56 lines
1.9 KiB
JavaScript
56 lines
1.9 KiB
JavaScript
export const GetInterval=(min,max,step=10)=>{
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const distance = Math.ceil(max) - Math.floor(min)
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console.log(distance);
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let s = (distance / step);
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console.log(s);
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if (s > 5){
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s = Math.ceil(s / 5) *5;
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return s;
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}else{
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return Math.ceil(s)
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}
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}
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// WGS84 转 GCJ-02
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export function wgs84ToGcj02(lng, lat) {
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if (outOfChina(lng, lat)) {
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return [lng, lat];
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}
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let dlat = transformLat(lng - 105.0, lat - 35.0);
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let dlng = transformLng(lng - 105.0, lat - 35.0);
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const radlat = lat / 180.0 * Math.PI;
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let magic = Math.sin(radlat);
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magic = 1 - 0.00669342162296594323 * magic * magic;
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const sqrtmagic = Math.sqrt(magic);
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dlat = (dlat * 180.0) / ((6378245.0 * (1 - 0.00669342162296594323)) / (magic * sqrtmagic) * Math.PI);
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dlng = (dlng * 180.0) / (6378245.0 / sqrtmagic * Math.cos(radlat) * Math.PI);
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const mglat = lat + dlat;
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const mglng = lng + dlng;
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return [mglng, mglat];
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}
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// 判断是否在中国境内
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function outOfChina(lng, lat) {
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return (lng < 72.004 || lng > 137.8347) || (lat < 0.8293 || lat > 55.8271);
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}
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function transformLat(x, y) {
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let ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
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ret += (20.0 * Math.sin(6.0 * x * Math.PI) + 20.0 * Math.sin(2.0 * x * Math.PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(y * Math.PI) + 40.0 * Math.sin(y / 3.0 * Math.PI)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(y / 12.0 * Math.PI) + 320 * Math.sin(y * Math.PI / 30.0)) * 2.0 / 3.0;
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return ret;
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}
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function transformLng(x, y) {
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let ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
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ret += (20.0 * Math.sin(6.0 * x * Math.PI) + 20.0 * Math.sin(2.0 * x * Math.PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(x * Math.PI) + 40.0 * Math.sin(x / 3.0 * Math.PI)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(x / 12.0 * Math.PI) + 300.0 * Math.sin(x / 30.0 * Math.PI)) * 2.0 / 3.0;
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return ret;
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} |