WPF LinearGradientBrush StartPoint EndPoint,RadientGradientBrush

<Window x:Class="WpfApp92.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp92"
        WindowState="Maximized"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Ellipse Grid.Column="0">
            <Ellipse.Fill>
                <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                    <GradientStop Offset="0.0" Color="Blue"/>
                    <GradientStop Offset="1.0" Color="Red"/>
                </LinearGradientBrush>
            </Ellipse.Fill>
        </Ellipse>
        <Ellipse Grid.Column="1">
            <Ellipse.Fill>
                <LinearGradientBrush StartPoint="0,1" EndPoint="0,0">
                    <GradientStop Offset="0.0" Color="Blue"/>
                    <GradientStop Offset="1.0" Color="Red"/>
                </LinearGradientBrush>
            </Ellipse.Fill>
        </Ellipse>
        <Ellipse Grid.Column="2">
            <Ellipse.Fill>
                <LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
                    <GradientStop Offset="0.0" Color="Blue"/>
                    <GradientStop Offset="1.0" Color="Red"/>
                </LinearGradientBrush>
            </Ellipse.Fill>
        </Ellipse>
        <Ellipse Grid.Column="3">
            <Ellipse.Fill>
                <LinearGradientBrush StartPoint="0.5,0" EndPoint="1,0">
                    <GradientStop Offset="0.0" Color="Blue"/>
                    <GradientStop Offset="1.0" Color="Red"/>
                </LinearGradientBrush>
            </Ellipse.Fill>
        </Ellipse>
        <Ellipse Grid.Column="4">
            <Ellipse.Fill>
                <LinearGradientBrush StartPoint="-2,2" EndPoint="2,2">
                    <GradientStop Offset="0.0" Color="Blue"/>
                    <GradientStop Offset="1.0" Color="Red"/>
                </LinearGradientBrush>
            </Ellipse.Fill>
        </Ellipse>
    </Grid>
</Window>

 

 

 

<Window x:Class="WpfApp92.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp92"
        WindowState="Maximized"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid> 
        <Ellipse>
            <Ellipse.Fill>
                <RadialGradientBrush>
                    <GradientStop Offset="0.0" Color="Purple"/>
                    <GradientStop Offset="0.2" Color="Cyan"/>
                    <GradientStop Offset="0.4" Color="Blue"/>
                    <GradientStop Offset="0.5" Color="Green"/>
                    <GradientStop Offset="0.6" Color="Yellow"/>
                    <GradientStop Offset="0.8" Color="Orange"/>
                    <GradientStop Offset="1.0" Color="Red"/>
                </RadialGradientBrush>
            </Ellipse.Fill>
        </Ellipse>         
    </Grid>
</Window>