1 /****************************************************************************
2 **
3 ** Copyright (C) 2016 The Qt Company Ltd.
4 ** Contact: https://www.qt.io/licensing/
5 **
6 ** This file is part of the QtQuick module of the Qt Toolkit.
7 **
8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** Commercial License Usage
10 ** Licensees holding valid commercial Qt licenses may use this file in
11 ** accordance with the commercial license agreement provided with the
12 ** Software or, alternatively, in accordance with the terms contained in
13 ** a written agreement between you and The Qt Company. For licensing terms
14 ** and conditions see https://www.qt.io/terms-conditions. For further
15 ** information use the contact form at https://www.qt.io/contact-us.
16 **
17 ** GNU Lesser General Public License Usage
18 ** Alternatively, this file may be used under the terms of the GNU Lesser
19 ** General Public License version 3 as published by the Free Software
20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the
21 ** packaging of this file. Please review the following information to
22 ** ensure the GNU Lesser General Public License version 3 requirements
23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24 **
25 ** GNU General Public License Usage
26 ** Alternatively, this file may be used under the terms of the GNU
27 ** General Public License version 2.0 or (at your option) the GNU General
28 ** Public license version 3 or any later version approved by the KDE Free
29 ** Qt Foundation. The licenses are as published by the Free Software
30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31 ** included in the packaging of this file. Please review the following
32 ** information to ensure the GNU General Public License requirements will
33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34 ** https://www.gnu.org/licenses/gpl-3.0.html.
35 **
36 ** $QT_END_LICENSE$
37 **
38 ****************************************************************************/
39 
40 #ifndef CUSTOMAFFECTOR_H
41 #define CUSTOMAFFECTOR_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 
54 #include <QObject>
55 #include <QtQml/qqml.h>
56 #include "qquickparticlesystem_p.h"
57 #include "qquickparticleextruder_p.h"
58 #include "qquickparticleaffector_p.h"
59 #include "qquickdirection_p.h"
60 
61 QT_BEGIN_NAMESPACE
62 
63 class QQuickCustomAffector : public QQuickParticleAffector
64 {
65     Q_OBJECT
66     Q_PROPERTY(bool relative READ relative WRITE setRelative NOTIFY relativeChanged)
67     Q_PROPERTY(QQuickDirection *position READ position WRITE setPosition NOTIFY positionChanged RESET positionReset)
68     Q_PROPERTY(QQuickDirection *velocity READ velocity WRITE setVelocity NOTIFY velocityChanged RESET velocityReset)
69     Q_PROPERTY(QQuickDirection *acceleration READ acceleration WRITE setAcceleration NOTIFY accelerationChanged RESET accelerationReset)
70     QML_NAMED_ELEMENT(Affector)
71 
72 public:
73     explicit QQuickCustomAffector(QQuickItem *parent = 0);
74     void affectSystem(qreal dt) override;
75 
position()76     QQuickDirection * position() const
77     {
78         return m_position;
79     }
80 
velocity()81     QQuickDirection * velocity() const
82     {
83         return m_velocity;
84     }
85 
acceleration()86     QQuickDirection * acceleration() const
87     {
88         return m_acceleration;
89     }
90 
positionReset()91     void positionReset()
92     {
93         m_position = &m_nullVector;
94     }
95 
velocityReset()96     void velocityReset()
97     {
98         m_velocity = &m_nullVector;
99     }
100 
accelerationReset()101     void accelerationReset()
102     {
103         m_acceleration = &m_nullVector;
104     }
105 
relative()106     bool relative() const
107     {
108         return m_relative;
109     }
110 
111 
112 Q_SIGNALS:
113     void affectParticles(const QJSValue &particles, qreal dt);
114 
115     void positionChanged(QQuickDirection * arg);
116 
117     void velocityChanged(QQuickDirection * arg);
118 
119     void accelerationChanged(QQuickDirection * arg);
120 
121     void relativeChanged(bool arg);
122 
123 public Q_SLOTS:
setPosition(QQuickDirection * arg)124     void setPosition(QQuickDirection * arg)
125     {
126         if (m_position != arg) {
127             m_position = arg;
128             Q_EMIT positionChanged(arg);
129         }
130     }
131 
setVelocity(QQuickDirection * arg)132     void setVelocity(QQuickDirection * arg)
133     {
134         if (m_velocity != arg) {
135             m_velocity = arg;
136             Q_EMIT velocityChanged(arg);
137         }
138     }
139 
setAcceleration(QQuickDirection * arg)140     void setAcceleration(QQuickDirection * arg)
141     {
142         if (m_acceleration != arg) {
143             m_acceleration = arg;
144             Q_EMIT accelerationChanged(arg);
145         }
146     }
147 
setRelative(bool arg)148     void setRelative(bool arg)
149     {
150         if (m_relative != arg) {
151             m_relative = arg;
152             Q_EMIT relativeChanged(arg);
153         }
154     }
155 
156 protected:
157     bool isAffectConnected();
158     bool affectParticle(QQuickParticleData *d, qreal dt) override;
159 
160 private:
161     void affectProperties(const QList<QQuickParticleData*> &particles, qreal dt);
162     QQuickDirection * m_position;
163     QQuickDirection * m_velocity;
164     QQuickDirection * m_acceleration;
165 
166     QQuickDirection m_nullVector;
167     bool m_relative;
168 };
169 
170 QT_END_NAMESPACE
171 #endif // CUSTOMAFFECTOR_H
172