The Pie Chart Control

The PieChart control can build Pie, Doughnut and gauges charts, this article will cover only Pie and Doughnut charts, if you need to know more about gauges please read this guide.

using LiveChartsCore;
using LiveChartsCore.SkiaSharpView;

namespace ViewModelsSamples.Pies.Basic
{
    public class ViewModel
    {
        public ISeries[] Series { get; set; }
            = new ISeries[]
            {
                new PieSeries<double> { Values = new double[] { 2 } },
                new PieSeries<double> { Values = new double[] { 4 } },
                new PieSeries<double> { Values = new double[] { 1 } },
                new PieSeries<double> { Values = new double[] { 4 } },
                new PieSeries<double> { Values = new double[] { 3 } }
            };
    }
}

<lvc:PieChart
    Series="{Binding Series}">
</lvc:PieChart>

InitialRotation property

Controls the angle in degrees where the first slice is drawn, the InitialRotation property will change the start angle of the pie, the following diagram explains where the PieChart rotation starts:

<lvc:PieChart
    InitialRotation="-90">
</lvc:PieChart>

Notice a change in the InitialRotation property is animated automatically based on the chart animations settings:

MaxAngle property

This property determines the complete angle in degrees of the chart, the default value is 360.

<lvc:PieChart
    MaxAngle="270">
</lvc:PieChart>

Notice the MaxAngle property is animated automatically based on the chart animations settings:

AnimationsSpeed property

Defines the animations speed of all the chart elements (axes, series, sections).

<lvc:CartesianChart
    Series="{Binding Series}"
    AnimationsSpeed="00:00:00.500"> <!-- 500 milliseconds --> <!-- mark -->
</lvc:CartesianChart>

EasingFunction property

This property defines the way the shapes in the chart animate, in other words it controls the way the IMotionProperties of all the chart elements (axes, series, sections) in the chart move from a state 'A' to state 'B'.

The property is of type Func<float, float>, it means that it is a function that takes a float argument (the time elapsed from 0 to 1), and returns float value as the result (the progress of the animation from 0 to 1), you can learn more about easing curves at this article.

<Container
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:lvcore="clr-namespace:LiveChartsCore;assembly=LiveChartsCore"> <!-- import the core ns --> <!-- mark -->

    <lvc:CartesianChart
        Series="{Binding Series}"
        AnimationsSpeed="00:00:00.500"
        EasingFunction="{Binding Source={x:Static lvcore:EasingFunctions.BounceOut}}"> <!-- mark -->
    </lvc:CartesianChart>
    
</Container>

Now the chart will animate following the BounceOut curve.

Now try the LiveChartsCore.EasingFunctions.Lineal function, it will animate things lineally as the time elapses.

Finally you can also build your own function:

public Func<float, float> Easing { get; set; } = time => time * time; // mark

<Control
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <lvc:CartesianChart
        Series="{Binding Series}"
        AnimationsSpeed="00:00:00.500"
        EasingFunction="{Binding Easing}"> <!-- mark -->
    </lvc:CartesianChart>

The library also provides some builders based on d3-ease easing curves, the builders.

Func easingCurve = LiveChartsCore.EasingFunctions.BuildCustomBackOut(0.8f);
Func easingCurve = LiveChartsCore.EasingFunctions.BuildCustomElasticOut(0.8f, 1.1f);
// there are more builders, check them out all, they start with Build{ function }({ args })

Disable animations

Settings the EasingFunction to null disables animations.

<lvc:CartesianChart
    EasingFunction="{x:Null}"> <!-- mark -->
</lvc:CartesianChart>

DrawMargin property

Defines the distance from the axes (or edge of the chart if there is no axis) to the draw margin area.

// Notice the constructor of the Margin class has multiple overloads
// https://lvcharts.com/api/2.0.0-beta.920/LiveChartsCore.Measure.Margin
public LiveChartsCore.Measure.Margin Margin { get; set; } = new LiveChartsCore.Measure.Margin(100); // mark

<lvc:CartesianChart
    Series="{Binding Series}"
    DrawMargin="{Binding Margin}"> <!-- mark -->
</lvc:CartesianChart>

Tooltips

Tooltips are popups that help the user to read a chart as the pointer moves.

This is a brief sample about how to use the main features of the IChartTooltip<T> interface, you can find a more detailed article at the button below or at the API explorer.

You can place a tooltip at Top, Bottom, Left, Right, Center or Hidden positions, for now tooltips for the PieChart class only support the Center position, default value is Top.

<lvc:CartesianChart
    Series="{Binding Series}"
    TooltipPosition="Top"><!-- mark -->
</lvc:CartesianChart>
<lvc:CartesianChart
    Series="{Binding Series}"
    TooltipPosition="Bottom"><!-- mark -->
</lvc:CartesianChart>
<lvc:CartesianChart
    Series="{Binding Series}"
    TooltipPosition="Left"><!-- mark -->
</lvc:CartesianChart>
<lvc:CartesianChart
    Series="{Binding Series}"
    TooltipPosition="Right"><!-- mark -->
</lvc:CartesianChart>
<lvc:CartesianChart
    Series="{Binding Series}"
    TooltipPosition="Center"><!-- mark -->
</lvc:CartesianChart>
<lvc:CartesianChart
    Series="{Binding Series}"
    TooltipPosition="Hidden"><!-- mark -->
</lvc:CartesianChart>

Legends

A legend is a visual element that displays a list with the name, stroke and fills of the series in a chart:

This is a brief sample about how to use the main features of the IChartLegend<T> interface, you can find a more detailed article at the button below or at the API explorer.

You can place a legend at Top, Bottom, Left, Right or Hidden positions, notice the Hidden position will disable legends in a chart, default value is Hidden.

<lvc:CartesianChart
    Series="{Binding Series}"
    LegendPosition="Top"><!-- mark -->
</lvc:CartesianChart>
<lvc:CartesianChart
    Series="{Binding Series}"
    LegendPosition="Bottom"><!-- mark -->
</lvc:CartesianChart>
<lvc:CartesianChart
    Series="{Binding Series}"
    LegendPosition="Left"><!-- mark -->
</lvc:CartesianChart>
<lvc:CartesianChart
    Series="{Binding Series}"
    LegendPosition="Right"><!-- mark -->
</lvc:CartesianChart>
<lvc:CartesianChart
    Series="{Binding Series}"
    LegendPosition="Hidden"><!-- mark -->
</lvc:CartesianChart>