| 1 | // Copyright (C) 2021 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only |
| 3 | |
| 4 | #include "qquick3dparticlepointrotator_p.h" |
| 5 | |
| 6 | QT_BEGIN_NAMESPACE |
| 7 | |
| 8 | /*! |
| 9 | \qmltype PointRotator3D |
| 10 | \inherits Affector3D |
| 11 | \inqmlmodule QtQuick3D.Particles3D |
| 12 | \brief Rotates particles around a pivot point. |
| 13 | \since 6.2 |
| 14 | |
| 15 | This element rotates particles around a \l pivotPoint towards the \l direction. |
| 16 | */ |
| 17 | |
| 18 | QQuick3DParticlePointRotator::QQuick3DParticlePointRotator(QQuick3DNode *parent) |
| 19 | : QQuick3DParticleAffector(parent) |
| 20 | { |
| 21 | } |
| 22 | |
| 23 | /*! |
| 24 | \qmlproperty real PointRotator3D::magnitude |
| 25 | |
| 26 | This property defines the magnitude in degrees per second. Negative magnitude |
| 27 | rotates to the opposite way from the \l {PointRotator3D::direction}{direction}. |
| 28 | |
| 29 | The default value is \c 10.0. |
| 30 | */ |
| 31 | float QQuick3DParticlePointRotator::magnitude() const |
| 32 | { |
| 33 | return m_magnitude; |
| 34 | } |
| 35 | |
| 36 | void QQuick3DParticlePointRotator::setMagnitude(float magnitude) |
| 37 | { |
| 38 | if (qFuzzyCompare(p1: m_magnitude, p2: magnitude)) |
| 39 | return; |
| 40 | |
| 41 | m_magnitude = magnitude; |
| 42 | Q_EMIT magnitudeChanged(); |
| 43 | Q_EMIT update(); |
| 44 | } |
| 45 | |
| 46 | /*! |
| 47 | \qmlproperty vector3d PointRotator3D::direction |
| 48 | |
| 49 | This property defines the direction for the rotation. Values will be |
| 50 | automatically normalized to a unit vector. |
| 51 | |
| 52 | The default value is \c (0.0, 1.0, 0.0) (around the y-coordinate). |
| 53 | */ |
| 54 | QVector3D QQuick3DParticlePointRotator::direction() const |
| 55 | { |
| 56 | return m_direction; |
| 57 | } |
| 58 | |
| 59 | void QQuick3DParticlePointRotator::setDirection(const QVector3D &direction) |
| 60 | { |
| 61 | if (m_direction == direction) |
| 62 | return; |
| 63 | |
| 64 | m_direction = direction; |
| 65 | m_directionNormalized = m_direction.normalized(); |
| 66 | Q_EMIT directionChanged(); |
| 67 | Q_EMIT update(); |
| 68 | } |
| 69 | |
| 70 | /*! |
| 71 | \qmlproperty vector3d PointRotator3D::pivotPoint |
| 72 | |
| 73 | This property defines the pivot point for the rotation. Particles are rotated |
| 74 | around this point. |
| 75 | |
| 76 | The default value is \c (0, 0, 0) (the center of particle system). |
| 77 | */ |
| 78 | QVector3D QQuick3DParticlePointRotator::pivotPoint() const |
| 79 | { |
| 80 | return m_pivotPoint; |
| 81 | } |
| 82 | |
| 83 | void QQuick3DParticlePointRotator::setPivotPoint(const QVector3D &point) |
| 84 | { |
| 85 | if (m_pivotPoint == point) |
| 86 | return; |
| 87 | |
| 88 | m_pivotPoint = point; |
| 89 | Q_EMIT pivotPointChanged(); |
| 90 | Q_EMIT update(); |
| 91 | } |
| 92 | |
| 93 | void QQuick3DParticlePointRotator::prepareToAffect() |
| 94 | { |
| 95 | m_rotationMatrix.setToIdentity(); |
| 96 | m_rotationMatrix.translate(vector: m_pivotPoint); |
| 97 | } |
| 98 | |
| 99 | void QQuick3DParticlePointRotator::affectParticle(const QQuick3DParticleData &sd, QQuick3DParticleDataCurrent *d, float time) |
| 100 | { |
| 101 | // Rotate based on the current position |
| 102 | // Note that this means order of PointRotator element compared to other affectors matters |
| 103 | Q_UNUSED(sd); |
| 104 | if (!qFuzzyIsNull(f: m_magnitude)) { |
| 105 | QMatrix4x4 rot = m_rotationMatrix; |
| 106 | rot.rotate(angle: time * m_magnitude, vector: m_directionNormalized); |
| 107 | rot.translate(vector: -m_pivotPoint); |
| 108 | d->position = rot.map(point: d->position); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | QT_END_NAMESPACE |
| 113 |