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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 "qsgcustomemitter_p.h"
#include "qsgparticlesystem_p.h"
QT_BEGIN_NAMESPACE
/*!
\qmlclass CustomEmitter QSGCustomEmitter
\inqmlmodule QtQuick.Particles 2
\inherits Emitter
\brief The Custom emitter allows you to modify particles as they are emitted
*/
//TODO: Document particle 'type'
/*!
\qmlsignal CustomEmitter::emitting(particle)
This handler is called when a particle is emitted. You can modify particle
attributes from within the handler.
*/
QSGCustomEmitter::QSGCustomEmitter(QSGItem* parent)
: QSGParticleEmitter(parent)
, m_particle_count(0)
, m_reset_last(true)
, m_last_timestamp(0)
, m_last_emission(0)
{
}
void QSGCustomEmitter::reset()
{
m_reset_last = true;
}
void QSGCustomEmitter::emitWindow(int timeStamp)
{
if (m_system == 0)
return;
if ((!m_emitting || !m_particlesPerSecond)&& !m_burstLeft && m_burstQueue.isEmpty()){
m_reset_last = true;
return;
}
if (m_reset_last) {
m_last_emitter = m_last_last_emitter = QPointF(x(), y());
m_last_timestamp = timeStamp/1000.;
m_last_emission = m_last_timestamp;
m_reset_last = false;
}
if (m_burstLeft){
m_burstLeft -= timeStamp - m_last_timestamp * 1000.;
if (m_burstLeft < 0){
if (!m_emitting)
timeStamp += m_burstLeft;
m_burstLeft = 0;
}
}
qreal time = timeStamp / 1000.;
qreal particleRatio = 1. / m_particlesPerSecond;
qreal pt = m_last_emission;
qreal opt = pt; // original particle time
qreal dt = time - m_last_timestamp; // timestamp delta...
if (!dt)
dt = 0.000001;
// emitter difference since last...
qreal dex = (x() - m_last_emitter.x());
qreal dey = (y() - m_last_emitter.y());
qreal sizeAtEnd = m_particleEndSize >= 0 ? m_particleEndSize : m_particleSize;
qreal emitter_x_offset = m_last_emitter.x() - x();
qreal emitter_y_offset = m_last_emitter.y() - y();
if (!m_burstQueue.isEmpty() && !m_burstLeft && !m_emitting)//'outside time' emissions only
pt = time;
while (pt < time || !m_burstQueue.isEmpty()) {
//int pos = m_last_particle % m_particle_count;
QSGParticleData* datum = m_system->newDatum(m_system->m_groupIds[m_particle]);
if (datum){//actually emit(otherwise we've been asked to skip this one)
datum->e = this;//###useful?
qreal t = 1 - (pt - opt) / dt;
// Particle timestamp
datum->t = pt;
datum->lifeSpan = //TODO:Promote to base class?
(m_particleDuration
+ ((rand() % ((m_particleDurationVariation*2) + 1)) - m_particleDurationVariation))
/ 1000.0;
// Particle position
QRectF boundsRect;
if (!m_burstQueue.isEmpty()){
boundsRect = QRectF(m_burstQueue.first().second.x() - x(), m_burstQueue.first().second.y() - y(),
width(), height());
} else {
boundsRect = QRectF(emitter_x_offset + dex * (pt - opt) / dt, emitter_y_offset + dey * (pt - opt) / dt
, width(), height());
}
QPointF newPos = effectiveExtruder()->extrude(boundsRect);
datum->x = newPos.x();
datum->y = newPos.y();
// Particle speed
const QPointF &speed = m_speed->sample(newPos);
datum->vx = speed.x();
datum->vy = 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;
datum->endSize = endSize;
emitParticle(datum->v8Value());//A chance for arbitrary JS changes
m_system->emitParticle(datum);
}
if (m_burstQueue.isEmpty()){
pt += particleRatio;
}else{
m_burstQueue.first().first--;
if (m_burstQueue.first().first <= 0)
m_burstQueue.pop_front();
}
}
m_last_emission = pt;
m_last_last_last_emitter = m_last_last_emitter;
m_last_last_emitter = m_last_emitter;
m_last_emitter = QPointF(x(), y());
m_last_timestamp = time;
}
QT_END_NAMESPACE
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