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:
+260
-67
@@ -4,12 +4,14 @@ import (
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"fmt"
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"html"
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"math"
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"sort"
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"strings"
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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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"b612.me/astro/internal/svgasset"
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"b612.me/astro/internal/svgchart"
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)
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const (
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@@ -77,6 +79,8 @@ type lunarEclipseSVGLayout struct {
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scale float64
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diagramLeft float64
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diagramRight float64
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diagramTop float64
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diagramEnd float64
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panelX float64
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panelY float64
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}
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@@ -96,12 +100,37 @@ type lunarEclipseSVGMaximumCoordinates struct {
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ConstellationName string
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}
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// LunarEclipseSVG 生成月食穿影图 SVG，默认使用 Danjon 影半径模型。
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// LunarEclipseSVG generates an SVG lunar eclipse shadow-path chart, using the Danjon shadow model by default.
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// LunarEclipseSVG 生成月食穿影图 SVG，默认模型与 LunarEclipseOnDate 一致：Danjon 为主，极浅半影回退 Chauvenet。
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// LunarEclipseSVG generates an SVG lunar eclipse shadow-path chart with the default model of
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// LunarEclipseOnDate: Danjon, falling back to Chauvenet for ultra-shallow penumbral cases.
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func LunarEclipseSVG(date time.Time, options LunarEclipseSVGOptions) (string, bool) {
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model, ok := lunarEclipseDefaultShadowModel(date)
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if !ok {
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return "", false
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}
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if model == eclipsecore.LunarEclipseShadowModelChauvenet {
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return LunarEclipseSVGChauvenet(date, options)
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}
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return LunarEclipseSVGDanjon(date, options)
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}
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// lunarEclipseDefaultShadowModel 返回默认模型下该日期的月食影半径模型；当天没有月食时返回 false。
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func lunarEclipseDefaultShadowModel(date time.Time) (eclipsecore.LunarEclipseShadowModel, bool) {
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info, ok := eclipsecore.LunarEclipseOnDate(date)
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if !ok {
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return eclipsecore.LunarEclipseShadowModelDanjon, false
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}
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return info.ShadowModel, true
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}
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// lunarEclipseShadowModelName 给出影半径模型的展示名。
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func lunarEclipseShadowModelName(model eclipsecore.LunarEclipseShadowModel) string {
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if model == eclipsecore.LunarEclipseShadowModelChauvenet {
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return "Chauvenet"
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}
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return "Danjon"
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}
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// LunarEclipseSVGDanjon 生成月食穿影图 SVG，使用 Danjon 影半径模型。
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// LunarEclipseSVGDanjon generates an SVG lunar eclipse shadow-path chart with the Danjon shadow model.
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func LunarEclipseSVGDanjon(date time.Time, options LunarEclipseSVGOptions) (string, bool) {
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@@ -154,6 +183,140 @@ func normalizeLunarEclipseSVGOptions(options LunarEclipseSVGOptions) LunarEclips
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return options
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}
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// writeLunarEclipseDiagram 在给定圆心与比例下画地影、月心轨迹与各阶段月面。
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// 独立月食图和 详细版式组合图共用这一段，只有圆心的位置不同。
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func writeLunarEclipseDiagram(
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b *strings.Builder,
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layout lunarEclipseSVGLayout,
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diagram basic.LunarEclipseDiagramResult,
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language string,
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labels *svgchart.LabelTable,
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) {
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cx, cy, scale := layout.cx, layout.cy, layout.scale
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points := lunarEclipseSVGPoints(diagram.Points)
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mapX := func(x float64) float64 { return cx - x*scale }
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mapY := func(y float64) float64 { return cy - y*scale }
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area := svgchart.LabelBox{
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X: layout.diagramLeft, Y: layout.diagramTop,
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Width: layout.diagramRight - layout.diagramLeft, Height: layout.diagramEnd - layout.diagramTop,
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}
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fmt.Fprintf(b, `<circle cx="%.3f" cy="%.3f" r="%.3f" fill="#e9e9e9" stroke="#d6d6d6" stroke-width="1.2"/>`,
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cx, cy, diagram.PenumbraRadius*scale)
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fmt.Fprintf(b, `<circle cx="%.3f" cy="%.3f" r="%.3f" fill="#b21f16" stroke="#83170f" stroke-width="1.3"/>`,
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cx, cy, diagram.UmbraRadius*scale)
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writeLunarEclipseShadowLabels(b, layout, diagram, language, labels, area)
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writeLunarEclipseAxes(b, cx, cy, diagram.PenumbraRadius*scale, language, labels, area)
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writeLunarEclipseEclipticLine(b, layout, diagram, mapX, mapY, language, labels, area)
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if len(points) > 0 {
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b.WriteString(`<path d="`)
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for i, point := range points {
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if i == 0 {
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fmt.Fprintf(b, `M %.3f %.3f`, mapX(point.X), mapY(point.Y))
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continue
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}
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fmt.Fprintf(b, ` L %.3f %.3f`, mapX(point.X), mapY(point.Y))
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}
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b.WriteString(`" fill="none" stroke="#333333" stroke-width="1.1" stroke-dasharray="5 4" stroke-linecap="round" stroke-linejoin="round"/>`)
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}
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eventPoints := lunarEclipseSVGEventPoints(points)
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for _, point := range eventPoints {
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if point.Label == "Greatest" {
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continue
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}
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writeLunarEclipseMoon(b, point, diagram, mapX(point.X), mapY(point.Y), scale, false)
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}
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for _, point := range eventPoints {
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if point.Label == "Greatest" {
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writeLunarEclipseMoon(b, point, diagram, mapX(point.X), mapY(point.Y), scale, true)
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break
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}
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}
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writeLunarEclipseEventLabels(b, eventPoints, mapX, mapY, cx, diagram.MoonRadius*scale, language, labels, area)
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}
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// lunarEclipseEventLabelRank 是事件标注的占位优先级：数字小的先占位，放不下的后放的让位。
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func lunarEclipseEventLabelRank(label string) int {
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switch label {
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case "Greatest":
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return 0
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case "U2", "U3":
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return 1
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case "U1", "U4":
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return 2
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case "P1", "P4":
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return 3
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}
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return 4
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}
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// writeLunarEclipseEventLabels 先按重要性占位再按原顺序绘制：食甚最优先，其次本影接触，最后半影接触。
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func writeLunarEclipseEventLabels(
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b *strings.Builder,
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eventPoints []lunarEclipseSVGPoint,
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mapX, mapY func(float64) float64,
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cx, moonRadius float64,
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language string,
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labels *svgchart.LabelTable,
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area svgchart.LabelBox,
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) {
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type eventLabel struct {
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rank int
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text string
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candidates []svgchart.LabelPlacement
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placed svgchart.LabelPlacement
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ok bool
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}
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entries := make([]eventLabel, 0, len(eventPoints))
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for _, point := range eventPoints {
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if point.Label == "" {
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continue
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}
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x := mapX(point.X)
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y := mapY(point.Y)
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dx := moonRadius*0.72 + 6
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anchor := "start"
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if x < cx {
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dx = -dx
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anchor = "end"
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}
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dy := -moonRadius*0.35 - 4
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if point.Label == "Greatest" {
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dy = moonRadius + 15
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anchor = "middle"
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dx = 0
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}
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candidates := []svgchart.LabelPlacement{{X: x + dx, Y: y + dy, Anchor: anchor}}
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// 浅半影食里 P1 与 P4 挨得很近，近环放不下时还要一圈更远的候选。
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candidates = append(candidates, svgchart.LabelCandidates(x+dx, y+dy, anchor, math.Max(14, moonRadius*0.8))...)
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candidates = append(candidates, svgchart.LabelCandidates(x+dx, y+dy, anchor, math.Max(30, moonRadius*1.6))...)
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candidates = append(candidates, svgchart.LabelCandidates(x+dx, y+dy, anchor, math.Max(48, moonRadius*2.4))...)
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entries = append(entries, eventLabel{
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rank: lunarEclipseEventLabelRank(point.Label),
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text: lunarEclipseSVGEventName(point.Label, language),
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candidates: candidates,
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})
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}
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order := make([]int, len(entries))
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for index := range entries {
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order[index] = index
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}
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sort.SliceStable(order, func(i, j int) bool { return entries[order[i]].rank < entries[order[j]].rank })
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for _, index := range order {
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entry := &entries[index]
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entry.placed, entry.ok = labels.Place(entry.text, 12,
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labelCandidatesInsideBox(entry.candidates, entry.text, 12, area))
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}
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for _, entry := range entries {
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if !entry.ok {
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continue
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}
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fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#2554c7" font-family="Georgia, 'Times New Roman', serif" font-size="12" text-anchor="%s">%s</text>`,
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entry.placed.X, entry.placed.Y, entry.placed.Anchor, html.EscapeString(entry.text))
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}
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}
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func renderLunarEclipseSVG(
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info LunarEclipseInfo,
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diagram basic.LunarEclipseDiagramResult,
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@@ -161,9 +324,6 @@ func renderLunarEclipseSVG(
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) string {
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headerTexts := lunarEclipseSVGHeaderTexts(info, options)
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layout := lunarEclipseSVGLayoutFor(diagram, options, lunarEclipseSVGHeaderBottom(headerTexts))
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points := lunarEclipseSVGPoints(diagram.Points)
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mapX := func(x float64) float64 { return layout.cx - x*layout.scale }
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mapY := func(y float64) float64 { return layout.cy - y*layout.scale }
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title := lunarEclipseSVGTitleText(info, options)
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var b strings.Builder
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@@ -174,51 +334,21 @@ func renderLunarEclipseSVG(
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b.WriteString(`<rect width="100%" height="100%" fill="#efefed"/>`)
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fmt.Fprintf(&b, `<rect x="22" y="18" width="%.3f" height="%.3f" fill="#ffffff" stroke="#c9c9c6" stroke-width="1.2"/>`,
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layout.width-44, layout.height-36)
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titleText := title
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if options.Title != "" {
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titleText = svgchart.EllipsizeText(title, layout.width-52, 26)
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}
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fmt.Fprintf(&b, `<text x="%.3f" y="44" fill="#111111" font-family="Georgia, 'Times New Roman', serif" font-size="26" font-weight="700" text-anchor="middle">%s</text>`,
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layout.width/2, html.EscapeString(title))
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layout.width/2, html.EscapeString(titleText))
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fmt.Fprintf(&b, `<line x1="%.3f" y1="57" x2="%.3f" y2="57" stroke="#555" stroke-width="1"/>`, layout.width/2-78, layout.width/2+78)
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writeLunarEclipseSummary(&b, headerTexts, options)
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fmt.Fprintf(&b, `<circle cx="%.3f" cy="%.3f" r="%.3f" fill="#e9e9e9" stroke="#d6d6d6" stroke-width="1.2"/>`,
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layout.cx, layout.cy, diagram.PenumbraRadius*layout.scale)
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fmt.Fprintf(&b, `<circle cx="%.3f" cy="%.3f" r="%.3f" fill="#b21f16" stroke="#83170f" stroke-width="1.3"/>`,
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layout.cx, layout.cy, diagram.UmbraRadius*layout.scale)
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writeLunarEclipseShadowLabels(&b, layout, diagram, options.Language)
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writeLunarEclipseAxes(&b, layout.cx, layout.cy, diagram.PenumbraRadius*layout.scale, options.Language)
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writeLunarEclipseEclipticLine(&b, layout, diagram, mapX, mapY, options.Language)
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if len(points) > 0 {
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b.WriteString(`<path d="`)
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for i, point := range points {
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if i == 0 {
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fmt.Fprintf(&b, `M %.3f %.3f`, mapX(point.X), mapY(point.Y))
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continue
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}
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fmt.Fprintf(&b, ` L %.3f %.3f`, mapX(point.X), mapY(point.Y))
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}
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b.WriteString(`" fill="none" stroke="#333333" stroke-width="1.1" stroke-dasharray="5 4" stroke-linecap="round" stroke-linejoin="round"/>`)
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}
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eventPoints := lunarEclipseSVGEventPoints(points)
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for _, point := range eventPoints {
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if point.Label == "Greatest" {
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continue
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}
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writeLunarEclipseMoon(&b, point, diagram, mapX(point.X), mapY(point.Y), layout.scale, false)
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}
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for _, point := range eventPoints {
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if point.Label == "Greatest" {
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writeLunarEclipseMoon(&b, point, diagram, mapX(point.X), mapY(point.Y), layout.scale, true)
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break
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}
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}
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for _, point := range eventPoints {
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if point.Label == "" {
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continue
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}
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x := mapX(point.X)
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y := mapY(point.Y)
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writeLunarEclipseEventLabel(&b, point.Label, x, y, layout.cx, diagram.MoonRadius*layout.scale, options.Language)
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}
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// 穿影示意图的标注要避开已经写好的表头与右侧接触时刻面板。
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labels := &svgchart.LabelTable{}
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labels.Reserve(0, 0, layout.width, layout.diagramTop)
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labels.Reserve(layout.diagramRight, layout.diagramTop,
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layout.width-layout.diagramRight, layout.diagramEnd-layout.diagramTop)
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labels.Reserve(0, layout.diagramEnd, layout.width, layout.height-layout.diagramEnd)
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writeLunarEclipseDiagram(&b, layout, diagram, options.Language, labels)
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writeLunarEclipseContacts(&b, info, options, layout.panelX, layout.panelY)
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writeLunarEclipseFooter(&b, info, options, layout)
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@@ -265,6 +395,8 @@ func lunarEclipseSVGLayoutFor(
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scale: scale,
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diagramLeft: diagramLeft,
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diagramRight: diagramRight,
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diagramTop: topReserved,
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diagramEnd: height - bottomReserved,
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panelX: panelX,
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panelY: math.Max(148, cy-88),
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}
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@@ -504,9 +636,17 @@ func lunarEclipseSVGMetaText(info LunarEclipseInfo, language string) string {
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return ""
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}
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if language == lunarEclipseSVGLanguageEnglish {
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return fmt.Sprintf("Lunar Saros %d %d/%d", info.Saros.Series, info.Saros.Member, info.Saros.Count)
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label := fmt.Sprintf("Lunar Saros %d %d/%d", info.Saros.Series, info.Saros.Member, info.Saros.Count)
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if !info.Saros.Verified {
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label += " (provisional)"
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}
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return label
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}
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return fmt.Sprintf("沙罗 %d 第 %d/%d 个成员", info.Saros.Series, info.Saros.Member, info.Saros.Count)
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label := fmt.Sprintf("沙罗 %d 第 %d/%d 个成员", info.Saros.Series, info.Saros.Member, info.Saros.Count)
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if !info.Saros.Verified {
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label += "（推算）"
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}
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return label
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}
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func lunarEclipseSVGFormatDuration(duration time.Duration) string {
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@@ -545,19 +685,35 @@ func lunarEclipseSVGTypeName(eclipseType LunarEclipseType, language string) stri
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}
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}
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func writeLunarEclipseAxes(b *strings.Builder, cx, cy, radius float64, language string) {
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func writeLunarEclipseAxes(
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b *strings.Builder,
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cx, cy, radius float64,
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language string,
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labels *svgchart.LabelTable,
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area svgchart.LabelBox,
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) {
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north, east, west, south := "北", "东", "西", "南"
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if language == lunarEclipseSVGLanguageEnglish {
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north, east, west, south = "N", "E", "W", "S"
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}
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fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#111" font-family="Georgia, 'Times New Roman', serif" font-size="14" font-weight="700" text-anchor="middle">%s</text>`,
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cx, cy-radius-18, html.EscapeString(north))
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fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#111" font-family="Georgia, 'Times New Roman', serif" font-size="14" font-weight="700" text-anchor="middle">%s</text>`,
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cx-radius-22, cy+4, html.EscapeString(east))
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fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#111" font-family="Georgia, 'Times New Roman', serif" font-size="14" font-weight="700" text-anchor="middle">%s</text>`,
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cx+radius+22, cy+4, html.EscapeString(west))
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fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#111" font-family="Georgia, 'Times New Roman', serif" font-size="14" font-weight="700" text-anchor="middle">%s</text>`,
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cx, cy+radius+28, html.EscapeString(south))
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entries := [4]struct {
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text string
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x, y float64
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}{
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{text: north, x: cx, y: cy - radius - 18},
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{text: east, x: cx - radius - 22, y: cy + 4},
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{text: west, x: cx + radius + 22, y: cy + 4},
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{text: south, x: cx, y: cy + radius + 28},
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}
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for _, entry := range entries {
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candidates := svgchart.LabelCandidates(entry.x, entry.y, "middle", 15)
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placed, ok := labels.Place(entry.text, 14, labelCandidatesInsideBox(candidates, entry.text, 14, area))
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if !ok {
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continue
|
||||
}
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#111" font-family="Georgia, 'Times New Roman', serif" font-size="14" font-weight="700" text-anchor="%s">%s</text>`,
|
||||
placed.X, placed.Y, placed.Anchor, html.EscapeString(entry.text))
|
||||
}
|
||||
}
|
||||
|
||||
func lunarEclipseSVGPoints(points []basic.LunarEclipseDiagramPoint) []lunarEclipseSVGPoint {
|
||||
@@ -580,6 +736,8 @@ func writeLunarEclipseEclipticLine(
|
||||
diagram basic.LunarEclipseDiagramResult,
|
||||
mapX, mapY func(float64) float64,
|
||||
language string,
|
||||
labels *svgchart.LabelTable,
|
||||
area svgchart.LabelBox,
|
||||
) {
|
||||
unitX, unitY, ok := lunarEclipseSVGEclipticDirection(diagram.Eclipse.Maximum)
|
||||
if !ok {
|
||||
@@ -610,8 +768,15 @@ func writeLunarEclipseEclipticLine(
|
||||
labelX += 16
|
||||
anchor = "start"
|
||||
}
|
||||
text := lunarEclipseSVGLabelEcliptic(language)
|
||||
candidates := append([]svgchart.LabelPlacement{{X: labelX, Y: labelY + 4, Anchor: anchor}},
|
||||
svgchart.LabelCandidates(labelX, labelY+4, anchor, 14)...)
|
||||
placed, ok := labels.Place(text, 12, labelCandidatesInsideBox(candidates, text, 12, area))
|
||||
if !ok {
|
||||
return
|
||||
}
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#444" font-family="Georgia, 'Times New Roman', serif" font-size="12" text-anchor="%s">%s</text>`,
|
||||
labelX, labelY+4, anchor, html.EscapeString(lunarEclipseSVGLabelEcliptic(language)))
|
||||
placed.X, placed.Y, placed.Anchor, html.EscapeString(text))
|
||||
}
|
||||
|
||||
func lunarEclipseSVGEclipticDirection(ttJDE float64) (float64, float64, bool) {
|
||||
@@ -664,15 +829,31 @@ func writeLunarEclipseShadowLabels(
|
||||
layout lunarEclipseSVGLayout,
|
||||
diagram basic.LunarEclipseDiagramResult,
|
||||
language string,
|
||||
labels *svgchart.LabelTable,
|
||||
area svgchart.LabelBox,
|
||||
) {
|
||||
penumbraLabel, umbraLabel := "地球半影", "地球本影"
|
||||
if language == lunarEclipseSVGLanguageEnglish {
|
||||
penumbraLabel, umbraLabel = "Earth's Penumbra", "Earth's Umbra"
|
||||
}
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#333" font-family="Georgia, 'Times New Roman', serif" font-size="13" font-weight="700" text-anchor="middle">%s</text>`,
|
||||
layout.cx, layout.cy-diagram.PenumbraRadius*layout.scale+28, html.EscapeString(penumbraLabel))
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#111" font-family="Georgia, 'Times New Roman', serif" font-size="13" font-weight="700" text-anchor="middle">%s</text>`,
|
||||
layout.cx, layout.cy-diagram.UmbraRadius*layout.scale+22, html.EscapeString(umbraLabel))
|
||||
entries := [2]struct {
|
||||
text string
|
||||
x, y float64
|
||||
fill string
|
||||
weight string
|
||||
}{
|
||||
{text: penumbraLabel, x: layout.cx, y: layout.cy - diagram.PenumbraRadius*layout.scale + 28, fill: "#333", weight: "700"},
|
||||
{text: umbraLabel, x: layout.cx, y: layout.cy - diagram.UmbraRadius*layout.scale + 22, fill: "#111", weight: "700"},
|
||||
}
|
||||
for _, entry := range entries {
|
||||
candidates := svgchart.LabelCandidates(entry.x, entry.y, "middle", 14)
|
||||
placed, ok := labels.Place(entry.text, 13, labelCandidatesInsideBox(candidates, entry.text, 13, area))
|
||||
if !ok {
|
||||
continue
|
||||
}
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="%s" font-family="Georgia, 'Times New Roman', serif" font-size="13" font-weight="%s" text-anchor="%s">%s</text>`,
|
||||
placed.X, placed.Y, entry.fill, entry.weight, placed.Anchor, html.EscapeString(entry.text))
|
||||
}
|
||||
}
|
||||
|
||||
func lunarEclipseSVGEventPoints(points []lunarEclipseSVGPoint) []lunarEclipseSVGPoint {
|
||||
@@ -823,11 +1004,23 @@ func writeLunarEclipseFooter(
|
||||
layout lunarEclipseSVGLayout,
|
||||
) {
|
||||
_ = info
|
||||
direction := lunarEclipseSVGDirectionTextValue(options)
|
||||
if options.DirectionText != "" {
|
||||
direction = svgchart.EllipsizeText(direction, layout.width-80, 12)
|
||||
}
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#333" font-family="Georgia, 'Times New Roman', serif" font-size="12">%s</text>`,
|
||||
40.0, layout.height-54, html.EscapeString(lunarEclipseSVGDirectionTextValue(options)))
|
||||
note := lunarEclipseSVGFooterNoteText(options)
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#555" font-family="Georgia, 'Times New Roman', serif" font-size="12">%s</text>`,
|
||||
40.0, layout.height-34, html.EscapeString(note))
|
||||
40.0, layout.height-54, html.EscapeString(direction))
|
||||
// 默认说明是单行；调用方文本折行后按画布底边截断，首行位置不变。
|
||||
lines := []string{lunarEclipseSVGFooterNoteText(options)}
|
||||
if options.FooterNote != "" {
|
||||
maxWidth := layout.width - 80
|
||||
lines = svgchart.TruncateTextLines(svgchart.WrapText(options.FooterNote, maxWidth, 12), maxWidth, 12,
|
||||
svgchart.BaselineLineLimit(12, 15, layout.height-34, layout.height-4))
|
||||
}
|
||||
for index, line := range lines {
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#555" font-family="Georgia, 'Times New Roman', serif" font-size="12">%s</text>`,
|
||||
40.0, layout.height-34+float64(index)*15, html.EscapeString(line))
|
||||
}
|
||||
}
|
||||
|
||||
func lunarEclipseSVGContacts(info LunarEclipseInfo, language string) []lunarEclipseSVGContact {
|
||||
|
||||
Reference in New Issue
Block a user