49 lines
1.8 KiB
Go
49 lines
1.8 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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func TestMarshalSolarEclipse20611013TangentCentralBandAvoidsAxisEndpointCap(t *testing.T) {
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date := time.Date(2061, 10, 13, 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, CentralShadowStep: 2 * 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.SolarEclipseAnnular ||
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partial.Eclipse.Centrality != eclipse.SolarEclipseCentralTwoLimits {
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t.Fatalf("unexpected event: ok=%v type=%s centrality=%s", ok, partial.Eclipse.Type, partial.Eclipse.Centrality)
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}
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central, ok := eclipse.SolarEclipseCentralPath(date, eclipse.SolarEclipsePathOptions{
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Step: 2 * time.Minute, TargetSpacingKM: 700,
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})
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if !ok {
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t.Fatal("expected 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.Fatalf("MarshalSolarEclipse: %v", 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" {
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t.Fatalf("central-band source=%v, want a validated continuous central band", 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.Fatalf("decode central band: %v", err)
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}
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if len(polygons) != 1 || len(polygons[0]) == 0 {
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t.Fatalf("central-band polygons=%d, want one exterior ring", len(polygons))
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}
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ring := polygons[0][0]
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if len(ring) < 20 {
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t.Fatalf("central-band ring points=%d, want a spatially refined envelope", len(ring))
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}
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assertSolarCentralBandRingSimpleAndSampled(t, ring, 250)
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}
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