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| |
| #include "qquickcustomaffector_p.h" |
| #include <private/qqmlengine_p.h> |
| #include <private/qqmlglobal_p.h> |
| #include <private/qjsvalue_p.h> |
| #include <QQmlEngine> |
| #include <QDebug> |
| QT_BEGIN_NAMESPACE |
| |
| //TODO: Move docs (and inheritence) to real base when docs can propagate. Currently this pretends to be the base class! |
| /*! |
| \qmlsignal QtQuick.Particles::Affector::affectParticles(Array particles, real dt) |
| |
| This signal is emitted when particles are selected to be affected. particles contains |
| an array of particle objects which can be directly manipulated. |
| |
| dt is the time since the last time it was affected. Use dt to normalize |
| trajectory manipulations to real time. |
| |
| Note that JavaScript is slower to execute, so it is not recommended to use this in |
| high-volume particle systems. |
| |
| The corresponding handler is \c onAffectParticles. |
| */ |
| |
| /*! |
| \qmlproperty StochasticDirection QtQuick.Particles::Affector::position |
| |
| Affected particles will have their position set to this direction, |
| relative to the ParticleSystem. When interpreting directions as points, |
| imagine it as an arrow with the base at the 0,0 of the ParticleSystem and the |
| tip at where the specified position will be. |
| */ |
| |
| /*! |
| \qmlproperty StochasticDirection QtQuick.Particles::Affector::velocity |
| |
| Affected particles will have their velocity set to this direction. |
| */ |
| |
| |
| /*! |
| \qmlproperty StochasticDirection QtQuick.Particles::Affector::acceleration |
| |
| Affected particles will have their acceleration set to this direction. |
| */ |
| |
| |
| /*! |
| \qmlproperty bool QtQuick.Particles::Affector::relative |
| |
| Whether the affected particles have their existing position/velocity/acceleration added |
| to the new one. |
| |
| Default is true. |
| */ |
| QQuickCustomAffector::QQuickCustomAffector(QQuickItem *parent) : |
| QQuickParticleAffector(parent) |
| , m_position(&m_nullVector) |
| , m_velocity(&m_nullVector) |
| , m_acceleration(&m_nullVector) |
| , m_relative(true) |
| { |
| } |
| |
| bool QQuickCustomAffector::isAffectConnected() |
| { |
| IS_SIGNAL_CONNECTED(this, QQuickCustomAffector, affectParticles, (const QJSValue &, qreal)); |
| } |
| |
| void QQuickCustomAffector::affectSystem(qreal dt) |
| { |
| //Acts a bit differently, just emits affected for everyone it might affect, when the only thing is connecting to affected(x,y) |
| bool justAffected = (m_acceleration == &m_nullVector |
| && m_velocity == &m_nullVector |
| && m_position == &m_nullVector |
| && isAffectedConnected()); |
| if (!isAffectConnected() && !justAffected) { |
| QQuickParticleAffector::affectSystem(dt); |
| return; |
| } |
| if (!m_enabled) |
| return; |
| updateOffsets(); |
| |
| QList<QQuickParticleData*> toAffect; |
| foreach (QQuickParticleGroupData* gd, m_system->groupData) { |
| if (activeGroup(gd->index)) { |
| foreach (QQuickParticleData* d, gd->data) { |
| if (shouldAffect(d)) { |
| toAffect << d; |
| } |
| } |
| } |
| } |
| |
| if (toAffect.isEmpty()) |
| return; |
| |
| if (justAffected) { |
| foreach (QQuickParticleData* d, toAffect) {//Not postAffect to avoid saying the particle changed |
| if (m_onceOff) |
| m_onceOffed << qMakePair(d->groupId, d->index); |
| emit affected(d->curX(m_system), d->curY(m_system)); |
| } |
| return; |
| } |
| |
| if (m_onceOff) |
| dt = 1.0; |
| |
| QQmlEngine *qmlEngine = ::qmlEngine(this); |
| QV4::ExecutionEngine *v4 = qmlEngine->handle(); |
| |
| QV4::Scope scope(v4); |
| QV4::ScopedArrayObject array(scope, v4->newArrayObject(toAffect.size())); |
| QV4::ScopedValue v(scope); |
| for (int i=0; i<toAffect.size(); i++) |
| array->put(i, (v = toAffect[i]->v4Value(m_system))); |
| |
| const auto doAffect = [&](qreal dt) { |
| affectProperties(toAffect, dt); |
| QJSValue particles; |
| QJSValuePrivate::setValue(&particles, v4, array); |
| emit affectParticles(particles, dt); |
| }; |
| |
| if (dt >= simulationCutoff || dt <= simulationDelta) { |
| doAffect(dt); |
| } else { |
| int realTime = m_system->timeInt; |
| m_system->timeInt -= dt * 1000.0; |
| while (dt > simulationDelta) { |
| m_system->timeInt += simulationDelta * 1000.0; |
| dt -= simulationDelta; |
| doAffect(simulationDelta); |
| } |
| m_system->timeInt = realTime; |
| if (dt > 0.0) |
| doAffect(dt); |
| } |
| |
| foreach (QQuickParticleData* d, toAffect) |
| if (d->update == 1.0) |
| postAffect(d); |
| } |
| |
| bool QQuickCustomAffector::affectParticle(QQuickParticleData *d, qreal dt) |
| { |
| //This does the property based affecting, called by superclass if signal isn't hooked up. |
| bool changed = false; |
| QPointF curPos(d->curX(m_system), d->curY(m_system)); |
| |
| if (m_acceleration != &m_nullVector){ |
| QPointF pos = m_acceleration->sample(curPos); |
| QPointF curAcc = QPointF(d->curAX(), d->curAY()); |
| if (m_relative) { |
| pos *= dt; |
| pos += curAcc; |
| } |
| if (pos != curAcc) { |
| d->setInstantaneousAX(pos.x(), m_system); |
| d->setInstantaneousAY(pos.y(), m_system); |
| changed = true; |
| } |
| } |
| |
| if (m_velocity != &m_nullVector){ |
| QPointF pos = m_velocity->sample(curPos); |
| QPointF curVel = QPointF(d->curVX(m_system), d->curVY(m_system)); |
| if (m_relative) { |
| pos *= dt; |
| pos += curVel; |
| } |
| if (pos != curVel) { |
| d->setInstantaneousVX(pos.x(), m_system); |
| d->setInstantaneousVY(pos.y(), m_system); |
| changed = true; |
| } |
| } |
| |
| if (m_position != &m_nullVector){ |
| QPointF pos = m_position->sample(curPos); |
| if (m_relative) { |
| pos *= dt; |
| pos += curPos; |
| } |
| if (pos != curPos) { |
| d->setInstantaneousX(pos.x(), m_system); |
| d->setInstantaneousY(pos.y(), m_system); |
| changed = true; |
| } |
| } |
| |
| return changed; |
| } |
| |
| void QQuickCustomAffector::affectProperties(const QList<QQuickParticleData*> &particles, qreal dt) |
| { |
| foreach (QQuickParticleData* d, particles) |
| if ( affectParticle(d, dt) ) |
| d->update = 1.0; |
| } |
| |
| QT_END_NAMESPACE |
| |
| #include "moc_qquickcustomaffector_p.cpp" |
