.NET开源、功能强大、跨平台的图表库-阿里云开发者社区

.NET开源、功能强大、跨平台的图表库

2024-05-01 32

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简介： .NET开源、功能强大、跨平台的图表库

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