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#pragma once
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#include <vector>
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#include <cmath>
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using namespace std;
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#define PI 3.14159265358979323846
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class GeoCompute
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{
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public:
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GeoCompute(void);
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~GeoCompute(void);
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/*@brief 根据起点坐标、方位角、距离，计算另一点坐标。
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* 使用Vincenty's公式求解,使用WGS-84椭球
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* startPoint:起始点地理坐标点（lat(-90到90)，lon(-180,180)）
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* bearing:方位角（度）
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* dist:两点之间距离(km)
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*/
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void GeoCompute::computeOffsetGeoPosition(double lon1, double lat1, double bearing, double dist,double& targetLon,double& targetLat)
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{
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//角度转化为弧度
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// qreal lon1 = (fmod(startPoint.x()+540,360)-180.0)*PI/180;
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lon1 = lon1*PI/180.0;
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lat1 = lat1*PI/180.0;
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bearing = bearing*PI/180.0;
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dist = dist*1000;
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//WGS-84椭球参数
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double flat = 298.257223563;
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double a = 6378137.0;
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double b = 6356752.314245;
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//开始求解坐标
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double f = 1/flat;
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double sb = sin(bearing);
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double cb = cos(bearing);
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double tu1 = (1-f)*tan(lat1);
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double cu1 = 1/sqrt((1+tu1*tu1));
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double su1 = tu1*cu1;
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double s2 = atan2(tu1, cb);
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double sa = cu1*sb;
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double csa = 1-sa*sa;
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double us = csa*(a*a - b*b)/(b*b);
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double A = 1+us/16384*(4096+us*(-768+us*(320-175*us)));
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double B = us/1024*(256+us*(-128+us*(74-47*us)));
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double s1 = dist/(b*A);
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double s1p = 2*PI;
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double cs1m = 0.0;
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double ss1 = 0.0;
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double cs1 = 0.0;
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double ds1 = 0.0;
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while (abs(s1-s1p) > 1e-12)
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{
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cs1m = cos(2*s2+s1);
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ss1 = sin(s1);
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cs1 = cos(s1);
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ds1 = B*ss1*(cs1m+B/4*(cs1*(-1+2*cs1m*cs1m)- B/6*cs1m*(-3+4*ss1*ss1)*(-3+4*cs1m*cs1m)));
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s1p = s1;
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s1 = dist/(b*A)+ds1;
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}
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double t = su1*ss1-cu1*cs1*cb;
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double lat2 = atan2(su1*cs1+cu1*ss1*cb, (1-f)*sqrt(sa*sa + t*t));
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double l2 = atan2(ss1*sb, cu1*cs1-su1*ss1*cb);
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double c = f/16*csa*(4+f*(4-3*csa));
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double l = l2-(1-c)*f*sa* (s1+c*ss1*(cs1m+c*cs1*(-1+2*cs1m*cs1m)));
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double lon2 = lon1+l;
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targetLon = lon2*180/PI;
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targetLat = lat2*180/PI;
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}
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};
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