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 QwtScaleArithmetic(3) Qwt User's Guide QwtScaleArithmetic(3)

# NAME

QwtScaleArithmetic -

# SYNOPSIS

#include <qwt_scale_engine.h>

## 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)

# Detailed Description

Arithmetic including a tolerance.

# Member Function Documentation

## double QwtScaleArithmetic::ceil125 (doublex) [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 (doublevalue, doubleintervalSize) [static]

Ceil a value, relative to an interval
Parameters:
value Value to ceil

intervalSize Interval size
floorEps()

## int QwtScaleArithmetic::compareEps (doublevalue1, doublevalue2, doubleintervalSize) [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 (doubleintervalSize, doublenumSteps) [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 (doublex) [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 (doublevalue, doubleintervalSize) [static]

Floor a value, relative to an interval
Parameters:
value Value to floor

intervalSize Interval size