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39
40#ifndef TURBULENCEAFFECTOR_H
41#define TURBULENCEAFFECTOR_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53#include "qquickparticleaffector_p.h"
54#include <QQmlListProperty>
55
56QT_BEGIN_NAMESPACE
57
58class QQuickParticlePainter;
59
60class QQuickTurbulenceAffector : public QQuickParticleAffector
61{
62 Q_OBJECT
63 Q_PROPERTY(qreal strength READ strength WRITE setStrength NOTIFY strengthChanged)
64 Q_PROPERTY(QUrl noiseSource READ noiseSource WRITE setNoiseSource NOTIFY noiseSourceChanged)
65 QML_NAMED_ELEMENT(Turbulence)
66
67public:
68 explicit QQuickTurbulenceAffector(QQuickItem *parent = 0);
69 ~QQuickTurbulenceAffector();
70 void affectSystem(qreal dt) override;
71
72 qreal strength() const
73 {
74 return m_strength;
75 }
76
77 QUrl noiseSource() const
78 {
79 return m_noiseSource;
80 }
81Q_SIGNALS:
82
83 void strengthChanged(qreal arg);
84
85 void noiseSourceChanged(QUrl arg);
86
87public Q_SLOTS:
88
89 void setStrength(qreal arg)
90 {
91 if (m_strength != arg) {
92 m_strength = arg;
93 Q_EMIT strengthChanged(arg);
94 }
95 }
96
97 void setNoiseSource(QUrl arg)
98 {
99 if (m_noiseSource != arg) {
100 m_noiseSource = arg;
101 Q_EMIT noiseSourceChanged(arg);
102 initializeGrid();
103 }
104 }
105
106protected:
107 void geometryChanged(const QRectF &newGeometry,
108 const QRectF &oldGeometry) override;
109private:
110 void ensureInit();
111 void mapUpdate();
112 void initializeGrid();
113 qreal boundsRespectingField(int x, int y);
114 qreal m_strength;
115 qreal m_lastT;
116 int m_gridSize;
117 qreal** m_field;
118 QPointF** m_vectorField;
119 bool m_inited;
120 QUrl m_noiseSource;
121};
122
123QT_END_NAMESPACE
124#endif // TURBULENCEAFFECTOR_H
125

source code of qtdeclarative/src/particles/qquickturbulence_p.h