QwtScaleArithmetic Class Reference

#include <qwt_scale_engine.h>

List of all members.

Static Public Member Functions
static double	ceil125 (double x)
static double	ceilEps (double value, double intervalSize)
static int	compareEps (double value1, double value2, double intervalSize)
static double	divideEps (double interval, double steps)
static double	floor125 (double x)
static double	floorEps (double value, double intervalSize)

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Detailed Description

Arithmetic including a tolerance.

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Member Function Documentation

double QwtScaleArithmetic::ceil125 ( double  x )

static

Find the smallest value out of {1,2,5}*10^n with an integer number n which is greater than or equal to x

Parameters:

x	Input value

double QwtScaleArithmetic::ceilEps ( double  value, double  intervalSize  )

static

Ceil a value, relative to an interval

Parameters:

value	Value to ceil
intervalSize	Interval size

See also:

floorEps()

int QwtScaleArithmetic::compareEps ( double  value1, double  value2, double  intervalSize  )

static

Compare 2 values, relative to an interval.

Values are "equal", when :

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

double QwtScaleArithmetic::divideEps ( double  intervalSize, double  numSteps  )

static

Divide an interval into steps.

Parameters:

intervalSize	Interval size
numSteps	Number of steps

Returns:

Step size

double QwtScaleArithmetic::floor125 ( double  x )

static

Find the largest value out of {1,2,5}*10^n with an integer number n which is smaller than or equal to x.

Parameters:

x	Input value

double QwtScaleArithmetic::floorEps ( double  value, double  intervalSize  )

static

Floor a value, relative to an interval

Parameters:

value	Value to floor
intervalSize	Interval size

See also:

floorEps()