Angular Gauge

sample image

View model

using System.Collections.Generic;
using LiveChartsCore;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Extensions;
using LiveChartsCore.VisualElements;
using LiveChartsCore.SkiaSharpView.Drawing;
using LiveChartsCore.SkiaSharpView.VisualElements;
using LiveChartsCore.Defaults;
using CommunityToolkit.Mvvm.Input;
using System;

namespace ViewModelsSamples.Pies.AngularGauge;

public partial class ViewModel : ObservableObject
{
    private readonly Random _random = new();

    public ViewModel()
    {
        var sectionsOuter = 130;
        var sectionsWidth = 20;

        Needle = new NeedleVisual
        {
            Value = 45
        };

        Series = GaugeGenerator.BuildAngularGaugeSections(
            new GaugeItem(60, s => SetStyle(sectionsOuter, sectionsWidth, s)),
            new GaugeItem(30, s => SetStyle(sectionsOuter, sectionsWidth, s)),
            new GaugeItem(10, s => SetStyle(sectionsOuter, sectionsWidth, s)));

        VisualElements = new VisualElement<SkiaSharpDrawingContext>[]
        {
            new AngularTicksVisual
            {
                LabelsSize = 16,
                LabelsOuterOffset = 15,
                OuterOffset = 65,
                TicksLength = 20
            },
            Needle
        };
    }

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

    public IEnumerable<VisualElement<SkiaSharpDrawingContext>> VisualElements { get; set; }

    public NeedleVisual Needle { get; set; }

    [RelayCommand]
    public void DoRandomChange()
    {
        // modifying the Value property updates and animates the chart automatically
        Needle.Value = _random.Next(0, 100);
    }

    private static void SetStyle(
        double sectionsOuter, double sectionsWidth, PieSeries<ObservableValue> series)
    {
        series.OuterRadiusOffset = sectionsOuter;
        series.MaxRadialColumnWidth = sectionsWidth;
    }
}

Form code behind

using System.Windows.Forms;
using LiveChartsCore.SkiaSharpView.WinForms;
using ViewModelsSamples.Pies.AngularGauge;

namespace WinFormsSample.Pies.AngularGauge;

public partial class View : UserControl
{
    private readonly PieChart pieChart;

    public View()
    {
        InitializeComponent();
        Size = new System.Drawing.Size(50, 50);

        var viewModel = new ViewModel();

        pieChart = new PieChart
        {
            Series = viewModel.Series,
            VisualElements = viewModel.VisualElements,
            InitialRotation = -225,
            MaxAngle = 270,
            MinValue = 0,
            MaxValue = 100,

            // out of livecharts properties...
            Location = new System.Drawing.Point(0, 0),
            Size = new System.Drawing.Size(50, 50),
            Anchor = AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Top | AnchorStyles.Bottom
        };

        Controls.Add(pieChart);

        var b1 = new Button { Text = "Update", Location = new System.Drawing.Point(0, 0) };
        b1.Click += (object sender, System.EventArgs e) => viewModel.DoRandomChange();
        Controls.Add(b1);
        b1.BringToFront();
    }
}

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