56 lines
1.9 KiB
Go
56 lines
1.9 KiB
Go
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package svg
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import (
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"regexp"
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"strings"
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"testing"
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"time"
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"b612.me/astro"
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)
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// 太阳能图的 UT1 输出只改时刻文字：直射点、闭合弧与等时线几何必须逐字节相同。
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// 时刻标记按输出时标的整点取点（UT1 整点是另一个物理时刻），与文字一起从比较里剔除。
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func TestSolarEclipseMapUT1KeepsGeometry(t *testing.T) {
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for _, date := range []time.Time{
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time.Date(2021, time.June, 10, 12, 0, 0, 0, time.UTC), // DUT1 较大，直射点位移可测
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time.Date(1995, time.October, 24, 12, 0, 0, 0, time.UTC), // 双向极限事件
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time.Date(2024, time.April, 8, 12, 0, 0, 0, time.UTC),
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} {
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options := SolarEclipseMapSVGOptions{
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Width: 1200, Height: 800, Location: time.UTC, TimeLabelStep: 30 * time.Minute,
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}
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utc, ok := SolarEclipseMapSVG(date, options)
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if !ok {
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t.Fatalf("%s: UTC render failed", date.Format("2006-01-02"))
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}
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ut1Options := options
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ut1Options.TimeScale = astro.TimeScaleUT1
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ut1, ok := SolarEclipseMapSVG(date, ut1Options)
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if !ok {
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t.Fatalf("%s: UT1 render failed", date.Format("2006-01-02"))
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}
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if !strings.Contains(ut1, "DUT1 = UT1−UTC") {
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t.Errorf("%s: UT1 chart does not declare the DUT1 offset", date.Format("2006-01-02"))
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}
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cst := time.FixedZone("CST", 8*3600)
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badOptions := ut1Options
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badOptions.Location = cst
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if _, ok := SolarEclipseMapSVG(date, badOptions); ok {
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t.Errorf("%s: UT1 with a non-UTC location must fail", date.Format("2006-01-02"))
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}
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if stripSolarTimescaleText(utc) != stripSolarTimescaleText(ut1) {
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t.Errorf("%s: switching to UT1 changed chart geometry", date.Format("2006-01-02"))
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}
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}
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}
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var (
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solarTimescaleText = regexp.MustCompile(`(?s)<text[^>]*>.*?</text>`)
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solarTimescaleMarkers = regexp.MustCompile(`(?s)<g class="solar-time-marker">.*?</g>`)
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)
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func stripSolarTimescaleText(doc string) string {
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return solarTimescaleText.ReplaceAllString(solarTimescaleMarkers.ReplaceAllString(doc, ""), "")
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}
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