1 /****************************************************************************
3 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4 ** All rights reserved.
5 ** Contact: Nokia Corporation (qt-info@nokia.com)
7 ** This file is part of the Declarative module of the Qt Toolkit.
9 ** $QT_BEGIN_LICENSE:LGPL$
10 ** No Commercial Usage
11 ** This file contains pre-release code and may not be distributed.
12 ** You may use this file in accordance with the terms and conditions
13 ** contained in the Technology Preview License Agreement accompanying
16 ** GNU Lesser General Public License Usage
17 ** Alternatively, this file may be used under the terms of the GNU Lesser
18 ** General Public License version 2.1 as published by the Free Software
19 ** Foundation and appearing in the file LICENSE.LGPL included in the
20 ** packaging of this file. Please review the following information to
21 ** ensure the GNU Lesser General Public License version 2.1 requirements
22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
24 ** In addition, as a special exception, Nokia gives you certain additional
25 ** rights. These rights are described in the Nokia Qt LGPL Exception
26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
28 ** If you have questions regarding the use of this file, please contact
29 ** Nokia at qt-info@nokia.com.
40 ****************************************************************************/
42 #include "qsgtargetaffector_p.h"
45 QSGTargetAffector::QSGTargetAffector(QSGItem *parent) :
46 QSGParticleAffector(parent), m_targetX(0), m_targetY(0),
47 m_targetWidth(0), m_targetHeight(0), m_defaultShape(new QSGParticleExtruder(this)),
48 m_targetShape(m_defaultShape), m_targetTime(-1)
53 void QSGTargetAffector::reset(QSGParticleData* d)
55 QSGParticleAffector::reset(d);
56 m_targets[qMakePair<int,int>(d->group, d->index)] = m_targetShape->extrude(QRectF(m_targetX, m_targetY, m_targetWidth, m_targetHeight));
59 bool QSGTargetAffector::affectParticle(QSGParticleData *d, qreal dt)
62 QPointF target = m_targets[qMakePair<int,int>(d->group, d->index)];
65 qreal tt = m_targetTime==-1?d->lifeSpan:(m_targetTime / 1000.0);
66 qreal t = tt - (d->lifeSpan - d->lifeLeft());
69 qreal tx = d->x + d->sx * tt + 0.5 * d->ax * tt * tt;
70 qreal ty = d->y + d->sy * tt + 0.5 * d->ay * tt * tt;
72 if (QPointF(tx,ty) == target)
75 qreal vX = (target.x() - d->x) / tt;
76 qreal vY = (target.y() - d->y) / tt;
78 qreal w = 1 - (t / tt) + 0.05;
80 qreal wvX = vX * w + d->sx * (1 - w);
81 qreal wvY = vY * w + d->sy * (1 - w);
82 //Screws with the acceleration so that the given start pos with the chosen weighted velocity will still end at the target coordinates
83 qreal ax = (2*(target.x() - d->x - wvX*tt)) / (tt*tt);
84 qreal ay = (2*(target.y() - d->y - wvY*tt)) / (tt*tt);