クイック スタート: Go 言語関数を使用して簡単なデータ視覚化マップ表示を実装する

北京, 116.40, 39.90
上海, 121.47, 31.23
广州, 113.27, 23.13
深圳, 114.07, 22.62

package main

import (
    "fmt"
    "os"
    "strings"
)

type City struct {
    Name string
    Lat  float64
    Lng  float64
}

func ReadMapData(filename string) ([]City, error) {
    file, err := os.Open(filename)
    if err != nil {
        return nil, err
    }
    defer file.Close()

    var cities []City
    var line string
    for {
        _, err := fmt.Fscanf(file, "%s, %f, %f
", &line)
        if err != nil {
            break
        }

        data := strings.Split(line, ", ")
        if len(data) != 3 {
            continue
        }

        city := City{
            Name: data[0],
            Lat:  data[1],
            Lng:  data[2],
        }

        cities = append(cities, city)
    }

    return cities, nil
}

func main() {
    cities, err := ReadMapData("map_data.txt")
    if err != nil {
        fmt.Println("Error:", err)
        return
    }

    fmt.Println(cities)
}

package main

import (
    "fmt"
    "github.com/go-echarts/go-echarts/charts"
    "os"
    "strings"
)

type City struct {
    Name string
    Lat  float64
    Lng  float64
}

func ReadMapData(filename string) ([]City, error) {
    // ...

func main() {
    cities, err := ReadMapData("map_data.txt")
    // ...

    // Create a new map chart
    mapChart := charts.NewMap("中国地图")
    mapChart.Add("城市", cities)

    // Set chart options
    mapChart.SetGlobalOptions(charts.TitleOpts{Title: "中国地图"})

    // Save chart as HTML file
    file, err := os.Create("map.html")
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    defer file.Close()

    mapChart.Render(file)
}