첨부 실행 코드는 나눔고딕코딩 폰트를 사용합니다.

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TestProject.zip
다운로드

▶ MainPage.xaml

<Page x:Class="TestProject.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
        <TextBlock Name="textBlock"
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            FontFamily="CooperBlack"
            FontSize="2"
            Text="HELLO">
            <TextBlock.Foreground>
                <LinearGradientBrush x:Name="textBlockForegroundBrush">
                    <GradientStop Offset="0.00" Color="Red"    />
                    <GradientStop Offset="0.14" Color="Orange" />
                    <GradientStop Offset="0.28" Color="Yellow" />
                    <GradientStop Offset="0.43" Color="Green"  />
                    <GradientStop Offset="0.57" Color="Blue"   />
                    <GradientStop Offset="0.71" Color="Indigo" />
                    <GradientStop Offset="0.86" Color="Violet" />
                    <GradientStop Offset="1.00" Color="Red"    />
                    <GradientStop Offset="1.14" Color="Orange" />
                    <GradientStop Offset="1.28" Color="Yellow" />
                    <GradientStop Offset="1.43" Color="Green"  />
                    <GradientStop Offset="1.57" Color="Blue"   />
                    <GradientStop Offset="1.71" Color="Indigo" />
                    <GradientStop Offset="1.86" Color="Violet" />
                    <GradientStop Offset="2.00" Color="Red"    />
                </LinearGradientBrush>
            </TextBlock.Foreground>
        </TextBlock>
    </Grid>
</Page>

 

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▶ MainPage.xaml.cs

using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Media;

namespace TestProject
{
    /// <summary>
    /// 메인 페이지
    /// </summary>
    public sealed partial class MainPage : Page
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region Field

        /// <summary>
        /// 텍스트 블럭 실제 높이
        /// </summary>
        private double textBlockActualHeight;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainPage()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainPage()
        {
            InitializeComponent();

            Loaded += Page_Loaded;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region 페이지 로드시 처리하기 - Page_Loaded(sender, e)

        /// <summary>
        /// 페이지 로드시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void Page_Loaded(object sender, RoutedEventArgs e)
        {
            this.textBlockActualHeight = this.textBlock.ActualHeight;

            CompositionTarget.Rendering += CompositionTarget_Rendering;
        }

        #endregion
        #region 구성 타겟 렌더링시 처리하기 - CompositionTarget_Rendering(sender, e)

        /// <summary>
        /// 구성 타겟 렌더링시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void CompositionTarget_Rendering(object sender, object e)
        {
            this.textBlock.FontSize = ActualHeight / textBlockActualHeight;

            RenderingEventArgs renderingEventArgs = e as RenderingEventArgs;

            double t = (0.25 * renderingEventArgs.RenderingTime.TotalSeconds) % 1;

            for(int index = 0; index < this.textBlockForegroundBrush.GradientStops.Count; index++)
            {
                this.textBlockForegroundBrush.GradientStops[index].Offset = index / 7.0 - t;  
            }
        }

        #endregion
    }
}
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