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- 新增半解析、旧模型、自定义与多源堆叠星历实例，提供 Context、Instance、SPK 读取及状态与视位置计算 - 统一太阳、月球和行星实例接口，扩展黄经穿越、留、相位、最近角距、偕日可见、任意高度升落、轨道节点及凌日等天象查询 - 完善日月食、月掩与凌日的月缘剖面、有限盘面接触、站心修正、局地可见性、全球路径和地图输出 - 新增 SVG、GeoJSON、KML 天象输出及凌日、月掩和月缘地形相关缓存与几何求解 - 新增恒星星表导入与查询，支持 CSV、Hipparcos、BSC5、Stellarium 等格式及名称、交叉标识、锥面检索和星等过滤 - 补充 IAU 2006、地球定向、折射消光、大气观测、轨道传播及半解析行星/月球数据支持 - 将默认未来民用时标切换为 TimeScaleLeapHour，更新 2027–2400 农历速查表、中文日期解析和时区边界处理 - 增加事件基线、跨模型回归、几何边界、月缘地形和输出契约测试，完善中英文手册、示例资源、NOTICE 与忽略规则
99 lines
3.7 KiB
Go
99 lines
3.7 KiB
Go
package occultationgeo
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import (
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"math"
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"time"
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"b612.me/astro/basic"
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"b612.me/astro/internal/geodata"
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)
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const defaultRiseSetProjectedSpacingKM = 35.0
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// DensifyRiseSetCurves 按投影距离插入大地线样本，且不改变端点和分支拓扑。
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// DensifyRiseSetCurves inserts geodesic samples using the projected distance
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// consumed by map renderers. Rise/set solvers intentionally use a coarser time
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// step for performance; using those raw vertices as SVG/GeoJSON linework makes
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// high-latitude curves visibly angular even when the physical path is smooth.
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// Endpoints, phase, direction, and segment topology are preserved exactly.
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func DensifyRiseSetCurves(
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curves []basic.OccultationRiseSetCurve,
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maximumProjectedSpacingKM float64,
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) []basic.OccultationRiseSetCurve {
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if len(curves) == 0 || maximumProjectedSpacingKM <= 0 {
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return curves
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}
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result := make([]basic.OccultationRiseSetCurve, len(curves))
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for curveIndex, curve := range curves {
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result[curveIndex] = basic.OccultationRiseSetCurve{
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Phase: curve.Phase, Direction: curve.Direction,
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Segments: make([][]basic.OccultationPathPoint, len(curve.Segments)),
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}
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for segmentIndex, segment := range curve.Segments {
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result[curveIndex].Segments[segmentIndex] = densifyRiseSetSegment(segment, maximumProjectedSpacingKM)
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}
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}
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return result
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}
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// DensifyOccultationPathPoints 将相同的投影感知间距应用于单条月掩路径。
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// DensifyOccultationPathPoints applies the same projection-aware spacing to a
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// standalone geographic line such as a horizon connector. It keeps both
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// endpoints and does not attach phase metadata to the result.
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func DensifyOccultationPathPoints(
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points []basic.OccultationPathPoint,
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maximumProjectedSpacingKM float64,
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) []basic.OccultationPathPoint {
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return densifyRiseSetSegment(points, maximumProjectedSpacingKM)
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}
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func densifyRiseSetSegment(
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segment []basic.OccultationPathPoint,
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maximumProjectedSpacingKM float64,
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) []basic.OccultationPathPoint {
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if len(segment) < 2 {
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return append([]basic.OccultationPathPoint(nil), segment...)
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}
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result := make([]basic.OccultationPathPoint, 0, len(segment)*2)
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// The interpolation is geodesic on the sphere, while the spacing check is
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// made in Web Mercator. A chord that is exactly at the projected limit can
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// grow slightly after interpolation because Mercator is nonlinear in
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// latitude. Keep a small margin so the emitted linework stays below the
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// requested limit after projection.
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effectiveSpacingKM := maximumProjectedSpacingKM * 0.75
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for index, point := range segment {
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result = append(result, point)
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if index+1 >= len(segment) {
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continue
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}
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next := segment[index+1]
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steps := int(math.Ceil(projectedGeoPointDistanceKM(point, next) / effectiveSpacingKM))
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if steps < 2 {
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continue
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}
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for step := 1; step < steps; step++ {
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fraction := float64(step) / float64(steps)
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middle := interpolateOccultationGeoPoint(
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geodata.GeoPoint{Longitude: point.Longitude, Latitude: point.Latitude},
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geodata.GeoPoint{Longitude: next.Longitude, Latitude: next.Latitude},
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fraction,
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)
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result = append(result, basic.OccultationPathPoint{
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Time: point.Time.Add(time.Duration(float64(next.Time.Sub(point.Time)) * fraction)),
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Longitude: middle.Longitude,
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Latitude: middle.Latitude,
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MoonAltitude: point.MoonAltitude + (next.MoonAltitude-point.MoonAltitude)*fraction,
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WidthKM: point.WidthKM + (next.WidthKM-point.WidthKM)*fraction,
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})
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}
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}
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return result
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}
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func projectedGeoPointDistanceKM(first, second basic.OccultationPathPoint) float64 {
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return geodata.WebMercatorDistanceKM(
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geodata.GeoPoint{Longitude: first.Longitude, Latitude: first.Latitude},
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geodata.GeoPoint{Longitude: second.Longitude, Latitude: second.Latitude},
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)
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}
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