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通过设置 ChartType 更改图表为 doughnut

Demo
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@page "/charts/doughnut"

<DemoBlock Title="Doughnut 图" Introduction="通过设置 <code>ChartType</code> 更改图表为 <code>doughnut</code> 图" Name="Doughnut">
    <Chart ChartType="ChartType.Doughnut" Angle="@Angle" OnInitAsync="@OnInit" OnAfterInitAsync="@OnAfterInit" OnAfterUpdateAsync="@OnAfterUpdate" @ref="DoughnutChart" class="pie" />
    <div class="text-center mt-2 chart">
        <div class="btn-group">
            <button class="btn btn-primary" @onclick="e => Utility.RandomData(DoughnutChart)"><i class="fa fa-slack"></i><span>随机数据</span></button>
            <button class="btn btn-primary" @onclick="e => Utility.AddDataSet(DoughnutChart, ref DoughnutDatasetCount)"><i class="fa fa-plus-circle"></i><span>添加数据集</span></button>
            <button class="btn btn-primary" @onclick="e => Utility.RemoveDataSet(DoughnutChart, ref DoughnutDatasetCount)"><i class="fa fa-minus-circle"></i><span>移除数据集</span></button>
            <button class="btn btn-primary" @onclick="e => Utility.AddData(DoughnutChart, ref DoughnutDataCount)"><i class="fa fa-plus"></i><span>添加数据</span></button>
            <button class="btn btn-primary" @onclick="e => Utility.RemoveData(DoughnutChart, ref DoughnutDataCount)"><i class="fa fa-minus"></i><span>移除数据</span></button>
            <button class="btn btn-primary" @onclick="@ToggleCircle"><i class="fa fa-circle-o-notch"></i><span>半圆/全圆</span></button>
        </div>
    </div>
    <BlockLogger @ref="Logger" class="mt-3" />
</DemoBlock>

<ChartToast />
// Copyright (c) Argo Zhang (argo@163.com). All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
// Website: https://www.blazor.zone or https://argozhang.github.io/

using BootstrapBlazor.Components;
using BootstrapBlazor.Shared.Components;
using System;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading.Tasks;

namespace BootstrapBlazor.Shared.Samples.Charts;

/// <summary>
/// 
/// </summary>
public partial class Doughnut
{
    private Random Randomer { get; } = new Random();
    private int DoughnutDatasetCount = 1;
    private int DoughnutDataCount = 5;

    [NotNull]
    private Chart? DoughnutChart { get; set; }

    [NotNull]
    private BlockLogger? Logger { get; set; }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="firstRender"></param>
    protected override void OnAfterRender(bool firstRender)
    {
        base.OnAfterRender(firstRender);

        if (firstRender)
        {
            Logger.Log("Doughnut 正在加载数据 ...");
        }
    }

    private Task OnAfterInit()
    {
        Logger.Log("Doughnut 初始化完毕");
        return Task.CompletedTask;
    }

    private Task OnAfterUpdate(ChartAction action)
    {
        Logger.Log($"Doughnut 图更新数据操作完毕 -- {action}");
        return Task.CompletedTask;
    }

    private Task<ChartDataSource> OnInit()
    {
        var ds = new ChartDataSource();
        ds.Options.Title = "Doughnut 圆环图";
        ds.Labels = Utility.Colors.Take(DoughnutDataCount);
        for (var index = 0; index < DoughnutDatasetCount; index++)
        {
            ds.Data.Add(new ChartDataset()
            {
                Label = $"数据集 {index}",
                Data = Enumerable.Range(1, DoughnutDataCount).Select(i => Randomer.Next(20, 37)).Cast<object>()
            });
        }
        return Task.FromResult(ds);
    }

    private bool IsCircle { get; set; }
    private int Angle { get; set; }
    private async Task ToggleCircle()
    {
        IsCircle = !IsCircle;
        Angle = IsCircle ? 360 : 0;
        await DoughnutChart.Update(ChartAction.SetAngle);
    }
}

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