Question

我正在探索Google Maps Direction API并注意到我得到了overview_polyline - ＆gt; points结果。我可以在“编码折线”字段中输入该值：https://developers.google.com/maps/documentation/utilities/polylineutility。结果似乎是从起始位置到结束位置的实际行驶方向。数据看起来对我来说。

我想在Google地图中看到这一点，但是在开始和结束位置之间没有所有地图标记。如何获取此信息并将其绘制在Google地图上？

Answer 1

来自Google Maps Javascript API开发人员指南：Geometry Library: Geometry Encoding

要解码编码路径，只需调用decodePath()将方法传递给编码字符串。

警告，请注意反斜杠编码（替换编码路径字符串中出现的任何＆＃34; \\＆＃34;用＆＃34; \＆＃34;如果您遇到问题）

example fiddle

代码段：

＆＃13;

var map;
var bounds = new google.maps.LatLngBounds();

function initialize() {
  map = new google.maps.Map(
    document.getElementById("map_canvas"), {
      center: new google.maps.LatLng(34, 108),
      zoom: 13,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

  var jsonData = {
    "overview_polyline": {
      "points": "e`miGhmocNaN~DiBiNe@gEkEek@kNez@cJqq@sk@pGos@v]_}@aF_y@qm@qDe~@w]g~@gZ_Jo_@m_@yNsFgUpMov@~QebBrJq`BjTsx@w@kOqbEq_@qkCcf@}}Dej@yzCuf@o{Ba]m~EtVewAnBa`@sNmm@}dDufGqwA_|D_z@g~CmtBkuOrBmtCyG_yCam@{`Ee]qkB}d@ucDmDe|Aha@e}At]{v@xD}e@yf@aeIm^{rEgp@ahBiZu`BkVueH}gDwuXu`Fi__@yZecHgoAgyIl[ybCo^sgD_n@akBaJmeBog@yyAe`@ayB~FifCjNkmAzTwpAgf@cpFy~@{lJsg@ojHyi@e_Fq}@o`Dog@}tBoYmz@y`@sf@qf@ohCkLugBuv@seAg[ul@mMowBqc@iiC}eAcwCqm@_fBmuAypFyIiqA}BwyBy`@ogAwt@ypBezC{dIahBwxJgb@ytCw~AwvJkQwu@{t@yrCg{@s{Fgb@ehDzKsdAxO}vAiRmpCwcAorNuwAgdS_r@imJq[orAk]wrA_TyzAnFefAa\\guB_OmwAwF{tCwMcbDcr@m}_@}Qo_RgMo|A|d@kpAne@u{Brb@wnDzNkuB_D{v@eSgf@w\\ieAyb@guCii@ifCga@i_Amc@m]urAyoD}o@kiIsr@opQuLkhAc_@q`Bq\\}bEeEyi@iE}t@pHi|@tBmlBebB{qHq_BinFoWgpBoDuqEob@k{ConAedC}L}h@yd@yfAgz@}gAaZi_@m}@mcBwyAaj@_bBg|@csBm_Bo|BkaC{iBqsB_YqyBxEmtBks@aoB{RgLa~@bCcr@cLyoAemBeg@gt@_}@e`@on@uu@etA}vCqp@ubAklDgeGmxFiqHaqFoeHa[wbBu]}gAuoDeeG{uAooB_uAsy@om@ugAu_L{xSshEe_KieDm|KcfIcuWeUcOwy@aP{QuUg`BipF{P_l@klAgaEmjEs}NsvAiyFs}@izFjwAqrGtHkbCeB{cEql@g~CgSk|@mB}oAqNekEgw@cmDo_BgjFqqC}gH}`CwvG}cA{cB}nFowQ_t@an@efBmpE_oAsvCka@mwBk_CqbGuu@qfB{uAmrDivDw|E{nAqbDmpCyaJgdCejHk~@owAsw@adAm_@abA}Ven@qCou@cKeiBca@_cBmlAyjAsn@_kCk}@smDkVg{Bk}@gcHox@_sEaPwdC~KazF{EcpCrEmeGl]auBeEi~@yiAovCwwAgsC{i@oSsbAu~Ay_AmaBk_@iKak@mh@_BmBk@wHvG@dBvA"
    }
  };
  var path = google.maps.geometry.encoding.decodePath(jsonData.overview_polyline.points);
  console.log(path);
  for (var i = 0; i < path.length; i++) {
    bounds.extend(path[i]);
  }

  var polyline = new google.maps.Polyline({
    path: path,
    strokeColor: '#FF0000',
    strokeOpacity: 0.8,
    strokeWeight: 2,
    fillColor: '#FF0000',
    fillOpacity: 0.35,
    map: map
      // strokeColor: "#0000FF",
      // strokeOpacity: 1.0,
      // strokeWeight: 2
  });
  polyline.setMap(map);
  map.fitBounds(bounds);

}


google.maps.event.addDomListener(window, "load", initialize);

＆＃13;

html,
body,
#map_canvas {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}

＆＃13;

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script>
<div id="map_canvas" style="border: 2px solid #3872ac;"></div>

＆＃13;

在Google地图中绘制折线

1 个答案: