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39
40#include "qquickangledirection_p.h"
41#include <QRandomGenerator>
42#include <qmath.h>
43
44QT_BEGIN_NAMESPACE
45const qreal CONV = 0.017453292519943295;
46/*!
47 \qmltype AngleDirection
48 \instantiates QQuickAngleDirection
49 \inqmlmodule QtQuick.Particles
50 \ingroup qtquick-particles
51 \inherits Direction
52 \brief For specifying a direction that varies in angle.
53
54 The AngledDirection element allows both the specification of a direction by angle and magnitude,
55 as well as varying the parameters by angle or magnitude.
56*/
57/*!
58 \qmlproperty real QtQuick.Particles::AngleDirection::angle
59 This property specifies the base angle for the direction.
60 The angle of this direction will vary by no more than angleVariation
61 from this angle.
62
63 Angle is specified by degrees clockwise from straight right.
64
65 The default value is zero.
66*/
67/*!
68 \qmlproperty real QtQuick.Particles::AngleDirection::magnitude
69 This property specifies the base magnitude for the direction.
70 The magnitude of this direction will vary by no more than magnitudeVariation
71 from this magnitude.
72
73 Magnitude is specified in units of pixels per second.
74
75 The default value is zero.
76*/
77/*!
78 \qmlproperty real QtQuick.Particles::AngleDirection::angleVariation
79 This property specifies the maximum angle variation for the direction.
80 The angle of the direction will vary by up to angleVariation clockwise
81 and anticlockwise from the value specified in angle.
82
83 Angle is specified by degrees clockwise from straight right.
84
85 The default value is zero.
86*/
87/*!
88 \qmlproperty real QtQuick.Particles::AngleDirection::magnitudeVariation
89 This property specifies the base magnitude for the direction.
90 The magnitude of this direction will vary by no more than magnitudeVariation
91 from the base magnitude.
92
93 Magnitude is specified in units of pixels per second.
94
95 The default value is zero.
96*/
97QQuickAngleDirection::QQuickAngleDirection(QObject *parent) :
98 QQuickDirection(parent)
99 , m_angle(0)
100 , m_magnitude(0)
101 , m_angleVariation(0)
102 , m_magnitudeVariation(0)
103{
104
105}
106
107QPointF QQuickAngleDirection::sample(const QPointF &from)
108{
109 Q_UNUSED(from);
110 QPointF ret;
111 qreal theta = m_angle*CONV - m_angleVariation*CONV + QRandomGenerator::global()->generateDouble() * m_angleVariation*CONV * 2;
112 qreal mag = m_magnitude- m_magnitudeVariation + QRandomGenerator::global()->generateDouble() * m_magnitudeVariation * 2;
113 ret.setX(mag * qCos(v: theta));
114 ret.setY(mag * qSin(v: theta));
115 return ret;
116}
117
118QT_END_NAMESPACE
119
120#include "moc_qquickangledirection_p.cpp"
121

source code of qtdeclarative/src/particles/qquickangledirection.cpp