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How to use JS and Baidu Maps to implement map track playback function

WBOYOriginal: 2023-11-21 16:59:101359browse

How to use JS and Baidu Maps to implement the map track playback function

In modern society, the map track playback function has become a standard feature of many applications and websites. one. Through the map track playback function, we can display the geographical data points on the map in a certain time sequence, so that users can clearly understand the itinerary or path of a specific place on the map.

JS (JavaScript) is one of the most widely used languages in front-end development, and Baidu Map is one of the most widely used map services in China. This article will introduce how to use JS and Baidu Maps to implement the map track playback function, and provide specific code examples.

First, we need to introduce Baidu Map’s JS library and CSS style into HTML. The code is as follows:

<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>地图轨迹回放</title>
  <style type="text/css">
    #mapContainer {
      width: 1000px;
      height: 600px;
      margin: 0 auto;
    }
  </style>
  <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的百度地图API密钥"></script>
</head>
<body>
  <div id="mapContainer"></div>
</body>
</html>

ak in the above code is the API key provided by Baidu Maps to developers. Developers need to replace it with their own key according to the actual situation.

Then, use Baidu Map’s API in JS code to implement map initialization and track playback functions. The code is as follows:

// 地图的中心点和缩放级别
var map = new BMap.Map("mapContainer");
var point = new BMap.Point(116.404, 39.915);  // 北京
map.centerAndZoom(point, 15);

// 地图的轨迹回放路径
var path = [
  new BMap.Point(116.403865, 39.915654),
  new BMap.Point(116.404274, 39.915873),
  new BMap.Point(116.404365, 39.916072),
  // 更多的地理位置点...
];

// 创建一个图标，用于表示轨迹回放的位置
var marker = new BMap.Marker(path[0]);
map.addOverlay(marker);

// 开始轨迹回放
var i = 0;
function play() {
  if (i < path.length) {
    // 设置当前位置
    marker.setPosition(path[i]);
    // 移动地图视角
    map.panTo(path[i]);
    // 延迟1秒继续回放下一个位置
    setTimeout(play, 1000);
    i++;
  }
}

// 执行轨迹回放
play();

In the above code, we first create the map object and set the center point and zoom level of the map. Then, the path for trajectory playback is defined, and each geographical point is represented by latitude and longitude. Next, we create an icon object to represent the location of the track playback and add it to the map. Finally, a loop delay function is used to play the trajectory of each location in sequence and move the map perspective to the current location.

So far, we have successfully implemented the map track playback function using JS and Baidu Maps. Readers can modify and extend the above code according to actual needs, such as adding more track points, custom animation effects, etc.

To summarize, the map track playback function plays an important role in many application scenarios. By using JS and Baidu Maps API, we can easily implement this function. I hope that the introduction in this article will be helpful to readers and can be applied in actual projects.

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