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/****************************************************************************
**
** 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 "qsgfollowemitter_p.h"
#include "qsgparticlepainter_p.h"//TODO: What was this for again?
#include <cmath>
QT_BEGIN_NAMESPACE
/*!
\qmlclass Emitter QSGBasicEmitter
\inqmlmodule QtQuick.Particles 2
\since QtQuick.Particles 2.0
\brief The Emitter element allows you to emit logical particles.
This element emits logical particles into the ParticleSystem, with the
given starting attributes.
Note that logical particles are not
automatically rendered, you will need to have one or more
ParticlePainter elements visualizing them.
Note that the given starting attributes can be modified at any point
in the particle's lifetime by any Affector element in the same
ParticleSystem. This includes attributes like lifespan.
*/
QSGFollowEmitter::QSGFollowEmitter(QSGItem *parent) :
QSGParticleEmitter(parent)
, m_particlesPerParticlePerSecond(0)
, m_lastTimeStamp(0)
, m_emitterXVariation(0)
, m_emitterYVariation(0)
, m_followCount(0)
, m_emissionExtruder(0)
, m_defaultEmissionExtruder(new QSGParticleExtruder(this))
{
//TODO: If followed increased their size
connect(this, SIGNAL(followChanged(QString)),
this, SLOT(recalcParticlesPerSecond()));
connect(this, SIGNAL(particleDurationChanged(int)),
this, SLOT(recalcParticlesPerSecond()));
connect(this, SIGNAL(particlesPerParticlePerSecondChanged(int)),
this, SLOT(recalcParticlesPerSecond()));
}
/*!
\qmlproperty ParticleSystem QtQuick.Particles2::FollowEmitter::system
This is the Particle system that the FollowEmitter will emit into.
This can be omitted if the FollowEmitter is a direct child of the ParticleSystem
*/
/*!
\qmlproperty string QtQuick.Particles2::FollowEmitter::particle
*/
/*!
\qmlproperty string QtQuick.Particles2::FollowEmitter::follow
*/
/*!
\qmlproperty Shape QtQuick.Particles2::FollowEmitter::shape
*/
/*!
\qmlproperty Shape QtQuick.Particles2::FollowEmitter::emitShape
*/
/*!
\qmlproperty real QtQuick.Particles2::FollowEmitter::emitWidth
*/
/*!
\qmlproperty real QtQuick.Particles2::FollowEmitter::emitHeight
*/
/*!
\qmlproperty bool QtQuick.Particles2::FollowEmitter::emitting
*/
/*!
\qmlproperty real QtQuick.Particles2::FollowEmitter::emitRatePerParticle
*/
/*!
\qmlproperty int QtQuick.Particles2::FollowEmitter::lifeSpan
*/
/*!
\qmlproperty int QtQuick.Particles2::FollowEmitter::lifeSpanVariation
*/
/*!
\qmlproperty int QtQuick.Particles2::FollowEmitter::emitCap
*/
/*!
\qmlproperty real QtQuick.Particles2::FollowEmitter::size
*/
/*!
\qmlproperty real QtQuick.Particles2::FollowEmitter::endSize
*/
/*!
\qmlproperty real QtQuick.Particles2::FollowEmitter::sizeVariation
*/
/*!
\qmlproperty StochasticDirection QtQuick.Particles2::FollowEmitter::speed
*/
/*!
\qmlproperty StochasticDirection QtQuick.Particles2::FollowEmitter::acceleration
*/
/*!
\qmlproperty qreal QtQuick.Particles2::FollowEmitter::speedFromMovement
*/
void QSGFollowEmitter::recalcParticlesPerSecond(){
if (!m_system)
return;
m_followCount = m_system->m_groupData[m_system->m_groupIds[m_follow]]->size();
if (!m_followCount){
setParticlesPerSecond(1);//XXX: Fix this horrendous hack, needed so they aren't turned off from start (causes crashes - test that when gone you don't crash with 0 PPPS)
}else{
setParticlesPerSecond(m_particlesPerParticlePerSecond * m_followCount);
m_lastEmission.resize(m_followCount);
m_lastEmission.fill(m_lastTimeStamp);
}
}
void QSGFollowEmitter::reset()
{
m_followCount = 0;
}
void QSGFollowEmitter::emitWindow(int timeStamp)
{
if (m_system == 0)
return;
if (!m_emitting && !m_burstLeft && m_burstQueue.isEmpty())
return;
if (m_followCount != m_system->m_groupData[m_system->m_groupIds[m_follow]]->size()){
qreal oldPPS = m_particlesPerSecond;
recalcParticlesPerSecond();
if (m_particlesPerSecond != oldPPS)
return;//system may need to update
}
if (m_burstLeft){
m_burstLeft -= timeStamp - m_lastTimeStamp * 1000.;
if (m_burstLeft < 0){
timeStamp += m_burstLeft;
m_burstLeft = 0;
}
}
qreal time = timeStamp / 1000.;
qreal particleRatio = 1. / m_particlesPerParticlePerSecond;
qreal pt;
//Have to map it into this system, because particlesystem automaps it back
QPointF offset = m_system->mapFromItem(this, QPointF(0, 0));
qreal sizeAtEnd = m_particleEndSize >= 0 ? m_particleEndSize : m_particleSize;
int gId = m_system->m_groupIds[m_follow];
int gId2 = m_system->m_groupIds[m_particle];
foreach (QSGParticleData *d, m_system->m_groupData[gId]->data){
if (!d || !d->stillAlive()){
m_lastEmission[d->index] = time; //Should only start emitting when it returns to life
continue;
}
pt = m_lastEmission[d->index];
if (pt < d->t)
pt = d->t;
if ((width() || height()) && !effectiveExtruder()->contains(QRectF(offset.x(), offset.y(), width(), height()),QPointF(d->curX(), d->curY()))){
m_lastEmission[d->index] = time;//jump over this time period without emitting, because it's outside
continue;
}
while (pt < time || !m_burstQueue.isEmpty()){
QSGParticleData* datum = m_system->newDatum(gId2);
if (datum){//else, skip this emission
datum->e = this;//###useful?
// Particle timestamp
datum->t = pt;
datum->lifeSpan =
(m_particleDuration
+ ((rand() % ((m_particleDurationVariation*2) + 1)) - m_particleDurationVariation))
/ 1000.0;
// Particle position
// Note that burst location doesn't get used for follow emitter
qreal followT = pt - d->t;
qreal followT2 = followT * followT * 0.5;
qreal sizeOffset = d->size/2;//TODO: Current size? As an option
//TODO: Set variations
//Subtract offset, because PS expects this in emitter coordinates
QRectF boundsRect(d->x - offset.x() + d->sx * followT + d->ax * followT2 - m_emitterXVariation/2,
d->y - offset.y() + d->sy * followT + d->ay * followT2 - m_emitterYVariation/2,
m_emitterXVariation,
m_emitterYVariation);
// QRectF boundsRect(d->x + d->sx * followT + d->ax * followT2 + offset.x() - sizeOffset,
// d->y + d->sy * followT + d->ay * followT2 + offset.y() - sizeOffset,
// sizeOffset*2,
// sizeOffset*2);
QSGParticleExtruder* effectiveEmissionExtruder = m_emissionExtruder ? m_emissionExtruder : m_defaultEmissionExtruder;
const QPointF &newPos = effectiveEmissionExtruder->extrude(boundsRect);
datum->x = newPos.x();
datum->y = newPos.y();
// Particle speed
const QPointF &speed = m_speed->sample(newPos);
datum->sx = speed.x();
datum->sy = speed.y();
// Particle acceleration
const QPointF &accel = m_acceleration->sample(newPos);
datum->ax = accel.x();
datum->ay = accel.y();
// Particle size
float sizeVariation = -m_particleSizeVariation
+ rand() / float(RAND_MAX) * m_particleSizeVariation * 2;
float size = qMax((qreal)0.0, m_particleSize + sizeVariation);
float endSize = qMax((qreal)0.0, sizeAtEnd + sizeVariation);
datum->size = size * float(m_emitting);
datum->endSize = endSize * float(m_emitting);
m_system->emitParticle(datum);
}
if (!m_burstQueue.isEmpty()){
m_burstQueue.first().first--;
if (m_burstQueue.first().first <= 0)
m_burstQueue.pop_front();
}else{
pt += particleRatio;
}
}
m_lastEmission[d->index] = pt;
}
m_lastTimeStamp = time;
}
QT_END_NAMESPACE
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