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| |
| #include "qquicktargetdirection_p.h" |
| #include "qquickparticleemitter_p.h" |
| #include <cmath> |
| #include <QDebug> |
| #include <QRandomGenerator> |
| |
| QT_BEGIN_NAMESPACE |
| /*! |
| \qmltype TargetDirection |
| \instantiates QQuickTargetDirection |
| \inqmlmodule QtQuick.Particles |
| \ingroup qtquick-particles |
| \inherits Direction |
| \brief For specifying a direction towards the target point. |
| |
| */ |
| /*! |
| \qmlproperty real QtQuick.Particles::TargetDirection::targetX |
| */ |
| /*! |
| \qmlproperty real QtQuick.Particles::TargetDirection::targetY |
| */ |
| /*! |
| \qmlproperty Item QtQuick.Particles::TargetDirection::targetItem |
| If specified, this will take precedence over targetX and targetY. |
| The targeted point will be the center of the specified Item |
| */ |
| /*! |
| \qmlproperty real QtQuick.Particles::TargetDirection::targetVariation |
| */ |
| /*! |
| \qmlproperty real QtQuick.Particles::TargetDirection::magnitude |
| */ |
| /*! |
| \qmlproperty real QtQuick.Particles::TargetDirection::magnitudeVariation |
| */ |
| /*! |
| \qmlproperty bool QtQuick.Particles::TargetDirection::proportionalMagnitude |
| |
| If true, then the value of magnitude and magnitudeVariation shall be interpreted as multiples |
| of the distance between the source point and the target point, per second. |
| |
| If false(default), then the value of magnitude and magnitudeVariation shall be interpreted as |
| pixels per second. |
| */ |
| |
| QQuickTargetDirection::QQuickTargetDirection(QObject *parent) : |
| QQuickDirection(parent) |
| , m_targetX(0) |
| , m_targetY(0) |
| , m_targetVariation(0) |
| , m_proportionalMagnitude(false) |
| , m_magnitude(0) |
| , m_magnitudeVariation(0) |
| , m_targetItem(nullptr) |
| { |
| } |
| |
| QPointF QQuickTargetDirection::sample(const QPointF &from) |
| { |
| //###This approach loses interpolating the last position of the target (like we could with the emitter) is it worthwhile? |
| QPointF ret; |
| qreal targetX; |
| qreal targetY; |
| if (m_targetItem){ |
| QQuickParticleEmitter* parentEmitter = qobject_cast<QQuickParticleEmitter*>(parent()); |
| targetX = m_targetItem->width()/2; |
| targetY = m_targetItem->height()/2; |
| if (!parentEmitter){ |
| qWarning() << "Directed vector is not a child of the emitter. Mapping of target item coordinates may fail."; |
| targetX += m_targetItem->x(); |
| targetY += m_targetItem->y(); |
| }else{ |
| ret = parentEmitter->mapFromItem(m_targetItem, QPointF(targetX, targetY)); |
| targetX = ret.x(); |
| targetY = ret.y(); |
| } |
| }else{ |
| targetX = m_targetX; |
| targetY = m_targetY; |
| } |
| targetX += 0 - from.x() - m_targetVariation + QRandomGenerator::global()->generateDouble() * m_targetVariation*2; |
| targetY += 0 - from.y() - m_targetVariation + QRandomGenerator::global()->generateDouble() * m_targetVariation*2; |
| qreal theta = std::atan2(targetY, targetX); |
| qreal mag = m_magnitude + QRandomGenerator::global()->generateDouble() * m_magnitudeVariation * 2 - m_magnitudeVariation; |
| if (m_proportionalMagnitude) |
| mag *= std::sqrt(targetX * targetX + targetY * targetY); |
| ret.setX(mag * std::cos(theta)); |
| ret.setY(mag * std::sin(theta)); |
| return ret; |
| } |
| |
| QT_END_NAMESPACE |
| |
| #include "moc_qquicktargetdirection_p.cpp" |