source: trunk/src/corelib/kernel/qmath.qdoc@ 871

Last change on this file since 871 was 846, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.
File size: 3.8 KB
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1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the documentation of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:FDL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in a
14** written agreement between you and Nokia.
15**
16** GNU Free Documentation License
17** Alternatively, this file may be used under the terms of the GNU Free
18** Documentation License version 1.3 as published by the Free Software
19** Foundation and appearing in the file included in the packaging of this
20** file.
21**
22** If you have questions regarding the use of this file, please contact
23** Nokia at [email protected].
24** $QT_END_LICENSE$
25**
26****************************************************************************/
27
28/*!
29 \headerfile <QtCore/qmath.h>
30 \title Math Functions
31 \ingroup funclists
32 \brief The <QtCore/qmath.h> header provides various math functions.
33 \pagekeywords math trigonometry qmath floor ceiling absolute sine cosine tangent inverse tan exponent power natural logarithm
34*/
35
36/*!
37 \fn int qCeil(qreal v)
38 Return the ceiling of the value \a v.
39
40 The ceiling is the smallest integer that is not less than \a v.
41 For example, if \a v is 41.2, then the ceiling is 42.
42
43 \relates <QtCore/qmath.h>
44 \sa qFloor()
45*/
46
47/*!
48 \fn int qFloor(qreal v)
49 Return the floor of the value \a v.
50
51 The floor is the largest integer that is not greater than \a v.
52 For example, if \a v is 41.2, then the floor is 41.
53
54 \relates <QtCore/qmath.h>
55 \sa qCeil()
56*/
57
58/*!
59 \fn qreal qFabs(qreal v)
60 Returns the absolute value of \a v as a qreal.
61*/
62
63/*!
64 \fn qreal qSin(qreal v)
65 Returns the sine of the angle \a v in radians.
66
67 \relates <QtCore/qmath.h>
68 \sa qCos(), qTan()
69*/
70
71/*!
72 \fn qreal qCos(qreal v)
73 Returns the cosine of an angle \a v in radians.
74
75 \relates <QtCore/qmath.h>
76 \sa qSin(), qTan()
77*/
78
79/*!
80 \fn qreal qTan(qreal v)
81 Returns the tangent of an angle \a v in radians.
82
83 \relates <QtCore/qmath.h>
84 \sa qSin(), qCos()
85*/
86
87/*!
88 \fn qreal qAcos(qreal v)
89 Returns the arccosine of \a v as an angle in radians.
90 Arccosine is the inverse operation of cosine.
91
92 \relates <QtCore/qmath.h>
93 \sa qAtan(), qAsin(), qCos()
94*/
95
96/*!
97 \fn qreal qAsin(qreal v)
98 Returns the arcsine of \a v as an angle in radians.
99 Arcsine is the inverse operation of sine.
100
101 \relates <QtCore/qmath.h>
102 \sa qSin(), qAtan(), qAcos()
103*/
104
105/*!
106 \fn qreal qAtan(qreal v)
107 Returns the arctangent of \a v as an angle in radians.
108 Arctangent is the inverse operation of tangent.
109
110 \relates <QtCore/qmath.h>
111 \sa qTan(), qAcos(), qAsin()
112*/
113
114/*!
115 \fn qreal qAtan2(qreal x, qreal y)
116 Returns the arctangent of a point specified by the coordinates \a x and \a y.
117 This function will return the angle and its direction.
118
119 \relates <QtCore/qmath.h>
120 \sa qAtan()
121*/
122
123/*!
124 \fn qreal qSqrt(qreal v)
125 Returns the square root of \a v.
126 This function returns a NaN if \a v is a negative number.
127
128 \relates <QtCore/qmath.h>
129 \sa qPow()
130*/
131
132/*!
133 \fn qreal qLn(qreal v)
134 Returns the natural logarithm of \a v. Natural logarithm uses base e.
135
136 \relates <QtCore/qmath.h>
137 \sa qExp()
138*/
139
140/*!
141 \fn qreal qExp(qreal v)
142 Returns the exponential function of \c e to the power of \a v.
143
144 \relates <QtCore/qmath.h>
145 \sa qLn()
146*/
147
148/*!
149 \fn qreal qPow(qreal x, qreal y)
150 Returns the value of \a x raised to the power of \a y.
151 That is, \a x is the base and \a y is the exponent.
152
153 \relates <QtCore/qmath.h>
154 \sa qSqrt()
155*/
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