Skip spatial force below display threshold

src/app.rs

@@ -25,6 +25,7 @@ use std::{
 const SUMMARY_POINTS_PER_SERIES: usize = 42;
 const HAND_FORCE_PANEL_COUNT: usize = 7;
 const HAND_FORCE_SEGMENT_COUNTS: [usize; HAND_FORCE_PANEL_COUNT] = [84, 84, 84, 84, 84, 70, 44];
+const HAND_FORCE_DISPLAY_THRESHOLD_N: f32 = 0.05;
 const HAND_IMAGE_SIZE_PX: [f32; 2] = [971.0, 1117.0];
 const HAND_FINGERTIP_FORCE_ANCHORS_PX: [[f32; 2]; HAND_FINGERTIP_COUNT] = [
     [265.0, 495.0],
@@ -246,7 +247,12 @@ impl EskinDesktopApp {
 
     fn analyze_spatial_force(&mut self, values: &[u32]) {
         if matches!(self.config_state.mode, SerialMode::Hand) {
-            self.latest_hand_spatial_forces = self.force_estimator.analyze_fingertips(values);
+            let enabled = std::array::from_fn(|tip_index| {
+                hand_segment_force(values, tip_index) > HAND_FORCE_DISPLAY_THRESHOLD_N
+            });
+            self.latest_hand_spatial_forces = self
+                .force_estimator
+                .analyze_fingertips_masked(values, &enabled);
             self.latest_spatial_force = self.strongest_hand_spatial_force();
         } else {
             self.latest_spatial_force = self.force_estimator.analyze(values);
@@ -707,33 +713,42 @@ fn update_hand_signal_histories(
     histories: &mut [Vec<f32>; HAND_FORCE_PANEL_COUNT],
     raw_values: &[u32],
 ) -> f32 {
-    let mut offset = 0usize;
     let mut total_force = 0.0;
-    for (index, (history, sample_count)) in histories
-        .iter_mut()
-        .zip(HAND_FORCE_SEGMENT_COUNTS)
-        .enumerate()
-    {
-        let raw_total = raw_values
-            .get(offset..offset + sample_count)
-            .unwrap_or(&[])
-            .iter()
-            .fold(0_u64, |sum, value| sum + *value as u64)
-            .min(u32::MAX as u64) as u32;
-        let force = raw_to_hand_segment_g(index, raw_total).min(20.6);
-        let force = if force <= 0.05 { 0.0 } else { force };
+    for (index, history) in histories.iter_mut().enumerate() {
+        let force = hand_segment_force(raw_values, index);
+        let force = if force <= HAND_FORCE_DISPLAY_THRESHOLD_N {
+            0.0
+        } else {
+            force
+        };
         total_force += force;
         history.push(force);
         if history.len() > SUMMARY_POINTS_PER_SERIES {
             history.remove(0);
         }
-
-        offset += sample_count;
     }
 
     total_force
 }
 
+fn hand_segment_force(raw_values: &[u32], index: usize) -> f32 {
+    let offset: usize = HAND_FORCE_SEGMENT_COUNTS[..index.min(HAND_FORCE_PANEL_COUNT)]
+        .iter()
+        .sum();
+    let sample_count = HAND_FORCE_SEGMENT_COUNTS
+        .get(index)
+        .copied()
+        .unwrap_or_default();
+    let raw_total = raw_values
+        .get(offset..offset + sample_count)
+        .unwrap_or(&[])
+        .iter()
+        .fold(0_u64, |sum, value| sum + *value as u64)
+        .min(u32::MAX as u64) as u32;
+
+    raw_to_hand_segment_g(index, raw_total).min(20.6)
+}
+
 fn raw_to_hand_segment_g(index: usize, raw: u32) -> f32 {
     match index {
         0 => raw_to_g1(raw),

src/force.rs

@@ -50,10 +50,22 @@ impl ForceEstimatorState {
     pub fn analyze_fingertips(
         &mut self,
         values: &[u32],
+    ) -> [Option<HudSpatialForce>; HAND_FINGERTIP_COUNT] {
+        self.analyze_fingertips_masked(values, &[true; HAND_FINGERTIP_COUNT])
+    }
+
+    pub fn analyze_fingertips_masked(
+        &mut self,
+        values: &[u32],
+        enabled: &[bool; HAND_FINGERTIP_COUNT],
     ) -> [Option<HudSpatialForce>; HAND_FINGERTIP_COUNT] {
         let mut forces = [None; HAND_FINGERTIP_COUNT];
 
         for (tip_index, processor) in self.fingertip_processors.iter_mut().enumerate() {
+            if !enabled[tip_index] {
+                continue;
+            }
+
             let start = tip_index * FINGER_SAMPLE_COUNT;
             let end = start + FINGER_SAMPLE_COUNT;
             let Some(segment) = values.get(start..end) else {