examples/multitouch/knobs/knob.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 19 Feb 2010 23:40:16 +0200
branchRCL_3
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Revision: 201003 Kit: 201007
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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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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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "knob.h"
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#include <QBrush>
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#include <QTouchEvent>
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Knob::Knob()
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    : QGraphicsEllipseItem(-50, -50, 100, 100)
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{
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    setAcceptTouchEvents(true);
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    setBrush(Qt::lightGray);
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    QGraphicsEllipseItem *leftItem = new QGraphicsEllipseItem(0, 0, 20, 20, this);
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    leftItem->setPos(-40, -10);
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    leftItem->setBrush(Qt::darkGreen);
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    QGraphicsEllipseItem *rightItem = new QGraphicsEllipseItem(0, 0, 20, 20, this);
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    rightItem->setPos(20, -10);
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    rightItem->setBrush(Qt::darkRed);
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}
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bool Knob::sceneEvent(QEvent *event)
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{
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    switch (event->type()) {
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    case QEvent::TouchBegin:
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    case QEvent::TouchUpdate:
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    case QEvent::TouchEnd:
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    {
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        QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
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        if (touchEvent->touchPoints().count() == 2) {
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            const QTouchEvent::TouchPoint &touchPoint1 = touchEvent->touchPoints().first();
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            const QTouchEvent::TouchPoint &touchPoint2 = touchEvent->touchPoints().last();
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            QLineF line1(touchPoint1.lastScenePos(), touchPoint2.lastScenePos());
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            QLineF line2(touchPoint1.scenePos(), touchPoint2.scenePos());
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            rotate(line2.angleTo(line1));
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        }
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        break;
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    }
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    default:
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        return QGraphicsItem::sceneEvent(event);
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    }
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    return true;
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}