How to use geographical coordinate system to display map data in ECharts

How to use the geographical coordinate system to display map data in ECharts

The geographical coordinate system is a commonly used coordinate system type in ECharts, which can be used to display map data The data. Through the geographical coordinate system, we can display various data on the map, such as geographical distribution, regional heat, administrative divisions, etc. This article will introduce how to use the geographical coordinate system in ECharts to display map data and provide specific code examples.

1. Preparation work
To use the geographical coordinate system to display map data in ECharts, we first need to prepare the map data. ECharts provides some commonly used map data, such as the boundaries of provinces and cities across the country, the boundaries of various countries in the world, etc. We can directly use these data to display maps. In addition, if we need to display customized map data, we can also create and import map data according to the map data format provided by ECharts.

2. Configure the geographical coordinate system

1. Introduce the ECharts library file

First, we need to introduce the ECharts library file into the HTML file. You can download the latest version of the ECharts library file from the ECharts official website (https://echarts.apache.org/zh/index.html), and then introduce it into the HTML file. The following is a sample code that introduces the ECharts library file:

<script src="echarts.min.js"></script>

2. Create container

In the HTML file, we need to create a container for displaying the map. You can use a div element as a container and then set a unique id for it, like this:

<div id="mapContainer" style="width: 100%; height: 600px;"></div>

3. Initialize ECharts instance

In the JavaScript code, we need Initialize an ECharts instance and bind it to the container you just created. In this way, ECharts knows which container to display the map data on. The following is sample code to initialize an ECharts instance:

var myChart = echarts.init(document.getElementById('mapContainer'));

4. Configuring the geographical coordinate system

Next, we need to configure the geographical coordinate system. In ECharts, we can configure the ECharts instance by calling the setOption method. The following is a sample code for configuring a geographic coordinate system:

myChart.setOption({
    // 设置地理坐标系
    geo: {
        map: 'china' // 地图类型，可以是ECharts提供的地图数据或自定义的地图数据
    },
    // 其他配置项...
});

In the code, we specify the type of map by setting the map attribute in the geo object. "china" here means using the China map data provided by ECharts. If you need to display map data from other regions, you can modify this parameter according to the actual situation.

3. Display map data

After the geographical coordinate system configuration is completed, we can start to display map data. In the configuration items of ECharts, we can configure map data through the series attribute. The following is a sample code for displaying map data:

myChart.setOption({
    // 配置地理坐标系...
    series: [
        {
            name: '地图数据',
            type: 'map',
            map: 'china', // 地图类型，要与geo中的map属性值一致
            data: [] // 地图数据
        }
    ]
});

In the code, we display map data by configuring a map type series in the series array. In the data attribute of this series, specific map data can be set. The format of map data is generally an array of objects, each object contains a place name (name) and a corresponding value (value). According to the actual situation, the corresponding place names and values ​​can be set to display the data on the map.

4. Complete code example

The following is a complete code example that uses a geographical coordinate system to display map data:

    
    
    <script src="echarts.min.js"></script>



    <div id="mapContainer" style="width: 100%; height: 600px;"></div>
    <script>
        var myChart = echarts.init(document.getElementById('mapContainer'));
        myChart.setOption({
            geo: {
                map: 'china'
            },
            series: [
                {
                    name: '地图数据',
                    type: 'map',
                    map: 'china',
                    data: [
                        {name: '北京', value: 100},
                        {name: '上海', value: 200},
                        {name: '广州', value: 300},
                        // 更多地图数据...
                    ]
                }
            ]
        });
    </script>

In the above code, we initialize an ECharts instance , and bind it to the container with the id "mapContainer". Then, the geographical coordinate system and a set of map data are configured, and finally the map data is displayed on the map.

5. Summary

This article introduces how to use the geographical coordinate system in ECharts to display map data, and provides specific code examples. Through the geographical coordinate system, we can display a variety of data on the map. Using ECharts to display map data is not only simple and convenient, but also powerful and can meet our needs for map data visualization. I hope this article can help you and inspire you when displaying map data in ECharts.

The above is the detailed content of How to use geographical coordinate system to display map data in ECharts. For more information, please follow other related articles on the PHP Chinese website!