Qwt User's Guide 5.2.2
Static Public Member Functions

QwtScaleArithmetic Class Reference

Arithmetic including a tolerance. More...

#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)

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:
xInput value
double QwtScaleArithmetic::ceilEps ( double  value,
double  intervalSize 
) [static]

Ceil a value, relative to an interval

Parameters:
valueValue to ceil
intervalSizeInterval 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 : $\cdot value2 - value1 <= abs(intervalSize * 10e^{-6})$

Parameters:
value1First value to compare
value2Second value to compare
intervalSizeinterval 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.

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

Parameters:
intervalSizeInterval size
numStepsNumber 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:
xInput value
double QwtScaleArithmetic::floorEps ( double  value,
double  intervalSize 
) [static]

Floor a value, relative to an interval

Parameters:
valueValue to floor
intervalSizeInterval size
See also:
floorEps()