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qwt_math.h File Reference


Detailed Description

A set of mathematical routines.

Definition in file qwt_math.h.

Include dependency graph for qwt_math.h:

Go to the source code of this file.

Defines

#define qwtMax   QMAX
#define qwtMin   QMIN
#define qwtAbs   QABS
#define LOG10_2   0.30102999566398119802
#define LOG10_3   0.47712125471966243540
#define LOG10_5   0.69897000433601885749
#define M_2PI   6.28318530717958623200
#define LOG_MIN   1.0e-100
#define LOG_MAX   1.0e100
#define M_E   2.7182818284590452354
#define M_LOG2E   1.4426950408889634074
#define M_LN2   0.69314718055994530942
#define M_LN10   2.30258509299404568402
#define M_PI   3.14159265358979323846
#define M_PI_2   1.57079632679489661923
#define M_PI_4   0.78539816339744830962
#define M_1_PI   0.31830988618379067154
#define M_2_PI   0.63661977236758134308
#define M_2_SQRTPI   1.12837916709551257390
#define M_SQRT2   1.41421356237309504880
#define M_SQRT1_2   0.70710678118654752440

Functions

QWT_EXPORT double qwtGetMin (const double *array, int size)
QWT_EXPORT double qwtGetMax (const double *array, int size)
int qwtSign (double x)
double qwtSqr (const double x)
template<class T>
qwtLim (const T &x, const T &x1, const T &x2)
QPoint qwtPolar2Pos (const QPoint &center, double radius, double angle)
QPoint qwtDegree2Pos (const QPoint &center, double radius, double angle)


Define Documentation

#define LOG_MAX   1.0e100
 

Maximum value for logarithmic scales.

Definition at line 59 of file qwt_math.h.

Referenced by QwtLog10ScaleEngine::autoScale(), and QwtLog10ScaleEngine::divideScale().

#define LOG_MIN   1.0e-100
 

Mininum value for logarithmic scales.

Definition at line 54 of file qwt_math.h.

Referenced by QwtLog10ScaleEngine::autoScale(), and QwtLog10ScaleEngine::divideScale().


Function Documentation

QWT_EXPORT double qwtGetMax const double *  array,
int  size
 

Find the largest value in an array.

Parameters:
array Pointer to an array
size Array size

Definition at line 37 of file qwt_math.cpp.

QWT_EXPORT double qwtGetMin const double *  array,
int  size
 

Find the smallest value in an array.

Parameters:
array Pointer to an array
size Array size

Definition at line 19 of file qwt_math.cpp.

template<class T>
T qwtLim const T &  x,
const T &  x1,
const T &  x2
 

Limit a value to fit into a specified interval.

Parameters:
x Input value
x1 First interval boundary
x2 Second interval boundary

Definition at line 142 of file qwt_math.h.

Referenced by QwtArrowButton::QwtArrowButton(), QwtScaleDraw::setAngleRange(), QwtDoubleRange::setRange(), QwtWheel::setTickCnt(), QwtWheel::setTotalAngle(), QwtWheel::setViewAngle(), and QwtPlotCurve::verifyRange().

int qwtSign double  x  ) 
 

Return the sign.

Definition at line 119 of file qwt_math.h.

double qwtSqr const double  x  ) 
 

Return the square of a number.

Definition at line 130 of file qwt_math.h.

Referenced by QwtPlotCurve::drawSpline().


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