Google Maps API：使用多段线的点绘制路线

Question

我使用谷歌方向获取两点之间的主要路线，它是替代方案（3），因此每个替代方案都包含步骤以及所有步骤的概观折线结果所以我想在地图中绘制这3条多段线来查看主要路线和替代方案，你知道该怎么做吗？

这是概述折线

"overview_polyline": { 
    "points": "uiyqBfb~zQgGwAgCtM}DfVpDrBeBbFqDjFmHfXkOzh@cKxNuGlW_BzSiJxZcBfHuS~NqK`Ia@lFgIpC{fAoDcW~BmEbBeqAmIaEoBgB{KB}J}OoJcBwAeHuAwDaBkCnCwKjLcNgBkIc@oDtD}EhG{GjAgVcDsN{Bm@|FaAvOiE|Va`@xw@}Jh]dPhcArEzQuIpXkMna@sDbPb@fGdDxE|O~E~ZzH`ThQtdA|jA|NfRxC~Jc@p[iEd`@WbSvKza@rTlf@~ArMfFtJrChOjQfM~JzX@~VnOn]g@jMcBdLkGzHg@|DyGfEcEjLgEvHaKoAgNiEoLsCoKUkUz@_CtBqI?eDhAeGeDsIRyK`IqIfIkPtEuUbNcLpOuPpZ]rHpHtQpLnOlEvIEpJfId[pShc@z@th@cLx@yNnGk`@rVsLfLm|@v|@_VxKgZ`XmR~VeH~^~@jIsAvLeD~LiCre@mGhP}Eda@D`YqBt[aIna@iI|Db@pENpDtAzCc@pG{@bFuQlGcLxGuUz@}PhBUhIcD`Eof@rMwUfEk^|Ck}@tFcMjDiP~GeN`RcF]}CxBmEc@{BvAoGdCsKpFmOgEuB\\eEjKjB~GwGvBiDsDgEyGwD`JeDTgCyGuCOcGvFmGzJeC_DwCa@WvM{@rC_CJuHoIiFEgBwC{HeJuCm@sAxAf@fFoBvBmDx@iNm@mCxD{DkAwMrDcJrF}IhSsDbB{D{AyY_CoK~AuP`@uPm@eKbC}Lq@eNsCeDeC_Jj@wIb@mEr@eHgBiGoKiGyJeDgI}CmHG{KiCyO}P}IgNkNaUoKkCkDYiB{Bg@sFwAaDeDsSwT}PY{KaEeIBqTfEiEeEgDkLyUyIkT}BoP{DyGiGwHiW{Is^kOiScLmTeIqGsPcTqD_FgMaDwNqMwOuVqHy\\yFkMmGwEaHeAqBmCr@aU_CiBoSpDyHBkH}Kc[kTq[mPyYiOyVyR_Sc\\{ZsRwfA{]wh@oPaNVyIiFeHKmE~AqAhEwNgDiNmFgL~H}Cs@oIxH{DRsFqG_FoA}GfEgP~MuFi@}Sh@yDdDgInBaGh@w[cCwH~AeGeFeLcUD_LkAiDwUaJuMXaQuGyBgB|LkLhL{JnPoGhIuQfACz@kEqCgBF}F~@qL{AaHa@qJCcHiAsBeH]{PiHeJoCu@{BxCwC[cFiVePaGt@}KoH_NyMyNiGyWwMeIgFiLmIod@lEoSaf@eIrF{@oG}C_@{B{CsEmAmDgCcAoL_AaFs@oCl@mD\\eMkHkFaJqFkEiPN}HrBvKdEzExA|FJJ" 
    }, 

Answer 1

使用geometry library的decodePath功能的编码点进行解码用作Polyline的路径。

var polyline = new google.maps.Polyline({ 
    path: google.maps.geometry.encoding.decodePath(json.overview_polyline.points), 
    map: map 
    }); 

proof of concept fiddle

代码片断：

var json = { 
 
    "overview_polyline": { 
 
    "points": "uiyqBfb~zQgGwAgCtM}DfVpDrBeBbFqDjFmHfXkOzh@cKxNuGlW_BzSiJxZcBfHuS~NqK`Ia@lFgIpC{fAoDcW~BmEbBeqAmIaEoBgB{KB}J}OoJcBwAeHuAwDaBkCnCwKjLcNgBkIc@oDtD}EhG{GjAgVcDsN{Bm@|FaAvOiE|Va`@xw@}Jh]dPhcArEzQuIpXkMna@sDbPb@fGdDxE|O~E~ZzH`ThQtdA|jA|NfRxC~Jc@p[iEd`@WbSvKza@rTlf@~ArMfFtJrChOjQfM~JzX@~VnOn]g@jMcBdLkGzHg@|DyGfEcEjLgEvHaKoAgNiEoLsCoKUkUz@_CtBqI?eDhAeGeDsIRyK`IqIfIkPtEuUbNcLpOuPpZ]rHpHtQpLnOlEvIEpJfId[pShc@z@th@cLx@yNnGk`@rVsLfLm|@v|@_VxKgZ`XmR~VeH~^~@jIsAvLeD~LiCre@mGhP}Eda@D`YqBt[aIna@iI|Db@pENpDtAzCc@pG{@bFuQlGcLxGuUz@}PhBUhIcD`Eof@rMwUfEk^|Ck}@tFcMjDiP~GeN`RcF]}CxBmEc@{BvAoGdCsKpFmOgEuB\\eEjKjB~GwGvBiDsDgEyGwD`JeDTgCyGuCOcGvFmGzJeC_DwCa@WvM{@rC_CJuHoIiFEgBwC{HeJuCm@sAxAf@fFoBvBmDx@iNm@mCxD{DkAwMrDcJrF}IhSsDbB{D{AyY_CoK~AuP`@uPm@eKbC}Lq@eNsCeDeC_Jj@wIb@mEr@eHgBiGoKiGyJeDgI}CmHG{KiCyO}P}IgNkNaUoKkCkDYiB{Bg@sFwAaDeDsSwT}PY{KaEeIBqTfEiEeEgDkLyUyIkT}BoP{DyGiGwHiW{Is^kOiScLmTeIqGsPcTqD_FgMaDwNqMwOuVqHy\\yFkMmGwEaHeAqBmCr@aU_CiBoSpDyHBkH}Kc[kTq[mPyYiOyVyR_Sc\\{ZsRwfA{]wh@oPaNVyIiFeHKmE~AqAhEwNgDiNmFgL~H}Cs@oIxH{DRsFqG_FoA}GfEgP~MuFi@}Sh@yDdDgInBaGh@w[cCwH~AeGeFeLcUD_LkAiDwUaJuMXaQuGyBgB|LkLhL{JnPoGhIuQfACz@kEqCgBF}F~@qL{AaHa@qJCcHiAsBeH]{PiHeJoCu@{BxCwC[cFiVePaGt@}KoH_NyMyNiGyWwMeIgFiLmIod@lEoSaf@eIrF{@oG}C_@{B{CsEmAmDgCcAoL_AaFs@oCl@mD\\eMkHkFaJqFkEiPN}HrBvKdEzExA|FJJ" 
 
    } 
 
}; 
 

 
function initialize() { 
 
    var map = new google.maps.Map(
 
    document.getElementById("map_canvas"), { 
 
     center: new google.maps.LatLng(37.4419, -122.1419), 
 
     zoom: 13, 
 
     mapTypeId: google.maps.MapTypeId.ROADMAP 
 
    }); 
 
    var polyline = new google.maps.Polyline({ 
 
    path: google.maps.geometry.encoding.decodePath(json.overview_polyline.points), 
 
    map: map 
 
    }); 
 
    var bounds = new google.maps.LatLngBounds(); 
 
    for (var i = 0; i < polyline.getPath().getLength(); i++) { 
 
    bounds.extend(polyline.getPath().getAt(i)); 
 
    } 
 
    map.fitBounds(bounds); 
 
} 
 
google.maps.event.addDomListener(window, "load", initialize);

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

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry"></script> 
 
<div id="map_canvas"></div>

Answer 2

应声明你的路径，然后宣布这样的折线之一：

var flightPlanCoordinates = [ 
    {lat: 37.772, lng: -122.214}, 
    {lat: 21.291, lng: -157.821}, 
    {lat: -18.142, lng: 178.431}, 
    {lat: -27.467, lng: 153.027} 
    ]; 
    var flightPath = new google.maps.Polyline({ 
    path: flightPlanCoordinates, 
    geodesic: true, 
    strokeColor: '#FF0000', 
    strokeOpacity: 1.0, 
    strokeWeight: 2 
    });