sparser data transfers

tauri/src/bytes.rs

@@ -34,7 +34,3 @@ pub fn optional(array: Option<Vec<u8>>) -> Bytes {
 pub fn f64_bytes(values: &[f64]) -> Vec<u8> {
     values.iter().flat_map(|v| v.to_le_bytes()).collect()
 }
-
-pub fn i64_bytes(values: &[i64]) -> Vec<u8> {
-    values.iter().flat_map(|v| v.to_le_bytes()).collect()
-}

tauri/src/commands/statistics.rs

@@ -17,15 +17,7 @@ macro_rules! f64_getters {
     )*};
 }
 
-f64_getters!(
-    total_distance,
-    slope,
-    slope_segment_slope,
-    slope_segment_distance,
-    lng,
-    lat,
-    ele
-);
+f64_getters!(total_distance, slope, slope_segment_slopes, lng, lat, ele);
 
 macro_rules! optional_f64_getters {
     ($($name:ident),*) => {$(
@@ -38,10 +30,16 @@ macro_rules! optional_f64_getters {
 
 optional_f64_getters!(speed, hr, cad, atemp, power);
 
-/// Timestamps in milliseconds since the epoch (`NO_TIME` when missing), as `i64`.
+/// The index of the first trackpoint of each smoothed elevation segment of the selection.
 #[tauri::command(async)]
-pub fn timestamps(state: State<AppState>) -> Bytes {
-    optional(state.read(|e| api::timestamps(e).map(i64_bytes)))
+pub fn slope_segment_starts(state: State<AppState>) -> Bytes {
+    u32s(&state.read(|e| api::slope_segment_starts(e).to_vec()))
+}
+
+/// What the buffers do not hold for each trackpoint of the selection, for the one at `index`.
+#[tauri::command(async)]
+pub fn selection_point(state: State<AppState>, index: usize) -> Option<api::SelectionPoint> {
+    state.read(move |e| api::selection_point(e, index))
 }
 
 #[tauri::command(async)]

tauri/src/lib.rs

@@ -146,8 +146,8 @@ fn register_commands<R: tauri::Runtime>(builder: tauri::Builder<R>) -> tauri::Bu
         // statistics
         statistics::total_distance,
         statistics::slope,
-        statistics::slope_segment_slope,
-        statistics::slope_segment_distance,
+        statistics::slope_segment_starts,
+        statistics::slope_segment_slopes,
         statistics::lng,
         statistics::lat,
         statistics::ele,
@@ -156,7 +156,7 @@ fn register_commands<R: tauri::Runtime>(builder: tauri::Builder<R>) -> tauri::Bu
         statistics::cad,
         statistics::atemp,
         statistics::power,
-        statistics::timestamps,
+        statistics::selection_point,
         statistics::selection_statistics,
         statistics::slice_statistics,
         statistics::surface_starts,

tauri/src/tests.rs

@@ -142,6 +142,18 @@ fn reads_the_statistics_of_the_selection() {
     // optional arrays start with a byte telling whether they are there
     let hr = app.bytes("hr", json!({}));
     assert_eq!(hr[0], 0);
+    // the slope segments are intervals of trackpoints
+    let starts = app.bytes("slope_segment_starts", json!({}));
+    let slopes = f64s(&app.bytes("slope_segment_slopes", json!({})));
+    assert_eq!(starts.len() / 4, slopes.len());
+    assert!(!slopes.is_empty() && slopes.len() < distance.len());
+    let point = app.call("selection_point", json!({ "index": 1 }));
+    assert!(point["slopeSegmentDistance"].is_number());
+    assert!(point.get("time").is_none());
+    assert_eq!(
+        app.call("selection_point", json!({ "index": distance.len() })),
+        Value::Null
+    );
     assert!(
         app.call("slice_statistics", json!({ "start": 1, "end": 3 }))["totalDistance"].is_number()
     );