跨平台图表解决方案：探索功能丰富的.NET开源库

发表时间: 2024-04-27 09:02

前言

今天大姚给大家分享一个.NET开源（MIT License）、功能强大、简单、灵活、跨平台的图表、地图和仪表库：LiveCharts2。

项目介绍

LiveCharts2是一个.NET开源、简单、灵活、交互式且功能强大的.NET图表、地图和仪表，现在几乎可以在任何地方运行如：Maui、Uno Platform、Blazor-wasm、WPF、WinForms、Xamarin、Avalonia、WinUI、UWP。

在线API文档：https://livecharts.dev/docs/blazor/2.0.0-rc2/gallery

项目源代码

Blazor Wasm中快速使用

创建Blazor WebAssembly项目

安装NuGet

LiveChartsCore.SkiaSharpView.Blazor

Basic Bars

View Model

using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;

namespace ViewModelsSamples.Bars.Basic;

public partial class ViewModel : ObservableObject
{
 public ISeries[] Series { get; set; } =
 {
 new ColumnSeries<double>
 {
 Name = "Mary",
 Values = new double[] { 2, 5, 4 }
 },
 new ColumnSeries<double>
 {
 Name = "Ana",
 Values = new double[] { 3, 1, 6 }
 }
 };

 public Axis[] XAxes { get; set; } =
 {
 new Axis
 {
 Labels = new string[] { "Category 1", "Category 2", "Category 3" },
 LabelsRotation = 0,
 SeparatorsPaint = new SolidColorPaint(new SKColor(200, 200, 200)),
 SeparatorsAtCenter = false,
 TicksPaint = new SolidColorPaint(new SKColor(35, 35, 35)),
 TicksAtCenter = true,
 // By default the axis tries to optimize the number of 
 // labels to fit the available space, 
 // when you need to force the axis to show all the labels then you must: 
 ForceStepToMin = true, 
 MinStep = 1 
 }
 };
}

HTML

@page "/Bars/Basic"
@using LiveChartsCore.SkiaSharpView.Blazor
@using ViewModelsSamples.Bars.Basic

<CartesianChart
 Series="ViewModel.Series"
 XAxes="ViewModel.XAxes"
 LegendPosition="LiveChartsCore.Measure.LegendPosition.Right">
</CartesianChart>

@code {
 public ViewModel ViewModel { get; set; } = new();
}

Delayed Animations

View model

using System;
using System.Collections.Generic;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.Drawing;
using LiveChartsCore.Kernel;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Drawing.Geometries;

namespace ViewModelsSamples.Bars.DelayedAnimation;

public partial class ViewModel : ObservableObject
{
 public ViewModel()
 {
 var values1 = new List<float>();
 var values2 = new List<float>();

 var fx = EasingFunctions.BounceInOut; // this is the function we are going to plot
 var x = 0f;

while (x <= 1)
 {
 values1.Add(fx(x));
 values2.Add(fx(x - 0.15f));
 x += 0.025f;
 }

 var columnSeries1 = new ColumnSeries<float>
 {
 Values = values1,
 Stroke = ,
 Padding = 2
 };

 var columnSeries2 = new ColumnSeries<float>
 {
 Values = values2,
 Stroke = ,
 Padding = 2
 };

 columnSeries1.PointMeasured += OnPointMeasured;
 columnSeries2.PointMeasured += OnPointMeasured;

 Series = new List<ISeries> { columnSeries1, columnSeries2 };
 }

 private void OnPointMeasured(ChartPoint<float, RoundedRectangleGeometry, LabelGeometry> point)
 {
 var perPointDelay = 100; // milliseconds
 var delay = point.Context.Entity.MetaData!.EntityIndex * perPointDelay;
 var speed = (float)point.Context.Chart.AnimationsSpeed.TotalMilliseconds + delay;

 point.Visual?.SetTransition(
 new Animation(progress =>
 {
 var d = delay / speed;

return progress <= d
 ? 0
 : EasingFunctions.BuildCustomElasticOut(1.5f, 0.60f)((progress - d) / (1 - d));
 },
 TimeSpan.FromMilliseconds(speed)));
 }

 public List<ISeries> Series { get; set; }
}

HTML

@page "/Bars/DelayedAnimation"
@using LiveChartsCore.SkiaSharpView.Blazor
@using ViewModelsSamples.Bars.DelayedAnimation

<CartesianChart
 Series="ViewModel.Series">
</CartesianChart>

@code {
 public ViewModel ViewModel { get; set; } = new();
}