| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #include "qquickangledirection_p.h" |
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| 5 | #include <QRandomGenerator> |
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| 6 | #include <qmath.h> |
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| 7 | |
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| 8 | QT_BEGIN_NAMESPACE |
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| 9 | const qreal CONV = 0.017453292519943295; |
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| 10 | /*! |
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| 11 | \qmltype AngleDirection |
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| 12 | \instantiates QQuickAngleDirection |
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| 13 | \inqmlmodule QtQuick.Particles |
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| 14 | \ingroup qtquick-particles |
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| 15 | \inherits Direction |
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| 16 | \brief For specifying a direction that varies in angle. |
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| 17 | |
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| 18 | The AngledDirection element allows both the specification of a direction by angle and magnitude, |
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| 19 | as well as varying the parameters by angle or magnitude. |
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| 20 | */ |
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| 21 | /*! |
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| 22 | \qmlproperty real QtQuick.Particles::AngleDirection::angle |
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| 23 | This property specifies the base angle for the direction. |
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| 24 | The angle of this direction will vary by no more than angleVariation |
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| 25 | from this angle. |
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| 26 | |
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| 27 | Angle is specified by degrees clockwise from straight right. |
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| 28 | |
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| 29 | The default value is zero. |
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| 30 | */ |
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| 31 | /*! |
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| 32 | \qmlproperty real QtQuick.Particles::AngleDirection::magnitude |
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| 33 | This property specifies the base magnitude for the direction. |
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| 34 | The magnitude of this direction will vary by no more than magnitudeVariation |
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| 35 | from this magnitude. |
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| 36 | |
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| 37 | Magnitude is specified in units of pixels per second. |
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| 38 | |
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| 39 | The default value is zero. |
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| 40 | */ |
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| 41 | /*! |
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| 42 | \qmlproperty real QtQuick.Particles::AngleDirection::angleVariation |
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| 43 | This property specifies the maximum angle variation for the direction. |
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| 44 | The angle of the direction will vary by up to angleVariation clockwise |
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| 45 | and anticlockwise from the value specified in angle. |
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| 46 | |
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| 47 | Angle is specified by degrees clockwise from straight right. |
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| 48 | |
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| 49 | The default value is zero. |
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| 50 | */ |
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| 51 | /*! |
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| 52 | \qmlproperty real QtQuick.Particles::AngleDirection::magnitudeVariation |
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| 53 | This property specifies the base magnitude for the direction. |
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| 54 | The magnitude of this direction will vary by no more than magnitudeVariation |
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| 55 | from the base magnitude. |
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| 56 | |
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| 57 | Magnitude is specified in units of pixels per second. |
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| 58 | |
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| 59 | The default value is zero. |
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| 60 | */ |
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| 61 | QQuickAngleDirection::QQuickAngleDirection(QObject *parent) : |
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| 62 | QQuickDirection(parent) |
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| 63 | , m_angle(0) |
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| 64 | , m_magnitude(0) |
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| 65 | , m_angleVariation(0) |
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| 66 | , m_magnitudeVariation(0) |
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| 67 | { |
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| 68 | |
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| 69 | } |
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| 70 | |
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| 71 | QPointF QQuickAngleDirection::sample(const QPointF &from) |
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| 72 | { |
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| 73 | Q_UNUSED(from); |
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| 74 | QPointF ret; |
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| 75 | qreal theta = m_angle*CONV - m_angleVariation*CONV + QRandomGenerator::global()->generateDouble() * m_angleVariation*CONV * 2; |
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| 76 | qreal mag = m_magnitude- m_magnitudeVariation + QRandomGenerator::global()->generateDouble() * m_magnitudeVariation * 2; |
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| 77 | ret.setX(mag * qCos(v: theta)); |
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| 78 | ret.setY(mag * qSin(v: theta)); |
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| 79 | return ret; |
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| 80 | } |
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| 81 | |
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| 82 | QT_END_NAMESPACE |
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| 83 | |
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| 84 | #include "moc_qquickangledirection_p.cpp" |
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| 85 | |
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