maptalks - UI collision

UI collision

index.html

<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Control and UIComponents - UI collision</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
    .text_marker{font:15px bold sans-serif;color:#0000;text-shadow:2px 0 white;background-color:#2695bbb3;border:2px solid #43fff3;width:120px;height:40px;text-align:center}
  </style>
  <link rel="stylesheet" href="https://unpkg.com/maptalks/dist/maptalks.css">
  <script type="text/javascript" src="https://unpkg.com/maptalks/dist/maptalks.min.js"></script>
  <body>
    <script src="./capitals.js"></script>
    <div id="map" class="container"></div>
    <script>
      var capitals = window.capitals;
      var baseLayer = new maptalks.TileLayer('base', {
        urlTemplate: 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
        subdomains: ["a","b","c","d"],
        attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
      });
      var map = new maptalks.Map('map', {
        center: [100.63299495279648, 30.895363667711848],
        zoom: 3,
        pitch: 0,
        attribution: true,
        zoomControl: true,
        baseLayer: baseLayer
      });

      var layer = new maptalks.VectorLayer('layer').addTo(map);

      function createMarkerContent(name) {
        var div = document.createElement('div');
        div.className = 'text_marker';
        div.innerHTML = name;
        return div;
      }

      function addMarkers() {
        //test UIMarker
        var uiMarkers = capitals.map(function (f, index) {
          var lnglat = f.center;
          return new maptalks.ui.UIMarker(lnglat, {
            collision: true,
            collisionBufferSize: 2,
            collisionWeight: 1,
            collisionFadeIn: true,
            content: createMarkerContent(f.name + '_' + index),
            verticalAlignment: 'top',
            dy: -6
          });
        });
        //test InfoWindow
        var markers = capitals.map(function (f) {
          var lnglat = f.center;
          var marker = new maptalks.Marker(lnglat, {
            symbol: {
              markerType: 'ellipse',
              markerWidth: 10,
              markerHeight: 10,
              markerFill: 'red'
            }
          });
          marker.setInfoWindow({
            collision: true,
            collisionBufferSize: 2,
            collisionWeight: 2,
            collisionFadeIn: true,
            content: f.name
          });
          return marker;
        });

        uiMarkers.forEach(function (marker) {
          marker.addTo(map);
        });

        layer.addGeometry(markers);
        markers.slice(0, 1).forEach(function (marker) {
          marker.openInfoWindow();
        });
      }
      addMarkers();

    </script>
  </body>
</html>

var layer = new maptalks.VectorLayer('layer').addTo(map);

function createMarkerContent(name) {
  var div = document.createElement('div');
  div.className = 'text_marker';
  div.innerHTML = name;
  return div;
}

uiMarkers.forEach(function(marker) {
    marker.addTo(map);
  });

layer.addGeometry(markers);
  markers.slice(0, 1).forEach(function(marker) {
    marker.openInfoWindow();
  });
}
addMarkers();