Use PHP and Amap API to create map route planning

Using PHP and Amap API to create map route planning

Introduction: With the development of the Internet and mobile devices, map applications have become an indispensable part of people's lives. As the leading map service provider in China, Amap provides a rich API interface to facilitate developers to integrate map functions in their applications. In this article, we will use PHP as an example to introduce how to use the Amap API to create the route planning function of the map.

1. Preparation work

Before we start, we need to prepare the following:

• A server or local machine equipped with a PHP environment
• Amap developer account, you can apply on the Amap open platform
• PHP development tools, such as Sublime Text, PHPStorm, etc.

##Introduction API

First of all, at the beginning of the PHP file, we need to introduce the Amap API. It can be introduced in the following ways:

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

Among them, you need to replace "your API_KEY" with the API key you applied for on the Amap open platform.

Create a map container

Next, we need to create a container in HTML for displaying the map. You can use the following code to create a DIV element as a map container:

<div id="mapContainer" style="width: 100%; height: 500px;"></div>

In CSS, we can set the width and height of the map container. Here the width is set to 100% and the height to 500px.

Initialize the map

In PHP, we can use the following code to initialize the map:

<script type="text/javascript">
    var map = new AMap.Map("mapContainer", {
        zoom: 15, // 地图缩放级别
        center: [116.397428, 39.90923] // 地图中心点坐标
    });
</script>

In the above code, we pass AMap.Map () method creates a new map instance and renders it into the DIV element with id mapContainer. The zoom level of this map is set to 15, and the center point coordinates are [116.397428, 39.90923].

Add start and end points

Before route planning, we need to add start and end points markers on the map. The following is a sample code:

<script type="text/javascript">
    var startPoint = new AMap.Marker({
        position: [116.407394, 39.904211], // 起点坐标
        title: '起点'
    });

    var endPoint = new AMap.Marker({
        position: [116.412416, 39.896366], // 终点坐标
        title: '终点'
    });

    map.add([startPoint, endPoint]);
</script>

In the above code, we use the AMap.Marker() method to create the Marker objects of the starting point and the end point, and set their position and title information respectively. Finally, we add the start and end points to the map using the map.add() method.

Route planning

Finally, we use the route planning API of Amap to obtain the planned route between the starting point and the end point. The following is a sample code:

<script type="text/javascript">
    var driving = new AMap.Driving({
        policy: AMap.DrivingPolicy.LEAST_TIME // 规划策略（最短时间）
    });

    driving.search(new AMap.LngLat(116.407394, 39.904211), new AMap.LngLat(116.412416, 39.896366), function(status, result) {
        if (status === 'complete' && result.info === 'OK') {
            var route = result.routes[0];
            var path = [];
            
            // 遍历路线上的每个步骤
            for (var i = 0, l = route.steps.length; i < l; i++) {
                var step = route.steps[i];
                path.push(step.path);
            }

            var polyline = new AMap.Polyline({
                path: path,
                strokeColor: '#00FF00',
                strokeWeight: 4,
                strokeOpacity: 1
            });

            map.add(polyline);
        }
    });
</script>

In the above code, we use the AMap.Driving() method to create a driving route planning instance and set the planning strategy to the shortest time. Next, we use the driving.search() method to query the planned route between the starting point and the end point, and pass in the callback function to process the returned results. In the callback function we can iterate through each step on the route and add it to the map. Finally, we use the AMap.Polyline() method to create a polyline object, set its properties such as path, color, and line width, and then add it to the map through the map.add() method.

Summary:

The above is a simple example of route planning using PHP and Amap API to create a map. Through this example, we can learn how to introduce the API, create a map container, initialize the map, add a starting point and an ending point, and perform basic operations such as route planning. I believe that in actual development, we can expand and adjust accordingly according to specific needs and business logic to achieve more personalized map functions. I hope this article is helpful to you, thank you for reading!

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