progress

gpx-rs/src/statistics.rs

@@ -1,13 +1,15 @@
 use crate::{
+    algorithms::ramer_douglas_peucker,
+    for_each_window,
     gpx::{LngLat, LngLatBounds, TrackPoint, TrackPointChunk},
-    utils::{distance, speed},
+    utils::{distance, slope, speed},
 };
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 pub struct GPXStatistics {
     pub total_distance: f64,
-    pub moving_distance: f64,
-    pub moving_time: i64,
+    pub moving_distance: Option<f64>,
+    pub moving_time: Option<i64>,
     pub elevation_gain: f64,
     pub elevation_loss: f64,
     pub start_time: Option<i64>,
@@ -17,6 +19,39 @@ pub struct GPXStatistics {
 }
 
 impl GPXStatistics {
+    pub fn total_time(&self) -> Option<i64> {
+        self.start_time.zip(self.end_time).map(|(t1, t2)| t2 - t1)
+    }
+
+    pub fn total_speed(&self) -> Option<f64> {
+        self.total_time().map(|t| speed(self.total_distance, t))
+    }
+
+    pub fn moving_speed(&self) -> Option<f64> {
+        self.moving_distance
+            .zip(self.moving_time)
+            .map(|(d, t)| speed(d, t))
+    }
+
+    pub fn compute(chunk: &TrackPointChunk) -> Self {
+        let mut stats = Self::default();
+        if chunk.trkpt.is_empty() {
+            return stats;
+        }
+
+        let mut prev = &chunk.trkpt[0];
+        for i in 0..chunk.trkpt.len() {
+            let cur = &chunk.trkpt[i];
+            stats.accumulate(prev, cur);
+            prev = cur;
+        }
+
+        stats.compute_smoothed_speed(chunk);
+        stats.compute_smoothed_elevation_gain(chunk);
+
+        stats
+    }
+
     fn accumulate(&mut self, prev: &TrackPoint, cur: &TrackPoint) {
         self.accumulate_distance_and_time(prev, cur);
         self.update_time_bounds(cur.time);
@@ -26,7 +61,7 @@ impl GPXStatistics {
     }
 
     fn accumulate_distance_and_time(&mut self, prev: &TrackPoint, cur: &TrackPoint) {
-        let dist = distance(&prev.coordinates, &cur.coordinates);
+        let dist = distance(prev.coordinates, cur.coordinates);
         let time = prev.time.zip(cur.time).map(|(t1, t2)| t2 - t1);
 
         self.total_distance += dist;
@@ -34,8 +69,8 @@ impl GPXStatistics {
         if let Some(time) = time {
             let speed = speed(dist, time);
             if speed >= 0.5 && speed <= 1500.0 {
-                self.moving_distance += dist;
-                self.moving_time += time;
+                self.moving_distance = self.moving_distance.map_or(Some(dist), |d| Some(d + dist));
+                self.moving_time = self.moving_time.map_or(Some(time), |t| Some(t + time));
             }
         }
     }
@@ -55,21 +90,139 @@ impl GPXStatistics {
         self.bounds.ne.lng = self.bounds.ne.lng.min(coordinates.lng);
         self.bounds.ne.lat = self.bounds.ne.lat.min(coordinates.lat);
     }
+
+    fn compute_smoothed_speed(&mut self, chunk: &TrackPointChunk) {
+        for_each_window!(
+            0,
+            chunk.trkpt.len(),
+            Some(10000),
+            |i, j| {
+                chunk.trkpt[i]
+                    .time
+                    .zip(chunk.trkpt[j].time)
+                    .map(|(t1, t2)| t2 - t1)
+            },
+            |i, left, right| {
+                self.local[i].speed =
+                    chunk.trkpt[left]
+                        .time
+                        .zip(chunk.trkpt[right].time)
+                        .map(|(t1, t2)| {
+                            speed(
+                                self.local[right].total_distance - self.local[left].total_distance,
+                                t2 - t1,
+                            )
+                        });
+            },
+        );
+    }
+
+    fn compute_smoothed_elevation_gain(&mut self, chunk: &TrackPointChunk) {
+        let simplified = ramer_douglas_peucker(
+            chunk.trkpt.len(),
+            &|i, j, k| {
+                let x1 = self.local[i].total_distance * 1000.0;
+                let x2 = self.local[j].total_distance * 1000.0;
+                let x3 = self.local[k].total_distance * 1000.0;
+                let y1 = chunk.trkpt[i].ele;
+                let y2 = chunk.trkpt[j].ele;
+                let y3 = chunk.trkpt[k].ele;
+
+                let dist = ((y2 - y1).powi(2) + (x2 - x1).powi(2)).sqrt();
+                if dist == 0.0 {
+                    ((x3 - x1).powi(2) + (y3 - y1).powi(2)).sqrt()
+                } else {
+                    ((y2 - y1) * x3 - (x2 - x1) * y3 + x2 * y1 - y2 * x1).abs() / dist
+                }
+            },
+            20.0,
+        );
+
+        for i in 0..(simplified.len() - 1) {
+            let start = simplified[i];
+            let end = simplified[i + 1];
+            let last = i + 1 == simplified.len() - 1;
+
+            let mut cumul_ele = 0.0;
+            let mut current_left = start;
+            let mut current_right = start;
+            let mut prev_smoothed_ele = chunk.trkpt[start].ele;
+
+            for_each_window!(
+                start,
+                end,
+                0.1,
+                |i, j| self.local[j].total_distance - self.local[i].total_distance,
+                |i, left, right| {
+                    for i in current_left..left {
+                        cumul_ele -= chunk.trkpt[i].ele;
+                    }
+                    for i in current_right..=right {
+                        cumul_ele += chunk.trkpt[i].ele;
+                    }
+                    current_left = left;
+                    current_right = right + 1;
+
+                    let smoothed_ele: f64 = if i == start || i == end {
+                        chunk.trkpt[i].ele
+                    } else {
+                        cumul_ele / (right - left + 1) as f64
+                    };
+
+                    let delta = smoothed_ele - prev_smoothed_ele;
+                    if delta > 0.0 {
+                        self.elevation_gain += delta;
+                    } else if delta < 0.0 {
+                        self.elevation_loss -= delta;
+                    }
+
+                    if i < end || last {
+                        self.local[i].elevation_gain = self.elevation_gain;
+                        self.local[i].elevation_loss = self.elevation_loss;
+                    }
+
+                    prev_smoothed_ele = smoothed_ele;
+                },
+            );
+
+            let segment_dist = self.local[end].total_distance - self.local[start].total_distance;
+            let segment_ele = chunk.trkpt[end].ele - chunk.trkpt[start].ele;
+            let segment_slope = slope(segment_ele, segment_dist);
+            for k in start..(end + last as usize) {
+                self.local[k].slope_segment = SlopeSegment {
+                    slope: segment_slope,
+                    distance: segment_dist,
+                };
+            }
+        }
+
+        for_each_window!(
+            0,
+            chunk.trkpt.len(),
+            0.05,
+            |i, j| self.local[j].total_distance - self.local[i].total_distance,
+            |i, left, right| {
+                let dist = self.local[right].total_distance - self.local[left].total_distance;
+                let ele = chunk.trkpt[right].ele - chunk.trkpt[left].ele;
+                self.local[i].slope = slope(ele, dist);
+            },
+        );
+    }
 }
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 pub struct SlopeSegment {
     pub slope: f64,
     pub distance: f64,
 }
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 pub struct TrackpointStatistics {
     pub total_distance: f64,
-    pub moving_distance: f64,
-    pub total_time: i64,
-    pub moving_time: i64,
-    pub speed: f64,
+    pub moving_distance: Option<f64>,
+    pub total_time: Option<i64>,
+    pub moving_time: Option<i64>,
+    pub speed: Option<f64>,
     pub elevation_gain: f64,
     pub elevation_loss: f64,
     pub slope: f64,
@@ -81,12 +234,9 @@ impl TrackpointStatistics {
         Self {
             total_distance: stats.total_distance,
             moving_distance: stats.moving_distance,
-            total_time: stats
-                .start_time
-                .zip(stats.end_time)
-                .map_or(0, |(t1, t2)| t2 - t1),
+            total_time: stats.start_time.zip(stats.end_time).map(|(t1, t2)| t2 - t1),
             moving_time: stats.moving_time,
-            speed: todo!(),
+            speed: None,
             elevation_gain: stats.elevation_gain,
             elevation_loss: stats.elevation_loss,
             slope: Default::default(),
@@ -95,19 +245,24 @@ impl TrackpointStatistics {
     }
 }
 
-impl GPXStatistics {
-    pub fn compute(chunk: &TrackPointChunk) -> Self {
-        let mut stats = Self::default();
-        if chunk.trkpt.is_empty() {
-            return stats;
-        }
+#[cfg(test)]
+mod tests {
+    use std::{fs::File, io::Read};
 
-        let mut prev = &chunk.trkpt[0];
-        for i in 0..chunk.trkpt.len() {
-            let cur = &chunk.trkpt[i];
-            stats.accumulate(prev, cur);
-            prev = cur;
-        }
-        stats
+    use crate::actions::parse;
+
+    use super::*;
+
+    #[test]
+    fn test_parse_simple() {
+        let mut f = File::open("data/with_time.gpx").unwrap();
+        let mut data = String::new();
+        let _ = f.read_to_string(&mut data);
+        let gpx = parse(data.as_bytes()).unwrap();
+
+        println!(
+            "{:?}",
+            GPXStatistics::compute(&gpx.trk[0].trkseg[0].chunks[0])
+        );
     }
 }