77 lines
2.9 KiB
Go
77 lines
2.9 KiB
Go
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package basic
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import (
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"math"
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"testing"
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"time"
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)
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func TestOccultationBoundarySamplingNearTemporalFolds(t *testing.T) {
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for _, algorithm := range []OccultationPathAlgorithm{OccultationPathAlgorithmExact, OccultationPathAlgorithmOptimized} {
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t.Run(string(algorithm), func(t *testing.T) {
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day := time.Date(3627, 9, 20, 0, 0, 0, 0, time.UTC)
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paths, err := FindPlanetOccultationPaths(day.Add(-12*time.Hour), day.Add(36*time.Hour), OccultationJupiter,
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OccultationPathOptions{Algorithm: algorithm, Step: 20 * time.Minute, TargetSpacingKM: 900, DisableFootprints: true, RiseSetStep: time.Minute})
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if err != nil || len(paths) != 1 {
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t.Fatalf("paths=%d err=%v", len(paths), err)
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}
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for _, contours := range [][][]OccultationPathPoint{paths[0].PartialBandContours, paths[0].TotalBandContours} {
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for ci, contour := range contours {
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for i := 1; i+1 < len(contour); i++ {
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a, b, c := contour[i-1], contour[i], contour[i+1]
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first, second := occultationPathDistanceKM(a, b), occultationPathDistanceKM(b, c)
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if first > 0.05 && second > 0.05 && first+second > 2 && occultationRiseSetTurnAngleDegrees(a, b, c) < 30 {
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t.Errorf("contour %d point %d reverses between %.3f/%.3f km edges at %.9f,%.9f", ci, i, first, second, b.Longitude, b.Latitude)
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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 TestOccultationPhaseJunctionSamplingResolvesCurvature(t *testing.T) {
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day := time.Date(1227, 5, 19, 0, 0, 0, 0, time.UTC)
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paths, err := FindPlanetOccultationPaths(day.Add(-12*time.Hour), day.Add(36*time.Hour), OccultationVenus,
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OccultationPathOptions{Algorithm: OccultationPathAlgorithmExact, Step: 20 * time.Minute, TargetSpacingKM: 900, DisableFootprints: true, RiseSetStep: time.Minute})
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if err != nil || len(paths) != 1 {
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t.Fatalf("paths=%d err=%v", len(paths), err)
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}
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config, _ := planetOccultationConfigFor(OccultationVenus)
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cache := newPlanetOccultationEventCache(config)
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checked := 0
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for ci, curve := range paths[0].RiseSetCurves {
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if curve.Phase == RiseSetPhaseGreatest {
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continue
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}
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for _, segment := range curve.Segments {
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if len(segment) < 2 {
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continue
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}
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for _, atStart := range []bool{true, false} {
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endpoint := occultationRiseSetSegmentEndpoint(segment, atStart)
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if !occultationRiseSetEndpointSharesPhaseJunction(paths[0].RiseSetCurves, ci, endpoint) {
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continue
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}
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index := len(segment) - 2
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if atStart {
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index = 0
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}
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a, b := segment[index], segment[index+1]
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middle, ok := occultationRiseSetPhaseMidpoint(a, b, curve.Phase, curve.Direction, time.UTC, cache.riseSetCache)
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if !ok || occultationPathDistanceKM(a, b) < 0.05 {
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continue
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}
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checked++
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deviation := planetOccultationPointSegmentDistanceKM(middle, a, b)
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if math.IsNaN(deviation) || deviation > 0.05 {
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t.Errorf("%s/%s endpoint chord misses the physical arc by %.6f km", curve.Phase, curve.Direction, deviation)
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}
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}
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}
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}
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if checked < 2 {
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t.Fatalf("checked only %d junction chords", checked)
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}
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}
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