Customize Visuals

View Model

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

namespace ViewModelsSamples.General.MapPoints;

public partial class ViewModel : ObservableObject
{
    public ViewModel()
    {
        var paints = new SolidColorPaint[]
        {
            new(SKColors.Red),
            new(SKColors.Green),
            new(SKColors.Blue),
            new(SKColors.Yellow)
        };

        var series = new ColumnSeries<int>
        {
            Values = new[] { 2, 5, 4, 6, 8, 3, 2, 4, 6 },
            DataLabelsPaint = new SolidColorPaint(new SKColor(30, 30, 30)),
            DataLabelsPosition = DataLabelsPosition.Top
        }
        .OnPointMeasured(point =>
        {
            // this method is called for each point in the series
            // we can customize the visual here

            if (point.Visual is null) return;

            // get a paint from the array
            var paint = paints[point.Index % paints.Length];
            // set the paint to the visual
            point.Visual.Fill = paint;
        });

        Series = new ISeries[] { series };
    }

    public ISeries[] Series { get; set; }
}

Code Behind

using System.Windows.Forms;
using LiveChartsCore.SkiaSharpView.WinForms;
using ViewModelsSamples.General.MapPoints;

namespace WinFormsSample.General.MapPoints;

public partial class View : UserControl
{
    private readonly CartesianChart cartesianChart;

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

        var viewModel = new ViewModel();

        cartesianChart = new CartesianChart
        {
            Series = viewModel.Series,

            // 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(cartesianChart);
    }
}

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