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-rw-r--r--examples/scroller/plot/plotwidget.cpp204
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diff --git a/examples/scroller/plot/plotwidget.cpp b/examples/scroller/plot/plotwidget.cpp
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--- a/examples/scroller/plot/plotwidget.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 <QPushButton>
-#include <QTextStream>
-#include <QColor>
-#include <QPainter>
-#include <QLabel>
-#include <QResizeEvent>
-#include <QPlastiqueStyle>
-#include <QAbstractScrollArea>
-
-#include "plotwidget.h"
-#include "qscroller.h"
-
-PlotWidget::PlotWidget(bool /*smallscreen*/)
- : QWidget(), m_widget(0)
-{
- setWindowTitle(QLatin1String("Plot"));
- m_clear = new QPushButton(QLatin1String("Clear"), this);
-#if defined(Q_WS_MAEMO_5)
- m_clear->setStyle(new QPlastiqueStyle());
- m_clear->setFixedHeight(55);
-#endif
- connect(m_clear, SIGNAL(clicked()), this, SLOT(reset()));
- m_legend = new QLabel(this);
- QString legend;
- QTextStream ts(&legend);
- // ok. this wouldn't pass the w3c html verification...
- ts << "<table style=\"color:#000;\" border=\"0\">";
- ts << "<tr><td width=\"30\" bgcolor=\"" << QColor(Qt::red).light().name() << "\" /><td>Velocity X</td></tr>";
- ts << "<tr><td width=\"30\" bgcolor=\"" << QColor(Qt::red).dark().name() << "\" /><td>Velocity 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::setScroller(QWidget *widget)
-{
- if (QAbstractScrollArea *area = qobject_cast<QAbstractScrollArea *>(widget))
- widget = area->viewport();
-
- if (m_widget)
- m_widget->removeEventFilter(this);
- m_widget = widget;
- reset();
- if (m_widget)
- m_widget->installEventFilter(this);
-}
-
-bool PlotWidget::eventFilter(QObject *obj, QEvent *ev)
-{
- if (ev->type() == QEvent::Scroll) {
- QScrollEvent *se = static_cast<QScrollEvent *>(ev);
- QScroller *scroller = QScroller::scroller(m_widget);
-
- QPointF v = scroller->velocity();
- //v.rx() *= scroller->pixelPerMeter().x();
- //v.ry() *= scroller->pixelPerMeter().y();
-
- PlotItem pi = { v, se->contentPos(), se->overshootDistance() };
- addPlotItem(pi);
- }
-
- return QWidget::eventFilter(obj, ev);
-}
-
-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.velocity, 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); //too slow for 60fps
- p.fillRect(rect(), Qt::white);
-
- p.setPen(Qt::black);
- p.drawLine(0, SCALE(0, 1), width(), SCALE(0, 1));
-
- 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->velocity.x(), minMaxVelocity),
- qreal(x), SCALE(it->velocity.x(), minMaxVelocity));
- p.setPen(rvColor.dark());
- p.drawLine(qreal(x - 2), SCALE(last->velocity.y(), minMaxVelocity),
- qreal(x), SCALE(it->velocity.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;
- }
-
- QString toptext = QString("%1 [m/s] / %2 [pix]").arg(minMaxVelocity, 0, 'f', 2).arg(minMaxPosition, 0, 'f', 2);
- QString bottomtext = QString("-%1 [m/s] / -%2 [pix]").arg(minMaxVelocity, 0, 'f', 2).arg(minMaxPosition, 0, 'f', 2);
-
- p.setPen(Qt::black);
- p.drawText(rect(), Qt::AlignTop | Qt::AlignHCenter, toptext);
- p.drawText(rect(), Qt::AlignBottom | Qt::AlignHCenter, bottomtext);
-#undef SCALE
-}
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