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Diffstat (limited to 'src/quick/particles/qquicktargetdirection.cpp')
| -rw-r--r-- | src/quick/particles/qquicktargetdirection.cpp | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/quick/particles/qquicktargetdirection.cpp b/src/quick/particles/qquicktargetdirection.cpp new file mode 100644 index 0000000000..eb2eb16c6e --- /dev/null +++ b/src/quick/particles/qquicktargetdirection.cpp @@ -0,0 +1,131 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qquicktargetdirection_p.h" +#include "qquickparticleemitter_p.h" +#include <cmath> +#include <QDebug> + +QT_BEGIN_NAMESPACE +/*! + \qmlclass TargetDirection QQuickTargetDirection + \inqmlmodule QtQuick.Particles 2 + \inherits Direction + \brief The TargetDirection element allows you to specify a direction towards the target point + +*/ +/*! + \qmlproperty real QtQuick.Particles2::TargetDirection::targetX +*/ +/*! + \qmlproperty real QtQuick.Particles2::TargetDirection::targetY +*/ +/*! + \qmlproperty Item QtQuick.Particles2::TargetDirection::targetItem + If specified, this will take precedence over targetX and targetY. + The targeted point will be the center of the specified Item +*/ +/*! + \qmlproperty real QtQuick.Particles2::TargetDirection::targetVariation +*/ +/*! + \qmlproperty real QtQuick.Particles2::TargetDirection::magnitude +*/ +/*! + \qmlproperty real QtQuick.Particles2::TargetDirection::magnitudeVariation +*/ +/*! + \qmlproperty bool QtQuick.Particles2::TargetDirection::proportionalMagnitude + + If true, then the value of magnitude and magnitudeVariation shall be interpreted as multiples + of the distance between the source point and the target point, per second. + + If false(default), then the value of magnitude and magnitudeVariation shall be interpreted as + pixels per second. +*/ + +QQuickTargetDirection::QQuickTargetDirection(QObject *parent) : + QQuickDirection(parent) + , m_targetX(0) + , m_targetY(0) + , m_targetVariation(0) + , m_proportionalMagnitude(false) + , m_magnitude(0) + , m_magnitudeVariation(0) + , m_targetItem(0) +{ +} + +const QPointF QQuickTargetDirection::sample(const QPointF &from) +{ + //###This approach loses interpolating the last position of the target (like we could with the emitter) is it worthwhile? + QPointF ret; + qreal targetX; + qreal targetY; + if (m_targetItem){ + QQuickParticleEmitter* parentEmitter = qobject_cast<QQuickParticleEmitter*>(parent()); + targetX = m_targetItem->width()/2; + targetY = m_targetItem->height()/2; + if (!parentEmitter){ + qWarning() << "Directed vector is not a child of the emitter. Mapping of target item coordinates may fail."; + targetX += m_targetItem->x(); + targetY += m_targetItem->y(); + }else{ + ret = parentEmitter->mapFromItem(m_targetItem, QPointF(targetX, targetY)); + targetX = ret.x(); + targetY = ret.y(); + } + }else{ + targetX = m_targetX; + targetY = m_targetY; + } + targetX += 0 - from.x() - m_targetVariation + rand()/(float)RAND_MAX * m_targetVariation*2; + targetY += 0 - from.y() - m_targetVariation + rand()/(float)RAND_MAX * m_targetVariation*2; + qreal theta = atan2(targetY, targetX); + qreal mag = m_magnitude + rand()/(float)RAND_MAX * m_magnitudeVariation * 2 - m_magnitudeVariation; + if (m_proportionalMagnitude) + mag *= sqrt(targetX * targetX + targetY * targetY); + ret.setX(mag * cos(theta)); + ret.setY(mag * sin(theta)); + return ret; +} + +QT_END_NAMESPACE |