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
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.
$stepSize = (intervalSize - intervalSize * 10e^{-6}) / numSteps$.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
See also:
floorEps()
Author
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