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ccf5880269
- 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
71 lines
3.7 KiB
Go
71 lines
3.7 KiB
Go
// Package svg 生成日食、月食与水星、金星凌日的 SVG 图件。
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//
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// 可降级的图层用 data-source 标注实际几何来源，取值词表如下；没有降级分支的图层不带该属性。
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//
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// partial-band-union 偏食可见域填充：权威边界线材与瞬时足迹求并集
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// sampled-footprint-sweep 偏食可见域填充：逐瞬时足迹扫掠（并集不可用时的降级）
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// partial-band-contours 偏食可见域边界线
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// rise-set-phase-lines 初亏、食甚、复圆的日升日落线
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// magnitude-contours 地方最大食分等值线
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// greatest-time-isochrones 食甚时刻等时线
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// besselian-critical-envelope 中心食带：Bessel 临界包络
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// paired-limit-chords 中心食带：南北限界弦带（包络不可用时的降级）
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// sampled-open-sweep 中心食带：采样扫掠（前两者都不可用时的降级）
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// central-path-limits 中心线与南北限界线
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// penumbral-outlines 瞬时半影轮廓
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// central-shadow-outlines 瞬时本影、反本影轮廓
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// p1-p4-visibility-regions 月食可见性分区
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// p1-p4-horizon-boundaries 月食 P1、P4 地平边界
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// c1-c4-visibility-regions 凌日可见性分区
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// c1-c4-horizon-boundaries 凌日 C1、C4 视地平边界
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// transit-contact-isochrones 凌日站心接触等时线
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// topocentric-transit-visibility 地心无接触时按站心求得的部分凌日可见区
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//
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// Package svg renders solar-eclipse, lunar-eclipse and Mercury/Venus transit SVG charts. Degradable layers tag the geometry
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// source they actually used in data-source, using exactly the values above.
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package svg
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// data-source 词表，见包注释。
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const (
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eclipseMapSourcePartialBandUnion = "partial-band-union"
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eclipseMapSourceSampledFootprintSweep = "sampled-footprint-sweep"
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eclipseMapSourcePartialBandContours = "partial-band-contours"
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eclipseMapSourceRiseSetPhaseLines = "rise-set-phase-lines"
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eclipseMapSourceMagnitudeContours = "magnitude-contours"
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eclipseMapSourceGreatestTimeIsochrones = "greatest-time-isochrones"
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eclipseMapSourceBesselianEnvelope = "besselian-critical-envelope"
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eclipseMapSourcePairedLimitChords = "paired-limit-chords"
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eclipseMapSourceSampledOpenSweep = "sampled-open-sweep"
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eclipseMapSourceCentralPathLimits = "central-path-limits"
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eclipseMapSourcePenumbralOutlines = "penumbral-outlines"
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eclipseMapSourceCentralShadowOutlines = "central-shadow-outlines"
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eclipseMapSourceLunarVisibilityRegions = "p1-p4-visibility-regions"
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eclipseMapSourceLunarHorizonBoundaries = "p1-p4-horizon-boundaries"
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eclipseMapSourceTransitVisibilityRegions = "c1-c4-visibility-regions"
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eclipseMapSourceTransitHorizonBoundaries = "c1-c4-horizon-boundaries"
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eclipseMapSourceTransitContactIsochrones = "transit-contact-isochrones"
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eclipseMapSourceTransitPartialVisibility = "topocentric-transit-visibility"
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)
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// eclipseMapDataSources 是全部合法取值，测试用它封闭词表。
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var eclipseMapDataSources = []string{
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eclipseMapSourcePartialBandUnion,
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eclipseMapSourceSampledFootprintSweep,
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eclipseMapSourcePartialBandContours,
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eclipseMapSourceRiseSetPhaseLines,
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eclipseMapSourceMagnitudeContours,
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eclipseMapSourceGreatestTimeIsochrones,
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eclipseMapSourceBesselianEnvelope,
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eclipseMapSourcePairedLimitChords,
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eclipseMapSourceSampledOpenSweep,
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eclipseMapSourceCentralPathLimits,
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eclipseMapSourcePenumbralOutlines,
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eclipseMapSourceCentralShadowOutlines,
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eclipseMapSourceLunarVisibilityRegions,
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eclipseMapSourceLunarHorizonBoundaries,
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eclipseMapSourceTransitVisibilityRegions,
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eclipseMapSourceTransitHorizonBoundaries,
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eclipseMapSourceTransitContactIsochrones,
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eclipseMapSourceTransitPartialVisibility,
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}
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