SHJX_GM/SHJX.Service.Library/CustomControl/Loading/Themes/DoubleArc.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:UI="clr-namespace:CustomUI"
                    xmlns:ec="http://schemas.microsoft.com/expression/2010/controls" 
                    xmlns:ed="http://schemas.microsoft.com/expression/2010/drawing">

    <ControlTemplate x:Key="DoubleArc"
                     TargetType="{x:Type UI:Loading}">
        <Grid x:Name="PART_Root" Background="{TemplateBinding Background}">
            <ed:Arc x:Name="PART_OutCircle" ArcThickness="5" ArcThicknessUnit="Pixel" EndAngle="360"
                    Fill="{TemplateBinding Foreground}"
                    Opacity="1" RenderTransformOrigin="0.5,0.5" StartAngle="90" Stretch="None">
                <ed:Arc.RenderTransform>
                    <RotateTransform />
                </ed:Arc.RenderTransform>
            </ed:Arc>
            <ed:Arc x:Name="PART_InnerCircle" Margin="5" ArcThickness="5" ArcThicknessUnit="Pixel"
                    EndAngle="150"
                    Fill="{TemplateBinding Foreground}"
                    Opacity="0.4" RenderTransformOrigin="0.5,0.5" StartAngle="-60" Stretch="None">
                <ed:Arc.RenderTransform>
                    <RotateTransform />
                </ed:Arc.RenderTransform>
            </ed:Arc>

            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="ActiveStates">
                    <VisualState x:Name="Inactive" />
                    <VisualState x:Name="Active">
                        <Storyboard SpeedRatio="{TemplateBinding SpeedRatio}">
                            <DoubleAnimationUsingKeyFrames RepeatBehavior="Forever" Storyboard.TargetName="PART_OutCircle" Storyboard.TargetProperty="(UIElement.RenderTransform).(RotateTransform.Angle)">
                                <LinearDoubleKeyFrame KeyTime="0:0:0.000" Value="0" />
                                <LinearDoubleKeyFrame KeyTime="0:0:3.000" Value="360" />
                            </DoubleAnimationUsingKeyFrames>
                            <DoubleAnimationUsingKeyFrames RepeatBehavior="Forever" Storyboard.TargetName="PART_InnerCircle" Storyboard.TargetProperty="(UIElement.RenderTransform).(RotateTransform.Angle)">
                                <LinearDoubleKeyFrame KeyTime="0:0:0.000" Value="0" />
                                <LinearDoubleKeyFrame KeyTime="0:0:3.000" Value="-360" />
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
        </Grid>
    </ControlTemplate>
</ResourceDictionary>