Sharing An Axis

View model

using System;
using LiveChartsCore;
using LiveChartsCore.Measure;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;

namespace ViewModelsSamples.Axes.Shared;

public class ViewModel
{
    public ISeries[] SeriesCollection1 { get; set; }
    public ISeries[] SeriesCollection2 { get; set; }
    public Axis[] X1 { get; set; }
    public Axis[] X2 { get; set; }
    public Margin DrawMargin { get; set; }

    public ViewModel()
    {
        var values1 = Fetch();
        var values2 = Fetch();

        SeriesCollection1 = [new LineSeries<int> { Values = values1 }];
        SeriesCollection2 = [new ColumnSeries<int> { Values = values2 }];

        // ideally, when sharing an axis, you should set the // mark
        // initial limits for all the axes involved. // mark
        var padding = 3;
        var start = 0 - padding;
        var end = values1.Length - 1 + padding;

        X1 = [
            new Axis
            {
                MinLimit = start,
                MaxLimit = end,
                CrosshairLabelsBackground = SKColors.OrangeRed.AsLvcColor(),
                CrosshairLabelsPaint = new SolidColorPaint(SKColors.White),
                CrosshairPaint = new SolidColorPaint(SKColors.OrangeRed.WithAlpha(50), 4),
                CrosshairPadding = new(8),
                Labeler = value => value.ToString("N2")
            }
        ];
        X2 = [
            new Axis
            {
                MinLimit = start,
                MaxLimit = end,
                CrosshairPaint = new SolidColorPaint(SKColors.OrangeRed.WithAlpha(50), 4)
            }
        ];

        SharedAxes.Set(X1[0], X2[0]);

        // Force the chart to use 70px margin on the left, this way we can align both charts Y axes. // mark
        DrawMargin = new Margin(70, Margin.Auto, Margin.Auto, Margin.Auto);

        // Advanced alternative:
        // you can also ask an axis its posible dimensions to determine the margin you need.

        // First you need to get a chart from the UI
        // in this sample we use the in-memory chart provided by the library.

        // var cartesianChart = new SKCartesianChart();
        // var axis = cartesianChart.YAxes.First() as Axis;
        // var size = axis.GetPossibleSize(cartesianChart.Core);

        // finally instead of using the static 70px, we can use the actual width of the axis.

        // DrawMargin = new Margin(size.Width, Margin.Auto, Margin.Auto, Margin.Auto);

        // normally you would need measure all the axes involved, and use the greater width to
        // calculate the required margin.
    }

    private static int[] Fetch()
    {
        var values = new int[50];
        var r = new Random();
        var t = 0;

        for (var i = 0; i < 50; i++)
        {
            t += r.Next(-90, 100);
            values[i] = t;
        }

        return values;
    }
}

HTML

@page "/Axes/Shared"
@using LiveChartsCore.SkiaSharpView.Blazor
@using ViewModelsSamples.Axes.Shared

<div style="max-width: 400px">
	<CartesianChart
		Series="ViewModel.SeriesCollection1"
		XAxes="ViewModel.X1"
        DrawMargin="ViewModel.DrawMargin"
		ZoomMode="LiveChartsCore.Measure.ZoomAndPanMode.X">
	</CartesianChart>
</div>

<div style="max-width: 400px">
	<LiveChartsCore.SkiaSharpView.Blazor.CartesianChart
		Series="ViewModel.SeriesCollection2"
		XAxes="ViewModel.X2"
        DrawMargin="ViewModel.DrawMargin"
		ZoomMode="LiveChartsCore.Measure.ZoomAndPanMode.X">
	</LiveChartsCore.SkiaSharpView.Blazor.CartesianChart>
</div>

@code {
	public ViewModel ViewModel { get; set; } = new();
}

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