如何在 Google 地图 api3 中用一条线连接两个标记

Question

我制作了一个 html 文件，该文件从 XML 文件中获取数据并使用其中的数据在地图上绘制两个标记有什么方法可以连接这两个标记没有固定位置这是我的标记代码。

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Simple markers</title>
    <style>
      html, body, #map-canvas {
        height: 100%;
        margin: 0px;
        padding: 0px
      }
    </style>
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>
    <script>
var map;
window.onload=function ()
{
    var myLatlng = new google.maps.LatLng(0,0);
    var mapOptions = {
        zoom: 4,
        center: myLatlng
    }
    map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
    //google.maps.event.addDomListener(window, 'load', mapready);
    getdata();
    setInterval(function () {getdata()}, 1000);
}

function getdata() 
{
    if (window.XMLHttpRequest)
      {// code for IE7+, Firefox, Chrome, Opera, Safari
      xmlhttp=new XMLHttpRequest();
      }
    else
      {// code for IE6, IE5
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
   xmlhttp.open("GET","xxxxxxxxxxx",true);
   xmlhttp.onreadystatechange=function () {gotdata()};
   xmlhttp.send();
}
var lastCoordinates={};
var polyline = new google.maps.Polyline({map:map})
var path = [];
function gotdata(){

    if (xmlhttp.readyState == 4){

        var d = xmlhttp.responseXML.documentElement 
            //innerHTML shouldn't work for XML-Nodes
            y = d.getElementsByTagName("y")[0].textContent,
            x = d.getElementsByTagName("x")[0].textContent,
            h = [x,y].join('_');
        if(lastCoordinates[h]){
          return;
        } 

        lastCoordinates[h]= new google.maps.Marker({
                              position: new google.maps.LatLng(x,y),
                              map: map,
                              title: 'YAY'
                            });
         path.push(lastcoordinates[h].getPosition());
         if (path.length >= 2) {
           polyline.setPath(path);
         }

    }
}

这是我的 XML 文件中的内容

<Location>
<x>42</x>
<y>14</y>
</Location>

它从中获取 x 和 y 数据，当我更改它时，地图会创建另一个文件。

Answer 1

为可用选项创建一个 polyline (See the documentation）

 var polyline = new google.maps.Polyline({
    // set desired options for color, opacity, width, etc.
    strokeColor:"#0000FF",  // blue (RRGGBB, R=red, G=green, B=blue)
    strokeOpacity: 0.4      // opacity of line
 }); // create the polyline (global)
 var path = []; // global variable to hold all the past locations

用你的积分更新它

 function gotdata(){

     if (xmlhttp.readyState == 4){

         var d = xmlhttp.responseXML.documentElement 
             //innerHTML shouldn't work for XML-Nodes
             y = d.getElementsByTagName("y")[0].textContent,
             x = d.getElementsByTagName("x")[0].textContent,
             h = [x,y].join('_');
         if(lastCoordinates[h]){
           return;
         } 

         lastCoordinates[h]= new google.maps.Marker({
                               position: new google.maps.LatLng(x,y),
                               map: map,
                               title: 'YAY'
                             });
          path.push(lastCoordinates[h].getPosition());
          if (path.length >= 2) {
            // display the polyline once it has more than one point
            polyline.setMap(map);
            polyline.setPath(path);
          }

     }
 }

proof of concept fiddle

代码片段：

var geocoder;
var map;
var lastCoordinates = [];
var count = 0;
var polyline = new google.maps.Polyline({
   // set desired options for color width
   strokeColor:"#0000FF",  // blue (RRGGBB, R=red, G=green, B=blue)
   strokeOpacity: 0.4      // opacity of line
}); // create the polyline (global)
var path = []; // global variable to hold all the past locations

function initialize() {
    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
    });
    setInterval(gotdata, 1000);

}
google.maps.event.addDomListener(window, "load", initialize);

function gotdata() {

    // if (xmlhttp.readyState == 4){
    count++;
    // var d = xmlhttp.responseXML.documentElement 
    //innerHTML shouldn't work for XML-Nodes
    y = count * 0.01; // d.getElementsByTagName("y")[0].textContent,
    x = count * 0.01; //d.getElementsByTagName("x")[0].textContent,
    h = [x, y].join('_');
    if (lastCoordinates[h]) {
        return;
    }

    lastCoordinates[h] = new google.maps.Marker({
        position: new google.maps.LatLng(x, y),
        map: map,
        title: 'YAY'
    });
    map.panTo(lastCoordinates[h].getPosition());
    path.push(lastCoordinates[h].getPosition());
    if (path.length >= 2) {
        // display the polyline once it has more than one point
        polyline.setMap(map);
        polyline.setPath(path);
    }
    // }
}

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

<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry,places&key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<div id="map_canvas" style="border: 2px solid #3872ac;"></div>

如何在 Google 地图 api3 中用一条线连接两个标记

How to connect two markers with a line in Google maps api3

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