49 lines
1.7 KiB
Go
49 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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// 3288-11-16 in the local display falls on 3288-11-15 UTC. It is an
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// extremely shallow non-central eclipse: the sampled footprints are open,
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// while the rise/set phase tracks still form part of the visible envelope.
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func TestMarshalSolarEclipse32881115FallbackCoversPhaseTracks(t *testing.T) {
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path, ok := eclipse.SolarEclipsePartialFootprints(
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time.Date(3288, time.November, 15, 0, 0, 0, 0, time.UTC),
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eclipse.SolarEclipsePartialFootprintOptions{
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Step: 5 * time.Minute, BoundaryPoints: 96,
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CentralShadowStep: 5 * time.Minute, RiseSetStep: 2 * time.Minute,
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},
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)
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if !ok {
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t.Fatal("expected 3288-11-15 UTC solar eclipse")
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}
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if len(path.PartialBandContours) == 0 || len(path.RiseSetCurves) == 0 {
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t.Fatalf("unexpected topology: contours=%d curves=%d", len(path.PartialBandContours), len(path.RiseSetCurves))
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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.Fatalf("MarshalSolarEclipse: %v", err)
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}
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band := featureWithRole(t, decodeCollection(t, data), "partial-band")
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rings := geoJSONMultiPolygonOuterRings(t, band)
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lines := make([][]geodata.GeoPoint, 0, len(path.RiseSetCurves)*2)
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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 index, point := range segment {
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line[index] = 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("fallback partial-band misses phase tracks by %.1f km", miss)
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}
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}
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