Specialized axis ticker suited for logarithmic axes. More...
#include <qcustomplot.h>
Public Member Functions | |
| double | logBase () const |
| QCPAxisTickerLog () | |
| void | setLogBase (double base) |
| void | setSubTickCount (int subTicks) |
| int | subTickCount () const |
 Public Member Functions inherited from QCPAxisTicker | |
| virtual void | generate (const QCPRange &range, const QLocale &locale, QChar formatChar, int precision, QVector< double > &ticks, QVector< double > *subTicks, QVector< QString > *tickLabels) |
| QCPAxisTicker () | |
| void | setTickCount (int count) |
| void | setTickOrigin (double origin) |
| void | setTickStepStrategy (TickStepStrategy strategy) |
| int | tickCount () const |
| double | tickOrigin () const |
| TickStepStrategy | tickStepStrategy () const |
| virtual | ~QCPAxisTicker () |
Protected Member Functions | |
| virtual QVector< double > | createTickVector (double tickStep, const QCPRange &range) Q_DECL_OVERRIDE |
| virtual int | getSubTickCount (double tickStep) Q_DECL_OVERRIDE |
| virtual double | getTickStep (const QCPRange &range) Q_DECL_OVERRIDE |
| Protected Member Functions inherited from QCPAxisTicker | |
| double | cleanMantissa (double input) const |
| virtual QVector< QString > | createLabelVector (const QVector< double > &ticks, const QLocale &locale, QChar formatChar, int precision) |
| virtual QVector< double > | createSubTickVector (int subTickCount, const QVector< double > &ticks) |
| double | getMantissa (double input, double *magnitude=0) const |
| virtual QString | getTickLabel (double tick, const QLocale &locale, QChar formatChar, int precision) |
| double | pickClosest (double target, const QVector< double > &candidates) const |
| void | trimTicks (const QCPRange &range, QVector< double > &ticks, bool keepOneOutlier) const |
Protected Attributes | |
| double | mLogBase |
| double | mLogBaseLnInv |
| int | mSubTickCount |
| Protected Attributes inherited from QCPAxisTicker | |
| int | mTickCount |
| double | mTickOrigin |
| TickStepStrategy | mTickStepStrategy |
Additional Inherited Members | |
| Public Types inherited from QCPAxisTicker | |
| enum | TickStepStrategy { tssReadability, tssMeetTickCount } |
Detailed Description
Specialized axis ticker suited for logarithmic axes.
This QCPAxisTicker subclass generates ticks with unequal tick intervals suited for logarithmic axis scales. The ticks are placed at powers of the specified log base (setLogBase).
Especially in the case of a log base equal to 10 (the default), it might be desirable to have tick labels in the form of powers of ten without mantissa display. To achieve this, set the number precision (QCPAxis::setNumberPrecision) to zero and the number format (QCPAxis::setNumberFormat) to scientific (exponential) display with beautifully typeset decimal powers, so a format string of "eb". This will result in the following axis tick labels:
The ticker can be created and assigned to an axis like this:
Definition at line 1835 of file qcustomplot.h.
Constructor & Destructor Documentation
◆ QCPAxisTickerLog()
| QCPAxisTickerLog::QCPAxisTickerLog | ( | ) |
Constructs the ticker and sets reasonable default values. Axis tickers are commonly created managed by a QSharedPointer, which then can be passed to QCPAxis::setTicker.
Definition at line 7031 of file qcustomplot.cpp.
Member Function Documentation
◆ createTickVector()
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protectedvirtual |
Reimplemented from QCPAxisTicker.
Definition at line 7106 of file qcustomplot.cpp.
◆ getSubTickCount()
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protectedvirtual |
Reimplemented from QCPAxisTicker.
Definition at line 7091 of file qcustomplot.cpp.
◆ getTickStep()
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protectedvirtual |
Reimplemented from QCPAxisTicker.
Definition at line 7077 of file qcustomplot.cpp.
◆ logBase()
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inline |
Definition at line 1841 of file qcustomplot.h.
◆ setLogBase()
| void QCPAxisTickerLog::setLogBase | ( | double | base | ) |
Sets the logarithm base used for tick coordinate generation. The ticks will be placed at integer powers of base.
Definition at line 7042 of file qcustomplot.cpp.
◆ setSubTickCount()
| void QCPAxisTickerLog::setSubTickCount | ( | int | subTicks | ) |
Sets the number of sub ticks in a tick interval. Within each interval, the sub ticks are spaced linearly to provide a better visual guide, so the sub tick density increases toward the higher tick.
Note that subTicks is the number of sub ticks (not sub intervals) in one tick interval. So in the case of logarithm base 10 an intuitive sub tick spacing would be achieved with eight sub ticks (the default). This means e.g. between the ticks 10 and 100 there will be eight ticks, namely at 20, 30, 40, 50, 60, 70, 80 and 90.
Definition at line 7062 of file qcustomplot.cpp.
◆ subTickCount()
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inline |
Definition at line 1842 of file qcustomplot.h.
Member Data Documentation
◆ mLogBase
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protected |
Definition at line 1850 of file qcustomplot.h.
◆ mLogBaseLnInv
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protected |
Definition at line 1854 of file qcustomplot.h.
◆ mSubTickCount
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protected |
Definition at line 1851 of file qcustomplot.h.
The documentation for this class was generated from the following files: