QGIS API Documentation  2.99.0-Master (08ee180)
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 
22 class QgsMapCanvas;
23 class QgsRenderContext;
24 class QPainter;
25 
30 class GUI_EXPORT QgsMapCanvasItem : public QGraphicsItem
31 {
32  protected:
33 
35  QgsMapCanvasItem( QgsMapCanvas* mapCanvas );
36 
37  virtual ~QgsMapCanvasItem();
38 
40  virtual void paint( QPainter * painter ) = 0;
41 
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 
62  virtual QRectF boundingRect() const override;
63 
65  QgsRectangle rect() const;
66 
68  void setRect( const QgsRectangle& r, bool resetRotation = true );
69 
71  QgsPoint toMapCoordinates( QPoint point ) const;
72 
74  QPointF toCanvasCoordinates( const QgsPoint& point ) const;
75 
76  protected:
77 
80 
90 
91  double mRectRotation;
92 
94  QSizeF mItemSize;
95 
96 };
97 
98 
99 #endif
A rectangle specified with double values.
Definition: qgsrectangle.h:35
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:106
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:111
Contains information about the context of a rendering operation.
QgsMapCanvas * mMapCanvas
pointer to map canvas