QGIS API Documentation  2.99.0-Master (0a63d1f)
qgsmapcanvasitem.h
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1 /***************************************************************************
2  qgsmapcanvasitem.h - base class for map canvas items
3  ----------------------
4  begin : February 2006
5  copyright : (C) 2006 by Martin Dobias
6  email : wonder.sk at gmail dot com
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 QGSMAPCANVASITEM_H
17 #define QGSMAPCANVASITEM_H
18 
19 #include <QGraphicsItem>
20 #include "qgsrectangle.h"
21 #include "qgis_gui.h"
22 
23 class QgsMapCanvas;
24 class QgsRenderContext;
25 class QPainter;
26 
31 class GUI_EXPORT QgsMapCanvasItem : public QGraphicsItem
32 {
33  protected:
34 
36  QgsMapCanvasItem( QgsMapCanvas* mapCanvas );
37 
38  virtual ~QgsMapCanvasItem();
39 
41  virtual void paint( QPainter * painter ) = 0;
42 
43  virtual void paint( QPainter * painter,
44  const QStyleOptionGraphicsItem * option,
45  QWidget * widget = nullptr ) override;
46 
48  void updateCanvas();
49 
54  bool setRenderContextVariables( QPainter* p, QgsRenderContext& context ) const;
55 
56  public:
57 
59  virtual void updatePosition();
60 
61  virtual QRectF boundingRect() const override;
62 
64  QgsRectangle rect() const;
65 
67  void setRect( const QgsRectangle& r, bool resetRotation = true );
68 
70  QgsPoint toMapCoordinates( QPoint point ) const;
71 
73  QPointF toCanvasCoordinates( const QgsPoint& point ) const;
74 
75  protected:
76 
79 
89 
90  double mRectRotation;
91 
93  QSizeF mItemSize;
94 
95 };
96 
97 
98 #endif
A rectangle specified with double values.
Definition: qgsrectangle.h:36
An abstract class for items that can be placed on the map canvas.
Map canvas is a class for displaying all GIS data types on a canvas.
Definition: qgsmapcanvas.h:74
QSizeF mItemSize
cached size of the item (to return in boundingRect())
QgsRectangle mRect
cached canvas item rectangle in map coordinates encodes position (xmin,ymax) and size (width/height) ...
A class to represent a point.
Definition: qgspoint.h:143
Contains information about the context of a rendering operation.
QgsMapCanvas * mMapCanvas
pointer to map canvas