QGIS API Documentation  2.18.21-Las Palmas (9fba24a)
Public Types | Public Member Functions | Protected Member Functions | Protected Attributes | Friends | List of all members
pal::Layer Class Reference

A set of features which influence the labelling process. More...

#include <layer.h>

Public Types

enum  LabelMode { LabelPerFeature, LabelPerFeaturePart }
 
enum  UpsideDownLabels { Upright, ShowDefined, ShowAll }
 

Public Member Functions

virtual ~Layer ()
 
bool active () const
 Returns whether the layer is currently active. More...
 
QgsPalLayerSettings::Placement arrangement () const
 Returns the layer's arrangement policy. More...
 
LineArrangementFlags arrangementFlags () const
 Returns the layer's arrangement flags. More...
 
bool centroidInside () const
 Returns whether labels placed at the centroid of features within the layer are forced to be placed inside the feature's geometry. More...
 
void chopFeaturesAtRepeatDistance ()
 Chop layer features at the repeat distance. More...
 
int connectedFeatureId (QgsFeatureId featureId) const
 Returns the connected feature ID for a label feature ID, which is unique for all features which have been joined as a result of joinConnectedFeatures() More...
 
bool displayAll () const
 
int featureCount ()
 Returns the number of features in layer. More...
 
bool isCurved () const
 Returns true if the layer has curved labels. More...
 
void joinConnectedFeatures ()
 Join connected features with the same label text. More...
 
bool labelLayer () const
 Returns whether the layer will be labeled or not. More...
 
LabelMode labelMode () const
 Returns the layer's labeling mode. More...
 
bool mergeConnectedLines () const
 Returns whether connected lines will be merged before labeling. More...
 
QString name () const
 Returns the layer's name. More...
 
QgsPalLayerSettings::ObstacleType obstacleType () const
 Returns the obstacle type, which controls how features within the layer act as obstacles for labels. More...
 
double priority () const
 Returns the layer's priority, between 0 and 1. More...
 
QgsAbstractLabelProviderprovider () const
 Returns pointer to the associated provider. More...
 
bool registerFeature (QgsLabelFeature *label)
 Register a feature in the layer. More...
 
void setActive (bool active)
 Sets whether the layer is currently active. More...
 
void setArrangement (QgsPalLayerSettings::Placement arrangement)
 Sets the layer's arrangement policy. More...
 
void setArrangementFlags (const LineArrangementFlags &flags)
 Sets the layer's arrangement flags. More...
 
void setCentroidInside (bool forceInside)
 Sets whether labels placed at the centroid of features within the layer are forced to be placed inside the feature's geometry. More...
 
void setLabelLayer (bool toLabel)
 Sets whether the layer will be labeled. More...
 
void setLabelMode (LabelMode mode)
 Sets the layer's labeling mode. More...
 
void setMergeConnectedLines (bool merge)
 Sets whether connected lines should be merged before labeling. More...
 
void setObstacleType (QgsPalLayerSettings::ObstacleType obstacleType)
 Sets the obstacle type, which controls how features within the layer act as obstacles for labels. More...
 
void setPriority (double priority)
 Sets the layer's priority. More...
 
void setUpsidedownLabels (UpsideDownLabels ud)
 Sets how upside down labels will be handled within the layer. More...
 
UpsideDownLabels upsidedownLabels () const
 Returns how upside down labels are handled within the layer. More...
 

Protected Member Functions

 Layer (QgsAbstractLabelProvider *provider, const QString &name, QgsPalLayerSettings::Placement arrangement, double defaultPriority, bool active, bool toLabel, Pal *pal, bool displayAll=false)
 Create a new layer. More...
 
void addFeaturePart (FeaturePart *fpart, const QString &labelText=QString())
 Add newly created feature part into r tree and to the list. More...
 
void addObstaclePart (FeaturePart *fpart)
 Add newly created obstacle part into r tree and to the list. More...
 

Protected Attributes

bool mActive
 
QgsPalLayerSettings::Placement mArrangement
 Optional flags used for some placement methods. More...
 
LineArrangementFlags mArrangementFlags
 
bool mCentroidInside
 
QHash< QgsFeatureId, int > mConnectedFeaturesIds
 
QHash< QString, QLinkedList< FeaturePart * > *> mConnectedHashtable
 
QStringList mConnectedTexts
 
double mDefaultPriority
 
bool mDisplayAll
 
RTree< FeaturePart *, double, 2, double, 8, 4 > * mFeatureIndex
 
QLinkedList< FeaturePart * > mFeatureParts
 List of feature parts. More...
 
QHash< QgsFeatureId, QgsLabelFeature * > mHashtable
 Lookup table of label features (owned by the label feature provider that created them) More...
 
bool mLabelLayer
 
bool mMergeLines
 
LabelMode mMode
 
QMutex mMutex
 
QString mName
 
RTree< FeaturePart *, double, 2, double, 8, 4 > * mObstacleIndex
 
QList< FeaturePart * > mObstacleParts
 List of obstacle parts. More...
 
QgsPalLayerSettings::ObstacleType mObstacleType
 
QgsAbstractLabelProvidermProvider
 
UpsideDownLabels mUpsidedownLabels
 
Palpal
 

Friends

class FeaturePart
 
class LabelPosition
 
class Pal
 
class Problem
 

Detailed Description

A set of features which influence the labelling process.

Note
not available in Python bindings

Definition at line 58 of file layer.h.

Member Enumeration Documentation

◆ LabelMode

Enumerator
LabelPerFeature 
LabelPerFeaturePart 

Definition at line 68 of file layer.h.

◆ UpsideDownLabels

Enumerator
Upright 
ShowDefined 
ShowAll 

Definition at line 69 of file layer.h.

Constructor & Destructor Documentation

◆ ~Layer()

Layer::~Layer ( )
virtual

Definition at line 70 of file layer.cpp.

◆ Layer()

Layer::Layer ( QgsAbstractLabelProvider provider,
const QString name,
QgsPalLayerSettings::Placement  arrangement,
double  defaultPriority,
bool  active,
bool  toLabel,
Pal pal,
bool  displayAll = false 
)
protected

Create a new layer.

Parameters
providerAssociated provider
nameName of the layer (for stats, debugging - does not need to be unique)
arrangementArrangement mode : how to place candidates
defaultPrioritylayer's prioriry (0 is the best, 1 the worst)
activeis the layer is active (currently displayed)
toLabelthe layer will be labeled whether toLablel is true
palpointer to the pal object
displayAllif true, all features will be labelled even though overlaps occur

Definition at line 44 of file layer.cpp.

Member Function Documentation

◆ active()

bool pal::Layer::active ( ) const
inline

Returns whether the layer is currently active.

See also
setActive

Definition at line 132 of file layer.h.

◆ addFeaturePart()

void Layer::addFeaturePart ( FeaturePart fpart,
const QString labelText = QString() 
)
protected

Add newly created feature part into r tree and to the list.

Definition at line 290 of file layer.cpp.

◆ addObstaclePart()

void Layer::addObstaclePart ( FeaturePart fpart)
protected

Add newly created obstacle part into r tree and to the list.

Definition at line 321 of file layer.cpp.

◆ arrangement()

QgsPalLayerSettings::Placement pal::Layer::arrangement ( ) const
inline

Returns the layer's arrangement policy.

See also
setArrangement

Definition at line 94 of file layer.h.

◆ arrangementFlags()

LineArrangementFlags pal::Layer::arrangementFlags ( ) const
inline

Returns the layer's arrangement flags.

See also
setArrangementFlags

Definition at line 109 of file layer.h.

◆ centroidInside()

bool pal::Layer::centroidInside ( ) const
inline

Returns whether labels placed at the centroid of features within the layer are forced to be placed inside the feature's geometry.

See also
setCentroidInside

Definition at line 218 of file layer.h.

◆ chopFeaturesAtRepeatDistance()

void Layer::chopFeaturesAtRepeatDistance ( )

Chop layer features at the repeat distance.

Definition at line 419 of file layer.cpp.

◆ connectedFeatureId()

int Layer::connectedFeatureId ( QgsFeatureId  featureId) const

Returns the connected feature ID for a label feature ID, which is unique for all features which have been joined as a result of joinConnectedFeatures()

Returns
connected feature ID, or -1 if feature was not joined

Definition at line 414 of file layer.cpp.

◆ displayAll()

bool pal::Layer::displayAll ( ) const
inline

Definition at line 78 of file layer.h.

◆ featureCount()

int pal::Layer::featureCount ( )
inline

Returns the number of features in layer.

Definition at line 82 of file layer.h.

◆ isCurved()

bool pal::Layer::isCurved ( ) const
inline

Returns true if the layer has curved labels.

Definition at line 98 of file layer.h.

◆ joinConnectedFeatures()

void Layer::joinConnectedFeatures ( )

Join connected features with the same label text.

Definition at line 351 of file layer.cpp.

◆ labelLayer()

bool pal::Layer::labelLayer ( ) const
inline

Returns whether the layer will be labeled or not.

See also
setLabelLayer

Definition at line 145 of file layer.h.

◆ labelMode()

LabelMode pal::Layer::labelMode ( ) const
inline

Returns the layer's labeling mode.

See also
setLabelMode

Definition at line 182 of file layer.h.

◆ mergeConnectedLines()

bool pal::Layer::mergeConnectedLines ( ) const
inline

Returns whether connected lines will be merged before labeling.

See also
setMergeConnectedLines

Definition at line 193 of file layer.h.

◆ name()

QString pal::Layer::name ( ) const
inline

Returns the layer's name.

Definition at line 89 of file layer.h.

◆ obstacleType()

QgsPalLayerSettings::ObstacleType pal::Layer::obstacleType ( ) const
inline

Returns the obstacle type, which controls how features within the layer act as obstacles for labels.

See also
setObstacleType

Definition at line 151 of file layer.h.

◆ priority()

double pal::Layer::priority ( ) const
inline

Returns the layer's priority, between 0 and 1.

0 corresponds to highest priority, 1 to lowest priority.

See also
setPriority

Definition at line 171 of file layer.h.

◆ provider()

QgsAbstractLabelProvider* pal::Layer::provider ( ) const
inline

Returns pointer to the associated provider.

Definition at line 85 of file layer.h.

◆ registerFeature()

bool Layer::registerFeature ( QgsLabelFeature label)

Register a feature in the layer.

Does not take ownership of the label feature (it is owned by its provider).

Exceptions
PalException::FeatureExists
Returns
true on success (i.e. valid geometry)

Definition at line 96 of file layer.cpp.

◆ setActive()

void pal::Layer::setActive ( bool  active)
inline

Sets whether the layer is currently active.

Active means "is currently displayed or used as obstacles". When a layer is deactivated then feature of this layer will not be used for either labelling or as obstacles.

Parameters
activeset to true to make the layer active, or false to deactivate the layer
See also
active

Definition at line 127 of file layer.h.

◆ setArrangement()

void pal::Layer::setArrangement ( QgsPalLayerSettings::Placement  arrangement)
inline

Sets the layer's arrangement policy.

Parameters
arrangementarrangement policy
See also
arrangement

Definition at line 104 of file layer.h.

◆ setArrangementFlags()

void pal::Layer::setArrangementFlags ( const LineArrangementFlags &  flags)
inline

Sets the layer's arrangement flags.

Parameters
flagsarrangement flags
See also
arrangementFlags

Definition at line 115 of file layer.h.

◆ setCentroidInside()

void pal::Layer::setCentroidInside ( bool  forceInside)
inline

Sets whether labels placed at the centroid of features within the layer are forced to be placed inside the feature's geometry.

Parameters
forceInsideset to true to force centroid labels to be within the feature. If set to false then the centroid may fall outside the feature.
See also
centroidInside

Definition at line 212 of file layer.h.

◆ setLabelLayer()

void pal::Layer::setLabelLayer ( bool  toLabel)
inline

Sets whether the layer will be labeled.

Note
Layers are labelled if and only if labelLayer and active are true
Parameters
toLabelset to false disable labeling this layer
See also
labelLayer
setActive

Definition at line 140 of file layer.h.

◆ setLabelMode()

void pal::Layer::setLabelMode ( LabelMode  mode)
inline

Sets the layer's labeling mode.

Parameters
modelabel mode
See also
labelMode

Definition at line 177 of file layer.h.

◆ setMergeConnectedLines()

void pal::Layer::setMergeConnectedLines ( bool  merge)
inline

Sets whether connected lines should be merged before labeling.

Parameters
mergeset to true to merge connected lines
See also
mergeConnectedLines

Definition at line 188 of file layer.h.

◆ setObstacleType()

void pal::Layer::setObstacleType ( QgsPalLayerSettings::ObstacleType  obstacleType)
inline

Sets the obstacle type, which controls how features within the layer act as obstacles for labels.

Parameters
obstacleTypenew obstacle type
See also
obstacleType

Definition at line 158 of file layer.h.

◆ setPriority()

void Layer::setPriority ( double  priority)

Sets the layer's priority.

Parameters
prioritylayer priority, between 0 and 1. 0 corresponds to highest priority, 1 to lowest priority.
See also
priority

Definition at line 86 of file layer.cpp.

◆ setUpsidedownLabels()

void pal::Layer::setUpsidedownLabels ( UpsideDownLabels  ud)
inline

Sets how upside down labels will be handled within the layer.

Parameters
udupside down label handling mode
See also
upsideDownLabels

Definition at line 199 of file layer.h.

◆ upsidedownLabels()

UpsideDownLabels pal::Layer::upsidedownLabels ( ) const
inline

Returns how upside down labels are handled within the layer.

See also
setUpsidedownLabels

Definition at line 204 of file layer.h.

Friends And Related Function Documentation

◆ FeaturePart

friend class FeaturePart
friend

Definition at line 61 of file layer.h.

◆ LabelPosition

friend class LabelPosition
friend

Definition at line 65 of file layer.h.

◆ Pal

friend class Pal
friend

Definition at line 60 of file layer.h.

◆ Problem

friend class Problem
friend

Definition at line 63 of file layer.h.

Member Data Documentation

◆ mActive

bool pal::Layer::mActive
protected

Definition at line 257 of file layer.h.

◆ mArrangement

QgsPalLayerSettings::Placement pal::Layer::mArrangement
protected

Optional flags used for some placement methods.

Definition at line 263 of file layer.h.

◆ mArrangementFlags

LineArrangementFlags pal::Layer::mArrangementFlags
protected

Definition at line 264 of file layer.h.

◆ mCentroidInside

bool pal::Layer::mCentroidInside
protected

Definition at line 260 of file layer.h.

◆ mConnectedFeaturesIds

QHash< QgsFeatureId, int > pal::Layer::mConnectedFeaturesIds
protected

Definition at line 280 of file layer.h.

◆ mConnectedHashtable

QHash< QString, QLinkedList<FeaturePart*>* > pal::Layer::mConnectedHashtable
protected

Definition at line 278 of file layer.h.

◆ mConnectedTexts

QStringList pal::Layer::mConnectedTexts
protected

Definition at line 279 of file layer.h.

◆ mDefaultPriority

double pal::Layer::mDefaultPriority
protected

Definition at line 254 of file layer.h.

◆ mDisplayAll

bool pal::Layer::mDisplayAll
protected

Definition at line 259 of file layer.h.

◆ mFeatureIndex

RTree<FeaturePart*, double, 2, double, 8, 4>* pal::Layer::mFeatureIndex
protected

Definition at line 271 of file layer.h.

◆ mFeatureParts

QLinkedList<FeaturePart*> pal::Layer::mFeatureParts
protected

List of feature parts.

Definition at line 247 of file layer.h.

◆ mHashtable

QHash< QgsFeatureId, QgsLabelFeature*> pal::Layer::mHashtable
protected

Lookup table of label features (owned by the label feature provider that created them)

Definition at line 273 of file layer.h.

◆ mLabelLayer

bool pal::Layer::mLabelLayer
protected

Definition at line 258 of file layer.h.

◆ mMergeLines

bool pal::Layer::mMergeLines
protected

Definition at line 266 of file layer.h.

◆ mMode

LabelMode pal::Layer::mMode
protected

Definition at line 265 of file layer.h.

◆ mMutex

QMutex pal::Layer::mMutex
protected

Definition at line 282 of file layer.h.

◆ mName

QString pal::Layer::mName
protected

Definition at line 244 of file layer.h.

◆ mObstacleIndex

RTree<FeaturePart*, double, 2, double, 8, 4>* pal::Layer::mObstacleIndex
protected

Definition at line 276 of file layer.h.

◆ mObstacleParts

QList<FeaturePart*> pal::Layer::mObstacleParts
protected

List of obstacle parts.

Definition at line 250 of file layer.h.

◆ mObstacleType

QgsPalLayerSettings::ObstacleType pal::Layer::mObstacleType
protected

Definition at line 256 of file layer.h.

◆ mProvider

QgsAbstractLabelProvider* pal::Layer::mProvider
protected

Definition at line 243 of file layer.h.

◆ mUpsidedownLabels

UpsideDownLabels pal::Layer::mUpsidedownLabels
protected

Definition at line 268 of file layer.h.

◆ pal

Pal* pal::Layer::pal
protected

Definition at line 252 of file layer.h.


The documentation for this class was generated from the following files: