Racing Bars

sample image

View model


using System;
using System.Linq;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.Defaults;
using LiveChartsCore.Drawing;
using LiveChartsCore.Measure;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;

namespace ViewModelsSamples.Bars.Race;

[ObservableObject]
public partial class ViewModel
{
    private readonly Random _r = new();
    private static readonly (string, double)[] s_initialData =
    {
        ("Tsunoda", 500),
        ("Sainz", 450),
        ("Riccardo", 520),
        ("Bottas", 550),
        ("Perez", 660),
        ("Verstapen", 920),
        ("Hamilton", 1000)
    };

    [ObservableProperty]
    private ISeries[] _series =
        s_initialData
            .Select(x => new RowSeries<ObservableValue>
            {
                Values = new[] { new ObservableValue(x.Item2) },
                Name = x.Item1,
                Stroke = null,
                MaxBarWidth = 25,
                DataLabelsPaint = new SolidColorPaint(new SKColor(245, 245, 245)),
                DataLabelsPosition = DataLabelsPosition.End,
                DataLabelsTranslate = new LvcPoint(-1, 0),
                DataLabelsFormatter = point => $"{point.Context.Series.Name} {point.PrimaryValue}"
            })
            .OrderByDescending(x => ((ObservableValue[])x.Values!)[0].Value)
            .ToArray();

    [ObservableProperty]
    private Axis[] _xAxes = { new Axis { SeparatorsPaint = new SolidColorPaint(new SKColor(220, 220, 220)) } };

    [ObservableProperty]
    private Axis[] _yAxes = { new Axis { IsVisible = false } };

    public void RandomIncrement()
    {
        foreach (var item in Series)
        {
            if (item.Values is null) continue;

            var i = ((ObservableValue[])item.Values)[0];
            i.Value += _r.Next(0, 100);
        }

        Series = Series.OrderByDescending(x => ((ObservableValue[])x.Values!)[0].Value).ToArray();
    }
}

using System.Threading.Tasks;
using Eto.Forms;
using LiveChartsCore.SkiaSharpView.Eto;
using ViewModelsSamples.Bars.Race;

namespace EtoFormsSample.Bars.Race;

public class View : Panel
{
    private readonly CartesianChart cartesianChart;
    private readonly ViewModel viewModel;

    public View()
    {
        viewModel = new ViewModel();

        cartesianChart = new CartesianChart
        {
            Series = viewModel.Series,
            XAxes = viewModel.XAxes,
            YAxes = viewModel.YAxes,
            TooltipPosition = LiveChartsCore.Measure.TooltipPosition.Hidden
        };

        Content = cartesianChart;

        UpdateViewModel();

        UnLoad += (o, e) => Visible = false;
    }

    public async void UpdateViewModel()
    {
        while (Visible)
        {
            viewModel.RandomIncrement();
            cartesianChart.Series = viewModel.Series;
            await Task.Delay(100);
        }
    }
}

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