Google静态地图如何显示两点之间路线3(url过长–路径简化完结篇)

 1 /// <summary>
 2 /// 折线编码转点集合
 3 /// eg     : szmrE}japXrX`zE
 4 /// decode : 34.646343,133.86943　　34.642247,133.834389
 5 /// </summary>
 6 /// <param name="str"></param>
 7 /// <returns></returns>
 8 public static List<GLatLng> DecodePath(string str)
 9 {
10     int b = str.Length;
11     decimal dec = str.Length / 2;
12     //GLatLng[] c = new GLatLng[int.Parse(Math.Floor(dec).ToString())];
13     List<GLatLng> c = new List<GLatLng>();
14 
15     int d = 0, e = 0, f = 0, g = 0;
16 
17     for (; d < b; ++g)
18     {
19         int h = 1, n = 0, q;
20         do
21         {
22             q = str.ToCharArray()[d++] - 63 - 1;
23             h += q << n;
24             n += 5;
25         } while (q >= 31);
26         e += (h & 1) != 0 ? ~(h >> 1) : h >> 1;
27 
28         h = 1;
29         n = 0;
30 
31         do
32         {
33             q = str.ToCharArray()[d++] - 63 - 1;
34             h += q << n;
35             n += 5;
36         } while (q >= 31);
37         f += (h & 1) != 0 ? ~(h >> 1) : h >> 1;
38         //c[g] = new GLatLng(e * 1.0E-5, f * 1.0E-5);
39         c.Add(new GLatLng(e * 1.0E-5, f * 1.0E-5));
40     }
41 
42     //c.Length = g;
43     return c;
44 }

 1 /// <summary>
 2 /// 点集合转折线编码
 3 /// eg    : 34.646343,133.86943|34.642247,133.834389
 4 /// encode: szmrE}japXrX`zE
 5 /// </summary>
 6 /// <param name="points"></param>
 7 /// <returns></returns>
 8 public static string EncodePoints(List<GLatLng> points)
 9 {
10     string _result = "";
11     int plat = 0;
12     int plng = 0;
13 
14     foreach (GLatLng item in points)
15     {
16         int late5 = (int)Math.Floor(item.Lat * 1e5);
17         int lnge5 = (int)Math.Floor(item.Lng * 1e5);
18 
19         int dlat = late5 - plat;
20         int dlng = lnge5 - plng;
21 
22         plat = late5;
23         plng = lnge5;
24 
25         _result += encodeSignedNumber(dlat) + encodeSignedNumber(dlng);
26     }
27 
28     return _result;
29 }
30 
31 private static string encodeSignedNumber(int point)
32 {
33 
34     int _point_int = point << 1;
35 
36     if (point < 0)
37     {
38         _point_int = ~_point_int;
39     }
40     return (encodeNumber(_point_int));
41 }
42 
43 private static string encodeNumber(int num)
44 {
45     string resultString = "";
46 
47     while (num >= 0x20)
48     {
49         int _block = num & 0x1F;
50         _block = (_block | 0x20) + 63;
51         char _result = (char)_block;
52         resultString += _result;
53         num >>= 5;
54     }
55 
56     resultString += (char)(num + 63);
57     return resultString;
58 }