Semi.Avalonia/demo/Semi.Avalonia.Demo/Pages/ColorPickerDemo.axaml

<UserControl
    x:Class="Semi.Avalonia.Demo.Pages.ColorPickerDemo"
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:colorPicker="clr-namespace:Semi.Avalonia.ColorPicker;assembly=Semi.Avalonia.ColorPicker"
    xmlns:controls="using:Avalonia.Controls"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    d:DesignHeight="450"
    d:DesignWidth="800"
    mc:Ignorable="d">
    <StackPanel Spacing="20">
        <StackPanel
            VerticalAlignment="Top"
            Orientation="Horizontal"
            Spacing="20">
            <ColorView ColorSpectrumShape="Ring" />
            <ColorView ColorSpectrumShape="Box" />
            <ColorView Palette="{DynamicResource SemiColorPalette}" />
        </StackPanel>
        <StackPanel HorizontalAlignment="Left" Orientation="Horizontal">
            <ColorPicker ColorSpectrumShape="Ring">
                <ColorPicker.Palette>
                    <controls:FlatHalfColorPalette />
                </ColorPicker.Palette>
            </ColorPicker>
            <ColorPicker ColorSpectrumShape="Box">
                <ColorPicker.Palette>
                    <colorPicker:SemiColorLightPalette />
                </ColorPicker.Palette>
            </ColorPicker>
            
            <ColorPicker ColorSpectrumShape="Box" Theme="{DynamicResource HexColorPicker}">
                <ColorPicker.Palette>
                    <colorPicker:SemiColorLightPalette />
                </ColorPicker.Palette>
            </ColorPicker>
        </StackPanel>
    </StackPanel>
</UserControl>