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

NAME

QwtScaleArithmetic -
Arithmetic including a tolerance.
 

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
See also:
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
See also:
floorEps()
 
 

Author

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Mon Aug 1 2011 Version 5.2.2