The step size will fit into the pattern , where n is an integer.
Definition at line 126 of file qwt_scale_engine.h.
Public Member Functions | |
virtual void | autoScale (int maxSteps, double &x1, double &x2, double &stepSize) const |
virtual QwtScaleDiv | divideScale (double x1, double x2, int numMajorSteps, int numMinorSteps, double stepSize=0.0) const |
virtual QwtScaleTransformation * | transformation () const |
Protected Member Functions | |
QwtDoubleInterval | align (const QwtDoubleInterval &, double stepSize) const |
void QwtLinearScaleEngine::autoScale | ( | int | maxNumSteps, | |
double & | x1, | |||
double & | x2, | |||
double & | stepSize | |||
) | const [virtual] |
Align and divide an interval
maxNumSteps | Max. number of steps | |
x1 | First limit of the interval (In/Out) | |
x2 | Second limit of the interval (In/Out) | |
stepSize | Step size (Out) |
Implements QwtScaleEngine.
Definition at line 416 of file qwt_scale_engine.cpp.
References align(), QwtScaleEngine::buildInterval(), QwtScaleEngine::divideInterval(), QwtDoubleInterval::extend(), QwtScaleEngine::hiMargin(), QwtScaleEngine::loMargin(), QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), QwtDoubleInterval::normalized(), QwtScaleEngine::reference(), QwtDoubleInterval::setMaxValue(), QwtDoubleInterval::setMinValue(), QwtDoubleInterval::symmetrize(), QwtScaleEngine::testAttribute(), and QwtDoubleInterval::width().
QwtScaleDiv QwtLinearScaleEngine::divideScale | ( | double | x1, | |
double | x2, | |||
int | maxMajSteps, | |||
int | maxMinSteps, | |||
double | stepSize = 0.0 | |||
) | const [virtual] |
Calculate a scale division.
x1 | First interval limit | |
x2 | Second interval limit | |
maxMajSteps | Maximum for the number of major steps | |
maxMinSteps | Maximum number of minor steps | |
stepSize | Step size. If stepSize == 0, the scaleEngine calculates one. |
Implements QwtScaleEngine.
Definition at line 461 of file qwt_scale_engine.cpp.
References QwtScaleEngine::divideInterval(), and QwtDoubleInterval::width().
Referenced by QwtLog10ScaleEngine::divideScale(), and QwtDial::updateScale().
QwtScaleTransformation * QwtLinearScaleEngine::transformation | ( | ) | const [virtual] |
Return a transformation, for linear scales
Implements QwtScaleEngine.
Definition at line 401 of file qwt_scale_engine.cpp.
Referenced by QwtDial::updateScale().
QwtDoubleInterval QwtLinearScaleEngine::align | ( | const QwtDoubleInterval & | interval, | |
double | stepSize | |||
) | const [protected] |
Align an interval to a step size.
The limits of an interval are aligned that both are integer multiples of the step size.
interval | Interval | |
stepSize | Step size |
Definition at line 600 of file qwt_scale_engine.cpp.
References QwtScaleArithmetic::ceilEps(), QwtScaleArithmetic::floorEps(), QwtDoubleInterval::maxValue(), and QwtDoubleInterval::minValue().
Referenced by autoScale().