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Diffstat (limited to 'testapp/plotwidget.cpp')
| -rw-r--r-- | testapp/plotwidget.cpp | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/testapp/plotwidget.cpp b/testapp/plotwidget.cpp new file mode 100644 index 0000000..0564df2 --- /dev/null +++ b/testapp/plotwidget.cpp @@ -0,0 +1,161 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtGui> + +#include "plotwidget.h" +#include "qkineticscroller.h" + +PlotWidget::PlotWidget(QKineticScroller *scroller) + : QWidget(), m_scroller(scroller) +{ + setWindowTitle(QLatin1String("Plot")); + m_scroller->registerDebugHook(debugHook, this); + + m_clear = new QPushButton(QLatin1String("Clear"), this); + connect(m_clear, SIGNAL(clicked()), this, SLOT(reset())); + m_legend = new QLabel(this); + QString legend; + QTextStream ts(&legend); + ts << "<table border=\"0\">"; + ts << "<tr><td width=\"30\" bgcolor=\"" << QColor(Qt::red).light().name() << "\" /><td>releaseVelocity X</td></tr>"; + ts << "<tr><td width=\"30\" bgcolor=\"" << QColor(Qt::red).dark().name() << "\" /><td>releaseVelocity Y</td></tr>"; + ts << "<tr><td width=\"30\" bgcolor=\"" << QColor(Qt::green).light().name() << "\" /><td>Content Position X</td></tr>"; + ts << "<tr><td width=\"30\" bgcolor=\"" << QColor(Qt::green).dark().name() << "\" /><td>Content Position Y</td></tr>"; + ts << "<tr><td width=\"30\" bgcolor=\"" << QColor(Qt::blue).light().name() << "\" /><td>Overshoot Position X</td></tr>"; + ts << "<tr><td width=\"30\" bgcolor=\"" << QColor(Qt::blue).dark().name() << "\" /><td>Overshoot Position Y</td></tr>"; + ts << "</table>"; + m_legend->setText(legend); +} + +void PlotWidget::debugHook(void *user, const QPointF &releaseVelocity, const QPointF &contentPosition, const QPointF &overshootPosition) +{ + PlotItem pi = { releaseVelocity, contentPosition, overshootPosition }; + static_cast<PlotWidget *>(user)->addPlotItem(pi); +} + +static inline void doMaxMin(const QPointF &v, qreal &minmaxv) +{ + minmaxv = qMax(minmaxv, qMax(qAbs(v.x()), qAbs(v.y()))); +} + +void PlotWidget::addPlotItem(const PlotItem &pi) +{ + m_plotitems.append(pi); + minMaxVelocity = minMaxPosition = 0; + + while (m_plotitems.size() > 500) + m_plotitems.removeFirst(); + + foreach (const PlotItem &pi, m_plotitems) { + doMaxMin(pi.releaseVelocity, minMaxVelocity); + doMaxMin(pi.contentPosition, minMaxPosition); + doMaxMin(pi.overshootPosition, minMaxPosition); + } + update(); +} + +void PlotWidget::reset() +{ + m_plotitems.clear(); + minMaxVelocity = minMaxPosition = 0; + update(); +} + +void PlotWidget::resizeEvent(QResizeEvent *) +{ + QSize cs = m_clear->sizeHint(); + QSize ls = m_legend->sizeHint(); + m_clear->setGeometry(4, 4, cs.width(), cs.height()); + m_legend->setGeometry(4, height() - ls.height() - 4, ls.width(), ls.height()); +} + +void PlotWidget::paintEvent(QPaintEvent *) +{ +#define SCALE(v, mm) ((qreal(1) - (v / mm)) * qreal(0.5) * height()) + + QColor rvColor = Qt::red; + QColor cpColor = Qt::green; + QColor opColor = Qt::blue; + + + QPainter p(this); + p.setRenderHints(QPainter::Antialiasing); + p.fillRect(rect(), Qt::white); + + if (m_plotitems.isEmpty()) + return; + + int x = 2; + int offset = m_plotitems.size() - width() / 2; + QList<PlotItem>::const_iterator it = m_plotitems.constBegin(); + if (offset > 0) + it += (offset - 1); + + const PlotItem *last = &(*it++); + + while (it != m_plotitems.constEnd()) { + p.setPen(rvColor.light()); + p.drawLine(qreal(x - 2), SCALE(last->releaseVelocity.x(), minMaxVelocity), + qreal(x), SCALE(it->releaseVelocity.x(), minMaxVelocity)); + p.setPen(rvColor.dark()); + p.drawLine(qreal(x - 2), SCALE(last->releaseVelocity.y(), minMaxVelocity), + qreal(x), SCALE(it->releaseVelocity.y(), minMaxVelocity)); + + p.setPen(cpColor.light()); + p.drawLine(qreal(x - 2), SCALE(last->contentPosition.x(), minMaxPosition), + qreal(x), SCALE(it->contentPosition.x(), minMaxPosition)); + p.setPen(cpColor.dark()); + p.drawLine(qreal(x - 2), SCALE(last->contentPosition.y(), minMaxPosition), + qreal(x), SCALE(it->contentPosition.y(), minMaxPosition)); + + p.setPen(opColor.light()); + p.drawLine(qreal(x - 2), SCALE(last->overshootPosition.x(), minMaxPosition), + qreal(x), SCALE(it->overshootPosition.x(), minMaxPosition)); + p.setPen(opColor.dark()); + p.drawLine(qreal(x - 2), SCALE(last->overshootPosition.y(), minMaxPosition), + qreal(x), SCALE(it->overshootPosition.y(), minMaxPosition)); + + last = &(*it++); + x += 2; + } +#undef SCALE +} |