76 lines
2.8 KiB
Go
76 lines
2.8 KiB
Go
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package svg
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import (
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"html"
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"math"
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"regexp"
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"testing"
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"time"
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"b612.me/astro/basic"
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eclipsecore "b612.me/astro/eclipse"
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)
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// 详细版"食甚时的月亮（地心坐标）"块必须用食甚时刻的力学时求值，与 NASA 月食图同一时刻；
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// 输入日期的时刻（当天 0 时或 12 时）会让赤经赤纬整体偏掉。
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func TestLunarEclipseDetailedGeocentricBlockUsesGreatestEclipse(t *testing.T) {
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cst := time.FixedZone("CST", 8*3600)
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cases := []struct {
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name string
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date time.Time
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ra string
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dec string
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}{
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// 对应 NASA 图上的 Moon at Greatest Eclipse：2026-03-03 为 10h56m15.0s / +06°24'05.2"，
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// 2025-03-14 为 11h38m23.0s / +02°40'54.6"，与本库的差在 0.3 角秒内。
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{"2026-03-03", time.Date(2026, 3, 3, 0, 0, 0, 0, cst), "10h56m15.1s", "+06°24'05.2""},
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{"2025-03-14", time.Date(2025, 3, 14, 0, 0, 0, 0, cst), "11h38m23.0s", "+02°40'54.3""},
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}
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for _, want := range cases {
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doc, ok := LunarEclipseDetailedSVG(want.date, LunarEclipseDetailedSVGOptions{
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Language: "zh", Location: cst})
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if !ok {
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t.Fatalf("%s: missing chart", want.name)
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}
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ra, dec := lunarGeocentricMoonBlock(t, doc)
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if ra != want.ra || dec != want.dec {
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t.Errorf("%s: 食甚坐标 RA=%s Dec=%s, want RA=%s Dec=%s", want.name, ra, dec, want.ra, want.dec)
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}
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info, ok := eclipsecore.LunarEclipseOnDate(want.date)
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if !ok {
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t.Fatalf("%s: missing eclipse", want.name)
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}
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maximumRA, maximumDec := basic.HMoonTrueRaDec(timeToTTJDE(info.Maximum))
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if got, wantValue := ra, formatSolarEclipseRA(maximumRA); got != wantValue {
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t.Errorf("%s: RA=%s 不是食甚时刻的 %s", want.name, got, wantValue)
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}
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if got, wantValue := dec, html.EscapeString(formatSolarEclipseDec(maximumDec)); got != wantValue {
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t.Errorf("%s: Dec=%s 不是食甚时刻的 %s", want.name, got, wantValue)
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}
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inputRA, inputDec := basic.HMoonTrueRaDec(timeToTTJDE(want.date))
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if math.Abs(maximumRA-inputRA) < 1 {
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t.Fatalf("%s: 该用例区分不出输入日期与食甚时刻", want.name)
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}
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if dec == html.EscapeString(formatSolarEclipseDec(inputDec)) {
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t.Errorf("%s: Dec 仍等于输入日期时刻的值 %s", want.name, formatSolarEclipseDec(inputDec))
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}
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}
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}
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func lunarGeocentricMoonBlock(t *testing.T, doc string) (string, string) {
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t.Helper()
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block := regexp.MustCompile(`食甚时的月亮（地心坐标）(.*?)</g>`).FindStringSubmatch(doc)
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if block == nil {
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t.Fatal("geocentric Moon block not found")
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}
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value := func(label string) string {
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pattern := regexp.MustCompile(regexp.QuoteMeta(label) + `</text><text[^>]*text-anchor="end">([^<]*)</text>`)
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match := pattern.FindStringSubmatch(block[1])
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if match == nil {
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t.Fatalf("row %s not found in the geocentric Moon block", label)
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}
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return match[1]
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}
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return value("赤经 R.A."), value("赤纬 Dec.")
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}
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