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| |
| #include "qquickage_p.h" |
| #include "qquickparticleemitter_p.h" |
| QT_BEGIN_NAMESPACE |
| /*! |
| \qmltype Age |
| \instantiates QQuickAgeAffector |
| \inqmlmodule QtQuick.Particles |
| \inherits Affector |
| \brief For altering particle ages. |
| \ingroup qtquick-particles |
| |
| The Age affector allows you to alter where the particle is in its lifecycle. Common uses |
| are to expire particles prematurely, possibly giving them time to animate out. |
| |
| The Age affector is also sometimes known as a 'Kill' affector, because with the default |
| parameters it will immediately expire all particles which it affects. |
| |
| The Age affector only applies to particles which are still alive. |
| */ |
| /*! |
| \qmlproperty int QtQuick.Particles::Age::lifeLeft |
| |
| The amount of life to set the particle to have. Affected particles |
| will advance to a point in their life where they will have this many |
| milliseconds left to live. |
| */ |
| |
| /*! |
| \qmlproperty bool QtQuick.Particles::Age::advancePosition |
| |
| advancePosition determines whether position, veclocity and acceleration are included in |
| the simulated aging done by the affector. If advancePosition is false, |
| then the position, velocity and acceleration will remain the same and only |
| other attributes (such as opacity) will advance in the simulation to where |
| it would normally be for that point in the particle's life. With advancePosition set to |
| true the position, velocity and acceleration will also advance to where it would |
| normally be by that point in the particle's life, making it advance its position |
| on screen. |
| |
| Default value is true. |
| */ |
| |
| QQuickAgeAffector::QQuickAgeAffector(QQuickItem *parent) : |
| QQuickParticleAffector(parent), m_lifeLeft(0), m_advancePosition(true) |
| { |
| } |
| |
| |
| bool QQuickAgeAffector::affectParticle(QQuickParticleData *d, qreal dt) |
| { |
| Q_UNUSED(dt); |
| if (d->stillAlive(m_system)){ |
| float curT = m_system->timeInt / 1000.0f; |
| float ttl = m_lifeLeft / 1000.0f; |
| if (!m_advancePosition && ttl > 0){ |
| float x = d->curX(m_system); |
| float vx = d->curVX(m_system); |
| float ax = d->curAX(); |
| float y = d->curY(m_system); |
| float vy = d->curVY(m_system); |
| float ay = d->curAY(); |
| d->t = curT - (d->lifeSpan - ttl); |
| d->setInstantaneousX(x, m_system); |
| d->setInstantaneousVX(vx, m_system); |
| d->setInstantaneousAX(ax, m_system); |
| d->setInstantaneousY(y, m_system); |
| d->setInstantaneousVY(vy, m_system); |
| d->setInstantaneousAY(ay, m_system); |
| } else { |
| d->t = curT - (d->lifeSpan - ttl); |
| } |
| return true; |
| } |
| return false; |
| } |
| QT_END_NAMESPACE |
| |
| #include "moc_qquickage_p.cpp" |