Crosshairs
The [ObservableObject], [ObservableProperty] and [RelayCommand] attributes come from the
CommunityToolkit.Mvvm package, you can read more about it
here.
View model
using System.Collections.ObjectModel;
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;
namespace ViewModelsSamples.Axes.Crosshairs;
public partial class ViewModel : ObservableObject
{
public ISeries[] Series { get; set; } =
{
new LineSeries<double>
{
Values = new ObservableCollection<double> { 200, 558, 458, 249, 457, 339, 587 },
},
new LineSeries<double>
{
Values = new ObservableCollection<double> { 210, 400, 300, 350, 219, 323, 618 },
},
};
public Axis[] XAxes { get; set; } =
{
new Axis
{
CrosshairLabelsBackground = SKColors.DarkOrange.AsLvcColor(),
CrosshairLabelsPaint = new SolidColorPaint(SKColors.DarkRed, 1),
CrosshairPaint = new SolidColorPaint(SKColors.DarkOrange, 1),
Labeler = value => value.ToString("N2")
}
};
public Axis[] YAxes { get; set; } =
{
new Axis
{
CrosshairLabelsBackground = SKColors.DarkOrange.AsLvcColor(),
CrosshairLabelsPaint = new SolidColorPaint(SKColors.DarkRed, 1),
CrosshairPaint = new SolidColorPaint(SKColors.DarkOrange, 1),
CrosshairSnapEnabled = true // snapping is also supported
}
};
}
XAML
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="XamarinSample.Axes.Crosshairs.View"
xmlns:lvc="clr-namespace:LiveChartsCore.SkiaSharpView.Xamarin.Forms;assembly=LiveChartsCore.SkiaSharpView.XamarinForms"
xmlns:vms="clr-namespace:ViewModelsSamples.Axes.Crosshairs;assembly=ViewModelsSamples">
<ContentPage.BindingContext>
<vms:ViewModel/>
</ContentPage.BindingContext>
<Grid>
<lvc:CartesianChart
Series="{Binding Series}"
XAxes="{Binding XAxes}"
YAxes="{Binding YAxes}">
</lvc:CartesianChart>
</Grid>
</ContentPage>
