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Diffstat (limited to 'src/declarative/graphicsitems/qmlgraphicsparticles.cpp')
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diff --git a/src/declarative/graphicsitems/qmlgraphicsparticles.cpp b/src/declarative/graphicsitems/qmlgraphicsparticles.cpp deleted file mode 100644 index 3f4521e..0000000 --- a/src/declarative/graphicsitems/qmlgraphicsparticles.cpp +++ /dev/null @@ -1,1244 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). -** All rights reserved. -** Contact: Nokia Corporation (qt-info@nokia.com) -** -** This file is part of the QtDeclarative 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 "qmlgraphicsparticles_p.h" - -#include "qmlgraphicsitem_p.h" - -#include <qmlpixmapcache_p.h> -#include <qfxperf_p_p.h> -#include <qmlanimation_p_p.h> - -#include <QNetworkReply> -#include <QPainter> -#include <QtGui/qdrawutil.h> -#include <QVarLengthArray> - -#include <stdlib.h> -#include <math.h> - -#ifndef M_PI -#define M_PI 3.14159265358979323846 -#define M_PI_2 (M_PI / 2.) -#endif -#ifndef INT_MAX -#define INT_MAX 2147483647 -#endif - -QT_BEGIN_NAMESPACE -#define PI_SQR 9.8696044 -// parabolic approximation -inline qreal fastSin(qreal theta) -{ - const qreal b = 4 / M_PI; - const qreal c = -4 / PI_SQR; - - qreal y = b * theta + c * theta * qAbs(theta); - return y; -} - -inline qreal fastCos(qreal theta) -{ - theta += M_PI_2; - if (theta > M_PI) - theta -= 2 * M_PI; - - return fastSin(theta); -} - -class QmlGraphicsParticle -{ -public: - QmlGraphicsParticle(int time) : lifeSpan(1000), fadeOutAge(800) - , opacity(0), birthTime(time), x_velocity(0), y_velocity(0) - , state(FadeIn), data(0) - { - } - - int lifeSpan; - int fadeOutAge; - qreal x; - qreal y; - qreal opacity; - int birthTime; - qreal x_velocity; - qreal y_velocity; - enum State { FadeIn, Solid, FadeOut }; - State state; - void *data; -}; - -//--------------------------------------------------------------------------- - -/*! - \class QmlGraphicsParticleMotion - \ingroup group_effects - \brief The QmlGraphicsParticleMotion class is the base class for particle motion. - \internal - - This class causes the particles to remain static. -*/ - -/*! - Constructs a QmlGraphicsParticleMotion with parent object \a parent. -*/ -QmlGraphicsParticleMotion::QmlGraphicsParticleMotion(QObject *parent) : - QObject(parent) -{ -} - -/*! - Move the \a particle to its new position. \a interval is the number of - milliseconds elapsed since it was last moved. -*/ -void QmlGraphicsParticleMotion::advance(QmlGraphicsParticle &particle, int interval) -{ - Q_UNUSED(particle); - Q_UNUSED(interval); -} - -/*! - The \a particle has just been created. Some motion strategies require - additional state information. This can be allocated by this function. -*/ -void QmlGraphicsParticleMotion::created(QmlGraphicsParticle &particle) -{ - Q_UNUSED(particle); -} - -/*! - The \a particle is about to be destroyed. Any additional memory - that has been allocated for the particle should be freed. -*/ -void QmlGraphicsParticleMotion::destroy(QmlGraphicsParticle &particle) -{ - Q_UNUSED(particle); -} - -/*! - \qmlclass ParticleMotionLinear - \since 4.7 - \brief The ParticleMotionLinear object moves particles linearly. - - \sa Particles -*/ - -/*! - \internal - \class QmlGraphicsParticleMotionLinear - \ingroup group_effects - \brief The QmlGraphicsParticleMotionLinear class moves the particles linearly. -*/ - -void QmlGraphicsParticleMotionLinear::advance(QmlGraphicsParticle &p, int interval) -{ - p.x += interval * p.x_velocity; - p.y += interval * p.y_velocity; -} - -/*! - \qmlclass ParticleMotionGravity - \since 4.7 - \brief The ParticleMotionGravity object moves particles towards a point. - - \sa Particles -*/ - -/*! - \internal - \class QmlGraphicsParticleMotionGravity - \ingroup group_effects - \brief The QmlGraphicsParticleMotionGravity class moves the particles towards a point. -*/ - -/*! - \qmlproperty int ParticleMotionGravity::xattractor - \qmlproperty int ParticleMotionGravity::yattractor - These properties hold the x and y coordinates of the point attracting the particles. -*/ - -/*! - \qmlproperty int ParticleMotionGravity::acceleration - This property holds the acceleration to apply to the particles. -*/ - -/*! - \property QmlGraphicsParticleMotionGravity::xattractor - \brief the x coordinate of the point attracting the particles. -*/ - -/*! - \property QmlGraphicsParticleMotionGravity::yattractor - \brief the y coordinate of the point attracting the particles. -*/ - -/*! - \property QmlGraphicsParticleMotionGravity::acceleration - \brief the acceleration to apply to the particles. -*/ - -void QmlGraphicsParticleMotionGravity::advance(QmlGraphicsParticle &p, int interval) -{ - qreal xdiff = p.x - _xAttr; - qreal ydiff = p.y - _yAttr; - - qreal xcomp = xdiff / (xdiff + ydiff); - qreal ycomp = ydiff / (xdiff + ydiff); - - p.x_velocity += xcomp * _accel * interval; - p.y_velocity += ycomp * _accel * interval; - - p.x += interval * p.x_velocity; - p.y += interval * p.y_velocity; -} - -/*! - \qmlclass ParticleMotionWander - \since 4.7 - \brief The ParticleMotionWander object moves particles in a somewhat random fashion. - - The particles will continue roughly in the original direction, however will randomly - drift to each side. - - The code below produces an effect similar to falling snow. - - \qml -Rectangle { - width: 240 - height: 320 - color: "black" - - Particles { - y: 0 - width: parent.width - height: 30 - source: "star.png" - lifeSpan: 5000 - count: 50 - angle: 70 - angleDeviation: 36 - velocity: 30 - velocityDeviation: 10 - ParticleMotionWander { - xvariance: 30 - pace: 100 - } - } -} - \endqml - - \sa Particles -*/ - -/*! - \internal - \class QmlGraphicsParticleMotionWander - \ingroup group_effects - \brief The QmlGraphicsParticleMotionWander class moves particles in a somewhat random fashion. - - The particles will continue roughly in the original direction, however will randomly - drift to each side. -*/ - -/*! - \qmlproperty int QmlGraphicsParticleMotionWander::xvariance - \qmlproperty int QmlGraphicsParticleMotionWander::yvariance - - These properties set the amount to wander in the x and y directions. -*/ - -/*! - \qmlproperty int QmlGraphicsParticleMotionWander::pace - This property holds how quickly the paricles will move from side to side. -*/ - -void QmlGraphicsParticleMotionWander::advance(QmlGraphicsParticle &p, int interval) -{ - if (!particles) - particles = qobject_cast<QmlGraphicsParticles*>(parent()); - if (particles) { - Data *d = (Data*)p.data; - if (_xvariance != 0.) { - qreal xdiff = p.x_velocity - d->x_targetV; - if ((xdiff > d->x_peak && d->x_var > 0.0) || (xdiff < -d->x_peak && d->x_var < 0.0)) { - d->x_var = -d->x_var; - d->x_peak = _xvariance + _xvariance * qreal(qrand()) / RAND_MAX; - } - p.x_velocity += d->x_var * interval; - } - p.x += interval * p.x_velocity; - - if (_yvariance != 0.) { - qreal ydiff = p.y_velocity - d->y_targetV; - if ((ydiff > d->y_peak && d->y_var > 0.0) || (ydiff < -d->y_peak && d->y_var < 0.0)) { - d->y_var = -d->y_var; - d->y_peak = _yvariance + _yvariance * qreal(qrand()) / RAND_MAX; - } - p.y_velocity += d->y_var * interval; - } - p.y += interval * p.y_velocity; - } -} - -void QmlGraphicsParticleMotionWander::created(QmlGraphicsParticle &p) -{ - if (!p.data) { - Data *d = new Data; - p.data = (void*)d; - d->x_targetV = p.x_velocity; - d->y_targetV = p.y_velocity; - d->x_peak = _xvariance; - d->y_peak = _yvariance; - d->x_var = _pace * qreal(qrand()) / RAND_MAX / 1000.0; - d->y_var = _pace * qreal(qrand()) / RAND_MAX / 1000.0; - } -} - -void QmlGraphicsParticleMotionWander::destroy(QmlGraphicsParticle &p) -{ - if (p.data) - delete (Data*)p.data; -} - -//--------------------------------------------------------------------------- -class QmlGraphicsParticlesPainter : public QmlGraphicsItem -{ -public: - QmlGraphicsParticlesPainter(QmlGraphicsParticlesPrivate *p, QmlGraphicsItem* parent) - : QmlGraphicsItem(parent), d(p) - { - setFlag(QGraphicsItem::ItemHasNoContents, false); - maxX = minX = maxY = minY = 0; - } - - void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *); - - void updateSize(); - - qreal maxX; - qreal minX; - qreal maxY; - qreal minY; - QmlGraphicsParticlesPrivate* d; -}; - -//--------------------------------------------------------------------------- -class QmlGraphicsParticlesPrivate : public QmlGraphicsItemPrivate -{ - Q_DECLARE_PUBLIC(QmlGraphicsParticles) -public: - QmlGraphicsParticlesPrivate() - : count(1), emissionRate(-1), emissionVariance(0.5), lifeSpan(1000) - , lifeSpanDev(1000), fadeInDur(200), fadeOutDur(300) - , angle(0), angleDev(0), velocity(0), velocityDev(0), emissionCarry(0.) - , addParticleTime(0), addParticleCount(0), lastAdvTime(0) - , motion(0), pendingPixmapCache(false), clock(this) - { - } - - ~QmlGraphicsParticlesPrivate() - { - } - - void init() - { - Q_Q(QmlGraphicsParticles); - paintItem = new QmlGraphicsParticlesPainter(this, q); - } - - void tick(int time); - void createParticle(int time); - void updateOpacity(QmlGraphicsParticle &p, int age); - - QUrl url; - QPixmap image; - int count; - int emissionRate; - qreal emissionVariance; - int lifeSpan; - int lifeSpanDev; - int fadeInDur; - int fadeOutDur; - qreal angle; - qreal angleDev; - qreal velocity; - qreal velocityDev; - qreal emissionCarry; - int addParticleTime; - int addParticleCount; - int lastAdvTime; - QmlGraphicsParticleMotion *motion; - QmlGraphicsParticlesPainter *paintItem; - - bool pendingPixmapCache; - - QList<QPair<int, int> > bursts;//countLeft, emissionRate pairs - QList<QmlGraphicsParticle> particles; - QTickAnimationProxy<QmlGraphicsParticlesPrivate, &QmlGraphicsParticlesPrivate::tick> clock; - -}; - -void QmlGraphicsParticlesPrivate::tick(int time) -{ - Q_Q(QmlGraphicsParticles); - if (!motion) - motion = new QmlGraphicsParticleMotionLinear(q); - - int oldCount = particles.count(); - int removed = 0; - int interval = time - lastAdvTime; - for (int i = 0; i < particles.count(); ) { - QmlGraphicsParticle &particle = particles[i]; - int age = time - particle.birthTime; - if (age >= particle.lifeSpan) { - QmlGraphicsParticle part = particles.takeAt(i); - motion->destroy(part); - ++removed; - } else { - updateOpacity(particle, age); - motion->advance(particle, interval); - ++i; - } - } - - if(emissionRate == -1)//Otherwise leave emission to the emission rate - while(removed-- && ((count == -1) || particles.count() < count)) - createParticle(time); - - if (!addParticleTime) - addParticleTime = time; - - //Possibly emit new particles - if (((count == -1) || particles.count() < count) && emissionRate - && !(count==-1 && emissionRate==-1)) { - int emissionCount = -1; - if (emissionRate != -1){ - qreal variance = 1.; - if (emissionVariance > 0.){ - variance += (qreal(qrand())/RAND_MAX) * emissionVariance * (qrand()%2?-1.:1.); - } - qreal emission = emissionRate * (qreal(interval)/1000.); - emission = emission * variance + emissionCarry; - double tmpDbl; - emissionCarry = modf(emission, &tmpDbl); - emissionCount = (int)tmpDbl; - emissionCount = qMax(0,emissionCount); - } - while(((count == -1) || particles.count() < count) && - (emissionRate==-1 || emissionCount--)) - createParticle(time); - } - - //Deal with emissions from requested bursts - for(int i=0; i<bursts.size(); i++){ - int emission = 0; - if(bursts[i].second == -1){ - emission = bursts[i].first; - }else{ - qreal variance = 1.; - if (emissionVariance > 0.){ - variance += (qreal(qrand())/RAND_MAX) * emissionVariance * (qrand()%2?-1.:1.); - } - qreal workingEmission = bursts[i].second * (qreal(interval)/1000.); - workingEmission *= variance; - emission = (int)workingEmission; - emission = qMax(emission, 0); - } - emission = qMin(emission, bursts[i].first); - bursts[i].first -= emission; - while(emission--) - createParticle(time); - } - for(int i=bursts.size()-1; i>=0; i--) - if(bursts[i].first <= 0) - bursts.removeAt(i); - - lastAdvTime = time; - paintItem->updateSize(); - paintItem->update(); - if (!(oldCount || particles.count()) && (!count || !emissionRate) && bursts.isEmpty()) { - lastAdvTime = 0; - clock.stop(); - } -} - -void QmlGraphicsParticlesPrivate::createParticle(int time) -{ -#ifdef Q_ENABLE_PERFORMANCE_LOG - QmlPerfTimer<QmlPerf::CreateParticle> x; -#endif - Q_Q(QmlGraphicsParticles); - QmlGraphicsParticle p(time); - p.x = q->x() + q->width() * qreal(qrand()) / RAND_MAX - image.width()/2.0; - p.y = q->y() + q->height() * qreal(qrand()) / RAND_MAX - image.height()/2.0; - p.lifeSpan = lifeSpan; - if (lifeSpanDev) - p.lifeSpan += int(lifeSpanDev/2 - lifeSpanDev * qreal(qrand()) / RAND_MAX); - p.fadeOutAge = p.lifeSpan - fadeOutDur; - if (fadeInDur == 0.) { - p.state= QmlGraphicsParticle::Solid; - p.opacity = 1.0; - } - qreal a = angle; - if (angleDev) - a += angleDev/2 - angleDev * qreal(qrand()) / RAND_MAX; - if (a > M_PI) - a = a - 2 * M_PI; - qreal v = velocity; - if (velocityDev) - v += velocityDev/2 - velocityDev * qreal(qrand()) / RAND_MAX; - p.x_velocity = v * fastCos(a); - p.y_velocity = v * fastSin(a); - particles.append(p); - motion->created(particles.last()); -} - -void QmlGraphicsParticlesPrivate::updateOpacity(QmlGraphicsParticle &p, int age) -{ - switch (p.state) { - case QmlGraphicsParticle::FadeIn: - if (age <= fadeInDur) { - p.opacity = qreal(age) / fadeInDur; - break; - } else { - p.opacity = 1.0; - p.state = QmlGraphicsParticle::Solid; - // Fall through - } - case QmlGraphicsParticle::Solid: - if (age <= p.fadeOutAge) { - break; - } else { - p.state = QmlGraphicsParticle::FadeOut; - // Fall through - } - case QmlGraphicsParticle::FadeOut: - p.opacity = qreal(p.lifeSpan - age) / fadeOutDur; - break; - } -} - -/*! - \qmlclass Particles - \since 4.7 - \brief The Particles object generates and moves particles. - \inherits Item - - This element provides preliminary support for particles in QML, - and may be heavily changed or removed in later versions. - - The particles created by this object cannot be dealt with - directly, they can only be controlled through the parameters of - the Particles object. The particles are all the same pixmap, - specified by the user. - - The particles are painted relative to the parent of the Particles - object. Moving the Particles object will not move the particles - already emitted. - - The below example creates two differently behaving particle - sources. The top one has particles falling from the top like - snow, the lower one has particles expelled up like a fountain. - - \qml -Rectangle { - width: 240 - height: 320 - color: "black" - Particles { - y: 0 - width: parent.width - height: 30 - source: "star.png" - lifeSpan: 5000 - count: 50 - angle: 70 - angleDeviation: 36 - velocity: 30 - velocityDeviation: 10 - ParticleMotionWander { - xvariance: 30 - pace: 100 - } - } - Particles { - y: 300 - x: 120 - width: 1 - height: 1 - source: "star.png" - lifeSpan: 5000 - count: 200 - angle: 270 - angleDeviation: 45 - velocity: 50 - velocityDeviation: 30 - ParticleMotionGravity { - yattractor: 1000 - xattractor: 0 - acceleration: 25 - } - } -} - \endqml - \image particles.gif -*/ - -/*! - \internal - \class QmlGraphicsParticles - \ingroup group_effects - \brief The QmlGraphicsParticles class generates and moves particles. -*/ - -QmlGraphicsParticles::QmlGraphicsParticles(QmlGraphicsItem *parent) - : QmlGraphicsItem(*(new QmlGraphicsParticlesPrivate), parent) -{ - Q_D(QmlGraphicsParticles); - d->init(); -} - -QmlGraphicsParticles::~QmlGraphicsParticles() -{ - Q_D(QmlGraphicsParticles); - if (d->pendingPixmapCache) - QmlPixmapCache::cancel(d->url, this); -} - -/*! - \qmlproperty string Particles::source - This property holds the URL of the particle image. -*/ - -/*! - \property QmlGraphicsParticles::source - \brief the URL of the particle image. -*/ -QUrl QmlGraphicsParticles::source() const -{ - Q_D(const QmlGraphicsParticles); - return d->url; -} - -void QmlGraphicsParticles::imageLoaded() -{ - Q_D(QmlGraphicsParticles); - d->pendingPixmapCache = false; - QmlPixmapCache::get(d->url, &d->image); - d->paintItem->updateSize(); - d->paintItem->update(); -} - -void QmlGraphicsParticles::setSource(const QUrl &name) -{ - Q_D(QmlGraphicsParticles); - - if ((d->url.isEmpty() == name.isEmpty()) && name == d->url) - return; - - if (d->pendingPixmapCache) { - QmlPixmapCache::cancel(d->url, this); - d->pendingPixmapCache = false; - } - if (name.isEmpty()) { - d->url = name; - d->image = QPixmap(); - d->paintItem->updateSize(); - d->paintItem->update(); - } else { - d->url = name; - Q_ASSERT(!name.isRelative()); - QmlPixmapReply::Status status = QmlPixmapCache::get(d->url, &d->image); - if (status != QmlPixmapReply::Ready && status != QmlPixmapReply::Error) { - QmlPixmapReply *reply = QmlPixmapCache::request(qmlEngine(this), d->url); - connect(reply, SIGNAL(finished()), this, SLOT(imageLoaded())); - d->pendingPixmapCache = true; - } else { - //### unify with imageLoaded - d->paintItem->updateSize(); - d->paintItem->update(); - } - } - emit sourceChanged(); -} - -/*! - \qmlproperty int Particles::count - This property holds the maximum number of particles - - The particles element emits particles until it has count active - particles. When this number is reached, new particles are not emitted until - some of the current particles reach theend of their lifespan. - - If count is -1 then there is no maximum number of active particles, and - particles will be constantly emitted at the rate specified by emissionRate. - - If both count and emissionRate are set to -1, nothing will be emitted. - -*/ - -/*! - \property QmlGraphicsParticles::count - \brief the maximum number of particles -*/ -int QmlGraphicsParticles::count() const -{ - Q_D(const QmlGraphicsParticles); - return d->count; -} - -void QmlGraphicsParticles::setCount(int cnt) -{ - Q_D(QmlGraphicsParticles); - if (cnt == d->count) - return; - - int oldCount = d->count; - d->count = cnt; - d->addParticleTime = 0; - d->addParticleCount = d->particles.count(); - if (!oldCount && d->clock.state() != QAbstractAnimation::Running && d->count && d->emissionRate) { - d->clock.start(); - } - d->paintItem->updateSize(); - d->paintItem->update(); - emit countChanged(); -} - - -/*! - \qmlproperty int Particles::emissionRate - This property holds the target number of particles to emit every second. - - The particles element will emit up to emissionRate particles every - second. Fewer particles may be emitted per second if the maximum number of - particles has been reached. - - If emissionRate is set to -1 there is no limit to the number of - particles emitted per second, and particles will be instantly emitted to - reach the maximum number of particles specified by count. - - The default value for emissionRate is -1. - - If both count and emissionRate are set to -1, nothing will be emitted. -*/ - -/*! - \property QmlGraphicsParticles::emissionRate - \brief the emission rate of particles -*/ -int QmlGraphicsParticles::emissionRate() const -{ - Q_D(const QmlGraphicsParticles); - return d->emissionRate; -} -void QmlGraphicsParticles::setEmissionRate(int er) -{ - Q_D(QmlGraphicsParticles); - if(er == d->emissionRate) - return; - d->emissionRate = er; - if (d->clock.state() != QAbstractAnimation::Running && d->count && d->emissionRate) { - d->clock.start(); - } - emit emissionRateChanged(); -} - -/*! - \qmlproperty qreal Particles::emissionVariance - This property holds how inconsistent the rate of particle emissions are. - It is a number between 0 (no variance) and 1 (some variance). - - The expected number of particles emitted per second is emissionRate. If - emissionVariance is 0 then particles will be emitted consistently throughout - each second to reach that number. If emissionVariance is greater than 0 the - rate of particle emission will vary randomly throughout the second, with the - consequence that the actual number of particles emitted in one second will - vary randomly as well. - - emissionVariance is the maximum deviation from emitting - emissionRate particles per second. An emissionVariance of 0 means you should - get exactly emissionRate particles emitted per second, - and an emissionVariance of 1 means you will get between zero and two times - emissionRate particles per second, but you should get emissionRate particles - per second on average. - - Note that even with an emissionVariance of 0 there may be some variance due - to performance and hardware constraints. - - The default value of emissionVariance is 0.5 -*/ - -/*! - \property QmlGraphicsParticles::emissionVariance - \brief how much the particle emission amounts vary per tick -*/ - -qreal QmlGraphicsParticles::emissionVariance() const -{ - Q_D(const QmlGraphicsParticles); - return d->emissionVariance; -} - -void QmlGraphicsParticles::setEmissionVariance(qreal ev) -{ - Q_D(QmlGraphicsParticles); - if(d->emissionVariance == ev) - return; - d->emissionVariance = ev; - emit emissionVarianceChanged(); -} - -/*! - \qmlproperty int Particles::lifeSpan - \qmlproperty int Particles::lifeSpanDeviation - - These properties describe the life span of each particle. - - The default lifespan for a particle is 1000ms. - - lifeSpanDeviation randomly varies the lifeSpan up to the specified variation. For - example, the following creates particles whose lifeSpan will vary - from 150ms to 250ms: - - \qml -Particles { - source: "star.png" - lifeSpan: 200 - lifeSpanDeviation: 100 -} - \endqml -*/ - -/*! - \property QmlGraphicsParticles::lifeSpan - \brief the life span of each particle. - - Default value is 1000ms. - - \sa QmlGraphicsParticles::lifeSpanDeviation -*/ -int QmlGraphicsParticles::lifeSpan() const -{ - Q_D(const QmlGraphicsParticles); - return d->lifeSpan; -} - -void QmlGraphicsParticles::setLifeSpan(int ls) -{ - Q_D(QmlGraphicsParticles); - if(d->lifeSpan == ls) - return; - d->lifeSpan = ls; - emit lifeSpanChanged(); -} - -/*! - \property QmlGraphicsParticles::lifeSpanDeviation - \brief the maximum possible deviation from the set lifeSpan. - - Randomly varies the lifeSpan up to the specified variation. For - example, the following creates particles whose lifeSpan will vary - from 150ms to 250ms: - -\qml -Particles { - source: "star.png" - lifeSpan: 200 - lifeSpanDeviation: 100 -} -\endqml - - \sa QmlGraphicsParticles::lifeSpan -*/ -int QmlGraphicsParticles::lifeSpanDeviation() const -{ - Q_D(const QmlGraphicsParticles); - return d->lifeSpanDev; -} - -void QmlGraphicsParticles::setLifeSpanDeviation(int dev) -{ - Q_D(QmlGraphicsParticles); - if(d->lifeSpanDev == dev) - return; - d->lifeSpanDev = dev; - emit lifeSpanDeviationChanged(); -} - -/*! - \qmlproperty int Particles::fadeInDuration - \qmlproperty int Particles::fadeOutDuration - These properties hold the time taken to fade the particles in and out. - - By default fade in is 200ms and fade out is 300ms. -*/ - -/*! - \property QmlGraphicsParticles::fadeInDuration - \brief the time taken to fade in the particles. - - Default value is 200ms. -*/ -int QmlGraphicsParticles::fadeInDuration() const -{ - Q_D(const QmlGraphicsParticles); - return d->fadeInDur; -} - -void QmlGraphicsParticles::setFadeInDuration(int dur) -{ - Q_D(QmlGraphicsParticles); - if (dur < 0.0 || dur == d->fadeInDur) - return; - d->fadeInDur = dur; - emit fadeInDurationChanged(); -} - -/*! - \property QmlGraphicsParticles::fadeOutDuration - \brief the time taken to fade out the particles. - - Default value is 300ms. -*/ -int QmlGraphicsParticles::fadeOutDuration() const -{ - Q_D(const QmlGraphicsParticles); - return d->fadeOutDur; -} - -void QmlGraphicsParticles::setFadeOutDuration(int dur) -{ - Q_D(QmlGraphicsParticles); - if (dur < 0.0 || d->fadeOutDur == dur) - return; - d->fadeOutDur = dur; - emit fadeOutDurationChanged(); -} - -/*! - \qmlproperty real Particles::angle - \qmlproperty real Particles::angleDeviation - - These properties control particle direction. - - angleDeviation randomly varies the direction up to the specified variation. For - example, the following creates particles whose initial direction will - vary from 15 degrees to 105 degrees: - - \qml -Particles { - source: "star.png" - angle: 60 - angleDeviation: 90 -} - \endqml -*/ - -/*! - \property QmlGraphicsParticles::angle - \brief the initial angle of direction. - - \sa QmlGraphicsParticles::angleDeviation -*/ -qreal QmlGraphicsParticles::angle() const -{ - Q_D(const QmlGraphicsParticles); - return d->angle * 180.0 / M_PI; -} - -void QmlGraphicsParticles::setAngle(qreal angle) -{ - Q_D(QmlGraphicsParticles); - qreal radAngle = angle * M_PI / 180.0; - if(radAngle == d->angle) - return; - d->angle = radAngle; - emit angleChanged(); -} - -/*! - \property QmlGraphicsParticles::angleDeviation - \brief the maximum possible deviation from the set angle. - - Randomly varies the direction up to the specified variation. For - example, the following creates particles whose initial direction will - vary from 15 degrees to 105 degrees: - -\qml -Particles { - source: "star.png" - angle: 60 - angleDeviation: 90 -} -\endqml - - \sa QmlGraphicsParticles::angle -*/ -qreal QmlGraphicsParticles::angleDeviation() const -{ - Q_D(const QmlGraphicsParticles); - return d->angleDev * 180.0 / M_PI; -} - -void QmlGraphicsParticles::setAngleDeviation(qreal dev) -{ - Q_D(QmlGraphicsParticles); - qreal radDev = dev * M_PI / 180.0; - if(radDev == d->angleDev) - return; - d->angleDev = radDev; - emit angleDeviationChanged(); -} - -/*! - \qmlproperty real Particles::velocity - \qmlproperty real Particles::velocityDeviation - - These properties control the velocity of the particles. - - velocityDeviation randomly varies the velocity up to the specified variation. For - example, the following creates particles whose initial velocity will - vary from 40 to 60. - - \qml -Particles { - source: "star.png" - velocity: 50 - velocityDeviation: 20 -} - \endqml -*/ - -/*! - \property QmlGraphicsParticles::velocity - \brief the initial velocity of the particles. - - \sa QmlGraphicsParticles::velocityDeviation -*/ -qreal QmlGraphicsParticles::velocity() const -{ - Q_D(const QmlGraphicsParticles); - return d->velocity * 1000.0; -} - -void QmlGraphicsParticles::setVelocity(qreal velocity) -{ - Q_D(QmlGraphicsParticles); - qreal realVel = velocity / 1000.0; - if(realVel == d->velocity) - return; - d->velocity = realVel; - emit velocityChanged(); -} - -/*! - \property QmlGraphicsParticles::velocityDeviation - \brief the maximum possible deviation from the set velocity. - - Randomly varies the velocity up to the specified variation. For - example, the following creates particles whose initial velocity will - vary from 40 to 60. - -\qml -Particles { - source: "star.png" - velocity: 50 - velocityDeviation: 20 -} -\endqml - - \sa QmlGraphicsParticles::velocity -*/ -qreal QmlGraphicsParticles::velocityDeviation() const -{ - Q_D(const QmlGraphicsParticles); - return d->velocityDev * 1000.0; -} - -void QmlGraphicsParticles::setVelocityDeviation(qreal velocity) -{ - Q_D(QmlGraphicsParticles); - qreal realDev = velocity / 1000.0; - if(realDev == d->velocityDev) - return; - d->velocityDev = realDev; - emit velocityDeviationChanged(); -} - -/*! - \qmlproperty ParticleMotion Particles::motion - This property sets the type of motion to apply to the particles. - - When a particle is created it will have an initial direction and velocity. - The motion of the particle during its lifeSpan is then influenced by the - motion property. - - Default motion is ParticleMotionLinear. -*/ - -/*! - \property QmlGraphicsParticles::motion - \brief sets the type of motion to apply to the particles. - - When a particle is created it will have an initial direction and velocity. - The motion of the particle during its lifeSpan is then influenced by the - motion property. - - Default motion is QmlGraphicsParticleMotionLinear. -*/ -QmlGraphicsParticleMotion *QmlGraphicsParticles::motion() const -{ - Q_D(const QmlGraphicsParticles); - return d->motion; -} - -void QmlGraphicsParticles::setMotion(QmlGraphicsParticleMotion *motion) -{ - Q_D(QmlGraphicsParticles); - d->motion = motion; -} - -/*! - \qmlmethod Particles::burst(int count, int emissionRate) - - Initiates a burst of particles. - - This method takes two arguments. The first argument is the number - of particles to emit and the second argument is the emissionRate for the - burst. If the second argument is omitted, it is treated as -1. The burst - of particles has a separate emissionRate and count to the normal emission of - particles. The burst uses the same values as normal emission for all other - properties, including emissionVariance. - - The normal emission of particles will continue during the burst, however - the particles created by the burst count towards the maximum number used by - normal emission. To avoid this behavior, use two Particles elements. - -*/ -void QmlGraphicsParticles::burst(int count, int emissionRate) -{ - Q_D(QmlGraphicsParticles); - d->bursts << qMakePair(count, emissionRate); - if (d->clock.state() != QAbstractAnimation::Running) - d->clock.start(); -} - -void QmlGraphicsParticlesPainter::updateSize() -{ - if (!isComponentComplete()) - return; - - const int parentX = parentItem()->x(); - const int parentY = parentItem()->y(); - for (int i = 0; i < d->particles.count(); ++i) { - const QmlGraphicsParticle &particle = d->particles.at(i); - if(particle.x > maxX) - maxX = particle.x; - if(particle.x < minX) - minX = particle.x; - if(particle.y > maxY) - maxY = particle.y; - if(particle.y < minY) - minY = particle.y; - } - - int myWidth = (int)(maxX-minX+0.5)+d->image.width(); - int myX = (int)(minX - parentX); - int myHeight = (int)(maxY-minY+0.5)+d->image.height(); - int myY = (int)(minY - parentY); - setWidth(myWidth); - setHeight(myHeight); - setX(myX); - setY(myY); -} - -void QmlGraphicsParticles::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *) -{ - Q_UNUSED(p); - //painting is done by the ParticlesPainter, so it can have the right size -} - -void QmlGraphicsParticlesPainter::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *) -{ - if (d->image.isNull() || d->particles.isEmpty()) - return; - - const int myX = x() + parentItem()->x(); - const int myY = y() + parentItem()->y(); - - QVarLengthArray<QPainter::Fragment, 256> pixmapData; - pixmapData.resize(d->particles.count()); - - const QRectF sourceRect = d->image.rect(); - qreal halfPWidth = sourceRect.width()/2.; - qreal halfPHeight = sourceRect.height()/2.; - for (int i = 0; i < d->particles.count(); ++i) { - const QmlGraphicsParticle &particle = d->particles.at(i); - pixmapData[i].x = particle.x - myX + halfPWidth; - pixmapData[i].y = particle.y - myY + halfPHeight; - pixmapData[i].opacity = particle.opacity; - - //these never change - pixmapData[i].rotation = 0; - pixmapData[i].scaleX = 1; - pixmapData[i].scaleY = 1; - pixmapData[i].sourceLeft = sourceRect.left(); - pixmapData[i].sourceTop = sourceRect.top(); - pixmapData[i].width = sourceRect.width(); - pixmapData[i].height = sourceRect.height(); - } - p->drawPixmapFragments(pixmapData.data(), d->particles.count(), d->image); -} - -void QmlGraphicsParticles::componentComplete() -{ - Q_D(QmlGraphicsParticles); - QmlGraphicsItem::componentComplete(); - if (d->count) { - d->paintItem->updateSize(); - d->clock.start(); - } - if (d->lifeSpanDev > d->lifeSpan) - d->lifeSpanDev = d->lifeSpan; -} - -QT_END_NAMESPACE |