#include "qwt_global.h"
#include <cmath>

Include dependency graph for qwt_math.h:

Macros
#define	_USE_MATH_DEFINES

#define	M_1_PI ( 0.31830988618379067154 )

#define	M_2_PI ( 0.63661977236758134308 )

#define	M_2_SQRTPI ( 1.12837916709551257390 )

#define	M_E ( 2.7182818284590452354 )

#define	M_LN10 ( 2.30258509299404568402 )

#define	M_LN2 ( 0.69314718055994530942 )

#define	M_LOG10E ( 0.43429448190325182765 )

#define	M_LOG2E ( 1.4426950408889634074 )

#define	M_PI ( 3.14159265358979323846 )

#define	M_PI_2 ( 1.57079632679489661923 )

#define	M_PI_4 ( 0.78539816339744830962 )

#define	M_SQRT1_2 ( 0.70710678118654752440 )

#define	M_SQRT2 ( 1.41421356237309504880 )

#define	undef_USE_MATH_DEFINES

Functions
int	qwtCeil (qreal value)

double	qwtCubicPolynomial (double x, double a, double b, double c, double d)

double	qwtDegrees (double degrees)
	Translate radians into degrees. More...

double	qwtFastAtan (double x)
	Approximation of arc tangent ( error below 0,005 radians ) More...

double	qwtFastAtan2 (double y, double x)
	Approximation of arc tangent ( error below 0,005 radians ) More...

int	qwtFloor (qreal value)

int	qwtFuzzyCompare (double value1, double value2, double intervalSize)
	Compare 2 values, relative to an interval. More...

QWT_CONSTEXPR double	qwtMaxF (double a, double b)

QWT_CONSTEXPR qreal	qwtMaxF (double a, float b)

QWT_CONSTEXPR qreal	qwtMaxF (float a, double b)

QWT_CONSTEXPR float	qwtMaxF (float a, float b)

QWT_CONSTEXPR double	qwtMinF (double a, double b)

QWT_CONSTEXPR qreal	qwtMinF (double a, float b)

QWT_CONSTEXPR qreal	qwtMinF (float a, double b)

QWT_CONSTEXPR float	qwtMinF (float a, float b)

QWT_EXPORT double	qwtNormalizeDegrees (double degrees)
	Normalize an angle to be int the range [0.0, 360.0[. More...

QWT_EXPORT double	qwtNormalizeRadians (double radians)
	Normalize an angle to be int the range [0.0, 2 * PI[. More...

double	qwtRadians (double degrees)
	Translate degrees into radians. More...

QWT_EXPORT quint32	qwtRand ()
	Uses QRandomGenerator for Qt >= 5.10 and qRand() otherwise. More...

int	qwtSign (double x)
	Return the sign. More...

double	qwtSqr (double x)
	Return the square of a number. More...

Macro Definition Documentation

◆ _USE_MATH_DEFINES

#define _USE_MATH_DEFINES

Definition at line 24 of file qwt_math.h.

◆ M_1_PI

#define M_1_PI ( 0.31830988618379067154 )

Definition at line 68 of file qwt_math.h.

◆ M_2_PI

#define M_2_PI ( 0.63661977236758134308 )

Definition at line 72 of file qwt_math.h.

◆ M_2_SQRTPI

#define M_2_SQRTPI ( 1.12837916709551257390 )

Definition at line 76 of file qwt_math.h.

◆ M_E

#define M_E ( 2.7182818284590452354 )

Definition at line 36 of file qwt_math.h.

◆ M_LN10

#define M_LN10 ( 2.30258509299404568402 )

Definition at line 52 of file qwt_math.h.

◆ M_LN2

#define M_LN2 ( 0.69314718055994530942 )

Definition at line 48 of file qwt_math.h.

◆ M_LOG10E

#define M_LOG10E ( 0.43429448190325182765 )

Definition at line 44 of file qwt_math.h.

◆ M_LOG2E

#define M_LOG2E ( 1.4426950408889634074 )

Definition at line 40 of file qwt_math.h.

◆ M_PI

#define M_PI ( 3.14159265358979323846 )

Definition at line 56 of file qwt_math.h.

◆ M_PI_2

#define M_PI_2 ( 1.57079632679489661923 )

Definition at line 60 of file qwt_math.h.

◆ M_PI_4

#define M_PI_4 ( 0.78539816339744830962 )

Definition at line 64 of file qwt_math.h.

◆ M_SQRT1_2

#define M_SQRT1_2 ( 0.70710678118654752440 )

Definition at line 84 of file qwt_math.h.

◆ M_SQRT2

#define M_SQRT2 ( 1.41421356237309504880 )

Definition at line 80 of file qwt_math.h.

◆ undef_USE_MATH_DEFINES

#define undef_USE_MATH_DEFINES

Definition at line 25 of file qwt_math.h.

Function Documentation

◆ qwtCeil()

int qwtCeil ( qreal value )

inline

The same as qCeil, but avoids including qmath.h

Returns: Ceiling of value.

Definition at line 266 of file qwt_math.h.

◆ qwtCubicPolynomial()

double qwtCubicPolynomial	(	double	x,
		double	a,
		double	b,
		double	c,
		double	d
	)

inline

Definition at line 244 of file qwt_math.h.

◆ qwtDegrees()

double qwtDegrees ( double degrees )

inline

Translate radians into degrees.

Definition at line 257 of file qwt_math.h.

◆ qwtFastAtan()

double qwtFastAtan ( double x )

inline

Approximation of arc tangent ( error below 0,005 radians )

Definition at line 201 of file qwt_math.h.

◆ qwtFastAtan2()

double qwtFastAtan2	(	double	y,
		double	x
	)

inline

Approximation of arc tangent ( error below 0,005 radians )

Definition at line 213 of file qwt_math.h.

◆ qwtFloor()

int qwtFloor ( qreal value )

inline

The same as qFloor, but avoids including qmath.h

Returns: Floor of value.

Definition at line 275 of file qwt_math.h.

◆ qwtFuzzyCompare()

int qwtFuzzyCompare	(	double	value1,
		double	value2,
		double	intervalSize
	)

inline

Compare 2 values, relative to an interval.

Values are "equal", when : $\cdot value2 - value1 <= abs(intervalSize * 10e^{-6})$

Parameters

value1	First value to compare
value2	Second value to compare
intervalSize	interval size

Returns: 0: if equal, -1: if value2 > value1, 1: if value1 > value2

Definition at line 170 of file qwt_math.h.

◆ qwtMaxF() [1/4]

QWT_CONSTEXPR double qwtMaxF	(	double	a,
		double	b
	)

inline

Returns: Maximum of a and b.

Definition at line 133 of file qwt_math.h.

◆ qwtMaxF() [2/4]

QWT_CONSTEXPR qreal qwtMaxF	(	double	a,
		float	b
	)

inline

Returns: Maximum of a and b.

Definition at line 145 of file qwt_math.h.

◆ qwtMaxF() [3/4]

QWT_CONSTEXPR qreal qwtMaxF	(	float	a,
		double	b
	)

inline

Returns: Maximum of a and b.

Definition at line 139 of file qwt_math.h.

◆ qwtMaxF() [4/4]

QWT_CONSTEXPR float qwtMaxF	(	float	a,
		float	b
	)

inline

Returns: Maximum of a and b.

Definition at line 127 of file qwt_math.h.

◆ qwtMinF() [1/4]

QWT_CONSTEXPR double qwtMinF	(	double	a,
		double	b
	)

inline

Returns: Minimum of a and b.

Definition at line 109 of file qwt_math.h.

◆ qwtMinF() [2/4]

QWT_CONSTEXPR qreal qwtMinF	(	double	a,
		float	b
	)

inline

Returns: Minimum of a and b.

Definition at line 121 of file qwt_math.h.

◆ qwtMinF() [3/4]

QWT_CONSTEXPR qreal qwtMinF	(	float	a,
		double	b
	)

inline

Returns: Minimum of a and b.

Definition at line 115 of file qwt_math.h.

◆ qwtMinF() [4/4]

QWT_CONSTEXPR float qwtMinF	(	float	a,
		float	b
	)

inline

Returns: Minimum of a and b.

Definition at line 103 of file qwt_math.h.

◆ qwtNormalizeDegrees()

QWT_EXPORT double qwtNormalizeDegrees ( double degrees )

Normalize an angle to be int the range [0.0, 360.0[.

Parameters

radians Angle in degrees

Returns: Normalized angle in degrees

Definition at line 35 of file qwt_math.cpp.

◆ qwtNormalizeRadians()

QWT_EXPORT double qwtNormalizeRadians ( double radians )

Normalize an angle to be int the range [0.0, 2 * PI[.

Parameters

radians Angle in radians

Returns: Normalized angle in radians

Definition at line 20 of file qwt_math.cpp.

◆ qwtRadians()

double qwtRadians ( double degrees )

inline

Translate degrees into radians.

Definition at line 251 of file qwt_math.h.

◆ qwtRand()

QWT_EXPORT quint32 qwtRand ( )

Uses QRandomGenerator for Qt >= 5.10 and qRand() otherwise.

Returns: A 32-bit random quantity

Definition at line 48 of file qwt_math.cpp.

◆ qwtSign()

int qwtSign ( double x )

inline

Return the sign.

Definition at line 184 of file qwt_math.h.

◆ qwtSqr()

double qwtSqr ( double x )

inline

Return the square of a number.

Definition at line 195 of file qwt_math.h.

Macros

Functions

Macro Definition Documentation

◆ _USE_MATH_DEFINES

◆ M_1_PI

◆ M_2_PI

◆ M_2_SQRTPI

◆ M_E

◆ M_LN10

◆ M_LN2

◆ M_LOG10E

◆ M_LOG2E

◆ M_PI

◆ M_PI_2

◆ M_PI_4

◆ M_SQRT1_2

◆ M_SQRT2

◆ undef_USE_MATH_DEFINES

Function Documentation

◆ qwtCeil()

◆ qwtCubicPolynomial()

◆ qwtDegrees()

◆ qwtFastAtan()

◆ qwtFastAtan2()

◆ qwtFloor()

◆ qwtFuzzyCompare()

◆ qwtMaxF() [1/4]

◆ qwtMaxF() [2/4]

◆ qwtMaxF() [3/4]

◆ qwtMaxF() [4/4]

◆ qwtMinF() [1/4]

◆ qwtMinF() [2/4]

◆ qwtMinF() [3/4]

◆ qwtMinF() [4/4]

◆ qwtNormalizeDegrees()

◆ qwtNormalizeRadians()

◆ qwtRadians()

◆ qwtRand()

◆ qwtSign()

◆ qwtSqr()