Qwt User's Guide 6.1.2

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qwt_scale_map.h
1 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10 #ifndef QWT_SCALE_MAP_H
11 #define QWT_SCALE_MAP_H
12
13 #include "qwt_global.h"
14 #include "qwt_transform.h"
15 #include <qrect.h>
16
17 #ifndef QT_NO_DEBUG_STREAM
18 #include <qdebug.h>
19 #endif
20
21 class QRectF;
22
30 class QWT_EXPORT QwtScaleMap
31 {
32 public:
33 QwtScaleMap();
34 QwtScaleMap( const QwtScaleMap& );
35
36 ~QwtScaleMap();
37
38 QwtScaleMap &operator=( const QwtScaleMap & );
39
40 void setTransformation( QwtTransform * );
41 const QwtTransform *transformation() const;
42
43 void setPaintInterval( double p1, double p2 );
44 void setScaleInterval( double s1, double s2 );
45
46 double transform( double s ) const;
47 double invTransform( double p ) const;
48
49 double p1() const;
50 double p2() const;
51
52 double s1() const;
53 double s2() const;
54
55 double pDist() const;
56 double sDist() const;
57
58 static QRectF transform( const QwtScaleMap &,
59 const QwtScaleMap &, const QRectF & );
60 static QRectF invTransform( const QwtScaleMap &,
61 const QwtScaleMap &, const QRectF & );
62
63 static QPointF transform( const QwtScaleMap &,
64 const QwtScaleMap &, const QPointF & );
65 static QPointF invTransform( const QwtScaleMap &,
66 const QwtScaleMap &, const QPointF & );
67
68 bool isInverting() const;
69
70 private:
71 void updateFactor();
72
73 double d_s1, d_s2; // scale interval boundaries
74 double d_p1, d_p2; // paint device interval boundaries
75
76 double d_cnv; // conversion factor
77 double d_ts1;
78
79 QwtTransform *d_transform;
80 };
81
85 inline double QwtScaleMap::s1() const
86 {
87 return d_s1;
88 }
89
93 inline double QwtScaleMap::s2() const
94 {
95 return d_s2;
96 }
97
101 inline double QwtScaleMap::p1() const
102 {
103 return d_p1;
104 }
105
109 inline double QwtScaleMap::p2() const
110 {
111 return d_p2;
112 }
113
117 inline double QwtScaleMap::pDist() const
118 {
119 return qAbs( d_p2 - d_p1 );
120 }
121
125 inline double QwtScaleMap::sDist() const
126 {
127 return qAbs( d_s2 - d_s1 );
128 }
129
139 inline double QwtScaleMap::transform( double s ) const
140 {
141 if ( d_transform )
142 s = d_transform->transform( s );
143
144 return d_p1 + ( s - d_ts1 ) * d_cnv;
145 }
146
156 inline double QwtScaleMap::invTransform( double p ) const
157 {
158 double s = d_ts1 + ( p - d_p1 ) / d_cnv;
159 if ( d_transform )
160 s = d_transform->invTransform( s );
161
162 return s;
163 }
164
166 inline bool QwtScaleMap::isInverting() const
167 {
168 return ( ( d_p1 < d_p2 ) != ( d_s1 < d_s2 ) );
169 }
170
171 #ifndef QT_NO_DEBUG_STREAM
172 QWT_EXPORT QDebug operator<<( QDebug, const QwtScaleMap & );
173 #endif
174
175 #endif
QwtTransform::transform
virtual double transform(double value) const =0
QwtTransform
A transformation between coordinate systems.
Definition: qwt_transform.h:35
QwtScaleMap::s2
double s2() const
Definition: qwt_scale_map.h:93
QwtScaleMap::pDist
double pDist() const
Definition: qwt_scale_map.h:117
QwtScaleMap
A scale map.
Definition: qwt_scale_map.h:30
QwtScaleMap::s1
double s1() const
Definition: qwt_scale_map.h:85
QwtTransform::invTransform
virtual double invTransform(double value) const =0
QwtScaleMap::isInverting
bool isInverting() const
Definition: qwt_scale_map.h:166
QwtScaleMap::p1
double p1() const
Definition: qwt_scale_map.h:101
QwtScaleMap::p2
double p2() const
Definition: qwt_scale_map.h:109
QwtScaleMap::invTransform
double invTransform(double p) const
Definition: qwt_scale_map.h:156
QwtScaleMap::transform
double transform(double s) const
Definition: qwt_scale_map.h:139
QwtScaleMap::sDist
double sDist() const
Definition: qwt_scale_map.h:125