1 files changed, 17 insertions, 0 deletions
diff --git a/climb/route.go b/climb/route.go
index 80a9a43..4ef3465 100644
--- a/climb/route.go
+++ b/climb/route.go
@@ -7,3 +7,20 @@ type Route struct {
 	Elevations []float64
 	Coords     []geodist.Coord
 }
+
+// SegmentSample is a recorded passage: the length and elevation gain ridden between two route points.
+type SegmentSample struct {
+	DistanceM      float64
+	ElevationGainM float64
+}
+
+// Sample returns the recorded length and elevation gain of the route slice between start and end (inclusive), counting only upward steps in the gain.
+func (route Route) Sample(start, end int) SegmentSample {
+	sample := SegmentSample{DistanceM: route.Distances[end] - route.Distances[start]}
+	for i := start + 1; i <= end; i++ {
+		if diff := route.Elevations[i] - route.Elevations[i-1]; diff > 0 {
+			sample.ElevationGainM += diff
+		}
+	}
+	return sample
+}