1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Declarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsgwander_p.h"
#include "qsgparticlesystem_p.h"//for ParticlesVertices
QT_BEGIN_NAMESPACE
QSGWanderAffector::QSGWanderAffector(QSGItem *parent) :
QSGParticleAffector(parent), m_xVariance(0), m_yVariance(0), m_pace(0)
, m_physics(Velocity)
{
m_needsReset = true;
}
QSGWanderAffector::~QSGWanderAffector()
{
for(QHash<int, WanderData*>::const_iterator iter=m_wanderData.constBegin();
iter != m_wanderData.constEnd(); iter++)
delete (*iter);
}
WanderData* QSGWanderAffector::getData(int idx)
{
if(m_wanderData.contains(idx))
return m_wanderData[idx];
WanderData* d = new WanderData;
d->x_vel = 0;
d->y_vel = 0;
d->x_peak = m_xVariance;
d->y_peak = m_yVariance;
d->x_var = m_pace * qreal(qrand()) / RAND_MAX;
d->y_var = m_pace * qreal(qrand()) / RAND_MAX;
m_wanderData.insert(idx, d);
return d;
}
void QSGWanderAffector::reset(int systemIdx)
{
if(m_wanderData.contains(systemIdx))
delete m_wanderData[systemIdx];
m_wanderData.remove(systemIdx);
}
bool QSGWanderAffector::affectParticle(QSGParticleData* data, qreal dt)
{
/*TODO: Add a mode which does basically this - picking a direction, going in it (random speed) and then going back
WanderData* d = getData(data->systemIndex);
if (m_xVariance != 0.) {
if ((d->x_vel > d->x_peak && d->x_var > 0.0) || (d->x_vel < -d->x_peak && d->x_var < 0.0)) {
d->x_var = -d->x_var;
d->x_peak = m_xVariance + m_xVariance * qreal(qrand()) / RAND_MAX;
}
d->x_vel += d->x_var * dt;
}
qreal dx = dt * d->x_vel;
if (m_yVariance != 0.) {
if ((d->y_vel > d->y_peak && d->y_var > 0.0) || (d->y_vel < -d->y_peak && d->y_var < 0.0)) {
d->y_var = -d->y_var;
d->y_peak = m_yVariance + m_yVariance * qreal(qrand()) / RAND_MAX;
}
d->y_vel += d->y_var * dt;
}
qreal dy = dt * d->x_vel;
//### Should we be amending vel instead?
ParticleVertex* p = &(data->pv);
p->x += dx;
p->y += dy;
return true;
*/
qreal dx = dt * m_pace * (2 * qreal(qrand())/RAND_MAX - 1);
qreal dy = dt * m_pace * (2 * qreal(qrand())/RAND_MAX - 1);
qreal newX, newY;
switch(m_physics){
case Position:
newX = data->curX() + dx;
if(m_xVariance > qAbs(newX) )
data->pv.x += dx;
newY = data->curY() + dy;
if(m_yVariance > qAbs(newY) )
data->pv.y += dy;
break;
default:
case Velocity:
newX = data->curSX() + dx;
if(m_xVariance > qAbs(newX) )
data->setInstantaneousSX(newX);
newY = data->curSY() + dy;
if(m_yVariance > qAbs(newY) )
data->setInstantaneousSY(newY);
break;
case Acceleration:
newX = data->pv.ax + dx;
if(m_xVariance > qAbs(newX) )
data->setInstantaneousAX(newX);
newY = data->pv.ay + dy;
if(m_yVariance > qAbs(newY) )
data->setInstantaneousAY(newY);
break;
}
return true;
}
QT_END_NAMESPACE
|
