GeojsonSourceProperties class
Constructors
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GeojsonSourceProperties({Object? data, double? maxzoom = 18, String? attribution, double? buffer = 128, double? tolerance = 0.375, bool? cluster = false, double? clusterRadius = 50, double? clusterMaxZoom, Object? clusterProperties, bool? lineMetrics = false, bool? generateId = false, String? promoteId})
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const
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GeojsonSourceProperties.fromJson(Map<String, dynamic> json)
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factory
Properties
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attribution
→ String?
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Contains an attribution to be displayed when the map is shown to a
user.
final
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buffer
→ double?
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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.
final
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cluster
→ bool?
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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:
final
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clusterMaxZoom
→ double?
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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).
final
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clusterProperties
→ Object?
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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.Example: {"sum": ["+", ["get", "scalerank"]]}.For more advanced use cases, in place of operator,
you can use a custom reduce expression that references a special
["accumulated"] value, e.g.:{"sum": [["+", ["accumulated"], ["get", "sum"]], ["get", "scalerank"]]}
final
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clusterRadius
→ double?
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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.
final
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data
→ Object?
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A URL to a GeoJSON file, or inline GeoJSON.
final
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generateId
→ bool?
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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.
final
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hashCode
→ int
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The hash code for this object.
no setterinherited
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lineMetrics
→ bool?
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Whether to calculate line distance metrics. This is required for line
layers that specify
line-gradient values.
final
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maxzoom
→ double?
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Maximum zoom level at which to create vector tiles (higher means
greater detail at high zoom levels).
final
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promoteId
→ String?
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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>}.
final
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runtimeType
→ Type
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A representation of the runtime type of the object.
no setterinherited
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tolerance
→ double?
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Douglas-Peucker simplification tolerance (higher means simpler
geometries and faster performance).
final
Methods
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copyWith(Object? data, double? maxzoom, String? attribution, double? buffer, double? tolerance, bool? cluster, double? clusterRadius, double? clusterMaxZoom, Object? clusterProperties, bool? lineMetrics, bool? generateId, String? promoteId)
→ GeojsonSourceProperties
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noSuchMethod(Invocation invocation)
→ dynamic
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Invoked when a nonexistent method or property is accessed.
inherited
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toJson()
→ Map<String, dynamic>
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override
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toString()
→ String
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A string representation of this object.
inherited
