ArcScaleNeedlePresentation Class
Contains presentation settings for an arc scale needle.
Namespace: DevExpress.Xpf.Gauges
Assembly: DevExpress.Xpf.Gauges.v24.2.dll
NuGet Package: DevExpress.Wpf.Gauges
Declaration
Related API Members
The following members return ArcScaleNeedlePresentation objects:
Example
The following example illustrates a gauge that looks and behaves like a typical ‘knob’ element of a real-life dashboard. In this case we demonstrate how to create, for example, a realistic volume control.
To provide its appearance, we use custom templates for an arc scale’s needle and layer elements. For your convenience, these templates are stored in the KnobRestoreDictionary.xaml file, and named OscilloscopeNeedleTemplate and OscilloscopeScaleLayerTemplate. They can be easily re-used in your application.
This knob also provides the capability to interactively modify its value via mouse clicks. To enable this, the ValueIndicatorBase.IsInteractive property of a gauge’s needle is set to True to enable its interactivity.
Finally, below the knob-like gauge, there is a Label control, which is bound to the ValueIndicatorBase.Value property of a needle to display the current volume set by knob.
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<ControlTemplate x:Key="OscilloscopeNeedleTemplate">
<Grid RenderTransformOrigin="0, 0.5" Width="100" Height="100" Margin="-50,0,0,0">
<Ellipse Margin="6" Fill="Transparent"/>
<Grid x:Name="Needle" Margin="0">
<Ellipse Width="7" Height="7" Fill="#FF1B5D83" HorizontalAlignment="Right" Margin="0,0,15,0"/>
<Ellipse Width="5" Height="5" Fill="#FF3286AD" HorizontalAlignment="Right" Margin="0,0,16,0"/>
<Path Stretch="Fill" Fill="#FF1A2752"
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HorizontalAlignment="Center" Height="85" Margin="0" VerticalAlignment="Center" Width="85" Opacity="0.35"/>
</Grid>
</Grid>
</ControlTemplate>
<ControlTemplate x:Key="OscilloscopeScaleLayerTemplate">
<Grid RenderTransformOrigin="0.5, 0.5" Width="100" Height="100">
<Ellipse Fill="White" Margin="0,1,0,-1" Opacity="0.9"/>
<Ellipse Fill="#FFAEB3BE" Margin="0,0,0,1"/>
<Ellipse Grid.Column="1" Margin="0,1,0,0">
<Ellipse.Fill>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFCBCFD5" Offset="0"/>
<GradientStop Color="#FFF5F6F7" Offset="1"/>
</LinearGradientBrush>
</Ellipse.Fill>
</Ellipse>
<Path Stretch="Fill" Data="F1 M 798,507C 798,540.137 784.121,567 767,567C 749.879,567 736,540.137 736,507L 798,507 Z "
HorizontalAlignment="Center" Height="56.5" Margin="0,0,0,-18.5" VerticalAlignment="Bottom" Width="64">
<Path.Fill>
<RadialGradientBrush Center="0.5,0.002" GradientOrigin="0.5,0.002" RadiusY="0.688" RadiusX="0.533">
<GradientStop Color="#FF2D344B" Offset="0"/>
<GradientStop Color="#002D344B" Offset="1"/>
<GradientStop Color="#CC2D344B" Offset="0.8"/>
</RadialGradientBrush>
</Path.Fill>
</Path>
<Ellipse Margin="6">
<Ellipse.Fill>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFBCC0CA" Offset="0"/>
<GradientStop Color="#FF5C6378" Offset="1"/>
</LinearGradientBrush>
</Ellipse.Fill>
</Ellipse>
<Ellipse Margin="7">
<Ellipse.Fill>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFFAFAFC" Offset="0"/>
<GradientStop Color="#FF9499AB" Offset="1"/>
</LinearGradientBrush>
</Ellipse.Fill>
</Ellipse>
<Ellipse Margin="10" Fill="White"/>
<Ellipse Margin="10,11,10,10">
<Ellipse.Fill>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFE9EBEE" Offset="0"/>
<GradientStop Color="#FFCFD4DA" Offset="1"/>
</LinearGradientBrush>
</Ellipse.Fill>
</Ellipse>
</Grid>
</ControlTemplate>
</ResourceDictionary>
Inheritance
See Also