summaryrefslogtreecommitdiffstats
path: root/src/corelib/kernel/qmath.qdoc
blob: 48f74b64262e12d6b7a156878818e8d14d4ab93a (plain)
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
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in a
** written agreement between you and Nokia.
**
** GNU Free Documentation License
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of this
** file.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

/*! 
    \headerfile <QtCore/qmath.h>
    \title Math Functions
    \ingroup funclists
    \brief The <QtCore/qmath.h> header provides various math functions.
    \pagekeywords math trigonometry qmath floor ceiling absolute sine cosine tangent inverse tan exponent power natural logarithm
*/

/*!
    \fn int qCeil(qreal v)
    Return the ceiling of the value \a v. 

    The ceiling is the smallest integer that is not less than \a v.
    For example, if \a v is 41.2, then the ceiling is 42.
    
    \relates <QtCore/qmath.h>
    \sa qFloor()
*/

/*!
    \fn int qFloor(qreal v)
    Return the floor of the value \a v.

    The floor is the largest integer that is not greater than \a v.
    For example, if \a v is 41.2, then the floor is 41.

    \relates <QtCore/qmath.h>
    \sa qCeil()
*/

/*!
    \fn qreal qFabs(qreal v)
    Returns the absolute value of \a v as a qreal.
*/

/*!
    \fn qreal qSin(qreal v)
    Returns the sine of the angle \a v in radians.

    \relates <QtCore/qmath.h>
    \sa qCos(), qTan()
*/

/*!
    \fn  qreal qCos(qreal v)
    Returns the cosine of an angle \a v in radians.

    \relates <QtCore/qmath.h>
    \sa qSin(), qTan()
*/

/*!
    \fn qreal qTan(qreal v)
    Returns the tangent of an angle \a v in radians.

    \relates <QtCore/qmath.h>
    \sa qSin(), qCos()
*/

/*!
    \fn qreal qAcos(qreal v)
    Returns the arccosine of \a v as an angle in radians.
    Arccosine is the inverse operation of cosine.

    \relates <QtCore/qmath.h>
    \sa qAtan(), qAsin(), qCos()
*/

/*!
    \fn qreal qAsin(qreal v)
    Returns the arcsine of \a v as an angle in radians.
    Arcsine is the inverse operation of sine.

    \relates <QtCore/qmath.h>
    \sa qSin(), qAtan(), qAcos()
*/

/*!
    \fn qreal qAtan(qreal v)
    Returns the arctangent of \a v as an angle in radians.
    Arctangent is the inverse operation of tangent.

    \relates <QtCore/qmath.h>
    \sa qTan(), qAcos(), qAsin()
*/

/*!
    \fn qreal qAtan2(qreal x, qreal y)
    Returns the arctangent of a point specified by the coordinates \a x and \a y.
    This function will return the angle and its direction.

    \relates <QtCore/qmath.h>
    \sa qAtan()
*/

/*!
    \fn qreal qSqrt(qreal v)
    Returns the square root of \a v.
    This function returns a NaN if \a v is a negative number.

    \relates <QtCore/qmath.h>
    \sa qPow()
*/

/*!
    \fn qreal qLn(qreal v)
    Returns the natural logarithm of \a v. Natural logarithm uses base e.

    \relates <QtCore/qmath.h>
    \sa qExp()
*/

/*!
    \fn qreal qExp(qreal v)
    Returns the exponential function of \c e to the power of \a v.

    \relates <QtCore/qmath.h>
    \sa qLn()
*/

/*!
    \fn qreal qPow(qreal x, qreal y)
    Returns the value of \a x raised to the power of \a y.
    That is, \a x is the base and \a y is the exponent.

    \relates <QtCore/qmath.h>
    \sa qSqrt()
*/