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33 lines
886 B
JavaScript
33 lines
886 B
JavaScript
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function transformlat(lonx, laty) {
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/* 略 */
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}
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function transformlng(lonx, laty) {
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/* 略 */
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}
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// WGS-84 转 GCJ-02 坐标
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export function wgs84ToGcj02(lon, lat) {
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const PI = 3.1415926535897932384626
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const a = 6378245.0
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const ee = 0.00669342162296594323
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// if (outOfChina(lon, lat)) {
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// return [lon, lat]
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// }
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let dlat = transformlat(lon - 105.0, lat - 35.0)
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let dlon = transformlng(lon - 105.0, lat - 35.0)
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const radlat = (lat / 180.0) * PI
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let magic = Math.sin(radlat)
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magic = 1 - ee * magic * magic
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const sqrtmagic = Math.sqrt(magic)
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dlat = (dlat * 180.0) / (((a * (1 - ee)) / (magic * sqrtmagic)) * PI)
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dlon = (dlon * 180.0) / ((a / sqrtmagic) * Math.cos(radlat) * PI)
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const mglat = lat + dlat
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const mglon = lon + dlon
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return [mglon, mglat]
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}
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// // 辅助函数保持原样...
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// function outOfChina(lon, lat) {
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// /* 略 */
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// }
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