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" }
        }
    };
}

XAML

<UserControl x:Class="AvaloniaSample.Heat.Basic.View"
             xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:lvc="using:LiveChartsCore.SkiaSharpView.Avalonia"
             xmlns:vms="using:ViewModelsSamples.Heat.Basic">
  <UserControl.DataContext>
    <vms:ViewModel/>
  </UserControl.DataContext>
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <lvc:CartesianChart Series="{Binding Series}"
                        XAxes="{Binding XAxes}"
                        YAxes="{Binding YAxes}">
        
    </lvc:CartesianChart>
  </Grid>  
</UserControl>

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