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qgsrulebasedrendererv2.h
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1 /***************************************************************************
2  qgsrulebasedrendererv2.h - Rule-based renderer (symbology-ng)
3  ---------------------
4  begin : May 2010
5  copyright : (C) 2010 by Martin Dobias
6  email : wonder dot 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 QGSRULEBASEDRENDERERV2_H
17 #define QGSRULEBASEDRENDERERV2_H
18 
19 #include "qgsfield.h"
20 #include "qgsfeature.h"
21 #include "qgis.h"
22 
23 #include "qgsrendererv2.h"
24 
25 class QgsExpression;
26 
29 
34 class CORE_EXPORT QgsRuleBasedRendererV2 : public QgsFeatureRendererV2
35 {
36  public:
37 
38 
39  // TODO: use QVarLengthArray instead of QList
40 
41  enum FeatureFlags { FeatIsSelected = 1, FeatDrawMarkers = 2 };
42 
43  // feature for rendering: QgsFeature and some flags
45  {
46  FeatureToRender( QgsFeature& _f, int _flags ) : feat( _f ), flags( _flags ) {}
48  int flags; // selected and/or draw markers
49  };
50 
51  // rendering job: a feature to be rendered with a particular symbol
52  // (both f, symbol are _not_ owned by this class)
53  struct RenderJob
54  {
55  RenderJob( FeatureToRender& _ftr, QgsSymbolV2* _s ) : ftr( _ftr ), symbol( _s ) {}
58  };
59 
60  // render level: a list of jobs to be drawn at particular level
61  // (jobs are owned by this class)
62  struct RenderLevel
63  {
64  RenderLevel( int z ): zIndex( z ) {}
65  ~RenderLevel() { foreach ( RenderJob* j, jobs ) delete j; }
66  int zIndex;
67  QList<RenderJob*> jobs;
68  };
69 
70  // rendering queue: a list of rendering levels
71  typedef QList<RenderLevel> RenderQueue;
72 
73  class Rule;
74  typedef QList<Rule*> RuleList;
75 
84  class CORE_EXPORT Rule
85  {
86  public:
88  Rule( QgsSymbolV2* symbol, int scaleMinDenom = 0, int scaleMaxDenom = 0, QString filterExp = QString(),
89  QString label = QString(), QString description = QString(), bool elseRule = false );
90  //Rule( const Rule& other );
91  ~Rule();
92  QString dump( int offset = 0 ) const;
93  QSet<QString> usedAttributes();
94  QgsSymbolV2List symbols();
96  QgsLegendSymbolList legendSymbolItems( double scaleDenominator = -1, QString rule = "" );
98  QgsLegendSymbolListV2 legendSymbolItemsV2( int currentLevel = -1 ) const;
99  bool isFilterOK( QgsFeature& f ) const;
100  bool isScaleOK( double scale ) const;
101 
102  QgsSymbolV2* symbol() { return mSymbol; }
103  QString label() const { return mLabel; }
104  bool dependsOnScale() const { return mScaleMinDenom != 0 || mScaleMaxDenom != 0; }
105  int scaleMinDenom() const { return mScaleMinDenom; }
106  int scaleMaxDenom() const { return mScaleMaxDenom; }
107  QgsExpression* filter() const { return mFilter; }
108  QString filterExpression() const { return mFilterExp; }
109  QString description() const { return mDescription; }
111  bool checkState() const { return mCheckState; }
112 
115  QString ruleKey() const { return mRuleKey; }
116 
118  void setSymbol( QgsSymbolV2* sym );
119  void setLabel( QString label ) { mLabel = label; }
120  void setScaleMinDenom( int scaleMinDenom ) { mScaleMinDenom = scaleMinDenom; }
121  void setScaleMaxDenom( int scaleMaxDenom ) { mScaleMaxDenom = scaleMaxDenom; }
122  void setFilterExpression( QString filterExp ) { mFilterExp = filterExp; initFilter(); }
123  void setDescription( QString description ) { mDescription = description; }
125  void setCheckState( bool state ) { mCheckState = state; }
126 
128  Rule* clone() const;
129 
130  void toSld( QDomDocument& doc, QDomElement &element, QgsStringMap props );
131  static Rule* createFromSld( QDomElement& element, QGis::GeometryType geomType );
132 
133  QDomElement save( QDomDocument& doc, QgsSymbolV2Map& symbolMap );
134 
136  bool startRender( QgsRenderContext& context, const QgsFields& fields );
138  QSet<int> collectZLevels();
141  void setNormZLevels( const QMap<int, int>& zLevelsToNormLevels );
142 
143  bool renderFeature( FeatureToRender& featToRender, QgsRenderContext& context, RenderQueue& renderQueue );
144 
147  bool willRenderFeature( QgsFeature& feat );
148 
151  QgsSymbolV2List symbolsForFeature( QgsFeature& feat );
152 
154  RuleList rulesForFeature( QgsFeature& feat );
155 
156  void stopRender( QgsRenderContext& context );
157 
158  static Rule* create( QDomElement& ruleElem, QgsSymbolV2Map& symbolMap );
159 
160  RuleList& children() { return mChildren; }
161  RuleList descendants() const { RuleList l; foreach ( Rule *c, mChildren ) { l += c; l += c->children(); } return l; }
162  Rule* parent() { return mParent; }
163 
165  void appendChild( Rule* rule );
167  void insertChild( int i, Rule* rule );
169  void removeChild( Rule* rule );
171  void removeChildAt( int i );
173  void takeChild( Rule* rule );
175  Rule* takeChildAt( int i );
176 
179  Rule* findRuleByKey( QString key );
180 
181  void updateElseRules();
182 
183  void setIsElse( bool iselse ) { mElseRule = iselse; }
184  bool isElse() { return mElseRule; }
185 
186  protected:
187  void initFilter();
188 
189  Rule* mParent; // parent rule (NULL only for root rule)
191  int mScaleMinDenom, mScaleMaxDenom;
192  QString mFilterExp, mLabel, mDescription;
193  bool mElseRule;
194  RuleList mChildren;
195  RuleList mElseRules;
196  bool mCheckState; // whether it is enabled or not
197 
198  QString mRuleKey; // string used for unique identification of rule within renderer
199 
200  // temporary
202  // temporary while rendering
203  QList<int> mSymbolNormZLevels;
204  RuleList mActiveChildren;
205  };
206 
208 
209  static QgsFeatureRendererV2* create( QDomElement& element );
210 
214  QgsRuleBasedRendererV2( QgsSymbolV2* defaultSymbol );
215 
217 
219  virtual QgsSymbolV2* symbolForFeature( QgsFeature& feature );
220 
221  virtual bool renderFeature( QgsFeature& feature, QgsRenderContext& context, int layer = -1, bool selected = false, bool drawVertexMarker = false );
222 
223  virtual void startRender( QgsRenderContext& context, const QgsFields& fields );
224 
225  virtual void stopRender( QgsRenderContext& context );
226 
227  virtual QList<QString> usedAttributes();
228 
229  virtual QgsFeatureRendererV2* clone() const;
230 
231  virtual void toSld( QDomDocument& doc, QDomElement &element ) const;
232 
233  static QgsFeatureRendererV2* createFromSld( QDomElement& element, QGis::GeometryType geomType );
234 
235  virtual QgsSymbolV2List symbols();
236 
238  virtual QDomElement save( QDomDocument& doc );
239 
241  virtual QgsLegendSymbologyList legendSymbologyItems( QSize iconSize );
242 
245  virtual bool legendSymbolItemsCheckable() const;
246 
249  virtual bool legendSymbolItemChecked( QString key );
250 
253  virtual void checkLegendSymbolItem( QString key, bool state = true );
254 
258  virtual QgsLegendSymbolList legendSymbolItems( double scaleDenominator = -1, QString rule = "" );
259 
263  virtual QgsLegendSymbolListV2 legendSymbolItemsV2() const;
264 
266  virtual QString dump() const;
267 
271  virtual bool willRenderFeature( QgsFeature& feat );
272 
277  virtual QgsSymbolV2List symbolsForFeature( QgsFeature& feat );
278 
279  virtual QgsSymbolV2List originalSymbolsForFeature( QgsFeature& feat );
280 
283  virtual int capabilities() { return MoreSymbolsPerFeature | Filter | ScaleDependent; }
284 
286 
287  Rule* rootRule() { return mRootRule; }
288 
290 
292  static void refineRuleCategories( Rule* initialRule, QgsCategorizedSymbolRendererV2* r );
294  static void refineRuleRanges( Rule* initialRule, QgsGraduatedSymbolRendererV2* r );
296  static void refineRuleScales( Rule* initialRule, QList<int> scales );
297 
301  static QgsRuleBasedRendererV2* convertFromRenderer( const QgsFeatureRendererV2 *renderer );
302 
304  static void convertToDataDefinedSymbology( QgsSymbolV2* symbol, QString sizeScaleField, QString rotationField );
305 
306  protected:
309 
310  // temporary
311  RenderQueue mRenderQueue;
312  QList<FeatureToRender> mCurrentFeatures;
313 };
314 
315 #endif // QGSRULEBASEDRENDERERV2_H
QMap< QString, QgsSymbolV2 * > QgsSymbolV2Map
Definition: qgsrendererv2.h:38
Class for parsing and evaluation of expressions (formerly called "search strings").
Definition: qgsexpression.h:89
~RenderLevel()
Definition: qgsrulebasedrendererv2.h:65
QString description() const
Definition: qgsrulebasedrendererv2.h:109
QgsSymbolV2 * symbol
Definition: qgsrulebasedrendererv2.h:57
int flags
Definition: qgsrulebasedrendererv2.h:48
Rule * mParent
Definition: qgsrulebasedrendererv2.h:189
QList< QgsSymbolV2 * > QgsSymbolV2List
Definition: qgsrendererv2.h:37
Definition: qgsrulebasedrendererv2.h:62
void setScaleMaxDenom(int scaleMaxDenom)
Definition: qgsrulebasedrendererv2.h:121
void setLabel(QString label)
Definition: qgsrulebasedrendererv2.h:119
bool mElseRule
Definition: qgsrulebasedrendererv2.h:193
Container of fields for a vector layer.
Definition: qgsfield.h:163
GeometryType
Definition: qgis.h:155
RenderJob(FeatureToRender &_ftr, QgsSymbolV2 *_s)
Definition: qgsrulebasedrendererv2.h:55
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:113
void setIsElse(bool iselse)
Definition: qgsrulebasedrendererv2.h:183
bool isElse()
Definition: qgsrulebasedrendererv2.h:184
QMap< QString, QString > QgsStringMap
Definition: qgis.h:416
bool mCheckState
Definition: qgsrulebasedrendererv2.h:196
QString mRuleKey
Definition: qgsrulebasedrendererv2.h:198
Definition: qgsgraduatedsymbolrendererv2.h:105
bool checkState() const
Definition: qgsrulebasedrendererv2.h:111
void setCheckState(bool state)
Definition: qgsrulebasedrendererv2.h:125
RuleList mElseRules
Definition: qgsrulebasedrendererv2.h:195
int mScaleMinDenom
Definition: qgsrulebasedrendererv2.h:191
int scaleMinDenom() const
Definition: qgsrulebasedrendererv2.h:105
QgsFeature feat
Definition: qgsrulebasedrendererv2.h:47
QgsSymbolV2 * symbol()
Definition: qgsrulebasedrendererv2.h:102
Definition: qgscategorizedsymbolrendererv2.h:70
RuleList mChildren
Definition: qgsrulebasedrendererv2.h:194
This class keeps data about a rules for rule-based renderer.
Definition: qgsrulebasedrendererv2.h:84
QgsExpression * filter() const
Definition: qgsrulebasedrendererv2.h:107
Definition: qgsrulebasedrendererv2.h:44
RuleList mActiveChildren
Definition: qgsrulebasedrendererv2.h:204
QString ruleKey() const
Unique rule identifier (for identification of rule within renderer)
Definition: qgsrulebasedrendererv2.h:115
QList< RenderJob * > jobs
Definition: qgsrulebasedrendererv2.h:67
Rule * mRootRule
the root node with hierarchical list of rules
Definition: qgsrulebasedrendererv2.h:308
Definition: qgssymbolv2.h:43
RenderLevel(int z)
Definition: qgsrulebasedrendererv2.h:64
RuleList descendants() const
Definition: qgsrulebasedrendererv2.h:161
QList< QPair< QString, QPixmap > > QgsLegendSymbologyList
Definition: qgspluginlayer.h:20
QString mLabel
Definition: qgsrulebasedrendererv2.h:192
FeatureToRender(QgsFeature &_f, int _flags)
Definition: qgsrulebasedrendererv2.h:46
QgsSymbolV2 * mSymbol
Definition: qgsrulebasedrendererv2.h:190
QString label() const
Definition: qgsrulebasedrendererv2.h:103
int zIndex
Definition: qgsrulebasedrendererv2.h:66
bool dependsOnScale() const
Definition: qgsrulebasedrendererv2.h:104
QgsExpression * mFilter
Definition: qgsrulebasedrendererv2.h:201
QList< Rule * > RuleList
Definition: qgsrulebasedrendererv2.h:73
int scaleMaxDenom() const
Definition: qgsrulebasedrendererv2.h:106
Definition: qgsrulebasedrendererv2.h:53
Contains information about the context of a rendering operation.
Definition: qgsrendercontext.h:39
QString filterExpression() const
Definition: qgsrulebasedrendererv2.h:108
QList< int > mSymbolNormZLevels
Definition: qgsrulebasedrendererv2.h:203
Rule * parent()
Definition: qgsrulebasedrendererv2.h:162
FeatureToRender & ftr
Definition: qgsrulebasedrendererv2.h:56
When drawing a vector layer with rule-based renderer, it goes through the rules and draws features wi...
Definition: qgsrulebasedrendererv2.h:34
RuleList & children()
Definition: qgsrulebasedrendererv2.h:160
void setDescription(QString description)
Definition: qgsrulebasedrendererv2.h:123
Rule * rootRule()
Definition: qgsrulebasedrendererv2.h:287
virtual int capabilities()
returns bitwise OR-ed capabilities of the renderer
Definition: qgsrulebasedrendererv2.h:283
Definition: qgsrendererv2.h:72
QList< QgsLegendSymbolItemV2 > QgsLegendSymbolListV2
Definition: qgslegendsymbolitemv2.h:90
RenderQueue mRenderQueue
Definition: qgsrulebasedrendererv2.h:311
FeatureFlags
Definition: qgsrulebasedrendererv2.h:41
QList< RenderLevel > RenderQueue
Definition: qgsrulebasedrendererv2.h:71
void setScaleMinDenom(int scaleMinDenom)
Definition: qgsrulebasedrendererv2.h:120
QList< QPair< QString, QgsSymbolV2 * > > QgsLegendSymbolList
Definition: qgsrendererv2.h:41
void setFilterExpression(QString filterExp)
Definition: qgsrulebasedrendererv2.h:122
QList< FeatureToRender > mCurrentFeatures
Definition: qgsrulebasedrendererv2.h:312