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
|
#ifndef SCALE_H
#define SCALE_H
#include <algorithm>
class Scale
{
public:
Scale(float domainMin, float domainMax, float rangeMin, float rangeMax)
: m_domainMin(domainMin)
, m_domainMax(domainMax)
, m_rangeMin(rangeMin)
, m_rangeMax(rangeMax)
{
valuesUpdated();
}
virtual ~Scale() {}
void setRangeMin(float rangeMin) { m_rangeMin = rangeMin; valuesUpdated(); }
void setRangeMax(float rangeMax) { m_rangeMax = rangeMax; valuesUpdated(); }
void setDomainMin(float domainMin) { m_domainMin = domainMin; valuesUpdated(); }
void setDomainMax(float domainMax) { m_domainMax = domainMax; valuesUpdated(); }
void setRange(float rangeMin, float rangeMax)
{
m_rangeMin = rangeMin;
m_rangeMax = rangeMax;
valuesUpdated();
}
void setDomain(float domainMin, float domainMax)
{
m_domainMin = domainMin;
m_domainMax = domainMax;
valuesUpdated();
}
void inverse()
{
std::swap(m_rangeMin, m_domainMin);
std::swap(m_rangeMax, m_domainMax);
valuesUpdated();
}
virtual float operator()(float value) const = 0;
protected:
// Called when internal values change
virtual void valuesUpdated() {}
float m_domainMin, m_domainMax;
float m_rangeMin, m_rangeMax;
};
class LinearScale
: public Scale
{
public:
LinearScale(float domainMin, float domainMax, float rangeMin, float rangeMax)
: Scale(domainMin, domainMax, rangeMin, rangeMax)
{
valuesUpdated();
}
virtual float operator()(float value) const
{
return (value - m_domainMin) * m_transformSlope + m_rangeMin;
}
protected:
virtual void valuesUpdated()
{
m_transformSlope = (m_rangeMax - m_rangeMin) / (m_domainMax - m_domainMin);
}
private:
float m_transformSlope;
};
#endif // SCALE_H
|
