <span class="operator"><</span><span class="operator"><</span> m_bufferLength;
|
|
|
|
<span class="keyword">if</span> (position <span class="operator">></span><span class="operator">=</span> m_bufferPosition) {
|
|
<span class="keyword">if</span> (position <span class="operator">+</span> m_windowLength <span class="operator">></span> m_bufferPosition <span class="operator">+</span> m_bufferLength)
|
|
position <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span>(<span class="number">0</span>)<span class="operator">,</span> m_bufferPosition <span class="operator">+</span> m_bufferLength <span class="operator">-</span> m_windowLength);
|
|
m_audioPosition <span class="operator">=</span> position;
|
|
setWindowPosition(position);
|
|
}
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>deletePixmaps()
|
|
{
|
|
<span class="type"><a href="qpixmap.html">QPixmap</a></span> <span class="operator">*</span>pixmap;
|
|
foreach (pixmap<span class="operator">,</span> m_pixmaps)
|
|
<span class="keyword">delete</span> pixmap;
|
|
m_pixmaps<span class="operator">.</span>clear();
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>createPixmaps(<span class="keyword">const</span> <span class="type"><a href="qsize.html">QSize</a></span> <span class="operator">&</span>widgetSize)
|
|
{
|
|
m_pixmapSize <span class="operator">=</span> widgetSize;
|
|
m_pixmapSize<span class="operator">.</span>setWidth(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(widgetSize<span class="operator">.</span>width()) <span class="operator">*</span> m_tileLength <span class="operator">/</span> m_windowLength);
|
|
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::createPixmaps"</span>
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"widgetSize"</span> <span class="operator"><</span><span class="operator"><</span> widgetSize
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"pixmapSize"</span> <span class="operator"><</span><span class="operator"><</span> m_pixmapSize;
|
|
|
|
Q_ASSERT(m_tiles<span class="operator">.</span>count() <span class="operator">=</span><span class="operator">=</span> m_pixmaps<span class="operator">.</span>count());
|
|
|
|
<span class="comment">// (Re)create pixmaps</span>
|
|
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>m_pixmaps<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
|
|
<span class="keyword">delete</span> m_pixmaps<span class="operator">[</span>i<span class="operator">]</span>;
|
|
m_pixmaps<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="number">0</span>;
|
|
m_pixmaps<span class="operator">[</span>i<span class="operator">]</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpixmap.html">QPixmap</a></span>(m_pixmapSize);
|
|
}
|
|
|
|
<span class="comment">// Update tile pixmap pointers, and mark for repainting</span>
|
|
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>m_tiles<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) {
|
|
m_tiles<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>pixmap <span class="operator">=</span> m_pixmaps<span class="operator">[</span>i<span class="operator">]</span>;
|
|
m_tiles<span class="operator">[</span>i<span class="operator">]</span><span class="operator">.</span>painted <span class="operator">=</span> <span class="keyword">false</span>;
|
|
}
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>setWindowPosition(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position)
|
|
{
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::setWindowPosition"</span>
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"old"</span> <span class="operator"><</span><span class="operator"><</span> m_windowPosition <span class="operator"><</span><span class="operator"><</span> <span class="string">"new"</span> <span class="operator"><</span><span class="operator"><</span> position
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"tileArrayStart"</span> <span class="operator"><</span><span class="operator"><</span> m_tileArrayStart;
|
|
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> oldPosition <span class="operator">=</span> m_windowPosition;
|
|
m_windowPosition <span class="operator">=</span> position;
|
|
|
|
<span class="keyword">if</span>((m_windowPosition <span class="operator">></span><span class="operator">=</span> oldPosition) <span class="operator">&</span><span class="operator">&</span>
|
|
(m_windowPosition <span class="operator">-</span> m_tileArrayStart <span class="operator"><</span> (m_tiles<span class="operator">.</span>count() <span class="operator">*</span> m_tileLength))) {
|
|
<span class="comment">// Work out how many tiles need to be shuffled</span>
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> offset <span class="operator">=</span> m_windowPosition <span class="operator">-</span> m_tileArrayStart;
|
|
<span class="keyword">const</span> <span class="type">int</span> nTiles <span class="operator">=</span> offset <span class="operator">/</span> m_tileLength;
|
|
shuffleTiles(nTiles);
|
|
} <span class="keyword">else</span> {
|
|
resetTiles(m_windowPosition);
|
|
}
|
|
|
|
<span class="keyword">if</span>(<span class="operator">!</span>paintTiles() <span class="operator">&</span><span class="operator">&</span> m_windowPosition <span class="operator">!</span><span class="operator">=</span> oldPosition)
|
|
update();
|
|
}
|
|
|
|
<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> Waveform<span class="operator">::</span>tilePosition(<span class="type">int</span> index) <span class="keyword">const</span>
|
|
{
|
|
<span class="keyword">return</span> m_tileArrayStart <span class="operator">+</span> index <span class="operator">*</span> m_tileLength;
|
|
}
|
|
|
|
Waveform<span class="operator">::</span>TilePoint Waveform<span class="operator">::</span>tilePoint(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> position) <span class="keyword">const</span>
|
|
{
|
|
TilePoint result;
|
|
<span class="keyword">if</span> (position <span class="operator">></span><span class="operator">=</span> m_tileArrayStart) {
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> tileArrayEnd <span class="operator">=</span> m_tileArrayStart <span class="operator">+</span> m_tiles<span class="operator">.</span>count() <span class="operator">*</span> m_tileLength;
|
|
<span class="keyword">if</span> (position <span class="operator"><</span> tileArrayEnd) {
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> offsetIntoTileArray <span class="operator">=</span> position <span class="operator">-</span> m_tileArrayStart;
|
|
result<span class="operator">.</span>index <span class="operator">=</span> offsetIntoTileArray <span class="operator">/</span> m_tileLength;
|
|
Q_ASSERT(result<span class="operator">.</span>index <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> result<span class="operator">.</span>index <span class="operator"><</span><span class="operator">=</span> m_tiles<span class="operator">.</span>count());
|
|
result<span class="operator">.</span>positionOffset <span class="operator">=</span> offsetIntoTileArray <span class="operator">%</span> m_tileLength;
|
|
result<span class="operator">.</span>pixelOffset <span class="operator">=</span> tilePixelOffset(result<span class="operator">.</span>positionOffset);
|
|
Q_ASSERT(result<span class="operator">.</span>pixelOffset <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> result<span class="operator">.</span>pixelOffset <span class="operator"><</span><span class="operator">=</span> m_pixmapSize<span class="operator">.</span>width());
|
|
}
|
|
}
|
|
|
|
<span class="keyword">return</span> result;
|
|
}
|
|
|
|
<span class="type">int</span> Waveform<span class="operator">::</span>tilePixelOffset(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> positionOffset) <span class="keyword">const</span>
|
|
{
|
|
Q_ASSERT(positionOffset <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> positionOffset <span class="operator"><</span><span class="operator">=</span> m_tileLength);
|
|
<span class="keyword">const</span> <span class="type">int</span> result <span class="operator">=</span> (<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(positionOffset) <span class="operator">/</span> m_tileLength) <span class="operator">*</span> m_pixmapSize<span class="operator">.</span>width();
|
|
<span class="keyword">return</span> result;
|
|
}
|
|
|
|
<span class="type">int</span> Waveform<span class="operator">::</span>windowPixelOffset(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> positionOffset) <span class="keyword">const</span>
|
|
{
|
|
Q_ASSERT(positionOffset <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> positionOffset <span class="operator"><</span><span class="operator">=</span> m_windowLength);
|
|
<span class="keyword">const</span> <span class="type">int</span> result <span class="operator">=</span> (<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(positionOffset) <span class="operator">/</span> m_windowLength) <span class="operator">*</span> rect()<span class="operator">.</span>width();
|
|
<span class="keyword">return</span> result;
|
|
}
|
|
|
|
<span class="type">bool</span> Waveform<span class="operator">::</span>paintTiles()
|
|
{
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintTiles"</span>;
|
|
<span class="type">bool</span> updateRequired <span class="operator">=</span> <span class="keyword">false</span>;
|
|
|
|
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>m_tiles<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) {
|
|
<span class="keyword">const</span> Tile <span class="operator">&</span>tile <span class="operator">=</span> m_tiles<span class="operator">[</span>i<span class="operator">]</span>;
|
|
<span class="keyword">if</span> (<span class="operator">!</span>tile<span class="operator">.</span>painted) {
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> tileStart <span class="operator">=</span> m_tileArrayStart <span class="operator">+</span> i <span class="operator">*</span> m_tileLength;
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> tileEnd <span class="operator">=</span> tileStart <span class="operator">+</span> m_tileLength;
|
|
<span class="keyword">if</span> (m_bufferPosition <span class="operator"><</span><span class="operator">=</span> tileStart <span class="operator">&</span><span class="operator">&</span> m_bufferPosition <span class="operator">+</span> m_bufferLength <span class="operator">></span><span class="operator">=</span> tileEnd) {
|
|
paintTile(i);
|
|
updateRequired <span class="operator">=</span> <span class="keyword">true</span>;
|
|
}
|
|
}
|
|
}
|
|
|
|
<span class="keyword">if</span> (updateRequired)
|
|
update();
|
|
|
|
<span class="keyword">return</span> updateRequired;
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>paintTile(<span class="type">int</span> index)
|
|
{
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> tileStart <span class="operator">=</span> m_tileArrayStart <span class="operator">+</span> index <span class="operator">*</span> m_tileLength;
|
|
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::paintTile"</span>
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"index"</span> <span class="operator"><</span><span class="operator"><</span> index
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferPosition"</span> <span class="operator"><</span><span class="operator"><</span> m_bufferPosition
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"bufferLength"</span> <span class="operator"><</span><span class="operator"><</span> m_bufferLength
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"start"</span> <span class="operator"><</span><span class="operator"><</span> tileStart
|
|
<span class="operator"><</span><span class="operator"><</span> <span class="string">"end"</span> <span class="operator"><</span><span class="operator"><</span> tileStart <span class="operator">+</span> m_tileLength;
|
|
|
|
Q_ASSERT(m_bufferPosition <span class="operator"><</span><span class="operator">=</span> tileStart);
|
|
Q_ASSERT(m_bufferPosition <span class="operator">+</span> m_bufferLength <span class="operator">></span><span class="operator">=</span> tileStart <span class="operator">+</span> m_tileLength);
|
|
|
|
Tile <span class="operator">&</span>tile <span class="operator">=</span> m_tiles<span class="operator">[</span>index<span class="operator">]</span>;
|
|
Q_ASSERT(<span class="operator">!</span>tile<span class="operator">.</span>painted);
|
|
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">*</span> base <span class="operator">=</span> <span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">*</span><span class="operator">></span>(m_buffer<span class="operator">.</span>constData());
|
|
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">*</span> buffer <span class="operator">=</span> base <span class="operator">+</span> ((tileStart <span class="operator">-</span> m_bufferPosition) <span class="operator">/</span> <span class="number">2</span>);
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<span class="keyword">const</span> <span class="type">int</span> numSamples <span class="operator">=</span> m_tileLength <span class="operator">/</span> (<span class="number">2</span> <span class="operator">*</span> m_format<span class="operator">.</span>channels());
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<span class="type"><a href="qpainter.html">QPainter</a></span> painter(tile<span class="operator">.</span>pixmap);
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painter<span class="operator">.</span>fillRect(tile<span class="operator">.</span>pixmap<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
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<span class="type"><a href="qpen.html">QPen</a></span> pen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
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painter<span class="operator">.</span>setPen(pen);
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<span class="comment">// Calculate initial PCM value</span>
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<span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span> previousPcmValue <span class="operator">=</span> <span class="number">0</span>;
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<span class="keyword">if</span> (buffer <span class="operator">></span> base)
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previousPcmValue <span class="operator">=</span> <span class="operator">*</span>(buffer <span class="operator">-</span> m_format<span class="operator">.</span>channels());
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<span class="comment">// Calculate initial point</span>
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<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> previousRealValue <span class="operator">=</span> pcmToReal(previousPcmValue);
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<span class="keyword">const</span> <span class="type">int</span> originY <span class="operator">=</span> ((previousRealValue <span class="operator">+</span> <span class="number">1.0</span>) <span class="operator">/</span> <span class="number">2</span>) <span class="operator">*</span> m_pixmapSize<span class="operator">.</span>height();
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<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> origin(<span class="number">0</span><span class="operator">,</span> originY);
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<span class="type"><a href="qline.html">QLine</a></span> line(origin<span class="operator">,</span> origin);
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<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>numSamples; <span class="operator">+</span><span class="operator">+</span>i) {
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<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span><span class="operator">*</span> ptr <span class="operator">=</span> buffer <span class="operator">+</span> i <span class="operator">*</span> m_format<span class="operator">.</span>channels();
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<span class="keyword">const</span> <span class="type">int</span> offset <span class="operator">=</span> <span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="keyword">const</span> <span class="type">char</span><span class="operator">*</span><span class="operator">></span>(ptr) <span class="operator">-</span> m_buffer<span class="operator">.</span>constData();
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Q_ASSERT(offset <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>);
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Q_ASSERT(offset <span class="operator"><</span> m_bufferLength);
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<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qint16-typedef">qint16</a></span> pcmValue <span class="operator">=</span> <span class="operator">*</span>ptr;
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<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> realValue <span class="operator">=</span> pcmToReal(pcmValue);
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<span class="keyword">const</span> <span class="type">int</span> x <span class="operator">=</span> tilePixelOffset(i <span class="operator">*</span> <span class="number">2</span> <span class="operator">*</span> m_format<span class="operator">.</span>channels());
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<span class="keyword">const</span> <span class="type">int</span> y <span class="operator">=</span> ((realValue <span class="operator">+</span> <span class="number">1.0</span>) <span class="operator">/</span> <span class="number">2</span>) <span class="operator">*</span> m_pixmapSize<span class="operator">.</span>height();
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line<span class="operator">.</span>setP2(<span class="type"><a href="qpoint.html">QPoint</a></span>(x<span class="operator">,</span> y));
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painter<span class="operator">.</span>drawLine(line);
|
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line<span class="operator">.</span>setP1(line<span class="operator">.</span>p2());
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|
}
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|
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tile<span class="operator">.</span>painted <span class="operator">=</span> <span class="keyword">true</span>;
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>shuffleTiles(<span class="type">int</span> n)
|
|
{
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::shuffleTiles"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"n"</span> <span class="operator"><</span><span class="operator"><</span> n;
|
|
|
|
<span class="keyword">while</span> (n<span class="operator">-</span><span class="operator">-</span>) {
|
|
Tile tile <span class="operator">=</span> m_tiles<span class="operator">.</span>first();
|
|
tile<span class="operator">.</span>painted <span class="operator">=</span> <span class="keyword">false</span>;
|
|
m_tiles<span class="operator">.</span>erase(m_tiles<span class="operator">.</span>begin());
|
|
m_tiles <span class="operator">+</span><span class="operator">=</span> tile;
|
|
m_tileArrayStart <span class="operator">+</span><span class="operator">=</span> m_tileLength;
|
|
}
|
|
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::shuffleTiles"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"tileArrayStart"</span> <span class="operator"><</span><span class="operator"><</span> m_tileArrayStart;
|
|
}
|
|
|
|
<span class="type">void</span> Waveform<span class="operator">::</span>resetTiles(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> newStartPos)
|
|
{
|
|
WAVEFORM_DEBUG <span class="operator"><</span><span class="operator"><</span> <span class="string">"Waveform::resetTiles"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"newStartPos"</span> <span class="operator"><</span><span class="operator"><</span> newStartPos;
|
|
|
|
<span class="type"><a href="qvector.html">QVector</a></span><span class="operator"><</span>Tile<span class="operator">></span><span class="operator">::</span>iterator i <span class="operator">=</span> m_tiles<span class="operator">.</span>begin();
|
|
<span class="keyword">for</span> ( ; i <span class="operator">!</span><span class="operator">=</span> m_tiles<span class="operator">.</span>end(); <span class="operator">+</span><span class="operator">+</span>i)
|
|
i<span class="operator">-</span><span class="operator">></span>painted <span class="operator">=</span> <span class="keyword">false</span>;
|
|
|
|
m_tileArrayStart <span class="operator">=</span> newStartPos;
|
|
}</pre>
|
|
</div>
|
|
<!-- @@@demos/spectrum/app/waveform.cpp -->
|
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</div>
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</div>
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</div>
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<div class="ft">
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<span></span>
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<p>
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<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
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Documentation contributions included herein are the copyrights of
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their respective owners.</p>
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<br />
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<p>
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The documentation provided herein is licensed under the terms of the
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<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
|
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License version 1.3</a> as published by the Free Software Foundation.</p>
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<p>
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Documentation sources may be obtained from <a href="http://www.qt-project.org">
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www.qt-project.org</a>.</p>
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<br />
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<p>
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Qt and respective logos are trademarks of The Qt Company Ltd
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in Finland and/or other countries worldwide. All other trademarks are property
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of their respective owners. <a title="Privacy Policy"
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href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
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