QwtScaleArithmetic Class Reference
Arithmetic including a tolerance.
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#include <qwt_scale_engine.h>
List of all members.
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:
-
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.

- 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:
-
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()