WPF 文本滚动效果 渐变效果

 <DockPanel>
         <StackPanel DockPanel.Dock="Bottom" VerticalAlignment="Bottom"  ClipToBounds="True">
             <DockPanel Name="content1">
                 <DockPanel.RenderTransform>
                     <TranslateTransform Y="0" />
                 </DockPanel.RenderTransform>
                 <TextBlock Margin="-600,0,0,0" HorizontalAlignment="Right" FontSize="40" Foreground="Green" Text="其他患者请耐心等候" />
             </DockPanel>
             <StackPanel.Triggers>
                 <EventTrigger RoutedEvent="Loaded">
                     <BeginStoryboard>
                         <Storyboard>
                             <DoubleAnimation From="0" To="-1250" Duration="0:0:9"
                                         RepeatBehavior="Forever"
                                         Storyboard.TargetName="content1"
                                         Storyboard.TargetProperty="RenderTransform.X" />
                         </Storyboard>
                     </BeginStoryboard>
                 </EventTrigger>
             </StackPanel.Triggers>
         </StackPanel>
         <StackPanel DockPanel.Dock="Top">
             <TextBlock Text="123" Foreground="Black" FontSize="49" Name="PatientNameTb"></TextBlock>
             <StackPanel.Triggers>
                 <EventTrigger RoutedEvent="Loaded">
                     <BeginStoryboard>
                         <Storyboard ><!--可以试颜色变化，也可以是透明度变化-->
                             <!--<ColorAnimation BeginTime="00:00:00"
                                                         From="#3F5376" To="#FEE5D1"
                                                         Duration="00:00:01"
                                                         AutoReverse="True"
                                                         RepeatBehavior="Forever"
                                                         Storyboard.TargetName="PatientNameTb"
                                                         Storyboard.TargetProperty="Foreground.Color" />-->
                             <DoubleAnimation BeginTime="00:00:00"
                                                         From="0" To="1"
                                                         Duration="00:00:01"
                                                         AutoReverse="True"
                                                         RepeatBehavior="Forever"
                                                         Storyboard.TargetName="PatientNameTb"
                                                         Storyboard.TargetProperty="Opacity" />
                         </Storyboard>
                     </BeginStoryboard>
                 </EventTrigger>
             </StackPanel.Triggers>
         </StackPanel>
     </DockPanel>