google-maps-api-3 - 如何在 Google Maps API 中触发开始多边形绘制？

Question

我想开始使用不同的按钮而不是绘图管理器控件在 map 上绘制多边形。

是否可以触发一个行为类似于按下绘图管理器多边形控件的事件？

Answer 1

要使用不同的控件开始绘制多边形:

1. 删除现有的绘图控件:

drawingControl: false,

添加您自己的按钮:

<input id="polygonbtn" type="button" value="Draw Polygon"/>

设置点击时的绘图模式:

google.maps.event.addDomListener(document.getElementById('polygonbtn'), 'click', function() {
  drawingManager.setDrawingMode(google.maps.drawing.OverlayType.POLYGON);
});

proof of concept fiddle

代码片段:

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    center: {
      lat: -34.397,
      lng: 150.644
    },
    zoom: 8
  });

  var drawingManager = new google.maps.drawing.DrawingManager({
    drawingControl: false,
  });
  drawingManager.setMap(map);
  google.maps.event.addDomListener(document.getElementById('polygonbtn'), 'click', function() {
    drawingManager.setDrawingMode(google.maps.drawing.OverlayType.POLYGON);
  });
  google.maps.event.addDomListener(document.getElementById('cancelbtn'), 'click', function() {
    drawingManager.setDrawingMode(null);
  });
}

/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */

#map {
  height: 100%;
}


/* Optional: Makes the sample page fill the window. */

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

<input id="polygonbtn" type="button" value="Draw Polygon" />
<input id="cancelbtn" type="button" value="Cancel" />
<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script src="https://maps.googleapis.com/maps/api/js?libraries=drawing&callback=initMap&key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk" async defer></script>