
Doughnut 图
通过设置 ChartType
更改图表为 doughnut
图
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;
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);
}
}