QwtScaleArithmetic

QwtScaleArithmetic

Section: C Library Functions (3) Updated: 22 Mar 2009
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NAME

QwtScaleArithmetic - Arithmetic including a tolerance.

SYNOPSIS

#include <qwt_scale_engine.h>

Static Public Member Functions

static int compareEps (double value1, double value2, double intervalSize)

static double ceilEps (double value, double intervalSize)

static double floorEps (double value, double intervalSize)

static double divideEps (double interval, double steps)

static double ceil125 (double x)

static double floor125 (double x)

Detailed Description

Arithmetic including a tolerance.

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

floorEps()

int QwtScaleArithmetic::compareEps (double value1, double value2, double intervalSize) [static]

Compare 2 values, relative to an interval.

Values are 'equal', when : \$dot 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

double QwtScaleArithmetic::divideEps (double intervalSize, double numSteps) [static]

Divide an interval into steps.

\$stepSize = (intervalSize - intervalSize * 10e^{-6}) / numSteps\$.PP 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

floorEps()

Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.

Index

NAME
SYNOPSIS
Static Public Member Functions
Detailed Description
Member Function Documentation
double QwtScaleArithmetic::ceil125 (double x) [static]
double QwtScaleArithmetic::ceilEps (double value, double intervalSize) [static]
int QwtScaleArithmetic::compareEps (double value1, double value2, double intervalSize) [static]
double QwtScaleArithmetic::divideEps (double intervalSize, double numSteps) [static]
double QwtScaleArithmetic::floor125 (double x) [static]
double QwtScaleArithmetic::floorEps (double value, double intervalSize) [static]
Author

This document was created by man2html, using the manual pages.
Time: 21:53:53 GMT, April 16, 2011