66 lines
2.1 KiB
JavaScript
66 lines
2.1 KiB
JavaScript
|
import geomagnetism from 'geomagnetism';
|
|||
|
|
|
|||
|
|
export function useGeomagnetism() {
|
|||
|
|
const bd09toWgs84 = (bd_lat, bd_lng) => {
|
|||
|
|
const x_pi = (3.14159265358979324 * 3000.0) / 180.0;
|
|||
|
|
const x = Number(bd_lng) - 0.0065;
|
|||
|
|
const y = Number(bd_lat) - 0.006;
|
|||
|
|
const z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
|
|||
|
|
const theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
|
|||
|
|
return {
|
|||
|
|
lat: z * Math.sin(theta) - 0.002,
|
|||
|
|
lng: z * Math.cos(theta) - 0.005
|
|||
|
|
};
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
const calculate = (latitude, longitude, altitude = 0) => {
|
|||
|
|
try {
|
|||
|
|
// 强制转换
|
|||
|
|
const numLat = parseFloat(latitude);
|
|||
|
|
const numLng = parseFloat(longitude);
|
|||
|
|
|
|||
|
|
if (isNaN(numLat) || isNaN(numLng)) {
|
|||
|
|
console.warn('磁偏角计算: 无效的经纬度', { latitude, longitude });
|
|||
|
|
return { declination: 0, success: false };
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
const wgs = bd09toWgs84(numLat, numLng);
|
|||
|
|
|
|||
|
|
// 获取地磁模型 - geomagnetism.model(date) 返回模型实例
|
|||
|
|
const model = geomagnetism.model(new Date());
|
|||
|
|
|
|||
|
|
if (!model || typeof model.point !== 'function') {
|
|||
|
|
console.error("无法加载地磁模型或模型没有point方法");
|
|||
|
|
return { declination: 0, success: false };
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// point() 方法接受数组参数 [lat, lon, altitude]
|
|||
|
|
// 根据库源码，参数顺序是 [lat, lon, altitude]
|
|||
|
|
const info = model.point([wgs.lat, wgs.lng, altitude]);
|
|||
|
|
|
|||
|
|
if (!info) {
|
|||
|
|
console.error('model.point() 返回 null 或 undefined');
|
|||
|
|
return { declination: 0, success: false };
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 根据 geomagnetism 库的类型定义，返回值属性名是 decl（不是 declination）
|
|||
|
|
const decl = info.decl;
|
|||
|
|
|
|||
|
|
if (typeof decl !== 'number' || isNaN(decl)) {
|
|||
|
|
console.warn('磁偏角值无效:', decl, 'info对象:', info);
|
|||
|
|
return { declination: 0, success: false };
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return {
|
|||
|
|
declination: decl,
|
|||
|
|
success: true
|
|||
|
|
};
|
|||
|
|
} catch (e) {
|
|||
|
|
console.error('磁偏角计算过程出错:', e);
|
|||
|
|
console.error('错误堆栈:', e.stack);
|
|||
|
|
return { declination: 0, success: false };
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
return { calculate };
|
|||
|
|
}
|