QGIS API Documentation  3.23.0-Master (4fd2f04bd0)
qgsdxfpaintengine.h
Go to the documentation of this file.
1 /***************************************************************************
2  qgsdxpaintengine.h
3  ------------------
4  begin : November 2013
5  copyright : (C) 2013 by Marco Hugentobler
6  email : marco at sourcepole dot ch
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 
18 #ifndef QGSDXFPAINTENGINE_H
19 #define QGSDXFPAINTENGINE_H
20 
21 #define SIP_NO_FILE
22 
23 #include "qgis_core.h"
24 #include <QPaintEngine>
25 #include <QPainterPath>
26 #include "qgsabstractgeometry.h"
27 
28 class QgsPoint;
29 class QgsDxfExport;
30 class QgsDxfPaintDevice;
31 
32 
40 class CORE_EXPORT QgsDxfPaintEngine: public QPaintEngine
41 {
42  public:
43  QgsDxfPaintEngine( const QgsDxfPaintDevice *dxfDevice, QgsDxfExport *dxf );
44 
45  bool begin( QPaintDevice *pdev ) override;
46  bool end() override;
47  QPaintEngine::Type type() const override;
48  void updateState( const QPaintEngineState &state ) override;
49 
50  void drawPixmap( const QRectF &r, const QPixmap &pm, const QRectF &sr ) override;
51 
52  void drawPolygon( const QPointF *points, int pointCount, PolygonDrawMode mode ) override;
53  void drawPath( const QPainterPath &path ) override;
54  void drawLines( const QLineF *lines, int lineCount ) override;
55 
56  void setLayer( const QString &layer ) { mLayer = layer; }
57  QString layer() const { return mLayer; }
58 
59  void setShift( QPointF shift ) { mShift = shift; }
60 
61  private:
62  const QgsDxfPaintDevice *mPaintDevice = nullptr;
63  QgsDxfExport *mDxf = nullptr;
64 
65  //painter state information
66  QTransform mTransform;
67  QPen mPen;
68  QBrush mBrush;
70  double mOpacity = 1.0;
71  QString mLayer;
72  QPointF mShift;
73  QgsRingSequence mPolygon;
74  QPolygonF mCurrentPolygon;
75  QList<QPointF> mCurrentCurve;
76 
77  QgsPoint toDxfCoordinates( QPointF pt ) const;
78  double currentWidth() const;
79 
80  void moveTo( double dx, double dy );
81  void lineTo( double dx, double dy );
82  void curveTo( double dx, double dy );
83  void endPolygon();
84  void endCurve();
85 
86  void setRing( QgsPointSequence &polyline, const QPointF *points, int pointCount );
87 
88  //utils for bezier curve calculation
89  static QPointF bezierPoint( const QList<QPointF> &controlPolygon, double t );
90  static double bernsteinPoly( int n, int i, double t );
91  static int lower( int n, int i );
92  static double power( double a, int b );
93  static int faculty( int n );
94 
96  QColor penColor() const;
98  QColor brushColor() const;
99 };
100 
101 #endif // QGSDXFPAINTENGINE_H
Exports QGIS layers to the DXF format.
Definition: qgsdxfexport.h:65
A paint device for drawing into dxf files.
Custom paint engine for rendering to DXF drawings.
void setShift(QPointF shift)
void setLayer(const QString &layer)
QString layer() const
Point geometry type, with support for z-dimension and m-values.
Definition: qgspoint.h:49
int ANALYSIS_EXPORT faculty(int n)
Faculty function.
Definition: MathUtils.cpp:221
int ANALYSIS_EXPORT lower(int n, int i)
Lower function.
Definition: MathUtils.cpp:407
QVector< QgsPointSequence > QgsRingSequence
QVector< QgsPoint > QgsPointSequence