Method

MaplibreNativeFfiRenderSessionget_cluster_expansion_zoom_async

Declaration [src] 

void
maplibre_native_ffi_render_session_get_cluster_expansion_zoom_async (
  MaplibreNativeFfiRenderSession* self,
  const char* source_id,
  guint32 cluster_id,
  GAsyncReadyCallback callback,
  gpointer user_data
)

Description [src]

Reads the zoom level at which a cluster of a clustered GeoJSON source splits.

cluster_id is the “cluster_id” property of a cluster feature. At the result’s zoom level, the cluster splits into two or more clusters or points.

A cluster ID can go out of date as maplibre_native_ffi_render_session_get_cluster_children_async() describes.

See mln_render_session_get_cluster_expansion_zoom in the C API reference.

It fails with these errors:

  • MAPLIBRE_NATIVE_FFI_ERROR_NOT_FOUND when the session’s most recent render attempt had no source named source_id, or the source has no cluster cluster_id.
  • MAPLIBRE_NATIVE_FFI_ERROR_INVALID_ARGUMENT when the source isn’t a GeoJSON source with clustering turned on.

This method completes asynchronously. Use maplibre_native_ffi_render_session_get_cluster_expansion_zoom_finish() inside the GAsyncReadyCallback to obtain the result of the operation.

Parameters

source_id

Type: const char*

The UTF-8 text.

The data is owned by the caller of the method.
The value is a NUL terminated UTF-8 string.
cluster_id

Type: guint32

No description available.

callback

Type: GAsyncReadyCallback

The callback to call when the call finishes.

The argument can be NULL.
user_data

Type: gpointer

The data to pass to callback.

The argument can be NULL.
The data is owned by the caller of the method.