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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 FollowEmitter QSGFollowEmitter
\inqmlmodule QtQuick.Particles 2
\inherits QSGParticleEmitter
\brief The FollowEmitter element allows you to emit logical particles from other logical particles.
This element emits logical particles into the ParticleSystem, with the
starting positions based on those of other logical particles.
*/
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 string QtQuick.Particles2::FollowEmitter::follow
The type of logical particle which this is emitting from.
*/
/*!
\qmlproperty Shape QtQuick.Particles2::FollowEmitter::emitShape
As the area of a FollowEmitter is the area it follows, a separate shape can be provided
to be the shape it emits out of.
*/
/*!
\qmlproperty real QtQuick.Particles2::FollowEmitter::emitWidth
*/
/*!
\qmlproperty real QtQuick.Particles2::FollowEmitter::emitHeight
*/
/*!
\qmlproperty real QtQuick.Particles2::FollowEmitter::emitRatePerParticle
*/
/*!
\qmlsignal QtQuick.Particles2::FollowEmitter::emitFollowParticle(particle, followed)
This handler is called when a particle is emitted. You can modify particle
attributes from within the handler. followed is the particle that this is being
emitted off of.
If you use this signal handler, emitParticle will not be emitted.
*/
bool QSGFollowEmitter::isEmitFollowConnected()
{
static int idx = QObjectPrivate::get(this)->signalIndex("emitFollowParticle(QDeclarativeV8Handle,QDeclarativeV8Handle)");
return QObjectPrivate::get(this)->isSignalConnected(idx);
}
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;
}
}
//TODO: Implement startTime and speedFromMovement
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, !m_overwrite);
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->vx * followT + d->ax * followT2 - m_emitterXVariation/2,
d->y - offset.y() + d->vy * followT + d->ay * followT2 - m_emitterYVariation/2,
m_emitterXVariation,
m_emitterYVariation);
// QRectF boundsRect(d->x + d->vx * followT + d->ax * followT2 + offset.x() - sizeOffset,
// d->y + d->vy * 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->vx = speed.x()
+ m_speed_from_movement * d->vx;
datum->vy = speed.y();
+ m_speed_from_movement * d->vy;
// 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);
if (isEmitFollowConnected())
emitFollowParticle(datum->v8Value(), d->v8Value());//A chance for many arbitrary JS changes
else if (isEmitConnected())
emitParticle(datum->v8Value());//A chance for arbitrary JS changes
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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