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Qwt User's Guide
6.1.4
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A scale engine for linear scales. More...
#include <qwt_scale_engine.h>

Public Member Functions | |
| QwtLinearScaleEngine (uint base=10) | |
| virtual | ~QwtLinearScaleEngine () |
| Destructor. | |
| virtual void | autoScale (int maxNumSteps, double &x1, double &x2, double &stepSize) const |
| virtual QwtScaleDiv | divideScale (double x1, double x2, int maxMajorSteps, int maxMinorSteps, double stepSize=0.0) const |
| Calculate a scale division for an interval. More... | |
Public Member Functions inherited from QwtScaleEngine | |
| QwtScaleEngine (uint base=10) | |
| virtual | ~QwtScaleEngine () |
| Destructor. | |
| void | setBase (uint base) |
| uint | base () const |
| void | setAttribute (Attribute, bool on=true) |
| bool | testAttribute (Attribute) const |
| void | setAttributes (Attributes) |
| Attributes | attributes () const |
| void | setReference (double) |
| Specify a reference point. More... | |
| double | reference () const |
| void | setMargins (double lower, double upper) |
| Specify margins at the scale's endpoints. More... | |
| double | lowerMargin () const |
| double | upperMargin () const |
| void | setTransformation (QwtTransform *) |
| QwtTransform * | transformation () const |
Protected Member Functions | |
| QwtInterval | align (const QwtInterval &, double stepSize) const |
| Align an interval to a step size. More... | |
| void | buildTicks (const QwtInterval &, double stepSize, int maxMinorSteps, QList< double > ticks[QwtScaleDiv::NTickTypes]) const |
| Calculate ticks for an interval. More... | |
| QList< double > | buildMajorTicks (const QwtInterval &interval, double stepSize) const |
| Calculate major ticks for an interval. More... | |
| void | buildMinorTicks (const QList< double > &majorTicks, int maxMinorSteps, double stepSize, QList< double > &minorTicks, QList< double > &mediumTicks) const |
| Calculate minor/medium ticks for major ticks. More... | |
Protected Member Functions inherited from QwtScaleEngine | |
| bool | contains (const QwtInterval &, double value) const |
| QList< double > | strip (const QList< double > &, const QwtInterval &) const |
| double | divideInterval (double intervalSize, int numSteps) const |
| QwtInterval | buildInterval (double value) const |
| Build an interval around a value. More... | |
Additional Inherited Members | |
Public Types inherited from QwtScaleEngine | |
| enum | Attribute { NoAttribute = 0x00, IncludeReference = 0x01, Symmetric = 0x02, Floating = 0x04, Inverted = 0x08 } |
| typedef QFlags< Attribute > | Attributes |
| Layout attributes. | |
A scale engine for linear scales.
The step size will fit into the pattern
, where n is an integer.
| QwtLinearScaleEngine::QwtLinearScaleEngine | ( | uint | base = 10 | ) |
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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 |
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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.
Reimplemented in QwtDateScaleEngine.
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protected |
Calculate major ticks for an interval.
| interval | Interval |
| stepSize | Step size |
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protected |
Calculate minor/medium ticks for major ticks.
| majorTicks | Major ticks |
| maxMinorSteps | Maximum number of minor steps |
| stepSize | Step size |
| minorTicks | Array to be filled with the calculated minor ticks |
| mediumTicks | Array to be filled with the calculated medium ticks |
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protected |
Calculate ticks for an interval.
| interval | Interval |
| stepSize | Step size |
| maxMinorSteps | Maximum number of minor steps |
| ticks | Arrays to be filled with the calculated ticks |
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virtual |
Calculate a scale division for an interval.
| x1 | First interval limit |
| x2 | Second interval limit |
| maxMajorSteps | Maximum for the number of major steps |
| maxMinorSteps | Maximum number of minor steps |
| stepSize | Step size. If stepSize == 0, the engine calculates one. |
Implements QwtScaleEngine.
Reimplemented in QwtDateScaleEngine.