Question

我正在寻找在Google地图中编辑折线时触发的事件，类似于标记上的“拖动”事件。我发现了'capture_changed'事件，但它似乎是在dragstart和dragend上发生的，而不是在拖拽上。因为我必须通过允许拖动标记并根据标记的位置更新折线来重新发明轮子，基本上重新发明可编辑的折线。我希望能够添加Markers，可编辑的Polylines可以顺利完成，但我必须能够检测拖动。我在API文档或Google搜索中找不到任何内容，所以我想我会在这里问。

Answer 1

修改simple Polyline example from the documentation以在更改上添加事件（insert_at，remove_at，set_at，dragend）。

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Google Maps JavaScript API v3 Example: Polyline Simple</title>
    <link href="/maps/documentation/javascript/examples/default.css" rel="stylesheet">
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
    <script>
var flightPath = null;

      function initialize() {
        var myLatLng = new google.maps.LatLng(0, -180);
        var mapOptions = {
          zoom: 3,
          center: myLatLng,
          mapTypeId: google.maps.MapTypeId.TERRAIN
        };

        var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

        var flightPlanCoordinates = [
            new google.maps.LatLng(37.772323, -122.214897),
            new google.maps.LatLng(21.291982, -157.821856),
            new google.maps.LatLng(-18.142599, 178.431),
            new google.maps.LatLng(-27.46758, 153.027892)
        ];
        flightPath = new google.maps.Polyline({
          path: flightPlanCoordinates,
          strokeColor: '#FF0000',
          strokeOpacity: 1.0,
          strokeWeight: 2,
          editable: true,
          draggable: true
        });
        google.maps.event.addListener(flightPath, "dragend", getPath);
        google.maps.event.addListener(flightPath.getPath(), "insert_at", getPath);
        google.maps.event.addListener(flightPath.getPath(), "remove_at", getPath);
        google.maps.event.addListener(flightPath.getPath(), "set_at", getPath);
        flightPath.setMap(map);
      }

function getPath() {
   var path = flightPath.getPath();
   var len = path.getLength();
   var coordStr = "";
   for (var i=0; i<len; i++) {
     coordStr += path.getAt(i).toUrlValue(6)+"<br>";
   }
   document.getElementById('path').innerHTML = coordStr;
}

    </script>
  </head>
  <body onload="initialize()">
    <div id="map-canvas" style="height:500px; width:600px;"></div>
    <div id="path"></div>
  </body>
</html>

working example

代码段

var flightPath = null;

function initialize() {
  var myLatLng = new google.maps.LatLng(0, -180);
  var mapOptions = {
    zoom: 3,
    center: myLatLng,
    mapTypeId: google.maps.MapTypeId.TERRAIN
  };

  var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  var flightPlanCoordinates = [
    new google.maps.LatLng(37.772323, -122.214897),
    new google.maps.LatLng(21.291982, -157.821856),
    new google.maps.LatLng(-18.142599, 178.431),
    new google.maps.LatLng(-27.46758, 153.027892)
  ];
  flightPath = new google.maps.Polyline({
    path: flightPlanCoordinates,
    strokeColor: '#FF0000',
    strokeOpacity: 1.0,
    strokeWeight: 2,
    editable: true,
    draggable: true
  });
  google.maps.event.addListener(flightPath, "dragend", getPath);
  google.maps.event.addListener(flightPath.getPath(), "insert_at", getPath);
  google.maps.event.addListener(flightPath.getPath(), "remove_at", getPath);
  google.maps.event.addListener(flightPath.getPath(), "set_at", getPath);
  flightPath.setMap(map);
}

function getPath() {
  var path = flightPath.getPath();
  var len = path.getLength();
  var coordStr = "";
  for (var i = 0; i < len; i++) {
    coordStr += path.getAt(i).toUrlValue(6) + "<br>";
  }
  document.getElementById('path').innerHTML = coordStr;
}
google.maps.event.addDomListener(window, 'load', initialize);

<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="path"></div>
<div id="map-canvas" style="height:500px; width:600px;"></div>

用于编辑Google地图折线的事件处理程序？

1 个答案: