388 lines
16 KiB
Go
388 lines
16 KiB
Go
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package occultationgeo
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import (
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"math"
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"testing"
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"time"
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"b612.me/astro/basic"
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"b612.me/astro/internal/geodata"
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)
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func TestHorizonConnectorTrimsSamplesOutsideExactEndpoints(t *testing.T) {
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for _, offset := range []float64{0, 177, -182} {
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var points []basic.OccultationPathPoint
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for _, longitude := range []float64{1, 0, 2, 3, 5, 4} {
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points = append(points, basic.OccultationPathPoint{Longitude: math.Remainder(longitude+offset, 360), Latitude: 0})
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}
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trimmed := trimHorizonConnectorSamples(points)
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want := []basic.OccultationPathPoint{points[0], points[2], points[3], points[5]}
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if len(trimmed) != len(want) {
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t.Fatalf("offset=%g retained %d points, want %d", offset, len(trimmed), len(want))
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}
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for i := range want {
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if trimmed[i] != want[i] {
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t.Fatalf("offset=%g vertex %d changed: got %+v want %+v", offset, i, trimmed[i], want[i])
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}
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}
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}
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}
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func TestHorizonConnectorSegmentsUsesHorizonClosureAndPhaseEndpoints(t *testing.T) {
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eventTime := time.Date(2025, time.July, 29, 0, 0, 0, 0, time.UTC)
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contactStart := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 0}
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contactEnd := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 2}
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phaseStart := basic.OccultationPathPoint{Time: eventTime.Add(time.Second), Longitude: -0.1, Latitude: 2}
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phaseGreatest := basic.OccultationPathPoint{Time: eventTime.Add(-time.Second), Longitude: -0.1, Latitude: 0}
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footprint := basic.OccultationFootprint{
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Boundaries: [][]basic.OccultationPathPoint{{
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contactStart,
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{Time: eventTime, Longitude: 4, Latitude: 1},
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contactEnd,
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}},
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Polygons: [][]basic.OccultationPathPoint{{
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contactStart,
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{Time: eventTime, Longitude: 4, Latitude: 1},
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contactEnd,
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{Time: eventTime, Longitude: 1, Latitude: 2},
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{Time: eventTime, Longitude: 1, Latitude: 1},
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{Time: eventTime, Longitude: 1, Latitude: 0},
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contactStart,
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}},
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}
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curves := []basic.OccultationRiseSetCurve{
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{
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Phase: basic.RiseSetPhaseStart, Direction: basic.RiseSetDirectionRise,
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Segments: [][]basic.OccultationPathPoint{{phaseStart, {Time: eventTime.Add(time.Minute), Longitude: -1, Latitude: 3}}},
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},
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{
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Phase: basic.RiseSetPhaseGreatest, Direction: basic.RiseSetDirectionRise,
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Segments: [][]basic.OccultationPathPoint{{phaseGreatest, {Time: eventTime.Add(time.Minute), Longitude: -1, Latitude: -1}}},
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},
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}
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connectors := HorizonConnectorSegments([]basic.OccultationFootprint{footprint}, curves)
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if len(connectors) != 1 {
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t.Fatalf("connectors=%d, want one", len(connectors))
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}
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points := connectors[0].Points
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if len(points) <= 4 {
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t.Fatalf("connector points=%d, want a densified horizon closure", len(points))
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}
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if points[0] != phaseStart || points[len(points)-1] != phaseGreatest {
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t.Fatalf("connector endpoints=(%+v, %+v), want phase endpoints (%+v, %+v)",
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points[0], points[len(points)-1], phaseStart, phaseGreatest)
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}
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for _, point := range points {
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if point.Longitude == 4 {
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t.Fatal("connector contains the contact-limb detour")
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}
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}
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}
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func TestSmoothHorizonConnectorJunctionsRemovesShortEndpointCorner(t *testing.T) {
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points := []basic.OccultationPathPoint{
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{Longitude: -49.9687087, Latitude: 22.7599834},
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{Longitude: -49.7995044, Latitude: 22.6531000},
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{Longitude: -49.8520050, Latitude: 22.4586340},
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{Longitude: -49.9043580, Latitude: 22.2641500},
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}
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cleaned := smoothHorizonConnectorJunctions(points)
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if len(cleaned) != len(points)-1 {
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t.Fatalf("cleaned point count=%d, want %d: %#v", len(cleaned), len(points)-1, cleaned)
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}
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if cleaned[0] != points[0] || cleaned[len(cleaned)-1] != points[len(points)-1] {
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t.Fatalf("connector endpoints changed: first=%+v last=%+v", cleaned[0], cleaned[len(cleaned)-1])
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}
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}
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func TestSmoothHorizonConnectorJunctionsKeepsBroadBend(t *testing.T) {
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points := []basic.OccultationPathPoint{
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{Longitude: 0, Latitude: 0},
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{Longitude: 0.2, Latitude: 0.1},
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{Longitude: 1.0, Latitude: 0.8},
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{Longitude: 2.0, Latitude: 1.8},
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}
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cleaned := smoothHorizonConnectorJunctions(points)
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if len(cleaned) != len(points) {
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t.Fatalf("broad physical bend was changed: got %d points, want %d", len(cleaned), len(points))
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}
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}
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func TestHorizonConnectorSegmentsSmoothsExactEndpointJunctions(t *testing.T) {
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cases := []struct {
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name string
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planet basic.OccultationPlanet
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start time.Time
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target time.Time
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}{
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{"venus-1027", basic.OccultationVenus, time.Date(1027, time.March, 13, 0, 0, 0, 0, time.UTC), time.Date(1027, time.March, 13, 22, 11, 50, 833970457, time.UTC)},
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{"saturn-2629", basic.OccultationSaturn, time.Date(2629, time.December, 30, 0, 0, 0, 0, time.UTC), time.Date(2629, time.December, 30, 18, 28, 18, 614121973, time.UTC)},
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}
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for _, sample := range cases {
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t.Run(sample.name, func(t *testing.T) {
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paths, err := basic.FindPlanetOccultationPaths(sample.start.Add(-12*time.Hour), sample.start.Add(36*time.Hour), sample.planet, basic.OccultationPathOptions{
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Step: 20 * time.Minute, TargetSpacingKM: 900, RiseSetStep: time.Minute,
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DisableFootprints: true, Algorithm: basic.OccultationPathAlgorithmExact,
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})
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if err != nil || len(paths) == 0 {
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t.Fatalf("FindPlanetOccultationPaths() paths=%d err=%v", len(paths), err)
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}
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path := paths[0]
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for _, candidate := range paths[1:] {
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if absDuration(candidate.Greatest.Time.Sub(sample.target)) < absDuration(path.Greatest.Time.Sub(sample.target)) {
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path = candidate
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}
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}
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curvesByBand := []struct {
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name string
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footprints []basic.OccultationFootprint
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curves []basic.OccultationRiseSetCurve
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}{
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{"partial", path.PartialBandFootprints, path.RiseSetCurves},
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{"total", path.TotalBandFootprints, path.TotalRiseSetCurves},
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}
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for _, band := range curvesByBand {
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for connectorIndex, connector := range HorizonConnectorSegments(band.footprints, band.curves) {
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for index := 1; index+1 < len(connector.Points); index++ {
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first, middle, last := connector.Points[index-1], connector.Points[index], connector.Points[index+1]
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turn := 180 - occultationTurnAngleDegrees(
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geodata.GeoPoint{Longitude: first.Longitude, Latitude: first.Latitude},
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geodata.GeoPoint{Longitude: middle.Longitude, Latitude: middle.Latitude},
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geodata.GeoPoint{Longitude: last.Longitude, Latitude: last.Latitude},
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)
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deviation := occultationProjectedPointLineDistanceKM(
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geodata.GeoPoint{Longitude: middle.Longitude, Latitude: middle.Latitude},
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geodata.GeoPoint{Longitude: first.Longitude, Latitude: first.Latitude},
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geodata.GeoPoint{Longitude: last.Longitude, Latitude: last.Latitude},
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)
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if turn >= 55 && deviation >= 5 && deviation <= 25 &&
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DistanceKM(first, middle) <= 75 && DistanceKM(middle, last) <= 75 && DistanceKM(first, last) <= 55 {
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t.Fatalf("%s connector %d retains short endpoint corner at %d: turn=%.1f deviation=%.1f points=%+v/%+v/%+v", band.name, connectorIndex, index, turn, deviation, first, middle, last)
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}
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}
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}
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}
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})
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}
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}
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func TestHorizonConnectorSegmentsSkipsSamePhaseFoldBranches(t *testing.T) {
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eventTime := time.Date(2025, time.July, 29, 0, 0, 0, 0, time.UTC)
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contactStart := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 0}
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contactEnd := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 1}
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terminal := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 0.5}
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footprint := basic.OccultationFootprint{
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Boundaries: [][]basic.OccultationPathPoint{{
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contactStart,
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{Time: eventTime, Longitude: 2, Latitude: 0.5},
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contactEnd,
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}},
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Polygons: [][]basic.OccultationPathPoint{{
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contactStart,
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{Time: eventTime, Longitude: 2, Latitude: 0.5},
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contactEnd,
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{Time: eventTime, Longitude: 1, Latitude: 1},
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{Time: eventTime, Longitude: 1, Latitude: 0},
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contactStart,
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}},
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}
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curves := []basic.OccultationRiseSetCurve{{
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Phase: basic.RiseSetPhaseEnd, Direction: basic.RiseSetDirectionRise,
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Segments: [][]basic.OccultationPathPoint{
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{terminal, {Time: eventTime.Add(time.Minute), Longitude: 1, Latitude: 1}},
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{terminal, {Time: eventTime.Add(time.Minute), Longitude: -1, Latitude: 1}},
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},
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}}
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connectors := HorizonConnectorSegments([]basic.OccultationFootprint{footprint}, curves)
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if len(connectors) != 0 {
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t.Fatalf("connectors=%d, want no duplicate terminal closure", len(connectors))
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}
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}
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func TestHorizonConnectorSegmentsSkipsCoincidentDifferentPhaseEndpoints(t *testing.T) {
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eventTime := time.Date(2025, time.July, 29, 0, 0, 0, 0, time.UTC)
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contactStart := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 0}
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contactEnd := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 1}
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shared := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 0.5}
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footprint := basic.OccultationFootprint{
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Boundaries: [][]basic.OccultationPathPoint{{
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contactStart,
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{Time: eventTime, Longitude: 2, Latitude: 0.5},
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contactEnd,
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}},
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Polygons: [][]basic.OccultationPathPoint{{
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contactStart,
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{Time: eventTime, Longitude: 2, Latitude: 0.5},
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contactEnd,
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{Time: eventTime, Longitude: 1, Latitude: 1},
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shared,
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{Time: eventTime, Longitude: 1, Latitude: 0},
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contactStart,
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}},
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}
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curves := []basic.OccultationRiseSetCurve{
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{Phase: basic.RiseSetPhaseStart, Direction: basic.RiseSetDirectionRise,
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Segments: [][]basic.OccultationPathPoint{{shared, {Time: eventTime.Add(time.Minute), Longitude: -1, Latitude: 1}}}},
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{Phase: basic.RiseSetPhaseGreatest, Direction: basic.RiseSetDirectionRise,
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Segments: [][]basic.OccultationPathPoint{{shared, {Time: eventTime.Add(time.Minute), Longitude: -1, Latitude: -1}}}},
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}
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if connectors := HorizonConnectorSegments([]basic.OccultationFootprint{footprint}, curves); len(connectors) != 0 {
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t.Fatalf("connectors=%d, want no zero-length phase pinch loop", len(connectors))
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}
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}
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func TestHorizonConnectorSegmentsClosesSamePhaseSeparatedBranchOpening(t *testing.T) {
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eventTime := time.Date(2025, time.July, 29, 0, 0, 0, 0, time.UTC)
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contactStart := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 0}
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contactEnd := basic.OccultationPathPoint{Time: eventTime, Longitude: 0, Latitude: 3}
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branchStart := basic.OccultationPathPoint{Time: eventTime, Longitude: -0.05, Latitude: 0}
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branchEnd := basic.OccultationPathPoint{Time: eventTime, Longitude: -0.05, Latitude: 3}
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footprint := basic.OccultationFootprint{
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Boundaries: [][]basic.OccultationPathPoint{{
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contactStart,
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{Time: eventTime, Longitude: 2, Latitude: 1.5},
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contactEnd,
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}},
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Polygons: [][]basic.OccultationPathPoint{{
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contactStart,
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{Time: eventTime, Longitude: 2, Latitude: 1.5},
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contactEnd,
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{Time: eventTime, Longitude: 1, Latitude: 3},
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{Time: eventTime, Longitude: 1, Latitude: 0},
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contactStart,
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}},
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}
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curves := []basic.OccultationRiseSetCurve{{
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Phase: basic.RiseSetPhaseStart, Direction: basic.RiseSetDirectionRise,
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Segments: [][]basic.OccultationPathPoint{
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{branchStart, {Time: eventTime.Add(time.Minute), Longitude: -1, Latitude: -1}},
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{branchEnd, {Time: eventTime.Add(time.Minute), Longitude: -1, Latitude: 4}},
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},
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}}
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connectors := HorizonConnectorSegments([]basic.OccultationFootprint{footprint}, curves)
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if len(connectors) != 1 {
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t.Fatalf("connectors=%d, want one same-phase branch-opening closure", len(connectors))
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}
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points := connectors[0].Points
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if len(points) <= 4 {
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t.Fatalf("connector points=%d, want a densified horizon closure", len(points))
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}
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if !sameTestOccultationPoint(points[0], branchEnd) || !sameTestOccultationPoint(points[len(points)-1], branchStart) {
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t.Fatalf("connector endpoints=(%+v, %+v), want same-phase branch endpoints (%+v, %+v)",
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points[0], points[len(points)-1], branchEnd, branchStart)
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}
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}
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func TestHorizonConnectorSegmentsClosesShortTemporalHorizonGap(t *testing.T) {
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startTime := time.Date(2023, time.September, 21, 10, 1, 49, 0, time.UTC)
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endTime := startTime.Add(time.Minute)
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start := basic.OccultationPathPoint{Time: startTime, Longitude: 10, Latitude: 20}
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end := basic.OccultationPathPoint{Time: endTime, Longitude: 10.2, Latitude: 20.1}
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farStart := basic.OccultationPathPoint{Time: startTime, Longitude: 30, Latitude: 20}
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farEnd := basic.OccultationPathPoint{Time: endTime, Longitude: 30, Latitude: 20}
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footprints := []basic.OccultationFootprint{
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{
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Time: startTime,
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Boundaries: [][]basic.OccultationPathPoint{{start, farStart}},
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Polygons: [][]basic.OccultationPathPoint{{
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start, farStart,
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{Time: startTime, Longitude: 30, Latitude: 19},
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{Time: startTime, Longitude: 10, Latitude: 19}, start,
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}},
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},
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{
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Time: endTime,
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Boundaries: [][]basic.OccultationPathPoint{{end, farEnd}},
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Polygons: [][]basic.OccultationPathPoint{{
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end, farEnd,
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{Time: endTime, Longitude: 30, Latitude: 19},
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{Time: endTime, Longitude: 10.2, Latitude: 19}, end,
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}},
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|
},
|
||
|
|
}
|
||
|
|
curves := []basic.OccultationRiseSetCurve{
|
||
|
|
{
|
||
|
|
Phase: basic.RiseSetPhaseStart, Direction: basic.RiseSetDirectionSet,
|
||
|
|
Segments: [][]basic.OccultationPathPoint{{
|
||
|
|
{Time: startTime.Add(-10 * time.Minute), Longitude: 0, Latitude: 30}, start,
|
||
|
|
}},
|
||
|
|
},
|
||
|
|
{
|
||
|
|
Phase: basic.RiseSetPhaseEnd, Direction: basic.RiseSetDirectionSet,
|
||
|
|
Segments: [][]basic.OccultationPathPoint{{
|
||
|
|
end, {Time: endTime.Add(10 * time.Minute), Longitude: 0, Latitude: 30},
|
||
|
|
}},
|
||
|
|
},
|
||
|
|
}
|
||
|
|
|
||
|
|
if connectors := HorizonConnectorSegments(footprints, curves); len(connectors) != 0 {
|
||
|
|
t.Fatalf("finite-disk connectors=%d, want no point-source temporal connector", len(connectors))
|
||
|
|
}
|
||
|
|
connectors := StarHorizonConnectorSegments(footprints, curves)
|
||
|
|
if len(connectors) != 1 {
|
||
|
|
t.Fatalf("connectors=%d, want one temporal horizon connector", len(connectors))
|
||
|
|
}
|
||
|
|
points := connectors[0].Points
|
||
|
|
if len(points) < 2 || points[0] != start || points[len(points)-1] != end {
|
||
|
|
t.Fatalf("connector endpoints=%+v -> %+v, want %+v -> %+v",
|
||
|
|
points[0], points[len(points)-1], start, end)
|
||
|
|
}
|
||
|
|
for index := 1; index < len(points); index++ {
|
||
|
|
if !points[index].Time.After(points[index-1].Time) {
|
||
|
|
t.Fatalf("connector time is not strictly increasing at %d", index)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func TestHorizonConnectorSegmentsMars20250729OneMinuteRiseSetStepKeepsOpeningClosure(t *testing.T) {
|
||
|
|
zone := time.FixedZone("UTC+8", 8*60*60)
|
||
|
|
start := time.Date(2025, time.July, 29, 0, 0, 0, 0, zone)
|
||
|
|
paths, err := basic.FindPlanetOccultationPaths(
|
||
|
|
start, start.Add(24*time.Hour), basic.OccultationMars,
|
||
|
|
basic.OccultationPathOptions{
|
||
|
|
Step: 20 * time.Minute, TargetSpacingKM: 900, RiseSetStep: time.Minute,
|
||
|
|
DisableFootprints: true, IncludeFootprintTimeline: true,
|
||
|
|
FootprintTimelineStep: 5 * time.Minute,
|
||
|
|
},
|
||
|
|
)
|
||
|
|
if err != nil || len(paths) != 1 {
|
||
|
|
t.Fatalf("FindPlanetOccultationPaths() paths=%d err=%v, want one", len(paths), err)
|
||
|
|
}
|
||
|
|
connectors := HorizonConnectorSegments(paths[0].PartialBandFootprints, paths[0].RiseSetCurves)
|
||
|
|
foundOpening := false
|
||
|
|
for _, connector := range connectors {
|
||
|
|
if connector.Direction != basic.RiseSetDirectionRise || len(connector.Points) < 2 {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
first := connector.Points[0]
|
||
|
|
last := connector.Points[len(connector.Points)-1]
|
||
|
|
if !mars20250729OpeningFoldEndpoint(first) || !mars20250729OpeningFoldEndpoint(last) {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
chord := DistanceKM(first, last)
|
||
|
|
if chord < 250 || chord > 650 {
|
||
|
|
t.Fatalf("opening connector chord %.1f km, want the missing same-phase branch gap", chord)
|
||
|
|
}
|
||
|
|
foundOpening = true
|
||
|
|
break
|
||
|
|
}
|
||
|
|
if !foundOpening {
|
||
|
|
t.Fatal("2025-07-29 Mars one-minute rise/set curves are missing the opening horizon closure")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func sameTestOccultationPoint(first, second basic.OccultationPathPoint) bool {
|
||
|
|
return first.Time.Equal(second.Time) &&
|
||
|
|
first.Longitude == second.Longitude &&
|
||
|
|
first.Latitude == second.Latitude
|
||
|
|
}
|
||
|
|
|
||
|
|
func mars20250729OpeningFoldEndpoint(point basic.OccultationPathPoint) bool {
|
||
|
|
return point.Longitude >= -128.5 && point.Longitude <= -126 &&
|
||
|
|
point.Latitude >= -48.5 && point.Latitude <= -42
|
||
|
|
}
|