sparser data transfers

gpx-rs/src/api/dto.rs

@@ -527,6 +527,9 @@ impl TrackpointDetails {
 #[derive(Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct SelectionPoint {
+    /// Slope (%) at the trackpoint.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub slope: Option<f64>,
     /// ms since the epoch.
     #[serde(skip_serializing_if = "Option::is_none")]
     pub time: Option<f64>,

gpx-rs/src/api/queries.rs

@@ -153,7 +153,6 @@ buffers!(
     total_distance,
     elevation_gain,
     elevation_loss,
-    slope,
     lng,
     lat,
     ele
@@ -202,6 +201,7 @@ pub fn selection_point<H: History>(engine: &Engine<H>, index: usize) -> Option<S
     let segment = stats.slope_segments.at(index);
     let finite = |value: f64| value.is_finite().then_some(value);
     Some(SelectionPoint {
+        slope: finite(stats.slope[index]),
         time: stats
             .time
             .as_ref()