Go 言語と Vue.js を使用してグラフ コンポーネントを構築する方法

type data struct {
        Month    int     `json:"month"`
        Year     int     `json:"year"`
        Revenue  int     `json:"revenue"`
        Expenses int     `json:"expenses"`
        Profit   int     `json:"profit"`
}

func getDataHandler(c echo.Context) error {
    // 解析数据
    year, _ := strconv.Atoi(c.QueryParam("year"))
    month, _ := strconv.Atoi(c.QueryParam("month"))

    // 处理数据，此处我们省略了数据查询和处理代码

    // 返回数据
    response := []data{
        {Month: 1, Year: 2022, Revenue: 100000, Expenses: 50000, Profit: 50000},
        {Month: 2, Year: 2022, Revenue: 75000, Expenses: 40000, Profit: 35000},
        {Month: 3, Year: 2022, Revenue: 120000, Expenses: 80000, Profit: 40000},
        {Month: 4, Year: 2022, Revenue: 85000, Expenses: 60000, Profit: 25000},
        {Month: 5, Year: 2022, Revenue: 105000, Expenses: 75000, Profit: 30000},
        {Month: 6, Year: 2022, Revenue: 95000, Expenses: 55000, Profit: 40000},
        {Month: 7, Year: 2022, Revenue: 140000, Expenses: 65000, Profit: 75000},
        {Month: 8, Year: 2022, Revenue: 120000, Expenses: 45000, Profit: 75000},
        {Month: 9, Year: 2022, Revenue: 115000, Expenses: 50000, Profit: 65000},
        {Month: 10, Year: 2022, Revenue: 95000, Expenses: 60000, Profit: 35000},
        {Month: 11, Year: 2022, Revenue: 80000, Expenses: 40000, Profit: 40000},
        {Month: 12, Year: 2022, Revenue: 125000, Expenses: 80000, Profit: 45000},
    }
    return c.JSON(http.StatusOK, response)
}

<template>
    <div>
        <canvas ref="bar"></canvas>
    </div>
</template>

<script>
    import axios from 'axios';
    import Chart from 'chart.js';

    export default {
        name: 'BarChart',
        mounted() {
            axios.get('/api/data?year=2022').then(response => {
                let data = response.data;

                let ctx = this.$refs.bar.getContext('2d');
                let myChart = new Chart(ctx, {
                    type: 'bar',
                    data: {
                        labels: data.map(d => d.Month),
                        datasets: [{
                            label: 'Revenue',
                            data: data.map(d => d.Revenue),
                            backgroundColor: 'rgba(75, 192, 192, 0.2)',
                            borderColor: 'rgba(75, 192, 192, 1)',
                            borderWidth: 1
                        }, {
                            label: 'Expenses',
                            data: data.map(d => d.Expenses),
                            backgroundColor: 'rgba(255, 99, 132, 0.2)',
                            borderColor: 'rgba(255, 99, 132, 1)',
                            borderWidth: 1
                        }]
                    },
                    options: {
                        responsive: true,
                        scales: {
                            yAxes: [{
                                ticks: {
                                    beginAtZero: true
                                }
                            }]
                        }
                    }
                });
            });
        }
    }
</script>

<template>
    <div :id="divId"></div>
</template>

<script>
    import axios from 'axios';
    import Plotly from 'plotly.js-basic-dist';

    export default {
        props: ['chartData'],
        data() {
            return {
                divId: `scatter${Math.floor(Math.random() * 1000000)}`,
                layout: {
                    title: 'Revenue, Expenses and profit by Month',
                    xaxis: {
                        title: 'Revenue'
                    },
                    yaxis: {
                        title: 'Expenses'
                    },
                    hovermode: 'closest'
                }
            }
        },
        mounted() {
            axios.get('/api/data?year=2022').then(response => {
                let data = response.data;

                let scatterData = {
                    x: data.map(d => d.Revenue),
                    y: data.map(d => d.Expenses),
                    mode: 'markers',
                    hovertemplate: `Revenue: %{x:$,.2f}<br>Expenses: %{y:$,.2f}<br>Profit: %{text:$,.2f}`,
                    text: data.map(d => d.Profit),
                    marker: {
                        color: data.map(d => d.Profit),
                        size: 20,
                        line: {
                            width: 0.5,
                            color: 'white'
                        }
                    }
                };

                Plotly.newPlot(this.divId, [scatterData], this.layout);
            });
        }
    }
</script>

<style scoped>
    .plot {
        max-width: 100%;
        height: 500px;
    }
</style>