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39
40#include "qquickmathutils_p.h"
41
42#include <qmath.h>
43
44QQuickMathUtils::QQuickMathUtils(QObject *parent) :
45 QObject(parent)
46{
47}
48
49qreal QQuickMathUtils::pi2() const
50{
51 return M_PI * 2;
52}
53
54/*!
55 Converts the angle \a degrees to radians.
56*/
57qreal QQuickMathUtils::degToRad(qreal degrees) const {
58 return qDegreesToRadians(degrees);
59}
60
61/*!
62 Converts the angle \a degrees to radians.
63
64 This function assumes that the angle origin (0) is north, as this
65 is the origin used by all of the Extras. The angle
66 returned will have its angle origin (0) pointing east, in order to be
67 consistent with standard angles used by \l {QtQuick::Canvas}{Canvas},
68 for example.
69*/
70qreal QQuickMathUtils::degToRadOffset(qreal degrees) const {
71 return qDegreesToRadians(degrees: degrees - 90);
72}
73
74/*!
75 Converts the angle \a radians to degrees.
76*/
77qreal QQuickMathUtils::radToDeg(qreal radians) const {
78 return qRadiansToDegrees(radians);
79}
80
81/*!
82 Converts the angle \a radians to degrees.
83
84 This function assumes that the angle origin (0) is east; as is standard for
85 mathematical operations using radians (this origin is used by
86 \l {QtQuick::Canvas}{Canvas}, for example). The angle returned in degrees
87 will have its angle origin (0) pointing north, which is what the extras
88 expect.
89*/
90qreal QQuickMathUtils::radToDegOffset(qreal radians) const {
91 return qRadiansToDegrees(radians) + 90;
92}
93
94/*!
95 Returns the top left position of the item if it were centered along
96 a circle according to \a angleOnCircle and \a distanceAlongRadius.
97
98 \a angleOnCircle is from 0.0 - M_PI2.
99 \a distanceAlongRadius is the distance along the radius in M_PIxels.
100*/
101QPointF QQuickMathUtils::centerAlongCircle(qreal xCenter, qreal yCenter,
102 qreal width, qreal height, qreal angleOnCircle, qreal distanceAlongRadius) const {
103 return QPointF(
104 (xCenter - width / 2) + (distanceAlongRadius * qCos(v: angleOnCircle)),
105 (yCenter - height / 2) + (distanceAlongRadius * qSin(v: angleOnCircle)));
106}
107
108/*!
109 Returns \a number rounded to the nearest even integer.
110*/
111qreal QQuickMathUtils::roundEven(qreal number) const {
112 int rounded = qRound(d: number);
113 return rounded % 2 == 0 ? rounded : rounded + 1;
114}
115

source code of qtquickcontrols/src/extras/Private/qquickmathutils.cpp