64 lines
2.3 KiB
Go
64 lines
2.3 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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"b612.me/astro/internal/geodata"
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)
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func TestMarshalSolarEclipse25441017PreservesHybridEnvelopeComponents(t *testing.T) {
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date := time.Date(2544, 10, 17, 0, 0, 0, 0, time.UTC)
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partial, ok := eclipse.SolarEclipsePartialFootprints(date, eclipse.SolarEclipsePartialFootprintOptions{
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Step: 5 * time.Minute,
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BoundaryPoints: 96,
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CentralShadowStep: 5 * time.Minute,
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RiseSetStep: 5 * time.Minute,
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MagnitudeValues: []float64{0.2, 0.4, 0.6, 0.8, 1},
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})
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if !ok || partial.Eclipse.Type != eclipse.SolarEclipseHybrid || len(partial.CentralBandSegments) != 3 {
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t.Fatalf("unexpected hybrid envelope: ok=%v type=%s segments=%d", ok, partial.Eclipse.Type, len(partial.CentralBandSegments))
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}
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central, ok := eclipse.SolarEclipseCentralPath(date, eclipse.SolarEclipsePathOptions{
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Step: 5 * time.Minute, TargetSpacingKM: 700,
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})
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if !ok {
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t.Fatal("missing hybrid central path")
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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.Fatal(err)
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}
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band := featureWithRole(t, decodeCollection(t, data), "central-band")
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if source := band.Properties["source"]; source != "besselian-critical-envelope-components" && source != "besselian-critical-envelope" {
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t.Fatalf("central band source=%v, want critical envelope", source)
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}
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var polygons [][][][]float64
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if err := json.Unmarshal(band.Geometry.Coordinates, &polygons); err != nil {
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t.Fatal(err)
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}
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if len(polygons) < 3 {
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t.Fatalf("central band polygons=%d, want at least three physical components", len(polygons))
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}
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for polygonIndex, polygon := range polygons {
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if len(polygon) != 1 {
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t.Fatalf("central band polygon %d rings=%d, want one", polygonIndex, len(polygon))
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}
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assertSolarCentralBandRingSimpleAndSampled(t, polygon[0], 250)
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}
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var sourceRings [][]geodata.GeoPoint
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for _, segment := range partial.CentralBandSegments {
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var ring []geodata.GeoPoint
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for _, point := range segment {
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ring = append(ring, geodata.GeoPoint{Longitude: point.Longitude, Latitude: point.Latitude})
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}
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sourceRings = append(sourceRings, ring)
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}
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if miss := geodata.SphericalPolygonsPathMissDistanceKM(geoJSONMultiPolygonOuterRings(t, band), sourceRings, true); miss > 1 {
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t.Fatalf("hybrid components leave the exported band by %.3f km", miss)
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}
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}
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