89 lines
2.9 KiB
Go
89 lines
2.9 KiB
Go
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package svg
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import (
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"testing"
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"time"
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"b612.me/astro/moon"
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)
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// 总览区接触标签契约：掠掩时四次接触只差几十角秒，标签必须自动避让排开，既不互相压叠、也不压到方位字、
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// 月球圆盘与右侧接触时刻栏；被推远的标签要用引线连回接触点。2026-09-14 保山月掩金星就是这种掠掩样本。
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const localOccultationOverviewLabelFill = "#792d28"
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func localPlanetOccultationOverviewLabels(t *testing.T, diagram string) []occultationSVGText {
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t.Helper()
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labels := []occultationSVGText{}
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for _, text := range occultationSVGTexts(t, diagram) {
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if text.fill == localOccultationOverviewLabelFill {
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labels = append(labels, text)
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}
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}
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return labels
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}
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func localOccultationOverviewLabelOverlaps(labels []occultationSVGText) [][2]string {
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overlaps := [][2]string{}
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for first := 0; first < len(labels); first++ {
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for second := first + 1; second < len(labels); second++ {
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a := occultationSVGTextBox(labels[first])
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b := occultationSVGTextBox(labels[second])
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if a[0] < b[2] && b[0] < a[2] && a[1] < b[3] && b[1] < a[3] {
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overlaps = append(overlaps, [2]string{labels[first].value, labels[second].value})
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}
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}
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}
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return overlaps
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}
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func grazingVenusOccultation(t *testing.T) moon.PlanetOccultationInfo {
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t.Helper()
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location := time.FixedZone("CST", 8*3600)
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events, err := moon.FindPlanetOccultations(
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time.Date(2026, time.September, 14, 0, 0, 0, 0, location),
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time.Date(2026, time.September, 15, 0, 0, 0, 0, location),
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moon.OccultationVenus, 99.1611, 25.1120, 1650, moon.OccultationSearchOptions{},
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)
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if err != nil {
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t.Fatalf("FindPlanetOccultations() error = %v", err)
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}
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if len(events) != 1 {
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t.Fatalf("FindPlanetOccultations() returned %d events, want 1", len(events))
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}
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return events[0]
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}
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func TestLocalPlanetOccultationOverviewLabelsAvoidEachOther(t *testing.T) {
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location := time.FixedZone("CST", 8*3600)
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for _, tc := range []struct {
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name string
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info moon.PlanetOccultationInfo
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width int
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heigh int
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}{
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{"保山掠掩金星", grazingVenusOccultation(t), 935, 683},
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{"土星全掩", localSaturnOccultation(t), 920, 720},
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} {
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diagram, err := LocalPlanetOccultationSVG(tc.info, LocalPlanetOccultationSVGOptions{
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Width: tc.width, Height: tc.heigh, Location: location,
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})
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if err != nil {
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t.Fatalf("%s: %v", tc.name, err)
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}
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labels := localPlanetOccultationOverviewLabels(t, diagram)
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if len(labels) < 2 {
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t.Fatalf("%s：总览区只有 %d 个接触标签", tc.name, len(labels))
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}
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if overlaps := localOccultationOverviewLabelOverlaps(labels); len(overlaps) > 0 {
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t.Fatalf("%s：接触标签互相压叠 %v", tc.name, overlaps)
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}
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for _, text := range labels {
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box := occultationSVGTextBox(text)
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if box[0] < 0 || box[2] > float64(tc.width) || box[1] < 0 || box[3] > float64(tc.heigh) {
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t.Fatalf("%s：标签「%s」越出画布 %v", tc.name, text.value, box)
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}
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}
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}
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}
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