How to use JS and Amap to implement path planning function

How to use JS and Amap to implement path planning function

Introduction:

In modern life, the path planning function is something we often need to use Tool of. Whether planning a travel route or planning a transportation route, path planning is very important. In web development, we can use JS and Amap API to implement route planning functions and provide users with convenient route planning services. This article will introduce how to use JS and Amap API for path planning, including specific code examples.

1. Preparation

Before we start writing code, we need to prepare some necessary work. First, we need to introduce the Amap API into our project. You can introduce the Amap API through the following code:

<script type="text/javascript" src="https://webapi.amap.com/maps?v=1.4.15&key=YOUR_KEY"></script>

Among them, YOUR_KEY needs to be replaced with your own Amap API key. If you don't have your own key yet, you can apply for one on the Amap open platform. After the application is successful, replace the key with YOUR_KEY in the above code.

2. Draw the map

After introducing the Amap API, we can start drawing the map. First, you need to create a map container in the page. A map container can be created through the following code:

<div id="map" style="width: 100%; height: 400px;"></div>

Next, we can use JS code to create a map object and display the map in the map container:

var map = new AMap.Map('map');

In this way, a simple map The drawing is complete. Next, we will introduce how to perform path planning.

3. Path planning

1. Walking path planning

First, let’s introduce how to plan the walking path. Walking path planning is the simplest type of path planning. You only need to specify the starting point and end point. The following is a code example to implement walking path planning:

var startLngLat = [116.397428, 39.90923];  // 起点经纬度
var endLngLat = [116.410743, 39.916395];   // 终点经纬度

AMap.plugin('AMap.Walking', function () {
  var walking = new AMap.Walking({
    map: map
  });

  walking.search(startLngLat, endLngLat, function (status, result) {
    if (status === 'complete') {
      // 路径规划成功，可以在地图上展示路径
    } else {
      // 路径规划失败，可以提示用户重新规划路径
    }
  });
});

In the code, we first define the longitude and latitude of the starting point and end point, and then use the AMap.Walking object for path planning. After the path planning is successful, the path can be displayed on the map; if the path planning fails, the user can be prompted to re-plan the path.

2. Driving route planning

Next, we introduce how to carry out driving route planning. Driving route planning requires specifying the starting point and end point, as well as passing points. The following is a code example to implement driving route planning:

var startPoint = '北京东站';  // 起点名称
var endPoint = '北京西站';     // 终点名称
var wayPoints = ['颐和园', '天安门'];  // 途经点名称

AMap.plugin('AMap.Driving', function () {
  var driving = new AMap.Driving({
    policy: AMap.DrivingPolicy.LEAST_FEE,  // 路径规划策略
    map: map
  });

  driving.search(startPoint, endPoint, {waypoints: wayPoints}, function (status, result) {
    if (status === 'complete') {
      // 路径规划成功，可以在地图上展示路径
    } else {
      // 路径规划失败，可以提示用户重新规划路径
    }
  });
});

In the code, we first define the names of the starting and ending points, as well as the names of the passing points. Then use the AMap.Driving object for path planning. After the path planning is successful, the path can be displayed on the map; if the path planning fails, the user can be prompted to re-plan the path.

Summary:

It is not complicated to implement the route planning function using JS and Amap API. You only need to prepare the map container, introduce the Amap API, and then use the corresponding API object for path planning. I hope this article can help you realize your own path planning function.

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