Package com.luciad.lucy.map.labeling

Class TLcyGXYLabelPlacementHint

java.lang.Object

com.luciad.lucy.map.labeling.TLcyGXYLabelPlacementHint

public class TLcyGXYLabelPlacementHint
extends Object

A label placement hint fine-tunes label placement with a labeling group and a label obstacle provider. It is created and returned by an ILcyGXYLabelPlacementHintProvider.

A label placement group represents a group of layers. All layers of the same label placement group are labeled together. Also label placement groups place their labels completely independent from other label placement groups. Because of this, it is possible that labels from different groups overlap. The advantage of label placement groups is that slow layers can be labeled separately, and without blocking the labeling process of the other layers.

Note : The returned obstacle provider only returns obstacles for labels of the returned label placement group. It will not provide obstacles for labels of layers from an other label placement group.

Since:

10.1

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_LABEL_PLACEMENT_GROUP	This is the default labeling group used when the labeling group of a label placement hint is null.

Constructor Summary

Constructors

Constructor	Description
TLcyGXYLabelPlacementHint(ILcdGXYLabelObstacleProvider aLabelObstacleProvider, String aLabelPlacementGroup)	Creates a new label placement hint with the given parameters.
TLcyGXYLabelPlacementHint(ILcdGXYLabelLabelingAlgorithmProvider<ILcdGXYLabelingAlgorithm> aLabelingAlgorithmProvider, ILcdGXYLabelObstacleProvider aLabelObstacleProvider, String aLabelPlacementGroup)	Deprecated. use the constructor without the label algorithm provider

Method Summary

Modifier and Type	Method	Description
ILcdGXYLabelLabelingAlgorithmProvider<ILcdGXYLabelingAlgorithm>	getLabelingAlgorithmProvider()	Deprecated. label algorithms should be retrieved from the layer
ILcdGXYLabelObstacleProvider	getLabelObstacleProvider()	Returns the label obstacle provider.
String	getLabelPlacementGroup()	Returns the label placement group.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEFAULT_LABEL_PLACEMENT_GROUP

public static final String DEFAULT_LABEL_PLACEMENT_GROUP

This is the default labeling group used when the labeling group of a label placement hint is null.

See Also:

• Constant Field Values

Constructor Details

TLcyGXYLabelPlacementHint

public TLcyGXYLabelPlacementHint(ILcdGXYLabelObstacleProvider aLabelObstacleProvider,
 String aLabelPlacementGroup)

Creates a new label placement hint with the given parameters.

Parameters:

aLabelObstacleProvider - the label obstacle provider for a layer. If this parameter is null, no obstacles will be provided for the layer.

aLabelPlacementGroup - the label placement group for a layer. If this parameter is null, the background label placement group will be used (DEFAULT_LABEL_PLACEMENT_GROUP) for the layer.

Since:

2020.1

TLcyGXYLabelPlacementHint

@Deprecated
public TLcyGXYLabelPlacementHint(ILcdGXYLabelLabelingAlgorithmProvider<ILcdGXYLabelingAlgorithm> aLabelingAlgorithmProvider,
 ILcdGXYLabelObstacleProvider aLabelObstacleProvider,
 String aLabelPlacementGroup)

Deprecated.

use the constructor without the label algorithm provider

Creates a new label placement hint with the given parameters.

Parameters:

aLabelingAlgorithmProvider - the labeling algorithm provider used for labels of a layer. If the parameter is null, an algorithm provider that always returns a default labeling algorithm will be used.

aLabelObstacleProvider - the label obstacle provider for a layer. If this parameter is null, no obstacles will be provided for the layer.

aLabelPlacementGroup - the label placement group for a layer. If this parameter is null, the background label placement group will be used (DEFAULT_LABEL_PLACEMENT_GROUP) for the layer.

Method Details

getLabelingAlgorithmProvider

@Deprecated
public ILcdGXYLabelLabelingAlgorithmProvider<ILcdGXYLabelingAlgorithm> getLabelingAlgorithmProvider()

Deprecated.

label algorithms should be retrieved from the layer

Returns the labeling algorithm provider. If it is null, and the layer does not provide an algorithm, it will by default be interpreted as an algorithm provider that returns the same TLcdGXYLabelPainterLocationLabelingAlgorithm for every label.

Returns:

the labeling algorithm. Can be null.

getLabelObstacleProvider

public ILcdGXYLabelObstacleProvider getLabelObstacleProvider()

Returns the label obstacle provider. This label obstacle provider will only provider obstacles within the given label placement group (see getLabelPlacementGroup(). If it is null, it will by default be interpreted as an obstacle provider that returns no obstacles.

It should be possible to retrieve obstacles from the returned label obstacles provider without a valid Graphics argument (null).

Returns:

the label obstacle provider. Can be null.

getLabelPlacementGroup

public String getLabelPlacementGroup()

Returns the label placement group. If it is null, it will by default be interpreted as DEFAULT_LABEL_PLACEMENT_GROUP. See the class doc for more information on label placement groups.

Returns:

the label placement group. Can be null.