Baidu Map API calculates distances based on two coordinate points

Baidu maps Android SDK API inside, there is no immediate way to get the distance between two coordinate points, but, in the JSAPI, there is a direct way to calculate the distance.

class Point:pass def max (A, b):ifA>B:returnareturnb def min (a,c):ifA>C:returnCreturna def LW (A, B, c): # b! = N && (a =Math.max (A, b)); # c! = N && (a =Math.min (A, c)); A=Max (A, b) a=min (a,c)returna def ew (A, B, c): whileA >c:a-= C-b whileA <b:a+ = C-breturnA def oi (a):returnMath.PI * a/180def Td (A, B, C, D):return6370996.81 * Math.acos (Math.sin (c) * Math.sin (d) + Math.Cos (c) * Math.Cos (d) * Math.Cos (B-a) def Wv (A, b):ifNot A or not B:return0; A.LNG= EW (A.LNG,-180, 180); A.lat= LW (A.lat,-74, 74); B.LNG= EW (B.LNG,-180, 180); B.lat= LW (B.lat,-74, 74); returnTd (Oi (a.lng), Oi (b.lng), Oi (A.lat), Oi (B.lat)) def getdistance (A, B): C=Wv (A, b); returnC

So, based on the above method, we have implemented the method of calculating distances in the Java language as follows:

     Public Static DoubleGetdistance (DoubleLat_a,DoubleLng_a,DoubleLat_b,DoubleLng_b) {        DoublePK = 180/3.14169; DoubleA1 = lat_a/PK; DoubleA2 = lng_a/PK; DoubleB1 = lat_b/PK; DoubleB2 = Lng_b/PK; DoubleT1 = Math.Cos (A1) * MATH.COS (A2) * MATH.COS (B1) *Math.Cos (B2); DoubleT2 = Math.Cos (A1) * Math.sin (A2) * MATH.COS (B1) *Math.sin (B2); DoubleT3 = Math.sin (A1) *Math.sin (B1); Doublett = math.acos (t1 + t2 +T3); return6371000 *tt; }

Reference:

http://blog.csdn.net/mad1989/article/details/9933089

http://blog.csdn.net/pleasurelong/article/details/26855049

Baidu Map API calculates distances based on two coordinate points