QGIS API Documentation  2.11.0-Master
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 = 0 ) 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 
66  Q_DECL_DEPRECATED void setPanningOffset( const QPoint& point );
67 
69  QgsRectangle rect() const;
70 
72  void setRect( const QgsRectangle& r, bool resetRotation = true );
73 
75  QgsPoint toMapCoordinates( const QPoint& point ) const;
76 
78  QPointF toCanvasCoordinates( const QgsPoint& point ) const;
79 
80  protected:
81 
84 
94 
95  double mRectRotation;
96 
101 
104 
105 };
106 
107 
108 #endif
A rectangle specified with double values.
Definition: qgsrectangle.h:35
virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)=0
An abstract class for items that can be placed on the map canvas.
QPoint mPanningOffset
offset from normal position due current panning operation, used when converting map coordinates to mo...
Map canvas is a class for displaying all GIS data types on a canvas.
Definition: qgsmapcanvas.h:105
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:63
Contains information about the context of a rendering operation.
virtual QRectF boundingRect() const =0
QgsMapCanvas * mMapCanvas
pointer to map canvas