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
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 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, solarHorizonClosureExact(instant.Boundaries, instant.HorizonEnds),
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)
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ring, boundary := solarShadowFootprintHorizonRing(
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instant.Time, instant.Boundaries, instant.HorizonEnds, curve,
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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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