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qgsvectorfieldsymbollayer.h
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1 /***************************************************************************
2  qgsvectorfieldsymbollayer.h
3  -------------------------
4  begin : Octorer 25, 2011
5  copyright : (C) 2011 by Marco Hugentobler
6  email : marco dot hugentobler 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 QGSVECTORFIELDSYMBOLLAYER_H
19 #define QGSVECTORFIELDSYMBOLLAYER_H
20 
21 #include "qgssymbollayerv2.h"
22 
25 {
26  public:
28  {
29  Cartesian = 0,
31  Height
32  };
33 
35  {
36  ClockwiseFromNorth = 0,
37  CounterclockwiseFromEast
38  };
39 
41  {
42  Degrees = 0,
43  Radians
44  };
45 
48 
49  static QgsSymbolLayerV2* create( const QgsStringMap& properties = QgsStringMap() );
50  static QgsSymbolLayerV2* createFromSld( QDomElement &element );
51 
52  QString layerType() const { return "VectorField"; }
53 
54  bool setSubSymbol( QgsSymbolV2* symbol );
55  QgsSymbolV2* subSymbol() { return mLineSymbol; }
56 
57  void renderPoint( const QPointF& point, QgsSymbolV2RenderContext& context );
58  void startRender( QgsSymbolV2RenderContext& context );
59  void stopRender( QgsSymbolV2RenderContext& context );
60 
61  QgsSymbolLayerV2* clone() const;
62  QgsStringMap properties() const;
63 
64  void toSld( QDomDocument& doc, QDomElement &element, QgsStringMap props ) const;
65 
66  void drawPreviewIcon( QgsSymbolV2RenderContext& context, QSize size );
67 
68  QSet<QString> usedAttributes() const;
69 
70  //setters and getters
71  void setXAttribute( const QString& attribute ) { mXAttribute = attribute; }
72  QString xAttribute() const { return mXAttribute; }
73  void setYAttribute( const QString& attribute ) { mYAttribute = attribute; }
74  QString yAttribute() const { return mYAttribute; }
75  void setScale( double s ) { mScale = s; }
76  double scale() const { return mScale; }
77  void setVectorFieldType( VectorFieldType type ) { mVectorFieldType = type; }
78  VectorFieldType vectorFieldType() const { return mVectorFieldType; }
79  void setAngleOrientation( AngleOrientation orientation ) { mAngleOrientation = orientation; }
80  AngleOrientation angleOrientation() const { return mAngleOrientation; }
81  void setAngleUnits( AngleUnits units ) { mAngleUnits = units; }
82  AngleUnits angleUnits() const { return mAngleUnits; }
83 
86 
87  void setDistanceUnit( QgsSymbolV2::OutputUnit unit ) { mDistanceUnit = unit; }
88  QgsSymbolV2::OutputUnit distanceUnit() const { return mDistanceUnit; }
89 
90  private:
91  QString mXAttribute;
92  QString mYAttribute;
94  double mScale;
98 
100 
101  //Attribute indices are resolved in startRender method
102  int mXIndex;
103  int mYIndex;
104 
105  //Converts length/angle to cartesian x/y
106  void convertPolarToCartesian( double length, double angle, double& x, double& y ) const;
107 };
108 
109 #endif // QGSVECTORFIELDSYMBOLLAYER_H
virtual QSet< QString > usedAttributes() const
QgsSymbolV2::OutputUnit mDistanceUnit
void setXAttribute(const QString &attribute)
virtual QgsSymbolV2::OutputUnit outputUnit() const
void setYAttribute(const QString &attribute)
virtual QgsSymbolLayerV2 * clone() const =0
void setAngleUnits(AngleUnits units)
void startRender(QgsSymbolV2RenderContext &context)
virtual void toSld(QDomDocument &doc, QDomElement &element, QgsStringMap props) const
AngleOrientation angleOrientation() const
virtual void setOutputUnit(QgsSymbolV2::OutputUnit unit)
VectorFieldType vectorFieldType() const
QMap< QString, QString > QgsStringMap
Definition: qgis.h:416
A symbol layer class for displaying displacement arrows based on point layer attributes.
virtual void renderPoint(const QPointF &point, QgsSymbolV2RenderContext &context)=0
virtual QgsStringMap properties() const =0
QgsSymbolV2::SymbolType type() const
double ANALYSIS_EXPORT angle(Point3D *p1, Point3D *p2, Point3D *p3, Point3D *p4)
Calculates the angle between two segments (in 2 dimension, z-values are ignored)
void drawPreviewIcon(QgsSymbolV2RenderContext &context, QSize size)
QgsSymbolV2::OutputUnit distanceUnit() const
void setDistanceUnit(QgsSymbolV2::OutputUnit unit)
void setAngleOrientation(AngleOrientation orientation)
double size
Definition: qgssvgcache.cpp:77
virtual bool setSubSymbol(QgsSymbolV2 *symbol)
void setVectorFieldType(VectorFieldType type)
virtual void stopRender(QgsSymbolV2RenderContext &context)=0