LuciadCPillar C# 2023.1.04
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Command to draw labels for a feature. More...
Command to draw labels for a feature.
It is mandatory to specify at least the following: The anchor geometry to which the label is attached The label content
Label content
The label content can be A single line of text: see text(std::string) Multiple lines text: see text(std::vector<std::string>,HorizontalAlignment alignment) A text block: see text(TextBlock) An icon: see icon
It is mandatory to call at least one of these methods. If not, an exception will be thrown when submitting this label draw command. If these methods are called multiple times, only the last one is used. Label positions
It is possible to explicitly specify a label position. This can be done using one of the following methods: the pointPositions method: to anchor a label to a Point geometry the onPath method: to place a label along a line the inPath method: to place a label inside an area
If these methods are called multiple times, only the last one is used. If none of these methods is called, a default label positions is chosen using the LabelDrawCommand::anchor geometry. Label decluttering
Labels that are added using this class are automatically decluttered: Multiple label locations are tried to avoid overlapping labels Labels for which no good location can be found (i.e. that would always overlap with an other label) are dropped.
See the related guide for a more extensive overview of the labeling API. 2020.2
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Sets the anchor of the label.
This property is mandatory.
anchor
the anchor of the label, cannot be nullptr.
this
luciad::NullArgumentException
if the anchor is nullptr.
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Specify whether the anchor is draped or not.
If this method is not invoked, the draping status will be the same as when rendering the anchor: if all Z components equal to 0, draping is enabled and the label will be on the ground. Otherwise, the label will be placed at anchor elevation.
draped
whether the anchor is draped or not.
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Sets the icon to use for the label.
This property is optional, though it is mandatory that at least one method is used to specify the label content. See the class documentation for more info.
icon
the icon to use for the label, cannot be nullptr
this
luciad::NullArgumentException
when the icon is nullptr.
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Configure the LabelDrawCommand to paint the label inside the anchor.
The anchor is used as follows: The anchor must be a closed ring or a surface, or contain one. If it's not the case, an exception is thrown in the submit method. If the anchor is a multi geometry, only the biggest one is considered. If the anchor is an extruded one, the base geometry is considered. If the anchor is a Patch, the base geometry is considered. For other geometries, the label is positioned in such a way that it's inside the anchor geometry.
Calling this method is optional. See LabelDrawCommand for more information. this LabelDrawCommand
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Set the LabelGroup for label decluttering.
A label declutter group is a collection of labels that are positioned independently from other label declutter groups. I.e. labels from one group will never affect labels from other groups. This also means that labels from different groups are allowed to overlap.
labelGroup
declutter group for this label. See LabelGroup for more information.
this LabelDrawCommand
2021.0
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Configure the LabelDrawCommand to position a single label along a line.
Depending on how the given OnPathLabelStyle is configured, it can be located somewhere along the line, but also within the view extent at a specific location along the line, for example exactly in the middle
When this method is called, the anchor must be a Curve. If an anchor is specified that is not supported by this labeling method, an exception will be thrown when the label command is submitted. Calling this method is optional. See LabelDrawCommand for more information.
onPathLabelStyle
specifies all parameters needed to place the label at a specific location along the line, cannot be nullptr.
this LabelDrawCommand
2021.0
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Configure the LabelDrawCommand to position a single label along a line.
The label will also be placed within the view extent if possible. When this method is called, the anchor must be a Curve or consist of one in case of: MultiGeometry ExtrudedGeometry Patch CompositePatch
Also Bounds geometries are supported. If an anchor is specified that is not supported by this labeling method, an exception will be thrown when the label command is submitted. Calling this method is optional. See LabelDrawCommand for more information.
verticalPosition
specifies where the label is placed wrt to a position on the line.
additionalVerticalOffset
an additional perpendicular offset from the position on the line at which a label will be placed. This offset is expressed in pixels. If the value is positive, the label position is moved away from the line. If the value is negative, the label positions is moved towards the line. There is no maximum limit to the negative values, but keep in mind that large negative values will push the label to the opposite side of the line. The default offset is 0.
this LabelDrawCommand
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This method enables pins for labels and defines their styling.
By default, there's no pin for labels. Pins are only supported when a label is attached to a point. No pin will be painted when onPath or inPath label positioning is used.
pinStyle
the styling for the pin. See PinStyle::newBuilder. This property is optional. By default, there's no pin for labels.
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Specifies the possible positions to place a Point label.
If the anchor is not a point geometry, an exception is thrown in the submit method. Calling this method is optional. See LabelDrawCommand for more information.
positions
the possible positions for a point label. If empty, an exception is thrown.
this LabelDrawCommand
luciad::InvalidArgumentException
if the list of positions is empty.
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Sets the priority that is used to determine the order in which labels are placed.
Using a high priority will make it more likely for a label to be placed. Using a low priority will make it more likely for the label to be omitted during label placement, because other labels with a higher priority may already occupy its space.
Label priorities work across layers. This means that it is possible to give a high priority to a label, regardless of where the layer is located in the Map's LayerList. This property is optional. The default is Priority::normal().
priority
the priority for this label
this
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Indicates whether or not the label should be considered when a Map::queryFeatures is requested.
The default is true.
queryable
true if the label should be considered.
this TextDrawCommand.
2020.2
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Submits this draw command.
Nothing will be painted if the draw command is not submitted.
LogicException
if anchor is not a luciad::Point and the pointPositions method is used.
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Sets the text block to use for the label.
A text block is composed of multiple texts with different styling each. See TextBlock and TextBlock::Builder. This property is optional, though it is mandatory that at least one method is used to specify the label content. See the class documentation for more info.
text
the text block to use for the label.
this
2021.0
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Sets the text to use for the label.
This property is optional, though it is mandatory that at least one method is used to specify the label content. See the class documentation for more info.
text
the text to use for the label.
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Sets the styling for the text.
This property is optional. See the text style builder for the default values.
textStyle
the styling for the text.
this