signaldata.cpp
2.62 KB
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
#include "signaldata.h"
#include <qvector.h>
#include <qmutex.h>
#include <qreadwritelock.h>
class SignalData::PrivateData
{
public:
PrivateData():
boundingRect(1.0, 1.0, -2.0, -2.0) // invalid
{
values.reserve(1000);
}
inline void append(const QPointF &sample)
{
values.append(sample);
// adjust the bounding rectangle
if ( boundingRect.width() < 0 || boundingRect.height() < 0 )
{
boundingRect.setRect(sample.x(), sample.y(), 0.0, 0.0);
}
else
{
boundingRect.setRight(sample.x());
if ( sample.y() > boundingRect.bottom() )
boundingRect.setBottom(sample.y());
if ( sample.y() < boundingRect.top() )
boundingRect.setTop(sample.y());
}
}
QReadWriteLock lock;
QVector<QPointF> values;
QRectF boundingRect;
QMutex mutex; // protecting pendingValues
QVector<QPointF> pendingValues;
};
SignalData::SignalData()
{
d_data = new PrivateData();
}
SignalData::~SignalData()
{
delete d_data;
}
int SignalData::size() const
{
return d_data->values.size();
}
QPointF SignalData::value(int index) const
{
return d_data->values[index];
}
QRectF SignalData::boundingRect() const
{
return d_data->boundingRect;
}
void SignalData::lock()
{
d_data->lock.lockForRead();
}
void SignalData::unlock()
{
d_data->lock.unlock();
}
void SignalData::append(const QPointF &sample)
{
d_data->mutex.lock();
d_data->pendingValues += sample;
const bool isLocked = d_data->lock.tryLockForWrite();
if ( isLocked )
{
const int numValues = d_data->pendingValues.size();
const QPointF *pendingValues = d_data->pendingValues.data();
for ( int i = 0; i < numValues; i++ )
d_data->append(pendingValues[i]);
d_data->pendingValues.clear();
d_data->lock.unlock();
}
d_data->mutex.unlock();
}
void SignalData::clearStaleValues(double limit)
{
d_data->lock.lockForWrite();
d_data->boundingRect = QRectF(1.0, 1.0, -2.0, -2.0); // invalid
const QVector<QPointF> values = d_data->values;
d_data->values.clear();
d_data->values.reserve(values.size());
int index;
for ( index = values.size() - 1; index >= 0; index-- )
{
if ( values[index].x() < limit )
break;
}
if ( index > 0 )
d_data->append(values[index++]);
while ( index < values.size() - 1 )
d_data->append(values[index++]);
d_data->lock.unlock();
}
SignalData &SignalData::instance()
{
static SignalData valueVector;
return valueVector;
}