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package ride
import (
"fmt"
"log/slog"
"math"
"slices"
"time"
"github.com/jftuga/geodist"
"github.com/martinlehoux/kagamigo/kcore"
)
const ClimbDistanceMinimum = 500
// Category is the difficulty class of a climb, ordered from easiest to
// hardest.
type Category int
const (
CategoryNo Category = iota
CategoryFour
CategoryThree
CategoryTwo
CategoryOne
CategoryHC
)
type categoryInfo struct {
label string
maxScore float64
}
// categories describes each Category: its display label and the exclusive
// Cotacol score ceiling it applies to. A score at or above CategoryOne's
// ceiling is Hors Catégorie.
var categories = map[Category]categoryInfo{
CategoryNo: {label: "NO", maxScore: 35},
CategoryFour: {label: "Cat 4", maxScore: 80},
CategoryThree: {label: "Cat 3", maxScore: 180},
CategoryTwo: {label: "Cat 2", maxScore: 250},
CategoryOne: {label: "Cat 1", maxScore: 600},
// Hors Catégorie has no ceiling.
CategoryHC: {label: "HC", maxScore: math.Inf(+1)},
}
// climbDetectionMinimumScore is the climb-detection score below which a
// candidate segment is not reported as a climb.
const climbDetectionMinimumScore = 35
type Climb struct {
ride Ride
rideStart int
rideEnd int
Name string
}
func (climb Climb) Duration() time.Duration {
return climb.ride.Timestamp(climb.rideEnd).Sub(climb.ride.Timestamp(climb.rideStart))
}
func (climb Climb) Speed() float64 {
return (climb.EndDistanceM() - climb.StartDistanceM()) / climb.Duration().Seconds()
}
func (climb Climb) StartIndex() int { return climb.rideStart }
func (climb Climb) EndIndex() int { return climb.rideEnd }
func (climb Climb) StartDistanceM() float64 {
return climb.ride.DistanceM(climb.rideStart)
}
func (climb Climb) EndDistanceM() float64 {
return climb.ride.DistanceM(climb.rideEnd)
}
func (climb Climb) StartCoord() geodist.Coord {
return climb.ride.Coord(climb.rideStart)
}
func (climb Climb) EndCoord() geodist.Coord {
return climb.ride.Coord(climb.rideEnd)
}
func (climb Climb) PointCoord(index int) geodist.Coord {
kcore.Assert(index >= climb.rideStart && index <= climb.rideEnd, "point is outside climb")
return climb.ride.Coord(index)
}
// TopIndex returns the highest point inside the climb, used as the crest anchor.
func (climb Climb) TopIndex() int {
top := climb.rideStart
for i := climb.rideStart; i <= climb.rideEnd; i++ {
if climb.ride.ElevationM(i) > climb.ride.ElevationM(top) {
top = i
}
}
return top
}
func (climb Climb) TopDistanceM() float64 {
return climb.ride.DistanceM(climb.TopIndex())
}
func (climb Climb) TopElevationM() float64 {
return climb.ride.ElevationM(climb.TopIndex())
}
func (climb Climb) TopCoord() geodist.Coord {
return climb.ride.Coord(climb.TopIndex())
}
func (climb Climb) String() string {
startDistance := climb.StartDistanceM()
endDistance := climb.EndDistanceM()
cotacol := climb.DifficultyScore()
body := fmt.Sprintf("%.1fkm-%.1fkm: %.1fkm at %.1f%% (%d pts - %s)", startDistance/1000, endDistance/1000, (endDistance-startDistance)/1000, Slope(climb.ride, climb.rideStart, climb.rideEnd)*100, int(cotacol), CategoryOf(cotacol))
if climb.Name == "" {
return body
}
return climb.Name + ": " + body
}
func (climb Climb) DifficultyScore() float64 {
return difficultyScore(climb.ride, climb.rideStart, climb.rideEnd)
}
func Slope(r Ride, start, end int) float64 {
return (r.ElevationM(end) - r.ElevationM(start)) / (r.DistanceM(end) - r.DistanceM(start))
}
func climbDetectionScore(r Ride, start, end int) float64 {
kcore.Assert(end > start, "no points for climb detection")
distance := r.DistanceM(end) - r.DistanceM(start)
if distance == 0 {
return 0
}
dElevation := r.ElevationM(end) - r.ElevationM(start)
return math.Abs(dElevation) * dElevation / distance * 100.0 * 100.0 / 1000.0
}
func (c Category) String() string {
return categories[c].label
}
// CategoryOf returns the difficulty class of a Cotacol score.
func CategoryOf(cotacol float64) Category {
best := CategoryHC
bestMax := math.Inf(+1)
for category, info := range categories {
if cotacol < info.maxScore && info.maxScore < bestMax {
best = category
bestMax = info.maxScore
}
}
return best
}
func bestClimbBetween(r Ride, start, end int) Climb {
kcore.Assert(end > start, "empty points")
bestDetectionScore := climbDetectionScore(r, start, end)
bestStart := start
for i := start; i < end; i++ {
detectionScore := climbDetectionScore(r, i, end)
if detectionScore > bestDetectionScore {
bestStart = i
bestDetectionScore = detectionScore
}
}
bestEnd := end
for i := end; i > bestStart; i-- {
detectionScore := climbDetectionScore(r, bestStart, i)
if detectionScore > bestDetectionScore {
bestEnd = i
bestDetectionScore = detectionScore
}
}
for i := bestStart; i < bestEnd; i++ {
detectionScore := climbDetectionScore(r, i, bestEnd)
if detectionScore > bestDetectionScore {
bestStart = i
bestDetectionScore = detectionScore
}
}
kcore.Assert(bestStart < bestEnd, "empty climb")
return Climb{ride: r, rideStart: bestStart, rideEnd: bestEnd}
}
func climbsBetween(r Ride, start, end int) []Climb {
climbs := []Climb{}
if r.DistanceM(end)-r.DistanceM(start) < ClimbDistanceMinimum {
return climbs
}
slog.Debug("Searching climbs between", slog.Int("start", int(r.DistanceM(start))), slog.Int("end", int(r.DistanceM(end))))
highest := start
for i := start; i <= end; i++ {
if r.ElevationM(i) > r.ElevationM(highest) {
highest = i
}
}
// TODO: Use descent to reduce recursion
if r.DistanceM(highest)-r.DistanceM(start) < ClimbDistanceMinimum {
return climbsBetween(r, start+1, end)
}
climb := bestClimbBetween(r, start, highest)
if climbDetectionScore(r, climb.rideStart, climb.rideEnd) >= climbDetectionMinimumScore && climb.EndDistanceM()-climb.StartDistanceM() >= ClimbDistanceMinimum {
slog.Debug("Found climb between", slog.Int("start", int(climb.StartDistanceM())), slog.Int("end", int(climb.EndDistanceM())))
climbs = append(climbs, climb)
}
climbs = append(climbs, climbsBetween(r, start, climb.rideStart)...)
climbs = append(climbs, climbsBetween(r, climb.rideEnd, end)...)
return climbs
}
func (ride *Ride) AllClimbs() []Climb {
climbs := climbsBetween(*ride, 0, ride.Len()-1)
slices.SortFunc(climbs, climbCmpStart)
return climbs
}
func climbCmpStart(a, b Climb) int { return a.rideStart - b.rideStart }
|
