From a129444bb0156c936900dbd2f12bd9f427ff366c Mon Sep 17 00:00:00 2001
From: Qt by Nokia <qt-info@nokia.com>
Date: Wed, 27 Apr 2011 14:13:26 +0200
Subject: Initial import from qtquick2.

Branched from the monolithic repo, Qt qtquick2 branch, at commit
a4a585d2ee907746682846ae6e8a48e19deef469
---
 src/imports/particles/attractoraffector.cpp | 66 +++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 src/imports/particles/attractoraffector.cpp

(limited to 'src/imports/particles/attractoraffector.cpp')

diff --git a/src/imports/particles/attractoraffector.cpp b/src/imports/particles/attractoraffector.cpp
new file mode 100644
index 0000000000..847cb2c471
--- /dev/null
+++ b/src/imports/particles/attractoraffector.cpp
@@ -0,0 +1,66 @@
+/****************************************************************************
+**
+** 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 Declarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "attractoraffector.h"
+#include <cmath>
+#include <QDebug>
+QT_BEGIN_NAMESPACE
+AttractorAffector::AttractorAffector(QSGItem *parent) :
+    ParticleAffector(parent), m_strength(0.0), m_x(0), m_y(0)
+{
+}
+
+bool AttractorAffector::affectParticle(ParticleData *d, qreal dt)
+{
+    if(m_strength == 0.0)
+        return false;
+    qreal dx = m_x - d->curX();
+    qreal dy = m_y - d->curY();
+    qreal r = sqrt((dx*dx) + (dy*dy));
+    qreal theta = atan2(dy,dx);
+    qreal ds = (m_strength / r) * dt;
+    dx = ds * cos(theta);
+    dy = ds * sin(theta);
+    d->setInstantaneousSX(d->pv.sx + dx);
+    d->setInstantaneousSY(d->pv.sy + dy);
+    return true;
+}
+QT_END_NAMESPACE
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