根据两点经纬度计算距离
2021-06-07 本文已影响0人
溪桥星雨
因为地球是个球形的,所以根据两地的经纬度是可以计算出距离的。原理就不多说了。直接上代码吧。
swift版本:
static func calculateLineDistance(var0:LonLat, var1:LonLat) -> Double {
let DEG_TO_RAD:Double = 0.0174532925199432958
var var2 = Double(var0.lon!);
var var4 = Double(var0.lat!);
var var6 = Double(var1.lon!);
var var8 = Double(var1.lat!);
var2 = DEG_TO_RAD * var2!;
var4 = DEG_TO_RAD * var4!;
var6 = DEG_TO_RAD * var6!;
var8 = DEG_TO_RAD * var8!;
let var10 = sin(var2!);
let var12 = sin(var4!);
let var14 = cos(var2!);
let var16 = cos(var4!);
let var18 = sin(var6!);
let var20 = sin(var8!);
let var22 = cos(var6!);
let var24 = cos(var8!);
var var28 = Array<Double>()
var var29 = Array<Double>()
var28.append(var16 * var14)
var28.append(var16 * var10)
var28.append(var12)
var29.append(var24 * var22)
var29.append(var24 * var18)
var29.append(var20)
return (asin(sqrt((var28[0] - var29[0]) * (var28[0] - var29[0]) + (var28[1] - var29[1]) * (var28[1] - var29[1]) + (var28[2] - var29[2]) * (var28[2] - var29[2])) / 2.0) * 1.27420015798544E7)
}
Dart版本:
static const double DEG_TO_RAD = 0.0174532925199432958;
static double calculateLineDistance(LatLng var0, LatLng var1) {
if(var0 != null && var1 != null){
double var2 = var0.longitude;
double var4 = var0.latitude;
double var6 = var1.longitude;
double var8 = var1.latitude;
var2 *= DEG_TO_RAD;
var4 *= DEG_TO_RAD;
var6 *= DEG_TO_RAD;
var8 *= DEG_TO_RAD;
double var10 = sin(var2);
double var12 = sin(var4);
double var14 = cos(var2);
double var16 =cos(var4);
double var18 = sin(var6);
double var20 = sin(var8);
double var22 = cos(var6);
double var24 = cos(var8);
List<double> var28 = List<double>(3);
List<double> var29 = List<double>(3);
var28[0] = var16 * var14;
var28[1] = var16 * var10;
var28[2] = var12;
var29[0] = var24 * var22;
var29[1] = var24 * var18;
var29[2] = var20;
return (asin(sqrt((var28[0] - var29[0]) * (var28[0] - var29[0]) + (var28[1] - var29[1]) * (var28[1] - var29[1]) + (var28[2] - var29[2]) * (var28[2] - var29[2])) / 2.0) * 1.27420015798544E7);
}else{
return 0.0;
}
}
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