b612
044f2f4381
- 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
83 lines
3.3 KiB
Go
83 lines
3.3 KiB
Go
package geojson
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import (
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"fmt"
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eclipsecore "b612.me/astro/eclipse"
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"b612.me/astro/internal/geodata"
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)
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// MarshalSolarEclipseShadowInstant 单时刻阴影足迹的最小 GeoJSON：只含该时刻的区域与物理边界 / one instant as the smallest useful GeoJSON.
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func (module *Generator) MarshalSolarEclipseShadowInstant(
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instant eclipsecore.SolarEclipseShadowInstant,
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) ([]byte, error) {
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if instant.Empty() {
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return marshalEmptyFeatureCollection()
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}
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curve, err := solarShadowFootprintCurveFromSegments(instant.Boundaries)
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if err != nil {
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return nil, fmt.Errorf("geojson: solar shadow instant at %s: %w", formatTime(instant.Time), err)
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}
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if len(curve) < 2 {
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return marshalEmptyFeatureCollection()
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}
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properties := map[string]interface{}{
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"model": string(instant.Model),
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"delta_t_seconds": instant.DeltaTSeconds,
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"interp_signature": instant.Topology.Signature(),
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}
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regionRole, boundaryRole := solarCentralShadowFootprintRole, solarCentralShadowBoundaryRole
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if instant.Kind == eclipsecore.SolarEclipseShadowPenumbra {
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regionRole, boundaryRole = solarPartialFootprintRole, solarPartialFootprintBoundaryRole
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}
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features := make([]feature, 0, 2)
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regionProperties := cloneProperties(properties)
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regionProperties["time"] = formatTime(instant.Time)
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if instant.Closed {
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// 与整包导出同构：自身闭合的区域不带 geometry_role，也不带 closure。
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regionProperties["source_boundary_closed"] = true
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ring := append([]geodata.GeoPoint(nil), curve...)
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if solarShadowRegionDegenerate(curve, ring) {
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// 首末接触附近区域收缩到零：整条缺省，不退化成线，也不让近零面积的环触发导出错误。
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return marshalEmptyFeatureCollection()
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}
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value, err := multiPolygonGeometry([][]geodata.GeoPoint{ring})
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if err != nil {
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return nil, fmt.Errorf("geojson: solar shadow instant at %s: %w", formatTime(instant.Time), err)
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}
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return marshalFeatureCollection([]feature{
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newFeature(solarEclipseEvent, regionRole, value, regionProperties),
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})
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}
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regionProperties["source_boundary_closed"] = false
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regionProperties["geometry_role"] = "horizon-closed-region"
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regionProperties["closure"] = solarHorizonClosureProperties(
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instant.Time, instant.Time, solarHorizonClosureExact(instant.Boundaries, instant.HorizonEnds), module,
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)
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ring, boundary := solarShadowFootprintHorizonRing(
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instant.Time, instant.Boundaries, instant.HorizonEnds, curve, module,
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)
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if solarShadowRegionDegenerate(curve, ring) {
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return marshalEmptyFeatureCollection()
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}
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value, err := multiPolygonGeometry([][]geodata.GeoPoint{ring})
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if err != nil {
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return nil, fmt.Errorf("geojson: solar shadow instant at %s: %w", formatTime(instant.Time), err)
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}
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features = append(features, newFeature(
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solarEclipseEvent, regionRole, value, regionProperties,
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))
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boundaryValue, err := geoMultiLineGeometry(boundary, false)
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if err != nil {
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return nil, fmt.Errorf("geojson: solar shadow instant at %s: %w", formatTime(instant.Time), err)
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}
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boundaryProperties := cloneProperties(properties)
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boundaryProperties["time"] = formatTime(instant.Time)
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boundaryProperties["source_boundary_closed"] = false
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boundaryProperties["geometry_role"] = "open-boundary"
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features = append(features, newFeature(
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solarEclipseEvent, boundaryRole, boundaryValue, boundaryProperties,
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))
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return marshalFeatureCollection(features)
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}
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