Builder

class Builder(val sourceId: String)

Builder for GeoJsonSource.

Parameters

sourceId

the ID of the source

Constructors

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fun Builder(sourceId: String)

Functions

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Contains an attribution to be displayed when the map is shown to a user.

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fun buffer(value: Long = 128): GeoJsonSource.Builder

Size of the tile buffer on each side. A value of 0 produces no buffer. A value of 512 produces a buffer as wide as the tile itself. Larger values produce fewer rendering artifacts near tile edges and slower performance. Default value: 128. Value range: 0, 512

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Build the GeoJsonSource.

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If the data is a collection of point features, setting this to true clusters the points by radius into groups. Cluster groups become new Point features in the source with additional properties:

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Max zoom on which to cluster points if clustering is enabled. Defaults to one zoom less than maxzoom (so that last zoom features are not clustered). Clusters are re-evaluated at integer zoom levels so setting clusterMaxZoom to 14 means the clusters will be displayed until z15.

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Minimum number of points necessary to form a cluster if clustering is enabled. Defaults to 2.

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An object defining custom properties on the generated clusters if clustering is enabled, aggregating values from clustered points. Has the form {"property_name": [operator, map_expression]}. operator is any expression function that accepts at least 2 operands (e.g. "+" or "max") — it accumulates the property value from clusters/points the cluster contains; map_expression produces the value of a single point.

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fun clusterProperty(propertyName: String, operatorExpr: Expression, mapExpr: Expression): GeoJsonSource.Builder

An object defining custom properties on the generated clusters if clustering is enabled, aggregating values from clustered points. Has the form {"property_name": [operator, map_expression]}. operator is any expression function that accepts at least 2 operands (e.g. "+" or "max") — it accumulates the property value from clusters/points the cluster contains; map_expression produces the value of a single point.

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Radius of each cluster if clustering is enabled. A value of 512 indicates a radius equal to the width of a tile. Default value: 50. Minimum value: 0.

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Sets GeoJson data property as a String. value could be an URL to a GeoJSON file, or an inline GeoJSON.

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fun feature(value: Feature, dataId: String = ""): GeoJsonSource.Builder

Add a Feature to the GeojsonSource.

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fun featureCollection(value: FeatureCollection, dataId: String = ""): GeoJsonSource.Builder

Add a FeatureCollection to the GeojsonSource.

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Whether to generate ids for the GeoJSON features. When enabled, the feature.id property will be auto assigned based on its index in the features array, over-writing any previous values. Default value: false.

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fun geometry(value: Geometry, dataId: String = ""): GeoJsonSource.Builder

Add a Geometry to the GeojsonSource.

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Whether to calculate line distance metrics. This is required for line layers that specify line-gradient values. Default value: false.

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Maximum zoom level at which to create vector tiles (higher means greater detail at high zoom levels). Default value: 18.

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When loading a map, if PrefetchZoomDelta is set to any number greater than 0, the map will first request a tile at zoom level lower than zoom - delta, but so that the zoom level is multiple of delta, in an attempt to display a full map at lower resolution as quick as possible. It will get clamped at the tile source minimum zoom. Default value: 4.

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A property to use as a feature id (for feature state). Either a property name, or an object of the form {<sourceLayer>: <propertyName>}.

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This property defines a source-specific resource budget, either in tile units or in megabytes. Whenever the tile cache goes over the defined limit, the least recently used tile will be evicted from the in-memory cache. Note that the current implementation does not take into account resources allocated by the visible tiles.

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Douglas-Peucker simplification tolerance (higher means simpler geometries and faster performance). Default value: 0.375.

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Properties

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