QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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qgsgraduatedhistogramwidget.h
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1/***************************************************************************
2 qgsgraduatedhistogramwidget.h
3 -----------------------------
4 begin : May 2015
5 copyright : (C) 2015 by Nyall Dawson
6 email : nyall dot dawson at gmail dot com
7 ***************************************************************************/
8
9/***************************************************************************
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 ***************************************************************************/
17#ifndef QGSGRADUATEDHISTOGRAMWIDGET_H
18#define QGSGRADUATEDHISTOGRAMWIDGET_H
19
20#include "qgshistogramwidget.h"
21#include "qgis_sip.h"
22#include "qgis_gui.h"
23
24class QwtPlotPicker;
25class QgsGraduatedHistogramEventFilter;
26
36{
37 Q_OBJECT
38
39 public:
40
45 QgsGraduatedHistogramWidget( QWidget *parent SIP_TRANSFERTHIS = nullptr );
46
52 void setRenderer( QgsGraduatedSymbolRenderer *renderer );
53
54 signals:
55
61 void rangesModified( bool rangesAdded );
62
63 protected:
64
65 void drawHistogram() override;
66
67 private slots:
68
69 void mousePress( double value );
70 void mouseRelease( double value );
71
72 private:
73
74 QgsGraduatedSymbolRenderer *mRenderer = nullptr;
75 QwtPlotPicker *mHistoPicker = nullptr;
76 QgsGraduatedHistogramEventFilter *mFilter = nullptr;
77 double mPressedValue = 0;
78
79 void findClosestRange( double value, int &closestRangeIndex, int &pixelDistance ) const;
80
81 QwtPlotHistogram *createPlotHistogram( const QString &title, const QColor &color ) const;
82
83};
84
85
86#ifndef SIP_RUN
87//
88// NOTE:
89// For private use by QgsGraduatedHistogramWidget only,
90// not part of stable api or exposed to Python bindings
91//
93class GUI_EXPORT QgsGraduatedHistogramEventFilter: public QObject
94{
95 Q_OBJECT
96
97 public:
98
99 QgsGraduatedHistogramEventFilter( QwtPlot *plot );
100
101 bool eventFilter( QObject *object, QEvent *event ) override;
102
103 signals:
104
105 void mousePress( double );
106 void mouseRelease( double );
107
108 private:
109
110 QwtPlot *mPlot = nullptr;
111 double posToValue( QPointF point ) const;
112};
114#endif
115
116#endif //QGSGRADUATEDHISTOGRAMWIDGET_H
Graphical histogram for displaying distribution of field values and editing range breaks for a QgsGra...
void rangesModified(bool rangesAdded)
Emitted when the user modifies the graduated ranges using the histogram widget.
A vector feature renderer which uses numeric attributes to classify features into different ranges.
Graphical histogram for displaying distributions of field values.
virtual void drawHistogram()
Updates and redraws the histogram.
#define SIP_TRANSFERTHIS
Definition qgis_sip.h:53