feat: 完善水星与金星全球凌日搜索及制图导出
- 基于平均下合周期与节点相位预筛候选，减少无效星历计算；跳过无法求解的单个会合周期，避免有限覆盖星历导致搜索提前终止 - 引入影轴 γ、半影半径及地球尺度几何判定，结合站心可见性识别地心无接触、仅部分地区可见的掠凌 - 添加金星 243 年、水星 46 年周期族编号，并明确编号适用范围及未分配时的零值语义 - 为 SVG、GeoJSON 和 KML 增加站心部分凌日可见区，适配接触等时线、几何元数据、图层样式及取景；为地心无接触凌日事件增加正射图，按可见区球面面积加权居中
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@@ -36,9 +36,9 @@ type TransitIsochrones uint8
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const (
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// TransitIsochroneC1 画一触等时线 / draw C1 isochrones.
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TransitIsochroneC1 TransitIsochrones = 1 << iota
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// TransitIsochroneC2 画二触等时线；掠凌没有内切接触时忽略 / draw C2 isochrones, ignored for a grazing transit.
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// TransitIsochroneC2 画二触等时线；地表没有站心内切时忽略 / draw C2 isochrones, ignored where no site has internal contact.
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TransitIsochroneC2
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// TransitIsochroneC3 画三触等时线；掠凌没有内切接触时忽略 / draw C3 isochrones, ignored for a grazing transit.
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// TransitIsochroneC3 画三触等时线；地表没有站心内切时忽略 / draw C3 isochrones, ignored where no site has internal contact.
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TransitIsochroneC3
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// TransitIsochroneC4 画四触等时线 / draw C4 isochrones.
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TransitIsochroneC4
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@@ -64,8 +64,7 @@ type TransitMapSVGOptions struct {
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// TimeScale 选择图中时刻的时标：零值 UTC；TimeScaleUT1 要求 Location 为 nil 或 UTC，否则返回 false。
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// TimeScale selects the label scale: the zero value is UTC; TimeScaleUT1 requires Location to be nil or UTC, otherwise the renderer returns false.
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TimeScale astro.TimeScale
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// Projection 选择地图投影；零值使用等经纬投影，正射投影视点取凌甚时的太阳直射点。
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// Projection selects the map projection. The zero value uses equirectangular; orthographic centres on the subsolar point at greatest.
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// Projection 选择地图投影，默认等经纬；正射视点在地心无接触时取站心可见区中心，否则取凌甚太阳直射点 / projection, default equirectangular; orthographic centres on the visible footprint without geocentric contacts, otherwise the subsolar point at greatest.
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Projection EclipseMapProjection
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// Isochrones 选择要画的站心接触等时线，可按位组合；零值不画（默认关闭，需显式开启）。
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// Isochrones selects the topocentric contact isochrones to draw and may combine flags. The zero value draws none (off by default).
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@@ -79,12 +78,14 @@ type TransitMapSVGOptions struct {
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FooterNote string
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}
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// TransitMapSVG 绘制距 date 最近一次水星或金星凌日的全球可见图：按一触、凌甚、四触太阳中心在视地平上
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// （计入标准大气折射）的区域分区；Options.Isochrones 显式开启时叠加所选接触的站心等时线。找不到凌日或选项无效时返回 false。
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// TransitMapSVG renders the global visibility of the Mercury or Venus transit closest to date: regions follow where the
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// Sun's centre is above the apparent horizon (standard refraction) at C1, greatest and C4. Topocentric isochrones of the
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// selected contacts are overlaid only when Options.Isochrones enables them. It returns false when no transit is found
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// or the options are invalid.
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// TransitMapSVG 绘制距 date 最近一次水星或金星凌日的全球可见图：普通凌日按一触、凌甚、四触太阳中心在视地平上
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// （计入标准大气折射）的区域分区，地心无接触时绘制站心部分凌日可见区；Options.Isochrones 显式开启时叠加所选接触的
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// 站心等时线，图例只列实际画出的接触。找不到凌日或选项无效时返回 false。
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// TransitMapSVG renders the global visibility of the Mercury or Venus transit closest to date: ordinary transits are
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// partitioned by whether the Sun's centre is above the apparent horizon (standard refraction) at C1, greatest and C4;
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// events without geocentric contacts show the topocentric partial-transit footprint. Topocentric isochrones of the
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// selected contacts are overlaid only when Options.Isochrones enables them, and the legend lists only contacts that
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// produced lines. It returns false when no transit is found or the options are invalid.
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func TransitMapSVG(planet TransitPlanet, date time.Time, options TransitMapSVGOptions) (string, bool) {
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transit, ok := closestPlanetTransit(planet, date)
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if !ok || !validEclipseMapProjection(options.Projection) {
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@@ -97,7 +98,7 @@ func TransitMapSVG(planet TransitPlanet, date time.Time, options TransitMapSVGOp
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options.Location = time.UTC
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}
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options = normalizeTransitMapSVGOptions(date, options)
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if !transit.HasInternal {
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if !transit.HasExternal {
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options.Isochrones &^= TransitIsochroneC2 | TransitIsochroneC3
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}
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options.Isochrones &= TransitIsochroneAll
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@@ -114,7 +115,7 @@ func TransitMapSVG(planet TransitPlanet, date time.Time, options TransitMapSVGOp
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return renderTransitMapSVG(planet, transit, options, projection), true
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}
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// closestPlanetTransit 返回距 date 最近的一次地心凌日；行星无效或找不到时第二个返回值为 false。
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// closestPlanetTransit 返回距 date 最近的一次全球凌日。
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func closestPlanetTransit(planet TransitPlanet, date time.Time) (basic.PlanetTransitResult, bool) {
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jd := basic.Date2JD(date.UTC())
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var transit basic.PlanetTransitResult
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@@ -155,7 +156,12 @@ type transitMapContacts struct {
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}
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func transitMapContactsOf(transit basic.PlanetTransitResult) transitMapContacts {
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at := func(jd float64) time.Time { return basic.JD2DateByZone(jd, time.UTC, false) }
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at := func(jd float64) time.Time {
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if jd == 0 {
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return time.Time{}
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}
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return basic.JD2DateByZone(jd, time.UTC, false)
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}
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contacts := transitMapContacts{
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start: at(transit.ExternalIngress),
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greatest: at(transit.Greatest),
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@@ -178,7 +184,7 @@ func renderTransitMapSVG(
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// 底部比月食图多留两行：图例下要放可折行的说明与时标声明。
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frame := eclipseMapFrame(options.Width, options.Height, projection, 142, 122)
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if projection == svgmap.ProjectionOrthographic {
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center := solarEclipseSubsolarPoint(contacts.greatest)
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center := transitMapOrthographicCenter(transit)
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frame.CenterLongitude, frame.CenterLatitude = center.Longitude, center.Latitude
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}
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title := options.Title
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@@ -192,8 +198,12 @@ func renderTransitMapSVG(
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}
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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" role="img" aria-label="%s">`,
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fmt.Fprintf(&b, `<svg xmlns="http://www.w3.org/2000/svg" width="%d" height="%d" viewBox="0 0 %d %d" role="img" aria-label="%s"`,
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options.Width, options.Height, options.Width, options.Height, html.EscapeString(title))
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if projection == svgmap.ProjectionOrthographic {
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fmt.Fprintf(&b, ` data-center-longitude="%.6f" data-center-latitude="%.6f"`, frame.CenterLongitude, frame.CenterLatitude)
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}
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b.WriteString(`>`)
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b.WriteString(`<defs>`)
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writeTransitMapDefinitions(&b, frame, contacts)
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b.WriteString(`</defs>`)
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@@ -211,13 +221,15 @@ func renderTransitMapSVG(
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frame.WriteOcean(&b)
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frame.WriteGraticule(&b, "transit-map-clip")
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frame.WriteLand(&b, "transit-map-clip")
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writeTransitMapRegions(&b, frame, contacts)
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if options.Isochrones != 0 {
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writeTransitMapIsochrones(&b, frame, transit, options)
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if transit.HasExternal {
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writeTransitMapRegions(&b, frame, contacts)
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} else {
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writeTransitMapPartialRegions(&b, frame, transit)
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}
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options.Isochrones = writeTransitMapIsochrones(&b, frame, transit, options)
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frame.WriteFrame(&b)
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legendRows := writeTransitMapLegend(&b, frame, float64(options.Width), options)
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writeTransitMapFooter(&b, frame, options, projection, contacts.greatest, legendRows)
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legendRows := writeTransitMapLegend(&b, frame, float64(options.Width), options, transit.HasExternal)
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writeTransitMapFooter(&b, frame, options, projection, contacts.greatest, legendRows, transit.HasExternal)
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b.WriteString(`</svg>`)
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return b.String()
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}
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@@ -264,6 +276,9 @@ const (
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// writeTransitMapDefinitions 输出一触、凌甚、四触三个太阳在地平上半球的形状与排除掩膜，分区口径同月食可见图。
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func writeTransitMapDefinitions(b *strings.Builder, frame svgmap.Frame, contacts transitMapContacts) {
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b.WriteString(frame.ClipDefinition("transit-map-clip"))
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if contacts.start.IsZero() || contacts.end.IsZero() {
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return
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}
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startPath, _ := transitMapSunUpPath(contacts.start, frame)
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endPath, _ := transitMapSunUpPath(contacts.end, frame)
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greatestPath, _ := transitMapSunUpPath(contacts.greatest, frame)
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@@ -285,10 +300,19 @@ const (
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transitMapColorSunrise = "#4e9da0"
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transitMapColorSunset = "#e2aa4b"
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transitMapColorNone = "#747b7d"
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transitMapColorPartial = "#f7dd93"
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transitMapColorC1 = "#a3392f"
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transitMapColorC2 = "#c0702a"
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transitMapColorC3 = "#7a4ca0"
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transitMapColorC4 = "#2f5ea3"
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transitMapFooterSideInset = 120.0
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transitMapRegionFillOpacity = 0.34
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// 部分凌日只有一块可见区，要比普通凌日分区更浓才能从底图上辨认。
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transitMapPartialFillOpacity = 0.55
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// 图例色块直接画在白底上，比叠在海陆底色上的分区取更浓的值，同月食图。
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transitMapLegendFillOpacity = 0.78
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)
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// writeTransitMapRegions 着色四类可见区：全程可见、日出时凌日已开始、日落时凌日未结束、不可见。
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@@ -298,25 +322,27 @@ func writeTransitMapRegions(b *strings.Builder, frame svgmap.Frame, contacts tra
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_, endBoundary := transitMapSunUpPath(contacts.end, frame)
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fmt.Fprintf(b, `<g class="transit-visibility-regions" data-source="%s" clip-path="url(#transit-map-clip)">`, eclipseMapSourceTransitVisibilityRegions)
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if frame.IsPolar() {
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fmt.Fprintf(b, `<circle class="transit-not-visible-region" mask="url(#transit-not-visible-mask)" cx="%.3f" cy="%.3f" r="%.3f" fill="%s" fill-opacity="0.34"/>`,
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frame.X+frame.Width/2, frame.Y+frame.Height/2, frame.Width/2, transitMapColorNone)
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fmt.Fprintf(b, `<circle class="transit-not-visible-region" mask="url(#transit-not-visible-mask)" cx="%.3f" cy="%.3f" r="%.3f" fill="%s" fill-opacity="%.2f"/>`,
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frame.X+frame.Width/2, frame.Y+frame.Height/2, frame.Width/2, transitMapColorNone, transitMapRegionFillOpacity)
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} else {
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fmt.Fprintf(b, `<rect class="transit-not-visible-region" mask="url(#transit-not-visible-mask)" x="%.3f" y="%.3f" width="%.3f" height="%.3f" fill="%s" fill-opacity="0.34"/>`,
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frame.X, frame.Y, frame.Width, frame.Height, transitMapColorNone)
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fmt.Fprintf(b, `<rect class="transit-not-visible-region" mask="url(#transit-not-visible-mask)" x="%.3f" y="%.3f" width="%.3f" height="%.3f" fill="%s" fill-opacity="%.2f"/>`,
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frame.X, frame.Y, frame.Width, frame.Height, transitMapColorNone, transitMapRegionFillOpacity)
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}
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fmt.Fprintf(b, `<use class="transit-sunset-region" mask="url(#transit-not-c4-mask)" href="#transit-sun-c1-shape" fill="%s" fill-opacity="0.34"/>`, transitMapColorSunset)
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fmt.Fprintf(b, `<use class="transit-sunrise-region" mask="url(#transit-not-c1-mask)" href="#transit-sun-c4-shape" fill="%s" fill-opacity="0.34"/>`, transitMapColorSunrise)
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fmt.Fprintf(b, `<g clip-path="url(#transit-sun-c4)"><g clip-path="url(#transit-sun-greatest)"><use class="transit-entire-region" href="#transit-sun-c1-shape" fill="%s" fill-opacity="0.34"/></g></g>`, transitMapColorEntire)
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fmt.Fprintf(b, `<g clip-path="url(#transit-sun-c4)"><g mask="url(#transit-not-greatest-mask)"><use class="transit-sunset-region" href="#transit-sun-c1-shape" fill="%s" fill-opacity="0.34"/></g></g>`, transitMapColorSunset)
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fmt.Fprintf(b, `<g mask="url(#transit-not-c1-c4-mask)"><use class="transit-sunset-region" href="#transit-sun-greatest-shape" fill="%s" fill-opacity="0.34"/></g>`, transitMapColorSunset)
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fmt.Fprintf(b, `<use class="transit-sunset-region" mask="url(#transit-not-c4-mask)" href="#transit-sun-c1-shape" fill="%s" fill-opacity="%.2f"/>`, transitMapColorSunset, transitMapRegionFillOpacity)
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fmt.Fprintf(b, `<use class="transit-sunrise-region" mask="url(#transit-not-c1-mask)" href="#transit-sun-c4-shape" fill="%s" fill-opacity="%.2f"/>`, transitMapColorSunrise, transitMapRegionFillOpacity)
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fmt.Fprintf(b, `<g clip-path="url(#transit-sun-c4)"><g clip-path="url(#transit-sun-greatest)"><use class="transit-entire-region" href="#transit-sun-c1-shape" fill="%s" fill-opacity="%.2f"/></g></g>`, transitMapColorEntire, transitMapRegionFillOpacity)
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fmt.Fprintf(b, `<g clip-path="url(#transit-sun-c4)"><g mask="url(#transit-not-greatest-mask)"><use class="transit-sunset-region" href="#transit-sun-c1-shape" fill="%s" fill-opacity="%.2f"/></g></g>`, transitMapColorSunset, transitMapRegionFillOpacity)
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fmt.Fprintf(b, `<g mask="url(#transit-not-c1-c4-mask)"><use class="transit-sunset-region" href="#transit-sun-greatest-shape" fill="%s" fill-opacity="%.2f"/></g>`, transitMapColorSunset, transitMapRegionFillOpacity)
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b.WriteString(`</g>`)
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writeEclipseMapGeoLine(b, frame, startBoundary, "c1-horizon", "#a56c16", 1.2, "4 3", "transit-map-clip", eclipseMapSourceTransitHorizonBoundaries)
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writeEclipseMapGeoLine(b, frame, endBoundary, "c4-horizon", "#197a82", 1.2, "4 3", "transit-map-clip", eclipseMapSourceTransitHorizonBoundaries)
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}
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// writeTransitMapIsochrones 画选中接触的站心等时线：每条线是同一时刻看到该接触的地点，只保留该时刻太阳在视地平上的部分。
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// 返回实际画出线的接触，供图例使用。
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// 每隔若干条标一次时刻，标签按 LabelTable 避让。
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func writeTransitMapIsochrones(b *strings.Builder, frame svgmap.Frame, transit basic.PlanetTransitResult, options TransitMapSVGOptions) {
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func writeTransitMapIsochrones(b *strings.Builder, frame svgmap.Frame, transit basic.PlanetTransitResult, options TransitMapSVGOptions) TransitIsochrones {
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var drawn TransitIsochrones
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table := &svgchart.LabelTable{}
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format := "15:04"
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if options.IsochroneStep%time.Minute != 0 {
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@@ -337,6 +363,9 @@ func writeTransitMapIsochrones(b *strings.Builder, frame svgmap.Frame, transit b
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continue
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}
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lines := basic.PlanetTransitContactIsochrones(transit, contact.kind, options.IsochroneStep)
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if len(lines) > 0 {
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drawn |= contact.flag
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}
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labelEvery := transitMapIsochroneLabelEvery(len(lines))
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for index, line := range lines {
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segments := make([][]svgmap.GeoPoint, 0, len(line.Segments))
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@@ -360,6 +389,7 @@ func writeTransitMapIsochrones(b *strings.Builder, frame svgmap.Frame, transit b
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contact.class, placement.X, placement.Y, contact.color, placement.Anchor, html.EscapeString(text))
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}
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}
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return drawn
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}
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// transitMapIsochroneLabelEvery 让每个接触最多标八条线。
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@@ -413,7 +443,10 @@ func writeTransitMapSummary(b *strings.Builder, transit basic.PlanetTransitResul
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if options.Language == "en" {
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greatest, separation = "Greatest", "least separation"
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}
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parts := []string{"C1 " + clock(contacts.start)}
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parts := []string{}
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if !contacts.start.IsZero() {
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parts = append(parts, "C1 "+clock(contacts.start))
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}
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if contacts.hasInternal {
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parts = append(parts, "C2 "+clock(contacts.internalStart))
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}
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@@ -421,7 +454,13 @@ func writeTransitMapSummary(b *strings.Builder, transit basic.PlanetTransitResul
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if contacts.hasInternal {
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parts = append(parts, "C3 "+clock(contacts.internalEnd))
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}
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parts = append(parts, "C4 "+clock(contacts.end))
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if !contacts.end.IsZero() {
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parts = append(parts, "C4 "+clock(contacts.end))
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} else if options.Language == "en" {
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parts = append(parts, "Partial transit; no geocentric contacts")
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} else {
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parts = append(parts, "仅部分凌日，地心无接触")
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}
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line := fmt.Sprintf("%s (%s)", strings.Join(parts, " | "), zone)
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fmt.Fprintf(b, `<text x="%.3f" y="82" fill="#293235" font-family="Arial, sans-serif" font-size="13" text-anchor="middle">%s</text>`,
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float64(options.Width)/2, html.EscapeString(svgchart.EllipsizeText(line, float64(options.Width)-60, 13)))
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@@ -432,23 +471,33 @@ func writeTransitMapSummary(b *strings.Builder, transit basic.PlanetTransitResul
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transit.MinimumSeparationArcsec, transit.SunSemidiameterArcsec, transit.PlanetSemidiameterArcsec)
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}
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fmt.Fprintf(b, `<text x="%.3f" y="100" fill="#293235" font-family="Arial, sans-serif" font-size="13" text-anchor="middle">%s</text>`,
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float64(options.Width)/2, html.EscapeString(note))
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float64(options.Width)/2, html.EscapeString(svgchart.EllipsizeText(transitMapGeometryNote(transit, options.Language)+" | "+note, float64(options.Width)-60, 13)))
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}
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// writeTransitMapLegend 画区域色块与等时线图例，按画布宽度折行，返回行数。
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func writeTransitMapLegend(b *strings.Builder, frame svgmap.Frame, canvasWidth float64, options TransitMapSVGOptions) int {
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type entry struct {
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text, color string
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line bool
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}
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type transitMapLegendEntry struct {
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text, color string
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line bool
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}
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// transitMapLegendEntries 列出图例项：地心无接触时是部分凌日可见区，否则是四个分区；两者都追加实际画出的等时线。
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||||
func transitMapLegendEntries(options TransitMapSVGOptions, hasExternal bool) []transitMapLegendEntry {
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labels := []string{"全程可见", "日出时已在凌日", "日落时仍在凌日", "不可见", "一触等时线", "二触等时线", "三触等时线", "四触等时线"}
|
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if options.Language == "en" {
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||||
labels = []string{"Entire transit", "Transit at sunrise", "Transit at sunset", "Not visible",
|
||||
"C1 isochrones", "C2 isochrones", "C3 isochrones", "C4 isochrones"}
|
||||
}
|
||||
entries := []entry{
|
||||
{labels[0], transitMapColorEntire, false}, {labels[1], transitMapColorSunrise, false},
|
||||
{labels[2], transitMapColorSunset, false}, {labels[3], transitMapColorNone, false},
|
||||
var entries []transitMapLegendEntry
|
||||
if !hasExternal {
|
||||
partial := "部分凌日可见区"
|
||||
if options.Language == "en" {
|
||||
partial = "Partial transit visible"
|
||||
}
|
||||
entries = []transitMapLegendEntry{{partial, transitMapColorPartial, false}}
|
||||
} else {
|
||||
entries = []transitMapLegendEntry{
|
||||
{labels[0], transitMapColorEntire, false}, {labels[1], transitMapColorSunrise, false},
|
||||
{labels[2], transitMapColorSunset, false}, {labels[3], transitMapColorNone, false},
|
||||
}
|
||||
}
|
||||
for index, item := range []struct {
|
||||
flag TransitIsochrones
|
||||
@@ -458,14 +507,20 @@ func writeTransitMapLegend(b *strings.Builder, frame svgmap.Frame, canvasWidth f
|
||||
{TransitIsochroneC3, transitMapColorC3}, {TransitIsochroneC4, transitMapColorC4},
|
||||
} {
|
||||
if options.Isochrones&item.flag != 0 {
|
||||
entries = append(entries, entry{labels[4+index], item.color, true})
|
||||
entries = append(entries, transitMapLegendEntry{labels[4+index], item.color, true})
|
||||
}
|
||||
}
|
||||
width := func(item entry) float64 {
|
||||
return entries
|
||||
}
|
||||
|
||||
// writeTransitMapLegend 画区域色块与等时线图例，按画布宽度折行，返回行数。
|
||||
func writeTransitMapLegend(b *strings.Builder, frame svgmap.Frame, canvasWidth float64, options TransitMapSVGOptions, hasExternal bool) int {
|
||||
entries := transitMapLegendEntries(options, hasExternal)
|
||||
var rows [][]transitMapLegendEntry
|
||||
width := func(item transitMapLegendEntry) float64 {
|
||||
return lunarEclipseDetailedMapLegendIconWidth + svgchart.EstimatedTextWidth(item.text, lunarEclipseDetailedMapLegendFontSize)
|
||||
}
|
||||
available := canvasWidth - 2*lunarEclipseDetailedPageInset
|
||||
var rows [][]entry
|
||||
used := 0.0
|
||||
for _, item := range entries {
|
||||
if len(rows) == 0 || used+lunarEclipseDetailedMapLegendGap+width(item) > available {
|
||||
@@ -487,7 +542,7 @@ func writeTransitMapLegend(b *strings.Builder, frame svgmap.Frame, canvasWidth f
|
||||
if item.line {
|
||||
fmt.Fprintf(b, `<line x1="%.3f" y1="%.3f" x2="%.3f" y2="%.3f" stroke="%s" stroke-width="1.4"/>`, x, y-4, x+18, y-4, item.color)
|
||||
} else {
|
||||
fmt.Fprintf(b, `<rect x="%.3f" y="%.3f" width="18" height="9" fill="%s" fill-opacity="0.78"/>`, x, y-8, item.color)
|
||||
fmt.Fprintf(b, `<rect x="%.3f" y="%.3f" width="18" height="9" fill="%s" fill-opacity="%.2f"/>`, x, y-8, item.color, transitMapLegendFillOpacity)
|
||||
}
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#465053" font-family="Arial, sans-serif" font-size="%.0f">%s</text>`,
|
||||
x+lunarEclipseDetailedMapLegendIconWidth, y, lunarEclipseDetailedMapLegendFontSize, html.EscapeString(item.text))
|
||||
@@ -504,17 +559,25 @@ func writeTransitMapFooter(
|
||||
projection svgmap.Projection,
|
||||
instant time.Time,
|
||||
legendRows int,
|
||||
hasExternal bool,
|
||||
) {
|
||||
text := options.FooterNote
|
||||
if text == "" {
|
||||
projectionLabel := transitMapProjectionLabel(projection, hasExternal, options.Language)
|
||||
if options.Language == "en" {
|
||||
text = eclipseMapProjectionLabel(projection, "en") + "; regions follow whether the Sun's centre is above the apparent horizon (standard refraction) at C1, greatest and C4"
|
||||
text = projectionLabel + "; regions follow whether the Sun's centre is above the apparent horizon (standard refraction) at C1, greatest and C4"
|
||||
if !hasExternal {
|
||||
text = projectionLabel + "; shaded footprint uses topocentric disk overlap and apparent-horizon visibility (standard refraction)"
|
||||
}
|
||||
if options.Isochrones != 0 {
|
||||
text += "; isochrones are topocentric contact times"
|
||||
}
|
||||
text += "."
|
||||
} else {
|
||||
text = eclipseMapProjectionLabel(projection, "zh") + "；按一触、凌甚、四触太阳中心是否在视地平上分区（计入标准大气折射）"
|
||||
text = projectionLabel + "；按一触、凌甚、四触太阳中心是否在视地平上分区（计入标准大气折射）"
|
||||
if !hasExternal {
|
||||
text = projectionLabel + "；着色区域按站心圆面相交与视地平可见性计算（计入标准大气折射）"
|
||||
}
|
||||
if options.Isochrones != 0 {
|
||||
text += "；等时线为站心接触时刻"
|
||||
}
|
||||
@@ -525,12 +588,18 @@ func writeTransitMapFooter(
|
||||
// 页脚紧跟图例末行，不与图例重叠；行数按画布底边截断，时标声明独占最后一行。
|
||||
|
||||
baseline := frame.Y + frame.Height + 31 + float64(legendRows-1)*lunarEclipseDetailedMapLegendLineStep + 18
|
||||
x, anchor := frame.X, "start"
|
||||
maxWidth := float64(options.Width) - frame.X - 24
|
||||
// 球面投影的盘面居中而左缘靠里，页脚改为随图例居中，否则文字整体右偏。
|
||||
if frame.IsDisk() {
|
||||
x, anchor = float64(options.Width)/2, "middle"
|
||||
maxWidth = float64(options.Width) - 2*transitMapFooterSideInset
|
||||
}
|
||||
lines := svgchart.WrapText(text, maxWidth, 11)
|
||||
lines = svgchart.FooterLinesWithScale(lines, timenote.Scale(options.TimeScale, instant, options.Location, options.Language), maxWidth, 11,
|
||||
svgchart.BaselineLineLimit(11, svgchart.FooterLineHeight(11), baseline, float64(options.Height)-footerBottomPadding))
|
||||
for index, line := range lines {
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#596164" font-family="Georgia, 'Times New Roman', serif" font-size="11">%s</text>`,
|
||||
frame.X, baseline+float64(index)*svgchart.FooterLineHeight(11), html.EscapeString(line))
|
||||
fmt.Fprintf(b, `<text x="%.3f" y="%.3f" fill="#596164" font-family="Georgia, 'Times New Roman', serif" font-size="11" text-anchor="%s">%s</text>`,
|
||||
x, baseline+float64(index)*svgchart.FooterLineHeight(11), anchor, html.EscapeString(line))
|
||||
}
|
||||
}
|
||||
Reference in new issue
Block a user