Openlayers实现点闪烁扩散效果

时间:2020-09-24 gw依旧爱学习人气:0

本文着重为大家仔细讲解了Openlayers实现点闪烁扩散效果，文中代码实例讲解的非常细致，希望能够帮助到您，欢迎大家阅读和收藏

点闪烁样式：

DOM的样式实现

/**橙色点扩散闪烁样式*/
.point_animation{
 background: #ff9900;
 width: 6px;
 height: 6px;
 border: 2px #ff9900 solid;
 border-radius: 50%;
 position: absolute;
}
.point_animation p, .point_animation span{
 position: absolute;
 width: 4px;
 height: 4px;
 animation: point_animation 1.5s infinite;
 box-shadow: 0px 0px 1px #ff9900; 
 margin: 0px;
 border-radius: 50%;
}
.point_animation span{
 animation-delay: 0.8s;
}
@keyframes point_animation{
 10% {
 transform: scale(1);
 }
 100% {
 transform: scale(8);
 }
}
/**红色点扩散闪烁样式*/
.css_animation{
 height:50px; 
 width:50px;
 border-radius: 25px; 
 background: rgba(255, 0, 0, 0.9);
 transform: scale(0);
 animation: mypoint 3s;  
 animation-iteration-count: infinite;
}
@keyframes mypoint{
 to{
 transform: scale(1.5);
 background: rgba(0, 0, 0, 0);
 }
}

在地图上添加点—采用overlay添加DOM元素

需要用到Openlayers中的overlay元素，官方对于如何使用overlay做出了相关API说明

///创建overlay，element传入的是存在于web中的DOM元素
var popup = new ol.Overlay({
 element: document.getElementById('popup')
});
popup.setPosition(coordinate);//设置overlay的位置
map.addOverlay(popup);//讲overlay添加到地图上

具体代码

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>点扩散</title>
 <link rel="stylesheet" href="https://openlayers.org/en/v3.20.1/css/ol.css" type="text/css">
  <script src="https://openlayers.org/en/v3.20.1/build/ol.js"></script>
 <style>
 .point_animation{
  background: #ff9900;
  width: 6px;
  height: 6px;
  border: 2px #ff9900 solid;
  border-radius: 50%;
  position: absolute;
 }

 .point_animation p, .point_animation span{
  position: absolute;
  width: 4px;
  height: 4px;
  animation: point_animation 1.5s infinite;
  box-shadow: 0px 0px 1px #ff9900; 
  margin: 0px;
  border-radius: 50%;
 }
 .point_animation span{
  animation-delay: 0.8s;
 }
 @keyframes point_animation{
  10% {
  transform: scale(1);
  }
  100% {
  transform: scale(8);
  }
 }
 .css_animation{
  height:50px; 
  width:50px;
  border-radius: 25px; 
  background: rgba(255, 0, 0, 0.9);
  transform: scale(0);
  animation: mypoint 3s;   
  animation-iteration-count: infinite;
 }
 @keyframes mypoint{
  to{
  transform: scale(1.5);
  background: rgba(0, 0, 0, 0);
  }
 }
 </style>
</head>
 
<body>
 <div id="container"></div>
 <script type="text/javascript">
 var baseLayer = new ol.layer.Tile({
  source: new ol.source.XYZ({
  url: "http://wprd0{1-4}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&style=7&x={x}&y={y}&z={z}",
  }),
 });
 
 var map = new ol.Map({
  layers: [baseLayer],
  view: new ol.View({
  center: [104.5602,32.4070],
  projection: 'EPSG:4326',
  zoom: 4,
  extent: [-180, -90, 180, 90]
  }),
  target: "container",
  interactions:ol.interaction.defaults({
  doubleClickZoom: false
  }),
  controls:ol.control.defaults({
  zoom:false,
  attribution: false,
  }),
 });
 setFlashPoint()
 function setFlashPoint(){
  //第一种样式
  var element = document.createElement("div");
  element.className = "point_animation";
  var p = document.createElement("p");
  var span = document.createElement("span");
  element.appendChild(p);
  element.appendChild(span);
  var point_overlay = new ol.Overlay({
  element: element,
  positioning: 'center-center',
  });
  map.addOverlay(point_overlay);
  point_overlay.setPosition([120,30]);
  //第二种样式
  var ele = document.createElement("div");
  ele.className = "css_animation";
  var point_overlay2 = new ol.Overlay({
  element: ele,
  positioning: 'center-center',
  });
  map.addOverlay(point_overlay2);
  point_overlay2.setPosition([110,30]);
 }
 </script>
</body>
</html>

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