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