Basic Heat

View Model

using System.Collections.ObjectModel;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.Defaults;
using LiveChartsCore.SkiaSharpView;
using SkiaSharp;

namespace ViewModelsSamples.Heat.Basic;

public partial class ViewModel : ObservableObject
{
    public ISeries[] Series { get; set; } =
    {
        new HeatSeries<WeightedPoint>
        {
            HeatMap = new[]
            {
                new SKColor(255, 241, 118).AsLvcColor(), // the first element is the "coldest"
                SKColors.DarkSlateGray.AsLvcColor(),
                SKColors.Blue.AsLvcColor() // the last element is the "hottest"
            },
            Values = new ObservableCollection<WeightedPoint>
            {
                // Charles
                new(0, 0, 150), // Jan
                new(0, 1, 123), // Feb
                new(0, 2, 310), // Mar
                new(0, 3, 225), // Apr
                new(0, 4, 473), // May
                new(0, 5, 373), // Jun

                // Richard
                new(1, 0, 432), // Jan
                new(1, 1, 312), // Feb
                new(1, 2, 135), // Mar
                new(1, 3, 78), // Apr
                new(1, 4, 124), // May
                new(1, 5, 423), // Jun

                // Ana
                new(2, 0, 543), // Jan
                new(2, 1, 134), // Feb
                new(2, 2, 524), // Mar
                new(2, 3, 315), // Apr
                new(2, 4, 145), // May
                new(2, 5, 80), // Jun

                // Mari
                new(3, 0, 90), // Jan
                new(3, 1, 123), // Feb
                new(3, 2, 70), // Mar
                new(3, 3, 123), // Apr
                new(3, 4, 432), // May
                new(3, 5, 142), // Jun
            },
        }
    };

    public Axis[] XAxes { get; set; } =
    {
        new Axis
        {
            Labels = new[] { "Charles", "Richard", "Ana", "Mari" }
        }
    };

    public Axis[] YAxes { get; set; } =
    {
        new Axis
        {
            Labels = new[] { "Jan", "Feb", "Mar", "Apr", "May", "Jun" }
        }
    };
}

Code Behind

using System.Windows.Forms;
using LiveChartsCore.SkiaSharpView.WinForms;
using ViewModelsSamples.Heat.Basic;

namespace WinFormsSample.Heat.Basic;

public partial class View : UserControl
{
    public View()
    {
        InitializeComponent();
        Size = new System.Drawing.Size(50, 50);

        var viewModel = new ViewModel();

        var cartesianChart = new CartesianChart
        {
            Series = viewModel.Series,
            XAxes = viewModel.XAxes,
            YAxes = viewModel.YAxes,

            // 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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