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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#include "qwt_scale_map.h"
QT_STATIC_CONST_IMPL double QwtScaleMap::LogMin = 1.0e-150;
QT_STATIC_CONST_IMPL double QwtScaleMap::LogMax = 1.0e150;
//! Constructor for a linear transformation
QwtScaleTransformation::QwtScaleTransformation(Type type):
d_type(type)
{
}
QwtScaleTransformation::~QwtScaleTransformation()
{
}
QwtScaleTransformation *QwtScaleTransformation::copy() const
{
return new QwtScaleTransformation(d_type);
}
/*!
\brief Transform a value between 2 linear intervals
\param x value related to the interval [x1, x2]
\param x1 first border of source interval
\param x2 first border of source interval
\param y1 first border of target interval
\param y2 first border of target interval
\return
<dl>
<dt>linear mapping:<dd>y1 + (y2 - y1) / (x2 - x1) * (x - x1)</dd>
</dl>
<dl>
<dt>log10 mapping: <dd>p1 + (p2 - p1) / log(s2 / s1) * log(x / s1)</dd>
</dl>
*/
double QwtScaleTransformation::xForm(
double s, double s1, double s2, double p1, double p2) const
{
if ( d_type == Log10 )
return p1 + (p2 - p1) / log(s2 / s1) * log(s / s1);
else
return p1 + (p2 - p1) / (s2 - s1) * (s - s1);
}
/*!
\brief Transform a value from a linear to a logarithmic interval
\param x value related to the linear interval [p1, p2]
\param p1 first border of linear interval
\param p2 first border of linear interval
\param s1 first border of logarithmic interval
\param s2 first border of logarithmic interval
\return
<dl>
<dt>exp((x - p1) / (p2 - p1) * log(s2 / s1)) * s1;
</dl>
*/
double QwtScaleTransformation::invXForm(double p, double p1, double p2,
double s1, double s2) const
{
if ( d_type == Log10 )
return exp((p - p1) / (p2 - p1) * log(s2 / s1)) * s1;
else
return s1 + (s2 - s1) / (p2 - p1) * (p - p1);
}
/*!
\brief Constructor
The scale and paint device intervals are both set to [0,1].
*/
QwtScaleMap::QwtScaleMap():
d_s1(0.0),
d_s2(1.0),
d_p1(0.0),
d_p2(1.0),
d_cnv(1.0)
{
d_transformation = new QwtScaleTransformation(
QwtScaleTransformation::Linear);
}
QwtScaleMap::QwtScaleMap(const QwtScaleMap& other):
d_s1(other.d_s1),
d_s2(other.d_s2),
d_p1(other.d_p1),
d_p2(other.d_p2),
d_cnv(other.d_cnv)
{
d_transformation = other.d_transformation->copy();
}
/*!
Destructor
*/
QwtScaleMap::~QwtScaleMap()
{
delete d_transformation;
}
QwtScaleMap &QwtScaleMap::operator=(const QwtScaleMap &other)
{
d_s1 = other.d_s1;
d_s2 = other.d_s2;
d_p1 = other.d_p1;
d_p2 = other.d_p2;
d_cnv = other.d_cnv;
delete d_transformation;
d_transformation = other.d_transformation->copy();
return *this;
}
/*!
Initialize the map with a transformation
*/
void QwtScaleMap::setTransformation(
QwtScaleTransformation *transformation)
{
if ( transformation == NULL )
return;
delete d_transformation;
d_transformation = transformation;
setScaleInterval(d_s1, d_s2);
}
//! Get the transformation
const QwtScaleTransformation *QwtScaleMap::transformation() const
{
return d_transformation;
}
/*!
\brief Specify the borders of the scale interval
\param s1 first border
\param s2 second border
\warning logarithmic scales might be aligned to [LogMin, LogMax]
*/
void QwtScaleMap::setScaleInterval(double s1, double s2)
{
if (d_transformation->type() == QwtScaleTransformation::Log10 )
{
if (s1 < LogMin)
s1 = LogMin;
else if (s1 > LogMax)
s1 = LogMax;
if (s2 < LogMin)
s2 = LogMin;
else if (s2 > LogMax)
s2 = LogMax;
}
d_s1 = s1;
d_s2 = s2;
if ( d_transformation->type() != QwtScaleTransformation::Other )
newFactor();
}
/*!
\brief Specify the borders of the paint device interval
\param p1 first border
\param p2 second border
*/
void QwtScaleMap::setPaintInterval(int p1, int p2)
{
d_p1 = p1;
d_p2 = p2;
if ( d_transformation->type() != QwtScaleTransformation::Other )
newFactor();
}
/*!
\brief Specify the borders of the paint device interval
\param p1 first border
\param p2 second border
*/
void QwtScaleMap::setPaintXInterval(double p1, double p2)
{
d_p1 = p1;
d_p2 = p2;
if ( d_transformation->type() != QwtScaleTransformation::Other )
newFactor();
}
/*!
\brief Re-calculate the conversion factor.
*/
void QwtScaleMap::newFactor()
{
d_cnv = 0.0;
#if 1
if (d_s2 == d_s1)
return;
#endif
switch( d_transformation->type() )
{
case QwtScaleTransformation::Linear:
d_cnv = (d_p2 - d_p1) / (d_s2 - d_s1);
break;
case QwtScaleTransformation::Log10:
d_cnv = (d_p2 - d_p1) / log(d_s2 / d_s1);
break;
default:;
}
}