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| |
| #include <QtQml/qqmlinfo.h> |
| #include "qquickgravity_p.h" |
| #include <cmath> |
| QT_BEGIN_NAMESPACE |
| const qreal CONV = 0.017453292520444443; |
| /*! |
| \qmltype Gravity |
| \instantiates QQuickGravityAffector |
| \inqmlmodule QtQuick.Particles |
| \ingroup qtquick-particles |
| \inherits Affector |
| \brief For applying acceleration in an angle. |
| |
| This element will accelerate all affected particles to a vector of |
| the specified magnitude in the specified angle. If the angle and acceleration do |
| not vary, it is more efficient to set the specified acceleration on the Emitter. |
| |
| This element models the gravity of a massive object whose center of |
| gravity is far away (and thus the gravitational pull is effectively constant |
| across the scene). To model the gravity of an object near or inside the scene, |
| use PointAttractor. |
| */ |
| |
| /*! |
| \qmlproperty real QtQuick.Particles::Gravity::magnitude |
| |
| Pixels per second that objects will be accelerated by. |
| */ |
| void QQuickGravityAffector::setMagnitude(qreal arg) |
| { |
| if (m_magnitude != arg) { |
| m_magnitude = arg; |
| m_needRecalc = true; |
| emit magnitudeChanged(arg); |
| } |
| } |
| |
| qreal QQuickGravityAffector::magnitude() const |
| { |
| return m_magnitude; |
| } |
| |
| |
| /*! |
| \qmlproperty real QtQuick.Particles::Gravity::acceleration |
| \deprecated |
| |
| \warning The name for this property has changed to magnitude, use it instead. |
| */ |
| void QQuickGravityAffector::setAcceleration(qreal arg) |
| { |
| qmlWarning(this) << "The acceleration property is deprecated. Please use magnitude instead."; |
| setMagnitude(arg); |
| } |
| |
| /*! |
| \qmlproperty real QtQuick.Particles::Gravity::angle |
| |
| Angle of acceleration. |
| */ |
| void QQuickGravityAffector::setAngle(qreal arg) |
| { |
| if (m_angle != arg) { |
| m_angle = arg; |
| m_needRecalc = true; |
| emit angleChanged(arg); |
| } |
| } |
| |
| qreal QQuickGravityAffector::angle() const |
| { |
| return m_angle; |
| } |
| |
| QQuickGravityAffector::QQuickGravityAffector(QQuickItem *parent) : |
| QQuickParticleAffector(parent), m_magnitude(-10), m_angle(90), m_needRecalc(true) |
| { |
| } |
| |
| bool QQuickGravityAffector::affectParticle(QQuickParticleData *d, qreal dt) |
| { |
| if (!m_magnitude) |
| return false; |
| if (m_needRecalc) { |
| m_needRecalc = false; |
| m_dx = m_magnitude * std::cos(m_angle * CONV); |
| m_dy = m_magnitude * std::sin(m_angle * CONV); |
| } |
| |
| d->setInstantaneousVX(d->curVX(m_system) + m_dx*dt, m_system); |
| d->setInstantaneousVY(d->curVY(m_system) + m_dy*dt, m_system); |
| return true; |
| } |
| |
| |
| |
| QT_END_NAMESPACE |
| |
| #include "moc_qquickgravity_p.cpp" |