QGIS API Documentation  3.26.3-Buenos Aires (65e4edfdad)
qgsalgorithmtaperedbuffer.h
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1 /***************************************************************************
2  qgsalgorithmtaperedbuffer.h
3  ---------------------------
4  begin : March 2018
5  copyright : (C) 2018 by Nyall Dawson
6  email : nyall dot dawson at gmail dot com
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 QGSALGORITHMTAPEREDBUFFER_H
19 #define QGSALGORITHMTAPEREDBUFFER_H
20 
21 #define SIP_NO_FILE
22 
23 #include "qgis_core.h"
24 #include "qgis_sip.h"
25 #include "qgsprocessingalgorithm.h"
26 
28 
32 class QgsTaperedBufferAlgorithm : public QgsProcessingFeatureBasedAlgorithm
33 {
34 
35  public:
36 
37  QgsTaperedBufferAlgorithm() = default;
38  QString name() const override;
39  QString displayName() const override;
40  QStringList tags() const override;
41  QString group() const override;
42  QString groupId() const override;
43  QString shortHelpString() const override;
44  QList<int> inputLayerTypes() const override;
45  QgsTaperedBufferAlgorithm *createInstance() const override SIP_FACTORY;
46  void initParameters( const QVariantMap &configuration = QVariantMap() ) override;
47 
48  protected:
49  QString outputName() const override;
52  bool prepareAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
53  QgsFeatureList processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
54 
55  private:
56 
57  double mStartWidth = 0.0;
58  bool mDynamicStartWidth = false;
59  QgsProperty mStartWidthProperty;
60 
61  double mEndWidth = 1.0;
62  bool mDynamicEndWidth = false;
63  QgsProperty mEndWidthProperty;
64 
65  int mSegments = 16;
66  bool mDynamicSegments = false;
67  QgsProperty mSegmentsProperty;
68 
69 };
70 
71 
75 class QgsVariableWidthBufferByMAlgorithm : public QgsProcessingFeatureBasedAlgorithm
76 {
77 
78  public:
79 
80  QgsVariableWidthBufferByMAlgorithm() = default;
81  QString name() const override;
82  QString displayName() const override;
83  QStringList tags() const override;
84  QString group() const override;
85  QString groupId() const override;
86  QString shortHelpString() const override;
87  QList<int> inputLayerTypes() const override;
88  QgsVariableWidthBufferByMAlgorithm *createInstance() const override SIP_FACTORY;
89  void initParameters( const QVariantMap &configuration = QVariantMap() ) override;
90 
91  protected:
92  QString outputName() const override;
93  QgsProcessing::SourceType outputLayerType() const override;
94  QgsWkbTypes::Type outputWkbType( QgsWkbTypes::Type ) const override;
95  bool prepareAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
96  QgsFeatureList processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
97 
98  private:
99 
100  int mSegments = 16;
101  bool mDynamicSegments = false;
102  QgsProperty mSegmentsProperty;
103 
104 };
106 
107 #endif // QGSALGORITHMTAPEREDBUFFER_H
108 
109 
QgsProperty
A store for object properties.
Definition: qgsproperty.h:230
QgsProcessingAlgorithm::displayName
virtual QString displayName() const =0
Returns the translated algorithm name, which should be used for any user-visible display of the algor...
QgsProcessingFeedback
Base class for providing feedback from a processing algorithm.
Definition: qgsprocessingfeedback.h:37
QgsProcessingFeatureBasedAlgorithm::outputWkbType
virtual QgsWkbTypes::Type outputWkbType(QgsWkbTypes::Type inputWkbType) const
Maps the input WKB geometry type (inputWkbType) to the corresponding output WKB type generated by the...
Definition: qgsprocessingalgorithm.cpp:1055
QgsProcessingFeatureBasedAlgorithm::initParameters
virtual void initParameters(const QVariantMap &configuration=QVariantMap())
Initializes any extra parameters added by the algorithm subclass.
Definition: qgsprocessingalgorithm.cpp:1070
QgsProcessingAlgorithm::groupId
virtual QString groupId() const
Returns the unique ID of the group this algorithm belongs to.
Definition: qgsprocessingalgorithm.h:234
QgsProcessingAlgorithm::createInstance
virtual QgsProcessingAlgorithm * createInstance() const =0
Creates a new instance of the algorithm class.
QgsWkbTypes::Type
Type
The WKB type describes the number of dimensions a geometry has.
Definition: qgswkbtypes.h:69
QgsProcessingAlgorithm::prepareAlgorithm
virtual bool prepareAlgorithm(const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback) SIP_THROW(QgsProcessingException)
Prepares the algorithm to run using the specified parameters.
Definition: qgsprocessingalgorithm.cpp:451
QgsProcessingFeatureBasedAlgorithm
An abstract QgsProcessingAlgorithm base class for processing algorithms which operate "feature-by-fea...
Definition: qgsprocessingalgorithm.h:1143
SIP_FACTORY
#define SIP_FACTORY
Definition: qgis_sip.h:76
QgsProcessingAlgorithm::name
virtual QString name() const =0
Returns the algorithm name, used for identifying the algorithm.
QgsProcessingFeatureBasedAlgorithm::processFeature
virtual QgsFeatureList processFeature(const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback *feedback) SIP_THROW(QgsProcessingException)=0
Processes an individual input feature from the source.
QgsProcessingContext
Contains information about the context in which a processing algorithm is executed.
Definition: qgsprocessingcontext.h:46
qgsprocessingalgorithm.h
qgis_sip.h
QgsFeatureList
QList< QgsFeature > QgsFeatureList
Definition: qgsfeature.h:882
QgsProcessingAlgorithm::shortHelpString
virtual QString shortHelpString() const
Returns a localised short helper string for the algorithm.
Definition: qgsprocessingalgorithm.cpp:65
QgsProcessing
Contains enumerations and other constants for use in processing algorithms and parameters.
Definition: qgsprocessing.h:39
QgsProcessingFeatureBasedAlgorithm::outputLayerType
virtual QgsProcessing::SourceType outputLayerType() const
Returns the layer type for layers generated by this algorithm, if this is possible to determine in ad...
Definition: qgsprocessingalgorithm.cpp:1040
QgsProcessingFeatureBasedAlgorithm::outputName
virtual QString outputName() const =0
Returns the translated, user visible name for any layers created by this algorithm.
QgsProcessingAlgorithm::group
virtual QString group() const
Returns the name of the group this algorithm belongs to.
Definition: qgsprocessingalgorithm.h:225
QgsFeature
The feature class encapsulates a single feature including its unique ID, geometry and a list of field...
Definition: qgsfeature.h:55
QgsWkbTypes
Handles storage of information regarding WKB types and their properties.
Definition: qgswkbtypes.h:41
QgsProcessing::SourceType
SourceType
Data source types enum.
Definition: qgsprocessing.h:45
QgsProcessingFeatureBasedAlgorithm::inputLayerTypes
virtual QList< int > inputLayerTypes() const
Returns the valid input layer types for the source layer for this algorithm.
Definition: qgsprocessingalgorithm.cpp:1035
QgsProcessingAlgorithm::tags
virtual QStringList tags() const
Returns a list of tags which relate to the algorithm, and are used to assist users in searching for s...
Definition: qgsprocessingalgorithm.h:181