我正在制作一个谷歌地图，用户可以在地图上拥有无限数量的不同类别。我想将每个类别聚集在不同颜色的集群中。
到目前为止，我正在使用谷歌地图symbol 作为单个标记，并且我还想为标记簇创建一个符号。 通过检查标记聚类器 plus 的 reference。我看到它要求提供图片网址 - 有没有办法使用符号代替？
谢谢！
【问题讨论】：
标签： javascript google-maps-api-3 markerclusterer
符号（在 maps-API 的含义中），基本上是由 SVG 路径定义的。
MarkerClusterer 通过<img/> 绘制集群图标。
image-src 也可能是data-URI，因此可以绘制<img/> 这样的符号（SVG 文档）。
简单实现：
function initialize() {
var Symbol=function(id,width,height,fill){
var s={
heart: {
p:'M340.8,83C307,83,276,98.8,256,124.8c-20-26-51-41.8-84.8-41.8C112.1,83,64,131.3,64,190.7c0,27.9,10.6,54.4,29.9,74.6 L245.1,418l10.9,11l10.9-11l148.3-149.8c21-20.3,32.8-47.9,32.8-77.5C448,131.3,399.9,83,340.8,83L340.8,83z',
v:'0 0 512 512'
},
gear: {
p:'M462,280.72v-49.44l-46.414-16.48c-3.903-15.098-9.922-29.343-17.675-42.447l0.063-0.064l21.168-44.473l-34.96-34.96 l-44.471,21.167l-0.064,0.064c-13.104-7.753-27.352-13.772-42.447-17.673L280.72,50h-49.44L214.8,96.415 c-15.096,3.9-29.343,9.919-42.447,17.675l-0.064-0.066l-44.473-21.167l-34.96,34.96l21.167,44.473l0.066,0.064 c-7.755,13.104-13.774,27.352-17.675,42.447L50,231.28v49.44l46.415,16.48c3.9,15.096,9.921,29.343,17.675,42.447l-0.066,0.064 l-21.167,44.471l34.96,34.96l44.473-21.168l0.064-0.063c13.104,7.753,27.352,13.771,42.447,17.675L231.28,462h49.44l16.48-46.414 c15.096-3.903,29.343-9.922,42.447-17.675l0.064,0.063l44.471,21.168l34.96-34.96l-21.168-44.471l-0.063-0.064 c7.753-13.104,13.771-27.352,17.675-42.447L462,280.72z M256,338.4c-45.509,0-82.4-36.892-82.4-82.4c0-45.509,36.891-82.4,82.4-82.4 c45.509,0,82.4,36.891,82.4,82.4C338.4,301.509,301.509,338.4,256,338.4z',
v:'0 0 512 512'
},
vader: {
p:'M 454.5779,419.82295 328.03631,394.69439 282.01503,515.21933 210.30518,407.97233 92.539234,460.65437 117.66778,334.11278 -2.8571457,288.09151 104.38984,216.38165 51.707798,98.615703 178.2494,123.74425 224.27067,3.2193247 295.98052,110.46631 413.74648,57.784277 388.61793,184.32587 509.14286,230.34714 401.89587,302.057 z',
v:'0 0 512 512'
}
}
return ('data:image/svg+xml;base64,'+window.btoa('<svg xmlns="http://www.w3.org/2000/svg" height="'+height+'" viewBox="0 0 512 512" width="'+width+'" ><g><path fill="'+fill+'" d="'+s[id].p+'" /></g></svg>'));
}
var center = new google.maps.LatLng(37.4419, -122.1419);
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 1,
center: center,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var markers = [];
for (var i = 0; i < 500; i++) {
var dataPhoto = data.photos[i];
var latLng = new google.maps.LatLng(dataPhoto.latitude,
dataPhoto.longitude);
var marker = new google.maps.Marker({
position: latLng
});
markers.push(marker);
}
var markerCluster = new MarkerClusterer(map, markers,{styles:[
{width:50,height:50,url:Symbol('heart',50,50,'red')},
{width:75,height:75,url:Symbol('gear',75,75,'green')},
{textColor:'tomato',textSize:'18',width:100,height:100,url:Symbol('vader',100,100,'blue')}
]});
}
google.maps.event.addDomListener(window, 'load', initialize);html,body,#map{height:100%;margin:0;padding:0;}<div id="map"></div>
<script src="http://maps.googleapis.com/maps/api/js?v=3"></script>
<script src="https://cdn.rawgit.com/mahnunchik/markerclustererplus/master/src/data.json"></script>
<script src="https://cdn.rawgit.com/mahnunchik/markerclustererplus/master/dist/markerclusterer.min.js"></script>符号的属性是：
p（路径）v（视图框）注意：window.btoa IE 不支持
【讨论】：
过去我不得不处理这个问题。
为了解决这个问题，我所做的是扩展类 Cluster 以添加一个新的 Google Marker 作为属性。这个标记与集群对象连接在同一位置，是显示符号的标记。
请记住，为避免符号和集群图像重叠，您必须在集群样式中将不透明度设置为 0。
希望它对你有用。
【讨论】：