QGIS API Documentation  3.23.0-Master (c716e02dd3)
qgsclassificationlogarithmic.h
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1 /***************************************************************************
2  qgsclassificationlogarithmic.h
3  ---------------------
4  begin : September 2019
5  copyright : (C) 2019 by Denis Rouzaud
6  email : [email protected]
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 #ifndef QGSCLASSIFICATIONLOGARITHMIC_H
17 #define QGSCLASSIFICATIONLOGARITHMIC_H
18 
19 
21 
29 {
30  public:
31 
37  {
38  NoHandling = 0,
40  PrependBreak
41  };
42 
44  QgsClassificationMethod *clone() const override;
45  QString name() const override;
46  QString id() const override;
47  QIcon icon() const override;
48  QString labelForRange( double lowerValue, double upperValue, ClassPosition position ) const override;
49  bool valuesRequired() const override;
50 
51  private:
52  QList<double> calculateBreaks( double &minimum, double &maximum, const QList<double> &values, int nclasses ) override;
53  QString valueToLabel( double value ) const override;
54 
55 
56 };
57 
58 #endif // QGSCLASSIFICATIONLOGARITHMIC_H
Implementation of a logarithmic scale method.
NegativeValueHandling
Handling of negative and 0 values in the method.
@ Discard
Negative values are discarded - this will require all values.
QgsClassificationMethod is an abstract class for implementations of classification methods.
virtual QString id() const =0
The id of the method as saved in the project, must be unique in registry.
virtual QgsClassificationMethod * clone() const =0
Returns a clone of the method.
virtual bool valuesRequired() const
Returns if the method requires values to calculate the classes If not, bounds are sufficient.
virtual QString name() const =0
The readable and translate name of the method.
virtual QIcon icon() const
The icon of the method.
virtual QString labelForRange(double lowerValue, double upperValue, ClassPosition position=Inner) const
Returns the label for a range.