65 lines
2.2 KiB
Go
65 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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"math"
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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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// 契约：等时线整条支路共用同一时刻，跨反经线时必须照样在两侧补出接缝点——否则换日线处会留下缺口。
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func TestSolarEclipseIsochroneMeetsAtAntimeridian(t *testing.T) {
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location := time.FixedZone("UTC+8", 8*3600)
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date := time.Date(2009, time.July, 22, 0, 0, 0, 0, location)
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level := time.Date(2009, time.July, 22, 11, 30, 0, 0, location) // 03:30 UT，正好跨反经线
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partial, ok := eclipse.SolarEclipsePartialFootprintsNASABulletinSplitK(date,
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eclipse.SolarEclipsePartialFootprintOptions{
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Step: 20 * time.Minute,
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BoundaryPoints: 24,
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DisableRiseSet: true,
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GreatestTimeValues: []time.Time{level},
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})
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if !ok {
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t.Fatal("expected the 2009-07-22 partial phase")
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}
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data, err := geojson.MarshalSolarEclipse(partial, 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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collection := decodeCollection(t, data)
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lines := featuresWithRole(collection, "greatest-time-line")
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if len(lines) != 1 {
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t.Fatalf("greatest-time-line features=%d, want 1", len(lines))
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}
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var coordinates [][][]float64
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if err := json.Unmarshal(lines[0].Geometry.Coordinates, &coordinates); err != nil {
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t.Fatalf("decode coordinates: %v", err)
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}
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if len(coordinates) != 2 {
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t.Fatalf("跨反经线的支路应拆成 2 段，得到 %d", len(coordinates))
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}
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east, west := coordinates[0], coordinates[1]
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if len(east) < 2 || len(west) < 2 {
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t.Fatal("段点数过少")
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}
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if last := east[len(east)-1]; math.Abs(last[0]+180) > 1e-9 {
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t.Fatalf("东段末点经度 %v，应为 −180", last[0])
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}
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if first := west[0]; math.Abs(first[0]-180) > 1e-9 {
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t.Fatalf("西段首点经度 %v，应为 +180", first[0])
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}
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if east[len(east)-1][1] != west[0][1] {
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t.Fatalf("接缝两侧纬度不同：%v vs %v", east[len(east)-1][1], west[0][1])
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}
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for index, segment := range coordinates {
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for point := 1; point < len(segment); point++ {
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if math.Abs(segment[point][0]-segment[point-1][0]) > 180 {
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t.Fatalf("段 %d 内仍有跨 180° 的边：%v → %v", index, segment[point-1], segment[point])
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}
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}
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}
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}
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