Radial Gradients
Hover over the image to see the chart animation
The [ObservableObject]
, [ObservableProperty]
and [RelayCommand]
attributes come from the
CommunityToolkit.Mvvm package, you can read more about it
here.
View Model
using CommunityToolkit.Mvvm.ComponentModel;
using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Painting;
using SkiaSharp;
namespace ViewModelsSamples.Design.RadialGradients;
public partial class ViewModel : ObservableObject
{
// radial gradients are based on SkiaSharp circular gradients
// for more info please see:
// https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/graphics/skiasharp/effects/shaders/circular-gradients
private static readonly SKColor[] s_colors =
{
new SKColor(179, 229, 252),
new SKColor(1, 87, 155)
// ...
// you can add as many colors as you require to build the gradient
// by default all the distance between each color is equal
// use the colorPos parameter in the constructor of the RadialGradientPaint class
// to specify the distance between each color
};
public ISeries[] Series { get; set; } =
{
new PieSeries<int>
{
Name = "Maria",
Values = new []{ 7 },
Stroke = null,
Fill = new RadialGradientPaint(s_colors),
Pushout = 10,
OuterRadiusOffset = 20
},
new PieSeries<int>
{
Name = "Charles",
Values = new []{ 3 },
Stroke = null,
Fill = new RadialGradientPaint(new SKColor(255, 205, 210), new SKColor(183, 28, 28))
}
};
}
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.Design.RadialGradients.View"
xmlns:lvc="clr-namespace:LiveChartsCore.SkiaSharpView.Xamarin.Forms;assembly=LiveChartsCore.SkiaSharpView.XamarinForms"
xmlns:vms="clr-namespace:ViewModelsSamples.Design.RadialGradients;assembly=ViewModelsSamples">
<ContentPage.BindingContext>
<vms:ViewModel/>
</ContentPage.BindingContext>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<lvc:PieChart Series="{Binding Series}" LegendPosition="Right"></lvc:PieChart>
</Grid>
</ContentPage>