59 lines
2.2 KiB
Go
59 lines
2.2 KiB
Go
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package geojson_test
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import (
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"encoding/json"
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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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)
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// A one-limit polar total eclipse has U1/U4 samples while the axis is still
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// below the horizon. Those open samples must not flare the static central band
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// beyond the central-line interval.
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func TestMarshalSolarEclipse15220327ClipsOneLimitEndSweeps(t *testing.T) {
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date := time.Date(1522, time.March, 27, 0, 0, 0, 0, time.UTC)
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partial, ok := eclipse.SolarEclipsePartialFootprints(date, eclipse.SolarEclipsePartialFootprintOptions{
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Step: 2 * time.Minute, BoundaryPoints: 96, RiseSetStep: 2 * time.Minute,
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})
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if !ok {
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t.Fatal("expected solar eclipse footprints")
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}
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central, ok := eclipse.SolarEclipseCentralPath(date, eclipse.SolarEclipsePathOptions{
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Step: 2 * time.Minute, TargetSpacingKM: 150,
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})
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if !ok || central.Eclipse.Centrality != eclipse.SolarEclipseCentralOneLimit {
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t.Fatalf("expected one-limit central path, got ok=%v centrality=%s", ok, central.Eclipse.Centrality)
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}
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if len(central.CenterLine) < 2 || len(partial.CentralBandFootprints) == 0 {
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t.Fatal("missing central path or end footprints")
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}
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first := partial.CentralBandFootprints[0]
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if !first.Time.Before(central.CenterLine[0].Time) || len(first.Boundaries) == 0 || len(first.Boundaries[0]) == 0 {
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t.Fatal("fixture no longer exercises a pre-horizon end footprint")
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}
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data, err := geojson.MarshalSolarEclipse(partial, ¢ral)
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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), "central-band")
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for _, point := range first.Boundaries[0] {
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if geometryContainsPoint(t, band.Geometry, point.Longitude, point.Latitude) {
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t.Fatalf("central band includes pre-horizon footprint point %.6f, %.6f", point.Longitude, point.Latitude)
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}
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}
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var lines [][][]float64
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center := featureWithRole(t, decodeCollection(t, data), "center-line")
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if err := json.Unmarshal(center.Geometry.Coordinates, &lines); err != nil {
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t.Fatal(err)
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}
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for _, line := range lines {
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for _, point := range line {
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if !geometryContainsPoint(t, band.Geometry, point[0], point[1]) {
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t.Fatalf("central band omits center-line point %.6f, %.6f", point[0], point[1])
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}
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}
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}
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}
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