/**************************************************************************** ** ** 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 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 "knob.h" #include #include Knob::Knob() : QGraphicsEllipseItem(-50, -50, 100, 100) { setAcceptTouchEvents(true); setBrush(Qt::lightGray); QGraphicsEllipseItem *leftItem = new QGraphicsEllipseItem(0, 0, 20, 20, this); leftItem->setPos(-40, -10); leftItem->setBrush(Qt::darkGreen); QGraphicsEllipseItem *rightItem = new QGraphicsEllipseItem(0, 0, 20, 20, this); rightItem->setPos(20, -10); rightItem->setBrush(Qt::darkRed); } bool Knob::sceneEvent(QEvent *event) { switch (event->type()) { case QEvent::TouchBegin: case QEvent::TouchUpdate: case QEvent::TouchEnd: { QTouchEvent *touchEvent = static_cast(event); if (touchEvent->touchPoints().count() == 2) { const QTouchEvent::TouchPoint &touchPoint1 = touchEvent->touchPoints().first(); const QTouchEvent::TouchPoint &touchPoint2 = touchEvent->touchPoints().last(); QLineF line1(touchPoint1.lastScenePos(), touchPoint2.lastScenePos()); QLineF line2(touchPoint1.scenePos(), touchPoint2.scenePos()); rotate(line2.angleTo(line1)); } break; } default: return QGraphicsItem::sceneEvent(event); } return true; }