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39 
40 #ifndef WANDERAFFECTOR_H
41 #define WANDERAFFECTOR_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 <QHash>
54 #include "qquickparticleaffector_p.h"
55 
56 QT_BEGIN_NAMESPACE
57 
58 struct WanderData{
59     qreal x_vel;
60     qreal y_vel;
61     qreal x_peak;
62     qreal x_var;
63     qreal y_peak;
64     qreal y_var;
65 };
66 
67 class QQuickWanderAffector : public QQuickParticleAffector
68 {
69     Q_OBJECT
70     Q_PROPERTY(qreal pace READ pace WRITE setPace NOTIFY paceChanged)
71     Q_PROPERTY(qreal xVariance READ xVariance WRITE setXVariance NOTIFY xVarianceChanged)
72     Q_PROPERTY(qreal yVariance READ yVariance WRITE setYVariance NOTIFY yVarianceChanged)
73     Q_PROPERTY(AffectableParameters affectedParameter READ affectedParameter WRITE setAffectedParameter NOTIFY affectedParameterChanged)
74     QML_NAMED_ELEMENT(Wander)
75 
76 public:
77     enum AffectableParameters {
78         Position,
79         Velocity,
80         Acceleration
81     };
82     Q_ENUM(AffectableParameters)
83 
84     explicit QQuickWanderAffector(QQuickItem *parent = 0);
85     ~QQuickWanderAffector();
86 //    virtual void reset(int systemIdx);
87 
xVariance()88     qreal xVariance() const
89     {
90         return m_xVariance;
91     }
92 
yVariance()93     qreal yVariance() const
94     {
95         return m_yVariance;
96     }
97 
pace()98     qreal pace() const
99     {
100         return m_pace;
101     }
102 
affectedParameter()103     AffectableParameters affectedParameter() const
104     {
105         return m_affectedParameter;
106     }
107 
108 protected:
109     bool affectParticle(QQuickParticleData *d, qreal dt) override;
110 
111 Q_SIGNALS:
112 
113     void xVarianceChanged(qreal arg);
114 
115     void yVarianceChanged(qreal arg);
116 
117     void paceChanged(qreal arg);
118 
119 
120     void affectedParameterChanged(AffectableParameters arg);
121 
122 public Q_SLOTS:
setXVariance(qreal arg)123 void setXVariance(qreal arg)
124 {
125     if (m_xVariance != arg) {
126         m_xVariance = arg;
127         Q_EMIT xVarianceChanged(arg);
128     }
129 }
130 
setYVariance(qreal arg)131 void setYVariance(qreal arg)
132 {
133     if (m_yVariance != arg) {
134         m_yVariance = arg;
135         Q_EMIT yVarianceChanged(arg);
136     }
137 }
138 
setPace(qreal arg)139 void setPace(qreal arg)
140 {
141     if (m_pace != arg) {
142         m_pace = arg;
143         Q_EMIT paceChanged(arg);
144     }
145 }
146 
147 
setAffectedParameter(AffectableParameters arg)148 void setAffectedParameter(AffectableParameters arg)
149 {
150     if (m_affectedParameter != arg) {
151         m_affectedParameter = arg;
152         Q_EMIT affectedParameterChanged(arg);
153     }
154 }
155 
156 private:
157     WanderData* getData(int idx);
158     QHash<int, WanderData*> m_wanderData;
159     qreal m_xVariance;
160     qreal m_yVariance;
161     qreal m_pace;
162     AffectableParameters m_affectedParameter;
163 };
164 
165 QT_END_NAMESPACE
166 #endif // WANDERAFFECTOR_H
167