52 lines
1.8 KiB
Go
52 lines
1.8 KiB
Go
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package geojson_test
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import (
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"strings"
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"testing"
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"time"
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"b612.me/astro/eclipse"
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"b612.me/astro/geojson"
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"b612.me/astro/internal/geodata"
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)
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func TestSolarPolarBandPreservesContinuousEnvelope(t *testing.T) {
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for _, day := range [][3]int{
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{2003, 11, 23}, {2021, 12, 4}, {2039, 12, 15}, {2061, 10, 13}, {2981, 10, 19},
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} {
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date := time.Date(day[0], time.Month(day[1]), day[2], 0, 0, 0, 0, time.UTC)
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t.Run(date.Format("2006-01-02"), func(t *testing.T) {
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partial, ok := eclipse.SolarEclipsePartialFootprints(date, eclipse.SolarEclipsePartialFootprintOptions{
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Step: 2 * time.Minute, BoundaryPoints: 96, DisableRiseSet: true,
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})
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if !ok || len(partial.CentralBandSegments) != 1 {
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t.Fatal("missing continuous envelope")
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}
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central, ok := eclipse.SolarEclipseCentralPath(date, eclipse.SolarEclipsePathOptions{Step: 2 * time.Minute, TargetSpacingKM: 700})
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if !ok {
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t.Fatal("missing central path")
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}
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for _, path := range []*eclipse.SolarEclipsePath{nil, ¢ral} {
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data, err := geojson.MarshalSolarEclipse(partial, path)
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if err != nil {
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t.Fatal(err)
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}
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band := featureWithRole(t, decodeCollection(t, data), "central-band")
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source, _ := band.Properties["source"].(string)
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if !strings.Contains(source, "envelope") {
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t.Fatalf("continuous envelope replaced by %q", source)
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}
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rings := geoJSONMultiPolygonOuterRings(t, band)
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var centers []geodata.GeoPoint
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for _, point := range central.CenterLine {
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centers = append(centers, geodata.GeoPoint{Longitude: point.Longitude, Latitude: point.Latitude})
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}
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if miss := geodata.SphericalPolygonsPathMissDistanceKM(rings, [][]geodata.GeoPoint{centers}, false); miss > 2 {
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t.Fatalf("central band omits center line by %.3f km", miss)
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}
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assertClosedMultiPolygon(t, band)
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}
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})
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}
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}
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