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
35 lines
1.6 KiB
Go
35 lines
1.6 KiB
Go
// Package geodata 提供与投影无关的地理拓扑辅助函数，用于 / Package geodata provides projection-neutral geographic topology helpers for
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// 地图渲染器和传输编码器使用 / map renderers and transport encoders.
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package geodata
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// Projection 标识受支持的地图投影 / Projection identifies one of the supported map projections.
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type Projection string
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const (
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ProjectionEquirectangular Projection = "equirectangular"
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ProjectionNorthPolar Projection = "north-polar"
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ProjectionSouthPolar Projection = "south-polar"
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// ProjectionOrthographic 是正射（球面）投影，只画朝向视点的半个地球。
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// ProjectionOrthographic is the orthographic (globe) projection, drawing only the hemisphere facing the view point.
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ProjectionOrthographic Projection = "orthographic"
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)
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// ClipView 是裁剪所依赖的投影及其参数 / ClipView carries the projection and the parameters clipping depends on.
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type ClipView struct {
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Projection Projection
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// Center 是正射投影的视点，也就是可见半球的中心；其他投影忽略它。
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// Center is the orthographic view point, the middle of the visible hemisphere; other projections ignore it.
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Center GeoPoint
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}
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// Orthographic 判断视图是否为正射投影 / Orthographic reports whether the view uses the orthographic projection.
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func (view ClipView) Orthographic() bool {
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return view.Projection == ProjectionOrthographic
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}
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// GeoPoint 是以度表示的地理点，东经为正 / GeoPoint is a geographic point in degrees, with east longitude positive.
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type GeoPoint struct {
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Longitude float64
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Latitude float64
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}
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