2011-04-27 10:05:43 +00:00
|
|
|
/****************************************************************************
|
|
|
|
**
|
2016-01-22 12:24:00 +00:00
|
|
|
** Copyright (C) 2016 The Qt Company Ltd.
|
|
|
|
** Contact: https://www.qt.io/licensing/
|
2011-04-27 10:05:43 +00:00
|
|
|
**
|
|
|
|
** This file is part of the examples of the Qt Toolkit.
|
|
|
|
**
|
|
|
|
** $QT_BEGIN_LICENSE:BSD$
|
2016-01-22 12:24:00 +00:00
|
|
|
** Commercial License Usage
|
|
|
|
** Licensees holding valid commercial Qt licenses may use this file in
|
|
|
|
** accordance with the commercial license agreement provided with the
|
|
|
|
** Software or, alternatively, in accordance with the terms contained in
|
|
|
|
** a written agreement between you and The Qt Company. For licensing terms
|
|
|
|
** and conditions see https://www.qt.io/terms-conditions. For further
|
|
|
|
** information use the contact form at https://www.qt.io/contact-us.
|
|
|
|
**
|
|
|
|
** BSD License Usage
|
|
|
|
** Alternatively, you may use this file under the terms of the BSD license
|
|
|
|
** as follows:
|
2011-04-27 10:05:43 +00:00
|
|
|
**
|
|
|
|
** "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.
|
2015-02-13 11:15:33 +00:00
|
|
|
** * Neither the name of The Qt Company Ltd nor the names of its
|
|
|
|
** contributors may be used to endorse or promote products derived
|
|
|
|
** from this software without specific prior written permission.
|
2012-09-19 12:28:29 +00:00
|
|
|
**
|
2011-04-27 10:05:43 +00:00
|
|
|
**
|
|
|
|
** 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."
|
2012-01-24 06:17:24 +00:00
|
|
|
**
|
2011-04-27 10:05:43 +00:00
|
|
|
** $QT_END_LICENSE$
|
|
|
|
**
|
|
|
|
****************************************************************************/
|
|
|
|
|
|
|
|
#include "knob.h"
|
|
|
|
|
|
|
|
#include <QBrush>
|
|
|
|
#include <QTouchEvent>
|
|
|
|
|
|
|
|
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<QTouchEvent *>(event);
|
|
|
|
|
2021-04-16 09:29:12 +00:00
|
|
|
if (touchEvent->points().count() == 2) {
|
|
|
|
const QEventPoint &touchPoint1 = touchEvent->points().first();
|
|
|
|
const QEventPoint &touchPoint2 = touchEvent->points().last();
|
2011-04-27 10:05:43 +00:00
|
|
|
|
2021-04-16 09:29:12 +00:00
|
|
|
QLineF line1(touchPoint1.sceneLastPosition(), touchPoint2.sceneLastPosition());
|
2020-06-04 16:07:06 +00:00
|
|
|
QLineF line2(touchPoint1.scenePosition(), touchPoint2.scenePosition());
|
2011-04-27 10:05:43 +00:00
|
|
|
|
2012-06-25 17:44:44 +00:00
|
|
|
setTransform(QTransform().rotate(line2.angleTo(line1)), true);
|
2011-04-27 10:05:43 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
default:
|
|
|
|
return QGraphicsItem::sceneEvent(event);
|
|
|
|
}
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|