The hue bar can be created with a regular LinearGradientBrush
. The Level/Saturation panel can be done with a LinearGradientBrush
of the appropriate color along the X axis and another as an opacity mask along the Y, with the whole thing drawn against a black background.
<Window.Resources>
<!-- Change this to any pure hue i.e. no more than 2 rgb components set and at least 1 set to FF -->
<Color x:Key="CurrentColor">#00FF00</Color>
<LinearGradientBrush x:Key="HueBrush" StartPoint="0,0" EndPoint="0,1">
<LinearGradientBrush.GradientStops>
<GradientStop Color="#FF0000" Offset="0" />
<GradientStop Color="#FFFF00" Offset="0.167" />
<GradientStop Color="#00FF00" Offset="0.333" />
<GradientStop Color="#00FFFF" Offset="0.5" />
<GradientStop Color="#0000FF" Offset="0.667" />
<GradientStop Color="#FF00FF" Offset="0.833" />
<GradientStop Color="#FF0000" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
<VisualBrush x:Key="LevelSaturationBrush" TileMode="None">
<VisualBrush.Visual>
<Canvas Background="Black" Width="1" Height="1" SnapsToDevicePixels="True">
<Rectangle Width="1" Height="1" SnapsToDevicePixels="True">
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
<LinearGradientBrush.GradientStops>
<GradientStop Color="White" Offset="0" />
<GradientStop Color="{DynamicResource CurrentColor}" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Rectangle.Fill>
<Rectangle.OpacityMask>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<LinearGradientBrush.GradientStops>
<GradientStop Color="#FFFFFFFF" Offset="0"/>
<GradientStop Color="#00FFFFFF" Offset="1"/>
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</Rectangle.OpacityMask>
</Rectangle>
</Canvas>
</VisualBrush.Visual>
</VisualBrush>
</Window.Resources>
<StackPanel Orientation="Horizontal">
<Rectangle Fill="{StaticResource LevelSaturationBrush}" Width="200" Height="200" Margin="10" Stroke="Black" StrokeThickness="1" SnapsToDevicePixels="True" />
<Rectangle Fill="{StaticResource HueBrush}" Width="20" Height="200" Margin="10" Stroke="Black" StrokeThickness="1" SnapsToDevicePixels="True" />
</StackPanel>
Result:
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…