b612
2bf8478639
- 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
1118 lines
37 KiB
Go
1118 lines
37 KiB
Go
package svg
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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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lunarEclipseSVGDefaultWidth = 960
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lunarEclipseSVGDefaultHeight = 620
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lunarEclipseSVGDefaultZone = 8 * 60 * 60
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lunarEclipseSVGLanguageChinese = "zh"
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lunarEclipseSVGLanguageEnglish = "en"
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)
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// LunarEclipseSVGOptions 控制月食穿影 SVG 输出。
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// LunarEclipseSVGOptions controls lunar eclipse shadow-path SVG output.
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type LunarEclipseSVGOptions struct {
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// Width 和 Height 是 SVG 画布尺寸；<=0 时使用默认尺寸。
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// Width/Height are SVG canvas size; values <= 0 use defaults.
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Width int
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Height int
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// Step 是月心路径采样步长；<=0 时使用 5 分钟。
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// Step is the Moon-center path sampling step; values <= 0 use five minutes.
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Step time.Duration
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// Title 是图题；为空时自动生成。
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// Title is the chart title; empty values use an automatic title.
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Title string
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// SummaryText 是标题下第一行摘要；为空时自动生成。
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// SummaryText is the first summary line below the title; empty values use an automatic summary.
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SummaryText string
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// MaximumText 是标题下第二行食甚说明；为空时自动生成。
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// MaximumText is the second line below the title for maximum-eclipse details; empty values use automatic text.
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MaximumText string
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// CoordinatesText 是标题下第三行坐标说明；为空时自动生成。
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// CoordinatesText is the third line below the title for coordinates; empty values use automatic text.
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CoordinatesText string
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// DurationText 是标题下第四行历时说明；为空时自动生成。
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// DurationText is the fourth line below the title for durations; empty values use automatic text.
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DurationText string
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// MetaText 是标题下第五行补充说明；为空时自动生成沙罗信息。
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// MetaText is the fifth line below the title; empty values use automatic Saros text.
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MetaText string
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// ContactsTitle 是接触时刻区标题；为空时自动生成。
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// ContactsTitle is the contacts-panel title; empty values use an automatic title.
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ContactsTitle string
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// DirectionText 是底部方向说明；为空时自动生成。
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// DirectionText is the footer direction note; empty values use an automatic note.
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DirectionText string
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// FooterNote 是底部补充说明；为空时自动生成。
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// FooterNote is the footer explanatory note; empty values use an automatic note.
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FooterNote string
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// Language 是标签语言；"en" 使用英文，其他值或空值使用中文。
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// Language controls label language; "en" uses English, other values or empty values use Chinese.
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Language string
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// Location 是图中显示时刻的时区；nil 时使用 UTC+8。
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// Location is the display timezone for chart times; nil uses UTC+8.
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Location *time.Location
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}
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type lunarEclipseSVGCalculator func(float64, basic.LunarEclipseDiagramOptions) basic.LunarEclipseDiagramResult
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type lunarEclipseSVGFinder func(time.Time) LunarEclipseInfo
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type lunarEclipseSVGLayout struct {
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width float64
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height float64
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cx float64
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cy float64
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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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type lunarEclipseSVGPoint struct {
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basic.LunarEclipseDiagramPoint
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X float64
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Y float64
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}
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type lunarEclipseSVGMaximumCoordinates struct {
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RA float64
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Dec float64
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EclipticLongitude float64
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EclipticLatitude float64
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ConstellationCode string
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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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return lunarEclipseSVG(date, options, basic.LunarEclipseDiagramDanjon, eclipsecore.ClosestLunarEclipseDanjon)
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}
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// LunarEclipseSVGChauvenet 生成月食穿影图 SVG，使用 Chauvenet 影半径模型。
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// LunarEclipseSVGChauvenet generates an SVG lunar eclipse shadow-path chart with the Chauvenet shadow model.
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func LunarEclipseSVGChauvenet(date time.Time, options LunarEclipseSVGOptions) (string, bool) {
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return lunarEclipseSVG(date, options, basic.LunarEclipseDiagramChauvenet, eclipsecore.ClosestLunarEclipseChauvenet)
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}
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func lunarEclipseSVG(
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date time.Time,
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options LunarEclipseSVGOptions,
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calculator lunarEclipseSVGCalculator,
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finder lunarEclipseSVGFinder,
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) (string, bool) {
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options = normalizeLunarEclipseSVGOptions(options)
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diagram := calculator(timeToTTJDE(date), basic.LunarEclipseDiagramOptions{
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StepDays: durationToDays(options.Step),
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})
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if diagram.Eclipse.Type == basic.LunarEclipseNone || len(diagram.Points) == 0 {
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return "", false
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}
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info := lunarEclipseInfoFromBasic(diagram.Eclipse, options.Location)
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if finder != nil {
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coreInfo := finder(info.Maximum)
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info.HasSaros = coreInfo.HasSaros
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info.Saros = coreInfo.Saros
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}
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return renderLunarEclipseSVG(info, diagram, options), true
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}
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func normalizeLunarEclipseSVGOptions(options LunarEclipseSVGOptions) LunarEclipseSVGOptions {
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if options.Width <= 0 {
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options.Width = lunarEclipseSVGDefaultWidth
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}
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if options.Height <= 0 {
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options.Height = lunarEclipseSVGDefaultHeight
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}
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if options.Location == nil {
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options.Location = time.FixedZone("UTC+8", lunarEclipseSVGDefaultZone)
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}
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if strings.EqualFold(options.Language, lunarEclipseSVGLanguageEnglish) {
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options.Language = lunarEclipseSVGLanguageEnglish
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} else {
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options.Language = lunarEclipseSVGLanguageChinese
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}
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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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options LunarEclipseSVGOptions,
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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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title := lunarEclipseSVGTitleText(info, options)
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var b strings.Builder
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fmt.Fprintf(&b, `<svg xmlns="http://www.w3.org/2000/svg" width="%d" height="%d" viewBox="0 0 %d %d">`, options.Width, options.Height, options.Width, options.Height)
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b.WriteString(`<defs>`)
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b.WriteString(svgasset.MoonFaceSymbol())
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b.WriteString(`</defs>`)
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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)
|
||
}
|
||
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>`,
|
||
layout.width/2, html.EscapeString(titleText))
|
||
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)
|
||
// 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。
|
||
labels := &svgchart.LabelTable{}
|
||
labels.Reserve(0, 0, layout.width, layout.diagramTop)
|
||
labels.Reserve(layout.diagramRight, layout.diagramTop,
|
||
layout.width-layout.diagramRight, layout.diagramEnd-layout.diagramTop)
|
||
labels.Reserve(0, layout.diagramEnd, layout.width, layout.height-layout.diagramEnd)
|
||
writeLunarEclipseDiagram(&b, layout, diagram, options.Language, labels)
|
||
|
||
writeLunarEclipseContacts(&b, info, options, layout.panelX, layout.panelY)
|
||
writeLunarEclipseFooter(&b, info, options, layout)
|
||
|
||
b.WriteString(`</svg>`)
|
||
return b.String()
|
||
}
|
||
|
||
func lunarEclipseSVGLayoutFor(
|
||
diagram basic.LunarEclipseDiagramResult,
|
||
options LunarEclipseSVGOptions,
|
||
headerBottom float64,
|
||
) lunarEclipseSVGLayout {
|
||
width := float64(options.Width)
|
||
height := float64(options.Height)
|
||
margin := math.Max(32, math.Min(48, width*0.05))
|
||
panelWidth := math.Max(210, math.Min(260, width*0.24))
|
||
diagramLeft := margin
|
||
diagramRight := width - panelWidth - 34
|
||
if diagramRight-diagramLeft < width*0.48 {
|
||
diagramRight = width - margin
|
||
}
|
||
topReserved := math.Max(166, headerBottom+24)
|
||
bottomReserved := 82.0
|
||
extent := diagram.PenumbraRadius + diagram.MoonRadius + 0.72
|
||
scale := math.Min((diagramRight-diagramLeft)/(2*extent), (height-topReserved-bottomReserved)/(2*extent))
|
||
if scale <= 0 || math.IsNaN(scale) || math.IsInf(scale, 0) {
|
||
scale = 1
|
||
}
|
||
cx := (diagramLeft + diagramRight) / 2
|
||
cy := topReserved + (height-topReserved-bottomReserved)/2 + 12
|
||
panelX := diagramRight + 22
|
||
if panelX+panelWidth > width-margin/2 {
|
||
panelX = width - panelWidth - margin/2
|
||
}
|
||
if panelX < diagramRight {
|
||
panelX = diagramRight
|
||
}
|
||
return lunarEclipseSVGLayout{
|
||
width: width,
|
||
height: height,
|
||
cx: cx,
|
||
cy: cy,
|
||
scale: scale,
|
||
diagramLeft: diagramLeft,
|
||
diagramRight: diagramRight,
|
||
diagramTop: topReserved,
|
||
diagramEnd: height - bottomReserved,
|
||
panelX: panelX,
|
||
panelY: math.Max(148, cy-88),
|
||
}
|
||
}
|
||
|
||
func lunarEclipseSVGTitle(info LunarEclipseInfo, language string) string {
|
||
return fmt.Sprintf("%s %s", info.Maximum.Format("2006-01-02"), lunarEclipseSVGTypeName(info.Type, language))
|
||
}
|
||
|
||
func lunarEclipseSVGTitleText(info LunarEclipseInfo, options LunarEclipseSVGOptions) string {
|
||
if options.Title != "" {
|
||
return options.Title
|
||
}
|
||
return lunarEclipseSVGTitle(info, options.Language)
|
||
}
|
||
|
||
func lunarEclipseSVGHeaderTexts(info LunarEclipseInfo, options LunarEclipseSVGOptions) []string {
|
||
lines := []string{
|
||
lunarEclipseSVGSummaryText(info, options),
|
||
lunarEclipseSVGMaximumTextValue(info, options),
|
||
lunarEclipseSVGCoordinatesTextValue(info, options),
|
||
lunarEclipseSVGDurationTextValue(info, options),
|
||
lunarEclipseSVGMetaTextValue(info, options),
|
||
}
|
||
filtered := make([]string, 0, len(lines))
|
||
for _, line := range lines {
|
||
if line != "" {
|
||
filtered = append(filtered, line)
|
||
}
|
||
}
|
||
return filtered
|
||
}
|
||
|
||
func lunarEclipseSVGSummaryText(info LunarEclipseInfo, options LunarEclipseSVGOptions) string {
|
||
if options.SummaryText != "" {
|
||
return options.SummaryText
|
||
}
|
||
return lunarEclipseSVGSummary(info, options.Language)
|
||
}
|
||
|
||
func lunarEclipseSVGMaximumTextValue(info LunarEclipseInfo, options LunarEclipseSVGOptions) string {
|
||
if options.MaximumText != "" {
|
||
return options.MaximumText
|
||
}
|
||
return lunarEclipseSVGMaximumText(info, options)
|
||
}
|
||
|
||
func lunarEclipseSVGCoordinatesTextValue(info LunarEclipseInfo, options LunarEclipseSVGOptions) string {
|
||
if options.CoordinatesText != "" {
|
||
return options.CoordinatesText
|
||
}
|
||
coordinates := lunarEclipseSVGMaximumCoordinatesFor(info, options.Language)
|
||
return lunarEclipseSVGMaximumCoordinatesText(coordinates, options.Language)
|
||
}
|
||
|
||
func lunarEclipseSVGDurationTextValue(info LunarEclipseInfo, options LunarEclipseSVGOptions) string {
|
||
if options.DurationText != "" {
|
||
return options.DurationText
|
||
}
|
||
return lunarEclipseSVGDurationSummary(info, options.Language)
|
||
}
|
||
|
||
func lunarEclipseSVGMetaTextValue(info LunarEclipseInfo, options LunarEclipseSVGOptions) string {
|
||
if options.MetaText != "" {
|
||
return options.MetaText
|
||
}
|
||
return lunarEclipseSVGMetaText(info, options.Language)
|
||
}
|
||
|
||
func lunarEclipseSVGContactsTitleText(options LunarEclipseSVGOptions) string {
|
||
if options.ContactsTitle != "" {
|
||
return options.ContactsTitle
|
||
}
|
||
if options.Language == lunarEclipseSVGLanguageEnglish {
|
||
return "Contacts"
|
||
}
|
||
return "接触时刻"
|
||
}
|
||
|
||
func lunarEclipseSVGDirectionTextValue(options LunarEclipseSVGOptions) string {
|
||
if options.DirectionText != "" {
|
||
return options.DirectionText
|
||
}
|
||
return lunarEclipseSVGDirectionText(options.Language)
|
||
}
|
||
|
||
func lunarEclipseSVGFooterNoteText(options LunarEclipseSVGOptions) string {
|
||
if options.FooterNote != "" {
|
||
return options.FooterNote
|
||
}
|
||
note := "图中月面大小和影半径均按实际相对角半径缩放。"
|
||
if options.Language == lunarEclipseSVGLanguageEnglish {
|
||
note = "Moon disks and shadow radii are drawn to the same relative angular-radius scale."
|
||
}
|
||
return note
|
||
}
|
||
|
||
func lunarEclipseSVGHeaderLineY(index int) float64 {
|
||
return 84 + float64(index)*22
|
||
}
|
||
|
||
func lunarEclipseSVGHeaderBottom(lines []string) float64 {
|
||
if len(lines) == 0 {
|
||
return 72
|
||
}
|
||
return lunarEclipseSVGHeaderLineY(len(lines)-1) + 14
|
||
}
|
||
|
||
func lunarEclipseSVGSummary(info LunarEclipseInfo, language string) string {
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
return fmt.Sprintf("type=%s penumbral=%.4f umbral=%.4f",
|
||
lunarEclipseSVGTypeName(info.Type, language), info.PenumbralMagnitude, info.UmbralMagnitude)
|
||
}
|
||
return fmt.Sprintf("食型=%s 半影食分=%.4f 本影食分=%.4f",
|
||
lunarEclipseSVGTypeName(info.Type, language), info.PenumbralMagnitude, info.UmbralMagnitude)
|
||
}
|
||
|
||
func writeLunarEclipseSummary(b *strings.Builder, lines []string, options LunarEclipseSVGOptions) {
|
||
for index, line := range lines {
|
||
fontSize := 13
|
||
fill := "#333"
|
||
if index == 0 {
|
||
fontSize = 14
|
||
fill = "#222"
|
||
}
|
||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="%s" font-family="Georgia, 'Times New Roman', serif" font-size="%d" text-anchor="middle">%s</text>`,
|
||
float64(options.Width)/2, lunarEclipseSVGHeaderLineY(index), fill, fontSize, html.EscapeString(line))
|
||
}
|
||
}
|
||
|
||
func lunarEclipseSVGDirectionText(language string) string {
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
return "North is up and east is left; the ecliptic is projected near greatest eclipse."
|
||
}
|
||
return "上北下南，左东右西；黄道按食甚附近天球投影绘制。"
|
||
}
|
||
|
||
func lunarEclipseSVGMaximumText(info LunarEclipseInfo, options LunarEclipseSVGOptions) string {
|
||
maximum := info.Maximum.In(options.Location).Format("2006-01-02 15:04:05 MST")
|
||
if options.Language == lunarEclipseSVGLanguageEnglish {
|
||
return "Maximum: " + maximum
|
||
}
|
||
return "食甚：" + maximum
|
||
}
|
||
|
||
func lunarEclipseSVGMaximumCoordinatesFor(
|
||
info LunarEclipseInfo,
|
||
language string,
|
||
) lunarEclipseSVGMaximumCoordinates {
|
||
jde := timeToTTJDE(info.Maximum)
|
||
ra, dec := basic.HMoonTrueRaDec(jde)
|
||
lon := basic.HMoonApparentLo(jde)
|
||
lat := basic.HMoonTrueBo(jde)
|
||
code := basic.ConstellationCode(ra, dec, jde)
|
||
name := basic.ConstellationNameByCodeZH(code)
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
name = basic.ConstellationNameByCodeEN(code)
|
||
}
|
||
return lunarEclipseSVGMaximumCoordinates{
|
||
RA: ra,
|
||
Dec: dec,
|
||
EclipticLongitude: lon,
|
||
EclipticLatitude: lat,
|
||
ConstellationCode: code,
|
||
ConstellationName: name,
|
||
}
|
||
}
|
||
|
||
func lunarEclipseSVGMaximumCoordinatesText(
|
||
coordinates lunarEclipseSVGMaximumCoordinates,
|
||
language string,
|
||
) string {
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
return fmt.Sprintf("Moon: RA %s Dec %s ecl.lon %.4f deg ecl.lat %.4f deg %s",
|
||
lunarEclipseSVGFormatRA(coordinates.RA),
|
||
lunarEclipseSVGFormatSignedAngle(coordinates.Dec),
|
||
coordinates.EclipticLongitude,
|
||
coordinates.EclipticLatitude,
|
||
coordinates.ConstellationName,
|
||
)
|
||
}
|
||
return fmt.Sprintf("月球：赤经 %s 赤纬 %s 黄经 %.4f° 黄纬 %.4f° %s",
|
||
lunarEclipseSVGFormatRA(coordinates.RA),
|
||
lunarEclipseSVGFormatSignedAngle(coordinates.Dec),
|
||
coordinates.EclipticLongitude,
|
||
coordinates.EclipticLatitude,
|
||
coordinates.ConstellationName,
|
||
)
|
||
}
|
||
|
||
func lunarEclipseSVGFormatRA(degree float64) string {
|
||
totalSeconds := int(math.Round(normalizeDegree360(degree) / 15 * 3600))
|
||
totalSeconds %= 24 * 3600
|
||
hours := totalSeconds / 3600
|
||
minutes := totalSeconds % 3600 / 60
|
||
seconds := totalSeconds % 60
|
||
return fmt.Sprintf("%02dh%02dm%02ds", hours, minutes, seconds)
|
||
}
|
||
|
||
func lunarEclipseSVGFormatSignedAngle(degree float64) string {
|
||
sign := "+"
|
||
if degree < 0 {
|
||
sign = "-"
|
||
degree = -degree
|
||
}
|
||
totalSeconds := int(math.Round(degree * 3600))
|
||
degrees := totalSeconds / 3600
|
||
minutes := totalSeconds % 3600 / 60
|
||
seconds := totalSeconds % 60
|
||
return fmt.Sprintf("%s%02d°%02d′%02d″", sign, degrees, minutes, seconds)
|
||
}
|
||
|
||
func lunarEclipseSVGDurationSummary(info LunarEclipseInfo, language string) string {
|
||
penumbral := lunarEclipseSVGFormatDuration(info.PenumbralEnd.Sub(info.PenumbralStart))
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
parts := []string{"Penumbral duration " + penumbral}
|
||
if info.HasPartial {
|
||
parts = append(parts, "Umbral duration "+lunarEclipseSVGFormatDuration(info.PartialEnd.Sub(info.PartialStart)))
|
||
}
|
||
if info.HasTotal {
|
||
parts = append(parts, "Total duration "+lunarEclipseSVGFormatDuration(info.TotalEnd.Sub(info.TotalStart)))
|
||
}
|
||
return strings.Join(parts, " ")
|
||
}
|
||
parts := []string{"半影历时 " + penumbral}
|
||
if info.HasPartial {
|
||
parts = append(parts, "本影历时 "+lunarEclipseSVGFormatDuration(info.PartialEnd.Sub(info.PartialStart)))
|
||
}
|
||
if info.HasTotal {
|
||
parts = append(parts, "全食历时 "+lunarEclipseSVGFormatDuration(info.TotalEnd.Sub(info.TotalStart)))
|
||
}
|
||
return strings.Join(parts, " ")
|
||
}
|
||
|
||
func lunarEclipseSVGMetaText(info LunarEclipseInfo, language string) string {
|
||
if !info.HasSaros {
|
||
return ""
|
||
}
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
label := fmt.Sprintf("Lunar Saros %d %d/%d", info.Saros.Series, info.Saros.Member, info.Saros.Count)
|
||
if !info.Saros.Verified {
|
||
label += " (provisional)"
|
||
}
|
||
return label
|
||
}
|
||
label := fmt.Sprintf("沙罗 %d 第 %d/%d 个成员", info.Saros.Series, info.Saros.Member, info.Saros.Count)
|
||
if !info.Saros.Verified {
|
||
label += "（推算）"
|
||
}
|
||
return label
|
||
}
|
||
|
||
func lunarEclipseSVGFormatDuration(duration time.Duration) string {
|
||
if duration < 0 {
|
||
duration = -duration
|
||
}
|
||
totalSeconds := int(duration.Round(time.Second).Seconds())
|
||
hours := totalSeconds / 3600
|
||
minutes := totalSeconds % 3600 / 60
|
||
seconds := totalSeconds % 60
|
||
return fmt.Sprintf("%02d:%02d:%02d", hours, minutes, seconds)
|
||
}
|
||
|
||
func lunarEclipseSVGTypeName(eclipseType LunarEclipseType, language string) string {
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
switch eclipseType {
|
||
case LunarEclipsePenumbral:
|
||
return "Penumbral Lunar Eclipse"
|
||
case LunarEclipsePartial:
|
||
return "Partial Lunar Eclipse"
|
||
case LunarEclipseTotal:
|
||
return "Total Lunar Eclipse"
|
||
default:
|
||
return "No Lunar Eclipse"
|
||
}
|
||
}
|
||
switch eclipseType {
|
||
case LunarEclipsePenumbral:
|
||
return "半影月食"
|
||
case LunarEclipsePartial:
|
||
return "月偏食"
|
||
case LunarEclipseTotal:
|
||
return "月全食"
|
||
default:
|
||
return "无月食"
|
||
}
|
||
}
|
||
|
||
func writeLunarEclipseAxes(
|
||
b *strings.Builder,
|
||
cx, cy, radius float64,
|
||
language string,
|
||
labels *svgchart.LabelTable,
|
||
area svgchart.LabelBox,
|
||
) {
|
||
north, east, west, south := "北", "东", "西", "南"
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
north, east, west, south = "N", "E", "W", "S"
|
||
}
|
||
entries := [4]struct {
|
||
text string
|
||
x, y float64
|
||
}{
|
||
{text: north, x: cx, y: cy - radius - 18},
|
||
{text: east, x: cx - radius - 22, y: cy + 4},
|
||
{text: west, x: cx + radius + 22, y: cy + 4},
|
||
{text: south, x: cx, y: cy + radius + 28},
|
||
}
|
||
for _, entry := range entries {
|
||
candidates := svgchart.LabelCandidates(entry.x, entry.y, "middle", 15)
|
||
placed, ok := labels.Place(entry.text, 14, labelCandidatesInsideBox(candidates, entry.text, 14, area))
|
||
if !ok {
|
||
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 {
|
||
result := make([]lunarEclipseSVGPoint, 0, len(points))
|
||
for _, point := range points {
|
||
distance := math.Hypot(point.X, point.Y)
|
||
positionAngleRad := lunarEclipseMoonCenterPositionAngle(point.JDE) * math.Pi / 180
|
||
result = append(result, lunarEclipseSVGPoint{
|
||
LunarEclipseDiagramPoint: point,
|
||
X: distance * math.Sin(positionAngleRad),
|
||
Y: distance * math.Cos(positionAngleRad),
|
||
})
|
||
}
|
||
return result
|
||
}
|
||
|
||
func writeLunarEclipseEclipticLine(
|
||
b *strings.Builder,
|
||
layout lunarEclipseSVGLayout,
|
||
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 {
|
||
return
|
||
}
|
||
|
||
extent := (diagram.PenumbraRadius + diagram.MoonRadius) * 1.42
|
||
screenStartX := mapX(-unitX * extent)
|
||
screenStartY := mapY(-unitY * extent)
|
||
screenEndX := mapX(unitX * extent)
|
||
screenEndY := mapY(unitY * extent)
|
||
if math.IsNaN(screenStartX) || math.IsNaN(screenStartY) || math.IsNaN(screenEndX) || math.IsNaN(screenEndY) {
|
||
return
|
||
}
|
||
|
||
fmt.Fprintf(b, `<line x1="%.3f" y1="%.3f" x2="%.3f" y2="%.3f" stroke="#555" stroke-width="1" stroke-dasharray="4 3" opacity="0.82"/>`,
|
||
screenStartX, screenStartY, screenEndX, screenEndY)
|
||
|
||
labelX := screenStartX
|
||
labelY := screenStartY
|
||
anchor := "end"
|
||
if screenEndX < screenStartX {
|
||
labelX = screenEndX
|
||
labelY = screenEndY
|
||
}
|
||
labelX -= 8
|
||
if labelX < layout.diagramLeft+18 {
|
||
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>`,
|
||
placed.X, placed.Y, placed.Anchor, html.EscapeString(text))
|
||
}
|
||
|
||
func lunarEclipseSVGEclipticDirection(ttJDE float64) (float64, float64, bool) {
|
||
originRA, originDec := lunarEclipseShadowCenterRaDec(ttJDE)
|
||
centerLongitude := normalizeDegree360(basic.HSunApparentLo(ttJDE) + 180)
|
||
ra1, dec1 := basic.LoBoToRaDec(ttJDE, centerLongitude-1, 0)
|
||
ra2, dec2 := basic.LoBoToRaDec(ttJDE, centerLongitude+1, 0)
|
||
x1, y1 := lunarEclipseSVGTangentOffset(originRA, originDec, ra1, dec1)
|
||
x2, y2 := lunarEclipseSVGTangentOffset(originRA, originDec, ra2, dec2)
|
||
dx := x2 - x1
|
||
dy := y2 - y1
|
||
length := math.Hypot(dx, dy)
|
||
if length == 0 || math.IsNaN(length) || math.IsInf(length, 0) {
|
||
return 0, 0, false
|
||
}
|
||
return dx / length, dy / length, true
|
||
}
|
||
|
||
func lunarEclipseSVGTangentOffset(originRA, originDec, targetRA, targetDec float64) (float64, float64) {
|
||
separation := lunarEclipseSVGAngularSeparation(originRA, originDec, targetRA, targetDec)
|
||
positionAngleRad := lunarEclipsePositionAngle(originRA, originDec, targetRA, targetDec) * math.Pi / 180
|
||
return separation * math.Sin(positionAngleRad), separation * math.Cos(positionAngleRad)
|
||
}
|
||
|
||
func lunarEclipseSVGAngularSeparation(ra1, dec1, ra2, dec2 float64) float64 {
|
||
ra1Rad := ra1 * math.Pi / 180
|
||
dec1Rad := dec1 * math.Pi / 180
|
||
ra2Rad := ra2 * math.Pi / 180
|
||
dec2Rad := dec2 * math.Pi / 180
|
||
cosDistance := math.Sin(dec1Rad)*math.Sin(dec2Rad) +
|
||
math.Cos(dec1Rad)*math.Cos(dec2Rad)*math.Cos(ra2Rad-ra1Rad)
|
||
if cosDistance > 1 {
|
||
cosDistance = 1
|
||
}
|
||
if cosDistance < -1 {
|
||
cosDistance = -1
|
||
}
|
||
return math.Acos(cosDistance) * 180 / math.Pi
|
||
}
|
||
|
||
func lunarEclipseSVGLabelEcliptic(language string) string {
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
return "Ecliptic"
|
||
}
|
||
return "黄道"
|
||
}
|
||
|
||
func writeLunarEclipseShadowLabels(
|
||
b *strings.Builder,
|
||
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"
|
||
}
|
||
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 {
|
||
events := make([]lunarEclipseSVGPoint, 0, 7)
|
||
for _, point := range points {
|
||
for _, label := range lunarEclipseSVGPointLabels(point) {
|
||
event := point
|
||
event.Label = label
|
||
event.Labels = []string{label}
|
||
events = append(events, event)
|
||
}
|
||
}
|
||
return events
|
||
}
|
||
|
||
func lunarEclipseSVGPointLabels(point lunarEclipseSVGPoint) []string {
|
||
if len(point.Labels) > 0 {
|
||
return point.Labels
|
||
}
|
||
if point.Label == "" {
|
||
return nil
|
||
}
|
||
return []string{point.Label}
|
||
}
|
||
|
||
func writeLunarEclipseMoon(
|
||
b *strings.Builder,
|
||
point lunarEclipseSVGPoint,
|
||
diagram basic.LunarEclipseDiagramResult,
|
||
x, y, scale float64,
|
||
greatest bool,
|
||
) {
|
||
radius := diagram.MoonRadius * scale
|
||
opacity := 0.64
|
||
if greatest {
|
||
opacity = 0.9
|
||
}
|
||
fmt.Fprintf(b, `<g class="event-moon">`)
|
||
fmt.Fprintf(b, `<use href="#le-moon" x="%.3f" y="%.3f" width="%.3f" height="%.3f" opacity="%.2f"/>`,
|
||
x-radius, y-radius, radius*2, radius*2, opacity)
|
||
if lunarEclipseSVGDeepUmbra(point.LunarEclipseDiagramPoint, diagram) {
|
||
tintOpacity := 0.46
|
||
if greatest {
|
||
tintOpacity = 0.58
|
||
}
|
||
fmt.Fprintf(b, `<circle cx="%.3f" cy="%.3f" r="%.3f" fill="#d66f1f" opacity="%.2f"/>`,
|
||
x, y, radius, tintOpacity)
|
||
}
|
||
fmt.Fprintf(b, `<circle cx="%.3f" cy="%.3f" r="%.3f" fill="none" stroke="#b9b9b9" stroke-width="0.8" opacity="0.9"/>`, x, y, radius)
|
||
b.WriteString(`</g>`)
|
||
}
|
||
|
||
func lunarEclipseSVGDeepUmbra(point basic.LunarEclipseDiagramPoint, diagram basic.LunarEclipseDiagramResult) bool {
|
||
return math.Hypot(point.X, point.Y) < diagram.UmbraRadius+diagram.MoonRadius*0.75
|
||
}
|
||
|
||
func writeLunarEclipseEventLabel(
|
||
b *strings.Builder,
|
||
label string,
|
||
x, y, cx, moonRadius float64,
|
||
language string,
|
||
) {
|
||
text := lunarEclipseSVGEventName(label, language)
|
||
dx := moonRadius*0.72 + 6
|
||
anchor := "start"
|
||
if x < cx {
|
||
dx = -dx
|
||
anchor = "end"
|
||
}
|
||
dy := -moonRadius*0.35 - 4
|
||
if label == "Greatest" {
|
||
dy = moonRadius + 15
|
||
anchor = "middle"
|
||
dx = 0
|
||
}
|
||
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>`,
|
||
x+dx, y+dy, anchor, html.EscapeString(text))
|
||
}
|
||
|
||
func lunarEclipseSVGEventName(label, language string) string {
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
switch label {
|
||
case "Greatest":
|
||
return "Greatest"
|
||
default:
|
||
return label
|
||
}
|
||
}
|
||
switch label {
|
||
case "P1":
|
||
return "P1 半影始"
|
||
case "U1":
|
||
return "U1 初亏"
|
||
case "U2":
|
||
return "U2 食既"
|
||
case "Greatest":
|
||
return "食甚"
|
||
case "U3":
|
||
return "U3 生光"
|
||
case "U4":
|
||
return "U4 复圆"
|
||
case "P4":
|
||
return "P4 半影终"
|
||
default:
|
||
return label
|
||
}
|
||
}
|
||
|
||
type lunarEclipseSVGContact struct {
|
||
label string
|
||
name string
|
||
time time.Time
|
||
angle float64
|
||
hasAngle bool
|
||
}
|
||
|
||
func writeLunarEclipseContacts(
|
||
b *strings.Builder,
|
||
info LunarEclipseInfo,
|
||
options LunarEclipseSVGOptions,
|
||
x, y float64,
|
||
) {
|
||
contacts := lunarEclipseSVGContacts(info, options.Language)
|
||
if len(contacts) == 0 {
|
||
return
|
||
}
|
||
title := lunarEclipseSVGContactsTitleText(options)
|
||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#111" font-family="Georgia, 'Times New Roman', serif" font-size="13" font-weight="700">%s (%s)</text>`,
|
||
x, y, html.EscapeString(title), html.EscapeString(options.Location.String()))
|
||
for index, contact := range contacts {
|
||
line := fmt.Sprintf("%s %s %s", contact.label, contact.name, contact.time.In(options.Location).Format("15:04:05"))
|
||
if contact.hasAngle {
|
||
if options.Language == lunarEclipseSVGLanguageEnglish {
|
||
line = fmt.Sprintf("%s PA %.1f°", line, contact.angle)
|
||
} else {
|
||
line = fmt.Sprintf("%s 方位 %.1f°", line, contact.angle)
|
||
}
|
||
}
|
||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#222" font-family="Georgia, 'Times New Roman', serif" font-size="12">%s</text>`,
|
||
x, y+float64(index+1)*18, html.EscapeString(line))
|
||
}
|
||
}
|
||
|
||
func writeLunarEclipseFooter(
|
||
b *strings.Builder,
|
||
info LunarEclipseInfo,
|
||
options LunarEclipseSVGOptions,
|
||
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(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 {
|
||
angles := lunarEclipseContactAngleMap(info.ContactPoints)
|
||
contacts := []lunarEclipseSVGContact{
|
||
lunarEclipseSVGContactFor("P1", lunarEclipseSVGContactName("P1", language), info.PenumbralStart, angles),
|
||
}
|
||
if info.HasPartial {
|
||
contacts = append(contacts, lunarEclipseSVGContactFor("U1", lunarEclipseSVGContactName("U1", language), info.PartialStart, angles))
|
||
}
|
||
if info.HasTotal {
|
||
contacts = append(contacts, lunarEclipseSVGContactFor("U2", lunarEclipseSVGContactName("U2", language), info.TotalStart, angles))
|
||
}
|
||
contacts = append(contacts, lunarEclipseSVGContact{label: "GE", name: lunarEclipseSVGContactName("Greatest", language), time: info.Maximum})
|
||
if info.HasTotal {
|
||
contacts = append(contacts, lunarEclipseSVGContactFor("U3", lunarEclipseSVGContactName("U3", language), info.TotalEnd, angles))
|
||
}
|
||
if info.HasPartial {
|
||
contacts = append(contacts, lunarEclipseSVGContactFor("U4", lunarEclipseSVGContactName("U4", language), info.PartialEnd, angles))
|
||
}
|
||
contacts = append(contacts, lunarEclipseSVGContactFor("P4", lunarEclipseSVGContactName("P4", language), info.PenumbralEnd, angles))
|
||
return contacts
|
||
}
|
||
|
||
func lunarEclipseSVGContactFor(
|
||
label, name string,
|
||
time time.Time,
|
||
angles map[string]float64,
|
||
) lunarEclipseSVGContact {
|
||
angle, ok := angles[label]
|
||
return lunarEclipseSVGContact{
|
||
label: label,
|
||
name: name,
|
||
time: time,
|
||
angle: angle,
|
||
hasAngle: ok,
|
||
}
|
||
}
|
||
|
||
func lunarEclipseContactAngleMap(points []LunarEclipseContactPoint) map[string]float64 {
|
||
angles := make(map[string]float64, len(points))
|
||
for _, point := range points {
|
||
angles[point.Label] = point.ContactPositionAngle
|
||
}
|
||
return angles
|
||
}
|
||
|
||
func lunarEclipseSVGContactName(label, language string) string {
|
||
if language == lunarEclipseSVGLanguageEnglish {
|
||
switch label {
|
||
case "P1":
|
||
return "Penumbral begins"
|
||
case "U1":
|
||
return "Partial begins"
|
||
case "U2":
|
||
return "Total begins"
|
||
case "Greatest":
|
||
return "Greatest"
|
||
case "U3":
|
||
return "Total ends"
|
||
case "U4":
|
||
return "Partial ends"
|
||
case "P4":
|
||
return "Penumbral ends"
|
||
default:
|
||
return label
|
||
}
|
||
}
|
||
switch label {
|
||
case "P1":
|
||
return "半影始"
|
||
case "U1":
|
||
return "初亏"
|
||
case "U2":
|
||
return "食既"
|
||
case "Greatest":
|
||
return "食甚"
|
||
case "U3":
|
||
return "生光"
|
||
case "U4":
|
||
return "复圆"
|
||
case "P4":
|
||
return "半影终"
|
||
default:
|
||
return label
|
||
}
|
||
}
|
||
|
||
func durationToDays(duration time.Duration) float64 {
|
||
if duration <= 0 {
|
||
return 0
|
||
}
|
||
return duration.Hours() / 24
|
||
}
|