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gpx-rs/wasm/src/queries/routing.rs

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+//! The anchors of the routing tool among the trackpoints of the selection.
+
+use gpx_engine as engine;
+use js_sys::{Uint8Array, Uint32Array};
+use wasm_bindgen::prelude::*;
+
+use crate::convert::*;
+use crate::session::*;
+use crate::ts::*;
+
+// Routing buffers
+//
+// The anchors of the routing tool among the trackpoints of the selection (the numbering is the one
+// of the statistics buffers). The ends of the segments are always anchors.
+
+pub(crate) fn with_routing<T>(f: impl FnOnce(&engine::RoutingBuffer) -> T) -> Option<T> {
+    ENGINE.with(|engine| engine.borrow().as_ref().map(|e| f(e.routing())))
+}
+
+/// The index in the selection of each anchor.
+#[wasm_bindgen]
+pub fn anchor_indices() -> Uint32Array {
+    with_routing(|r| Uint32Array::from(&r.anchor_indices[..]))
+        .unwrap_or_else(|| Uint32Array::new_with_length(0))
+}
+
+/// The lowest map zoom level at which each anchor is shown.
+#[wasm_bindgen]
+pub fn anchor_zooms() -> Uint8Array {
+    with_routing(|r| Uint8Array::from(&r.anchor_zooms[..]))
+        .unwrap_or_else(|| Uint8Array::new_with_length(0))
+}
+
+/// Index in the selection of the first trackpoint of each selected segment that has some.
+#[wasm_bindgen]
+pub fn segment_starts() -> Uint32Array {
+    with_routing(|r| Uint32Array::from(&r.segment_starts[..]))
+        .unwrap_or_else(|| Uint32Array::new_with_length(0))
+}
+
+/// The id of each selected segment that has trackpoints, as `segment_starts`.
+#[wasm_bindgen]
+pub fn segment_ids() -> StringList {
+    with_routing(|r| array(&r.segment_ids, |id| id.0.to_string().into()))
+        .unwrap_or_default()
+        .unchecked_into()
+}
+
+/// Changes when the selected segments or their trackpoints change: the indices in the selection
+/// are only valid while it stays the same.
+#[wasm_bindgen]
+pub fn routing_revision() -> u32 {
+    with_routing(|r| r.revision).unwrap_or_default()
+}