feat: 完善日月食与月掩几何链路并扩展历法接口
- 新增日月食中心带、偏食带、阴影足迹、等时线、食分线及升落边界计算，支持极区与混合食拓扑 - 新增日食单时刻阴影求解器、站心状态查询、批量采样和 ΔT 覆盖接口 - 重构恒星与行星月掩路径，补充有限盘面接触、站心修正、掩带宽度、极区投影及升落边界 - 扩展 SVG 与 GeoJSON 输出，支持详细面板、全球/极区/地球投影、边界闭合、时间标记和拓扑签名 - 扩展日月食候选搜索、局地搜索、沙罗序列预计算与范围外推，补充系列锚点和成员一致性校验 - 补齐古历纪年、儒略历独有闰日、多公历候选、历法改革跨日及精确日期运算接口 - 优化 ΔT、章动、恒星时、月球地平线、事件根搜索和本地星历缓存，降低重复计算开销并提升边界稳定
This commit is contained in:
+39
-137
@@ -9,6 +9,7 @@ import (
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"testing"
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"time"
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"b612.me/astro/basic"
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"b612.me/astro/internal/svgmap"
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)
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@@ -59,6 +60,9 @@ func TestLunarEclipseMapSVGUsesExclusiveVisibilityLayers(t *testing.T) {
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if strings.Contains(diagram, `class="entire-eclipse-region"`) && strings.Contains(diagram, `fill-opacity="0.70"`) {
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t.Fatal("entire-eclipse region still uses the opaque stacked-overlay style")
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}
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if !strings.Contains(diagram, `clipPath id="lunar-visible-maximum"`) {
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t.Fatal("entire-eclipse region is not constrained by greatest-eclipse visibility")
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}
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}
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func TestLunarEclipseMapSVGSupportsForcedPolarProjection(t *testing.T) {
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@@ -79,118 +83,45 @@ func TestLunarEclipseMapSVGSupportsForcedPolarProjection(t *testing.T) {
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}
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}
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func TestLunarEclipseVisibilityPolygonsContainOnlyVisibleHemisphere(t *testing.T) {
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tests := []struct {
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name string
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projection svgmap.Projection
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center svgmap.GeoPoint
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visible svgmap.GeoPoint
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hidden svgmap.GeoPoint
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}{
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{
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name: "equirectangular across antimeridian",
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projection: svgmap.ProjectionEquirectangular,
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center: svgmap.GeoPoint{Longitude: 170, Latitude: 12},
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visible: svgmap.GeoPoint{Longitude: 170, Latitude: 12},
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hidden: svgmap.GeoPoint{Longitude: -10, Latitude: -12},
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},
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{
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name: "north polar center inside projection",
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projection: svgmap.ProjectionNorthPolar,
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center: svgmap.GeoPoint{Longitude: 30, Latitude: 20},
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visible: svgmap.GeoPoint{Longitude: 30, Latitude: 80},
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hidden: svgmap.GeoPoint{Longitude: -150, Latitude: 10},
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},
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{
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name: "north polar center outside projection",
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projection: svgmap.ProjectionNorthPolar,
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center: svgmap.GeoPoint{Longitude: 30, Latitude: -20},
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visible: svgmap.GeoPoint{Longitude: 30, Latitude: 10},
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hidden: svgmap.GeoPoint{Longitude: 30, Latitude: 90},
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},
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{
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name: "south polar center inside projection",
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projection: svgmap.ProjectionSouthPolar,
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center: svgmap.GeoPoint{Longitude: -45, Latitude: -20},
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visible: svgmap.GeoPoint{Longitude: -45, Latitude: -80},
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hidden: svgmap.GeoPoint{Longitude: 135, Latitude: -10},
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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frame := svgmap.Frame{Width: 360, Height: 360, Projection: test.projection}
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polygons := lunarEclipseVisibilityPolygons(test.center, test.projection, 360)
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if len(polygons) == 0 {
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t.Fatal("visibility polygon is empty")
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}
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if !projectedPointInLunarVisibility(frame, polygons, test.visible) {
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t.Fatalf("visible point %#v is outside the rendered region", test.visible)
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}
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if projectedPointInLunarVisibility(frame, polygons, test.hidden) {
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t.Fatalf("hidden point %#v is inside the rendered region", test.hidden)
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}
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})
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}
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}
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func TestLunarEclipseVisibilityPathDoesNotUseTriangleFan(t *testing.T) {
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for _, projection := range []svgmap.Projection{
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svgmap.ProjectionEquirectangular,
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svgmap.ProjectionNorthPolar,
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svgmap.ProjectionSouthPolar,
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func TestLunarEclipseVisibilityPathMatchesTopocentricHorizon(t *testing.T) {
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for _, at := range []time.Time{
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time.Date(2026, 3, 3, 9, 0, 0, 0, time.UTC),
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time.Date(2025, 9, 7, 16, 0, 0, 0, time.UTC),
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time.Date(2024, 12, 15, 12, 0, 0, 0, time.UTC),
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} {
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frame := svgmap.Frame{Width: 720, Height: 360, Projection: projection}
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if projection != svgmap.ProjectionEquirectangular {
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frame.Width = 360
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}
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path := lunarEclipseVisibilityPathForCenter(
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svgmap.GeoPoint{Longitude: 170, Latitude: 12}, frame,
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)
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if subpaths := strings.Count(path, "M "); subpaths != 1 {
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t.Fatalf("%s visibility path has %d subpaths, want one continuous outline", projection, subpaths)
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}
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if strings.Contains(path, "NaN") || strings.Contains(path, "Inf") {
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t.Fatalf("%s visibility path contains a non-finite coordinate", projection)
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}
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}
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}
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func TestLunarEclipseVisibilityPolygonsMatchSphericalHorizon(t *testing.T) {
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tests := []struct {
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projection svgmap.Projection
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center svgmap.GeoPoint
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}{
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{svgmap.ProjectionEquirectangular, svgmap.GeoPoint{Longitude: 170, Latitude: 18}},
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{svgmap.ProjectionEquirectangular, svgmap.GeoPoint{Longitude: -170, Latitude: -18}},
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{svgmap.ProjectionEquirectangular, svgmap.GeoPoint{Longitude: 170, Latitude: 0}},
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{svgmap.ProjectionNorthPolar, svgmap.GeoPoint{Longitude: 35, Latitude: 18}},
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{svgmap.ProjectionNorthPolar, svgmap.GeoPoint{Longitude: 35, Latitude: -18}},
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{svgmap.ProjectionSouthPolar, svgmap.GeoPoint{Longitude: -70, Latitude: -18}},
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{svgmap.ProjectionSouthPolar, svgmap.GeoPoint{Longitude: -70, Latitude: 18}},
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}
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for _, test := range tests {
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frame := svgmap.Frame{Width: 720, Height: 360, Projection: test.projection}
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if test.projection != svgmap.ProjectionEquirectangular {
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frame.Width = 360
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}
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polygons := lunarEclipseVisibilityPolygons(test.center, test.projection, 360)
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for latitude := -75.0; latitude <= 75; latitude += 15 {
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if test.projection == svgmap.ProjectionNorthPolar && latitude <= 0 {
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continue
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for _, projection := range []svgmap.Projection{svgmap.ProjectionEquirectangular, svgmap.ProjectionNorthPolar, svgmap.ProjectionSouthPolar} {
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frame := svgmap.Frame{Width: 36000, Height: 18000, Projection: projection}
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path, boundary := lunarEclipseVisibilityPath(at, frame)
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if strings.Contains(path, "NaN") || strings.Contains(path, "Inf") {
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t.Fatal("nonfinite path")
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}
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if test.projection == svgmap.ProjectionSouthPolar && latitude >= 0 {
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continue
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rings := svgClosedPathRings(t, `<path d="`+path+`"/>`)
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if len(rings) == 0 || len(rings) > 3 {
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t.Fatalf("projection=%s subpaths=%d", projection, len(rings))
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}
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for longitude := -165.0; longitude <= 165; longitude += 30 {
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point := svgmap.GeoPoint{Longitude: longitude, Latitude: latitude}
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dot := lunarVisibilityDot(test.center, point)
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if math.Abs(dot) < 0.02 {
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continue
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jd := basic.Date2JDE(at)
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for _, point := range boundary {
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if altitude := basic.HMoonHeight(jd, point.Longitude, point.Latitude, 0); math.Abs(altitude) > 1e-9 {
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t.Fatalf("horizon altitude=%g", altitude)
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}
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got := projectedPointInLunarVisibility(frame, polygons, point)
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if got != (dot > 0) {
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t.Fatalf("%s center=%#v point=%#v inside=%v dot=%.6f",
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test.projection, test.center, point, got, dot)
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}
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for lon := -175.; lon < 180; lon += 20 {
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for lat := -85.; lat < 90; lat += 10 {
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x, y, ok := frame.Project(lon, lat)
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if !ok {
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continue
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}
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altitude := basic.HMoonHeight(jd, lon, lat, 0)
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if math.Abs(altitude) < 0.05 {
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continue
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}
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inside := false
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for _, ring := range rings {
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inside = inside || pointInLunarVisibilityPolygon(x, y, ring)
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}
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if inside != (altitude > 0) {
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t.Fatalf("projection=%s at=%s site=(%v,%v) inside=%v altitude=%v", projection, at, lon, lat, inside, altitude)
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}
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}
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}
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}
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@@ -218,26 +149,6 @@ func validateEclipseMapXML(value string) error {
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}
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}
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func projectedPointInLunarVisibility(frame svgmap.Frame, polygons [][]svgmap.GeoPoint, point svgmap.GeoPoint) bool {
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x, y, ok := frame.Project(point.Longitude, point.Latitude)
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if !ok {
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return false
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}
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for _, polygon := range polygons {
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projected := make([][2]float64, 0, len(polygon))
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for _, vertex := range polygon {
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px, py, projectedOK := frame.Project(vertex.Longitude, vertex.Latitude)
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if projectedOK {
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projected = append(projected, [2]float64{px, py})
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}
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}
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if pointInLunarVisibilityPolygon(x, y, projected) {
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return true
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}
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}
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return false
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}
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func pointInLunarVisibilityPolygon(x, y float64, polygon [][2]float64) bool {
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inside := false
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for current, previous := 0, len(polygon)-1; current < len(polygon); previous, current = current, current+1 {
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@@ -249,12 +160,3 @@ func pointInLunarVisibilityPolygon(x, y float64, polygon [][2]float64) bool {
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}
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return inside
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}
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func lunarVisibilityDot(center, point svgmap.GeoPoint) float64 {
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centerLongitude := center.Longitude * math.Pi / 180
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centerLatitude := center.Latitude * math.Pi / 180
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longitude := point.Longitude * math.Pi / 180
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latitude := point.Latitude * math.Pi / 180
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return math.Sin(centerLatitude)*math.Sin(latitude) +
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math.Cos(centerLatitude)*math.Cos(latitude)*math.Cos(longitude-centerLongitude)
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}
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