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How to achieve point diffusion using openlayers4?

亚连Original: 2018-06-11 10:18:261777browse

This article mainly introduces the diffusion effect of implementation points based on openlayers4 in detail. It has certain reference value. Interested friends can refer to it.

The examples in this article share the implementation points of openlayers4 with everyone. The diffusion effect is for your reference. The specific content is as follows

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <title>Title</title> 
  <link rel="stylesheet" href="https://openlayers.org/en/v4.6.4/css/ol.css" rel="external nofollow" type="text/css">  
  <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->  
  <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>  
  <script src="https://openlayers.org/en/v4.6.4/build/ol.js"></script> 
  <style> 
    .css_animation{ 
      height:100px; 
      width:100px; 
      border-radius: 50%; 
      background: rgba(255, 0, 0, 0.9); 
      transform: scale(0); 
      animation: myfirst 3s; 
      animation-iteration-count: infinite; 
    } 
    @keyframes myfirst{ 
      to{ 
        transform: scale(2); 
        background: rgba(0, 0, 0, 0); 
      } 
    } 
 
  </style> 
</head> 
<body> 
  <p id="map" style="width: 100%;height: 100%"></p> 
  <script> 
    var map = new ol.Map({ 
      layers:[new ol.layer.Tile({ 
        source:new ol.source.OSM() 
      })], 
      target:&#39;map&#39;, 
      view:new ol.View({ 
        center: [12950000, 4860000], 
        zoom:7 
      }) 
    }); 
 
    var point_p = document.createElement(&#39;p&#39;); 
    point_p.className = &#39;css_animation&#39;; 
    point_overlay = new ol.Overlay({ 
      element:point_p, 
      positioning:&#39;center-center&#39; 
    }); 
    map.addOverlay(point_overlay); 
 
    point_overlay.setPosition([12950000, 4860000]); 
  </script> 
</body> 
</html>

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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