wehub-resource-sync
72 lines
2.1 KiB
TypeScript
72 lines
2.1 KiB
TypeScript
/**
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* Compass App 常量/纯计算工具
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*
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* 说明：
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* - 这些函数不依赖运行时环境，属于“常量层/工具层”，不应与默认数据混在一起。
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*/
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export interface DirectionLabels {
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north: string;
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northeast: string;
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east: string;
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southeast: string;
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south: string;
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southwest: string;
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west: string;
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northwest: string;
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}
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const DEFAULT_DIRECTION_LABELS: DirectionLabels = {
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north: '北',
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northeast: '东北',
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east: '东',
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southeast: '东南',
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south: '南',
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southwest: '西南',
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west: '西',
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northwest: '西北',
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};
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/** 根据朝向角度计算方向文字 */
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export function getDirectionText(deg: number, labels: DirectionLabels = DEFAULT_DIRECTION_LABELS): string {
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// 归一化到 [0, 360)
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const normalized = ((deg % 360) + 360) % 360;
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if (normalized >= 337.5 || normalized < 22.5) return labels.north;
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if (normalized < 67.5) return labels.northeast;
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if (normalized < 112.5) return labels.east;
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if (normalized < 157.5) return labels.southeast;
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if (normalized < 202.5) return labels.south;
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if (normalized < 247.5) return labels.southwest;
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if (normalized < 292.5) return labels.west;
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return labels.northwest;
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}
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/** 将十进制度数格式化为度分秒 (DMS) 显示 */
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export function formatDMS(decimal: number): string {
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const abs = Math.abs(decimal);
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const degrees = Math.floor(abs);
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const minutesFloat = (abs - degrees) * 60;
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const minutes = Math.floor(minutesFloat);
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const seconds = Math.round((minutesFloat - minutes) * 60);
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return `${degrees}°${minutes}'${seconds}"`;
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}
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/** 根据经纬度计算显示标签和值 */
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export function formatLatLon(
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latitude: number,
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longitude: number,
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labels?: { latNorth: string; latSouth: string; lonEast: string; lonWest: string },
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) {
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const latNorth = labels?.latNorth ?? '北纬';
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const latSouth = labels?.latSouth ?? '南纬';
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const lonEast = labels?.lonEast ?? '东经';
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const lonWest = labels?.lonWest ?? '西经';
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return {
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latLabel: latitude >= 0 ? latNorth : latSouth,
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latValue: formatDMS(latitude),
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lonLabel: longitude >= 0 ? lonEast : lonWest,
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lonValue: formatDMS(longitude),
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};
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}
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