[C#/WINUI3/.NET8] Compositor 클래스 : 화면 배경 브러시 애니메이션 만들기

■ Compositor 클래스를 사용해 화면 배경의 브러시 애니메이션을 만드는 방법을 보여준다.

※ 비주얼 스튜디오에서 TestProject(Unpackaged) 모드로 빌드한다.
※ TestProject.csproj 프로젝트 파일에서 WindowsPackageType 태그를 None으로 추가했다.

▶ MainPage.xaml


<?xml version="1.0" encoding="utf-8"?>
<Page x:Class="TestProject.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
    FontFamily="나눔고딕코딩"
    FontSize="16">
    <Grid Name="grid">
        <Ellipse
            HorizontalAlignment="Stretch"
            VerticalAlignment="Stretch"
            Margin="100"
            Fill="Gold" />
    </Grid>
</Page>

<?xml version="1.0" encoding="utf-8"?>

<Page x:Class="TestProject.MainPage"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"

FontFamily="나눔고딕코딩"

FontSize="16">

<Ellipse

HorizontalAlignment="Stretch"

VerticalAlignment="Stretch"

Margin="100"

Fill="Gold" />

</Grid>

</Page>

▶ MainPage.xaml.cs


using System;
using System.Numerics;

using Microsoft.UI;
using Microsoft.UI.Composition;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Hosting;

namespace TestProject;

/// <summary>
/// 메인 페이지
/// </summary>
public sealed partial class MainPage : Page
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Field
    ////////////////////////////////////////////////////////////////////////////////////////// Private

    #region Field

    /// <summary>
    /// 합성자
    /// </summary>
    private Compositor compositor;

    /// <summary>
    /// 스프라이트 비주얼
    /// </summary>
    private SpriteVisual spriteVisual;

    #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)
    {
        Visual mainPageVisual = ElementCompositionPreview.GetElementVisual(this.grid);

        this.compositor = mainPageVisual.Compositor;

        this.spriteVisual = this.compositor.CreateSpriteVisual();

        this.spriteVisual.Size = new Vector2((float)this.grid.ActualWidth, (float)this.grid.ActualHeight);

        ElementCompositionPreview.SetElementChildVisual(this.grid, this.spriteVisual);

        CompositionLinearGradientBrush compositionLinearGradientBrush = this.compositor.CreateLinearGradientBrush();

        compositionLinearGradientBrush.StartPoint = new Vector2(0, 0);
        compositionLinearGradientBrush.EndPoint   = new Vector2(1, 1);

        CompositionColorGradientStop compositionColorGradientStop1 = this.compositor.CreateColorGradientStop(0.0f, Colors.Transparent);
        CompositionColorGradientStop compositionColorGradientStop2 = this.compositor.CreateColorGradientStop(1.0f, Colors.Blue       );

        compositionLinearGradientBrush.ColorStops.Add(compositionColorGradientStop1);
        compositionLinearGradientBrush.ColorStops.Add(compositionColorGradientStop2);

        this.spriteVisual.Brush = compositionLinearGradientBrush;

        ScalarKeyFrameAnimation offsetScalarKeyFrameAnimation = this.compositor.CreateScalarKeyFrameAnimation();

        offsetScalarKeyFrameAnimation.InsertKeyFrame(0.0f, -1.0f);
        offsetScalarKeyFrameAnimation.InsertKeyFrame(1.0f,  1.0f);

        offsetScalarKeyFrameAnimation.IterationBehavior = AnimationIterationBehavior.Forever;
        offsetScalarKeyFrameAnimation.Duration          = TimeSpan.FromSeconds(1.5);

        compositionColorGradientStop1.StartAnimation("Offset", offsetScalarKeyFrameAnimation);
        compositionColorGradientStop2.StartAnimation("Offset", offsetScalarKeyFrameAnimation);
    }

    #endregion
}

100

101

using System;

using System.Numerics;

using Microsoft.UI;

using Microsoft.UI.Composition;

using Microsoft.UI.Xaml;

using Microsoft.UI.Xaml.Controls;

using Microsoft.UI.Xaml.Hosting;

namespace TestProject;

/// <summary>

/// 메인 페이지

/// </summary>

public sealed partial class MainPage : Page

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Field

////////////////////////////////////////////////////////////////////////////////////////// Private

#region Field

/// <summary>

/// 합성자

/// </summary>

private Compositor compositor;

/// <summary>

/// 스프라이트 비주얼

/// </summary>

private SpriteVisual spriteVisual;

#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)

{

Visual mainPageVisual = ElementCompositionPreview.GetElementVisual(this.grid);

this.compositor = mainPageVisual.Compositor;

this.spriteVisual = this.compositor.CreateSpriteVisual();

this.spriteVisual.Size = new Vector2((float)this.grid.ActualWidth, (float)this.grid.ActualHeight);

ElementCompositionPreview.SetElementChildVisual(this.grid, this.spriteVisual);

CompositionLinearGradientBrush compositionLinearGradientBrush = this.compositor.CreateLinearGradientBrush();

compositionLinearGradientBrush.StartPoint = new Vector2(0, 0);

compositionLinearGradientBrush.EndPoint = new Vector2(1, 1);

CompositionColorGradientStop compositionColorGradientStop1 = this.compositor.CreateColorGradientStop(0.0f, Colors.Transparent);

CompositionColorGradientStop compositionColorGradientStop2 = this.compositor.CreateColorGradientStop(1.0f, Colors.Blue );

compositionLinearGradientBrush.ColorStops.Add(compositionColorGradientStop1);

compositionLinearGradientBrush.ColorStops.Add(compositionColorGradientStop2);

this.spriteVisual.Brush = compositionLinearGradientBrush;

ScalarKeyFrameAnimation offsetScalarKeyFrameAnimation = this.compositor.CreateScalarKeyFrameAnimation();

offsetScalarKeyFrameAnimation.InsertKeyFrame(0.0f, -1.0f);

offsetScalarKeyFrameAnimation.InsertKeyFrame(1.0f, 1.0f);

offsetScalarKeyFrameAnimation.IterationBehavior = AnimationIterationBehavior.Forever;

offsetScalarKeyFrameAnimation.Duration = TimeSpan.FromSeconds(1.5);

compositionColorGradientStop1.StartAnimation("Offset", offsetScalarKeyFrameAnimation);

compositionColorGradientStop2.StartAnimation("Offset", offsetScalarKeyFrameAnimation);

}

#endregion

}

TestProject.zip