The step size is measured in *decades* and the major step size will be adjusted to fit the pattern , where n is a natural number including zero.
Definition at line 167 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 | log10 (const QwtDoubleInterval &) const |
QwtDoubleInterval | pow10 (const QwtDoubleInterval &) const |
void QwtLog10ScaleEngine::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 630 of file qwt_scale_engine.cpp.
References QwtScaleEngine::buildInterval(), QwtScaleEngine::divideInterval(), QwtDoubleInterval::extend(), QwtScaleEngine::hiMargin(), QwtDoubleInterval::limited(), log10(), QwtScaleEngine::loMargin(), QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), QwtScaleEngine::reference(), QwtDoubleInterval::setInterval(), QwtScaleEngine::testAttribute(), and QwtDoubleInterval::width().
QwtScaleDiv QwtLog10ScaleEngine::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 687 of file qwt_scale_engine.cpp.
References QwtScaleEngine::attributes(), QwtScaleEngine::divideInterval(), QwtLinearScaleEngine::divideScale(), QwtScaleEngine::hiMargin(), QwtScaleDiv::invert(), QwtDoubleInterval::limited(), log10(), QwtScaleEngine::loMargin(), QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), QwtDoubleInterval::normalized(), QwtScaleEngine::reference(), QwtScaleEngine::setAttributes(), QwtScaleEngine::setMargins(), QwtScaleEngine::setReference(), and QwtDoubleInterval::width().
QwtScaleTransformation * QwtLog10ScaleEngine::transformation | ( | ) | const [virtual] |
Return a transformation, for logarithmic (base 10) scales
Implements QwtScaleEngine.
Definition at line 615 of file qwt_scale_engine.cpp.
QwtDoubleInterval QwtLog10ScaleEngine::log10 | ( | const QwtDoubleInterval & | interval | ) | const [protected] |
Return the interval [log10(interval.minValue(), log10(interval.maxValue]
Definition at line 893 of file qwt_scale_engine.cpp.
References QwtDoubleInterval::maxValue(), and QwtDoubleInterval::minValue().
Referenced by autoScale(), and divideScale().
QwtDoubleInterval QwtLog10ScaleEngine::pow10 | ( | const QwtDoubleInterval & | interval | ) | const [protected] |
Return the interval [pow10(interval.minValue(), pow10(interval.maxValue]
Definition at line 903 of file qwt_scale_engine.cpp.
References QwtDoubleInterval::maxValue(), and QwtDoubleInterval::minValue().