53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
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package geojson_test
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import (
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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 TestSolarPartialEnvelopeCoversHorizonCurves(t *testing.T) {
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for _, date := range []time.Time{
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time.Date(43, 3, 29, 0, 0, 0, 0, time.UTC),
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time.Date(1848, 9, 27, 0, 0, 0, 0, time.UTC),
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time.Date(2023, 4, 20, 0, 0, 0, 0, time.UTC),
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time.Date(2025, 3, 29, 0, 0, 0, 0, time.UTC),
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} {
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t.Run(date.Format("2006-01-02"), func(t *testing.T) {
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path, ok := eclipse.SolarEclipsePartialFootprints(date, eclipse.SolarEclipsePartialFootprintOptions{
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Step: 5 * time.Minute, BoundaryPoints: 96, CentralShadowStep: 5 * time.Minute, RiseSetStep: 2 * time.Minute,
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})
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if !ok {
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t.Fatal("missing eclipse")
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}
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data, err := geojson.MarshalSolarEclipse(path, nil)
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if err != nil {
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t.Fatal(err)
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}
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collection := decodeCollection(t, data)
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band := featureWithRole(t, collection, "partial-band")
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if source := band.Properties["source"]; source != "zero-magnitude-envelope+horizon-boundary" {
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t.Fatalf("incomplete envelope fallback: %v", source)
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}
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assertClosedMultiPolygon(t, band)
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rings := geoJSONMultiPolygonOuterRings(t, band)
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var lines [][]geodata.GeoPoint
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for _, curve := range path.RiseSetCurves {
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for _, segment := range curve.Segments {
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line := make([]geodata.GeoPoint, len(segment))
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for i, point := range segment {
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line[i] = geodata.GeoPoint{Longitude: point.Longitude, Latitude: point.Latitude}
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}
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lines = append(lines, line)
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}
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}
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if miss := geodata.SphericalPolygonsPathMissDistanceKM(rings, lines, false); miss > 2 {
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t.Fatalf("phase curves miss envelope by %.3f km", miss)
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}
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})
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}
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}
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