refactor: animations easing

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Controls/LyricsCanvas.xaml.cs

@@ -63,6 +63,7 @@ namespace BetterLyrics.WinUI3.Controls
         );
         private readonly ValueTransition<double> _immersiveBgOpacityTransition = new(
             initialValue: 1f,
+            EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
             defaultTotalDuration: 0.3f
         );
         private readonly ValueTransition<Color> _accentColor1Transition = new(
@@ -87,13 +88,13 @@ namespace BetterLyrics.WinUI3.Controls
         );
         private readonly ValueTransition<double> _canvasYScrollTransition = new(
             initialValue: 0f,
-            defaultTotalDuration: 0.3f,
+            EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-            defaultEasingType: EasingType.EaseInOutSine
+            defaultTotalDuration: 0.3f
         );
         private readonly ValueTransition<double> _mouseYScrollTransition = new(
             initialValue: 0f,
-            defaultTotalDuration: 0.3f,
+            EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-            defaultEasingType: EasingType.EaseInOutSine
+            defaultTotalDuration: 0.3f
         );
 
         private TimeSpan _songPositionWithOffset;
@@ -492,7 +493,7 @@ namespace BetterLyrics.WinUI3.Controls
                 else
                 {
                     _canvasYScrollTransition.SetDurationMs(lyricsEffect.LyricsScrollDuration);
-                    _canvasYScrollTransition.SetEasingType(lyricsEffect.LyricsScrollEasingType);
+                    _canvasYScrollTransition.SetInterpolator(EasingHelper.GetInterpolatorByEasingType<double>(lyricsEffect.LyricsScrollEasingType, lyricsEffect.LyricsScrollEasingMode));
                     _canvasYScrollTransition.Start(_canvasTargetScrollOffset);
                 }
             }

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Controls/LyricsEffectSettingsControl.xaml

@@ -208,6 +208,13 @@
                             <ComboBoxItem x:Uid="SettingsPageEasingTypeEaseInOutBounce" />
                         </ComboBox>
                         <dev:SettingsExpander.Items>
+                            <dev:SettingsCard Header="Easing Mode">
+                                <ComboBox SelectedIndex="{x:Bind LyricsEffectSettings.LyricsScrollEasingMode, Mode=TwoWay, Converter={StaticResource EnumToIntConverter}}">
+                                    <ComboBoxItem Content="EaseIn" />
+                                    <ComboBoxItem Content="EaseOut" />
+                                    <ComboBoxItem Content="EaseInOut" />
+                                </ComboBox>
+                            </dev:SettingsCard>
                             <dev:SettingsCard x:Uid="SettingsPageScrollTopDuration">
                                 <local:ExtendedSlider
                                     Default="500"

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Enums/EaseMode.cs

@@ -0,0 +1,8 @@
+namespace BetterLyrics.WinUI3.Enums;
+
+public enum EaseMode
+{
+    In,
+    Out,
+    InOut,
+}

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Enums/EasingType.cs

@@ -6,15 +6,15 @@ namespace BetterLyrics.WinUI3.Enums
     {
         Linear,
         SmoothStep,
-        EaseInOutSine,
+        Sine,
-        EaseInOutQuad,
+        Quad,
-        EaseInOutCubic,
+        Cubic,
-        EaseInOutQuart,
+        Quart,
-        EaseInOutQuint,
+        Quint,
-        EaseInOutExpo,
+        Expo,
-        EaseInOutCirc,
+        Circle,
-        EaseInOutBack,
+        Back,
-        EaseInOutElastic,
+        Elastic,
-        EaseInOutBounce,
+        Bounce,
     }
 }

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Helper/EasingHelper.cs

@@ -1,114 +1,170 @@
 // 2025/6/23 by Zhe Fang
 
 using System;
+using System.Numerics;
+using BetterLyrics.WinUI3.Enums;
 
 namespace BetterLyrics.WinUI3.Helper
 {
     public class EasingHelper
     {
-        public static double EaseInOutSine(double t)
+        #region Interpolators
-        {
-            return -(Math.Cos(Math.PI * t) - 1f) / 2f;
-        }
-        public static double EaseInOutQuad(double t)
-        {
-            return t < 0.5f ? 2 * t * t : -1 + (4 - 2 * t) * t;
-        }
 
-        public static double EaseInOutCubic(double t)
+        public static Func<T, T, double, T> GetInterpolatorByEasingType<T>(EasingType? type, EaseMode easingMode = EaseMode.Out) 
+            where T : INumber<T>, IFloatingPointIeee754<T>
         {
-            return t < 0.5f ? 4 * t * t * t : 1 - Math.Pow(-2 * t + 2, 3) / 2;
+            return (start, end, progress) =>
-        }
-        public static double EaseInOutQuart(double t)
-        {
-            return t < 0.5f ? 8 * t * t * t * t : 1 - Math.Pow(-2 * t + 2, 4) / 2;
-        }
-
-        public static double EaseInOutQuint(double t)
-        {
-            return t < 0.5f ? 16 * t * t * t * t * t : 1 - Math.Pow(-2 * t + 2, 5) / 2;
-        }
-
-        public static double EaseInOutExpo(double t)
-        {
-            return t == 0
-              ? 0
-              : t == 1
-              ? 1
-              : t < 0.5 ? Math.Pow(2, 20 * t - 10) / 2
-              : (2 - Math.Pow(2, -20 * t + 10)) / 2;
-        }
-
-        public static double EaseInOutCirc(double t)
-        {
-            return t < 0.5f
-              ? (1 - Math.Sqrt(1 - Math.Pow(2 * t, 2))) / 2
-              : (Math.Sqrt(1 - Math.Pow(-2 * t + 2, 2)) + 1) / 2;
-        }
-
-        public static double EaseInOutBack(double t)
-        {
-            double c1 = 1.70158f;
-            double c2 = c1 * 1.525f;
-
-            return t < 0.5
-              ? (Math.Pow(2 * t, 2) * ((c2 + 1) * 2 * t - c2)) / 2
-              : (Math.Pow(2 * t - 2, 2) * ((c2 + 1) * (t * 2 - 2) + c2) + 2) / 2;
-        }
-
-        public static double EaseInOutElastic(double t)
-        {
-            if (t == 0 || t == 1) return t;
-            double p = 0.3f;
-            double s = p / 4;
-            return t < 0.5f
-              ? -(Math.Pow(2, 20 * t - 10) * Math.Sin((20 * t - 11.125f) * (2 * Math.PI) / p)) / 2
-              : (Math.Pow(2, -20 * t + 10) * Math.Sin((20 * t - 11.125f) * (2 * Math.PI) / p)) / 2 + 1;
-        }
-
-        private static double EaseOutBounce(double t)
-        {
-            if (t < 4 / 11f)
             {
-                return (121 * t * t) / 16f;
+                Func<T, T> easeInFunc = type switch
+                {
+                    EasingType.Sine => EaseInSine,
+                    EasingType.Quad => EaseInQuad,
+                    EasingType.Cubic => EaseInCubic,
+                    EasingType.Quart => EaseInQuart,
+                    EasingType.Quint => EaseInQuint,
+                    EasingType.Expo => EaseInExpo,
+                    EasingType.Circle => EaseInCircle,
+                    EasingType.Back => EaseInBack,
+                    EasingType.Elastic => EaseInElastic,
+                    EasingType.Bounce => EaseInBounce,
+                    EasingType.SmoothStep => SmoothStep,
+                    EasingType.Linear => Linear,
+                    _ => EaseInQuad,
+                };
+                double t = Ease(progress, easingMode, easeInFunc);
+                return start + ((end - start) * T.CreateChecked(t));
+            };
+        }
+
+        #endregion
+
+        public static double Ease<T>(double t, EaseMode mode, Func<T, T> easeIn)
+            where T : IFloatingPointIeee754<T>
+        {
+            t = Math.Clamp(t, 0.0, 1.0);
+
+            T tt = T.CreateChecked(t);
+            T half = T.CreateChecked(0.5);
+            T two = T.CreateChecked(2);
+            T tResult = mode switch
+            {
+                EaseMode.In => easeIn(tt),
+                EaseMode.Out => T.One - easeIn(T.One - tt),
+                EaseMode.InOut => tt < half
+                    ? easeIn(tt * two) / two
+                    : T.One - (easeIn((T.One - tt) * two) / two),
+                _ => easeIn(tt),
+            };
+
+            return double.CreateChecked(tResult);
+        }
+
+        public static T EaseInSine<T>(T t) where T : IFloatingPointIeee754<T>
+        {
+            return T.One - T.Cos((t * T.Pi) / T.CreateChecked(2));
+        }
+
+        public static T EaseInQuad<T>(T t) where T : INumber<T>
+        {
+            return t * t;
+        }
+
+        public static T EaseInCubic<T>(T t) where T : INumber<T>
+        {
+            return t * t * t;
+        }
+
+        public static T EaseInQuart<T>(T t) where T : INumber<T>
+        {
+            return t * t * t * t;
+        }
+
+        public static T EaseInQuint<T>(T t) where T : INumber<T>
+        {
+            return t * t * t * t * t;
+        }
+
+        public static T EaseInExpo<T>(T t) where T : IFloatingPointIeee754<T>
+        {
+            if (t == T.Zero)
+            {
+                return T.Zero;
             }
-            else if (t < 8 / 11f)
+
+            return T.Pow(T.CreateChecked(2), (T.CreateChecked(10) * t) - T.CreateChecked(10));
+        }
+
+        public static T EaseInCircle<T>(T t) where T : IFloatingPointIeee754<T>
+        {
+            return T.One - T.Sqrt(T.One - (t * t));
+        }
+
+        public static T EaseInBack<T>(T t) where T : IFloatingPointIeee754<T>
+        {
+            T c1 = T.CreateChecked(1.70158);
+            T c3 = c1 + T.One;
+
+            return (c3 * t * t * t) - (c1 * t * t);
+        }
+
+        public static T EaseInElastic<T>(T t) where T : IFloatingPointIeee754<T>
+        {
+            if (t == T.Zero || t == T.One)
             {
-                return (363 / 40f * t * t) - (99 / 10f * t) + 17 / 5f;
+                return t;
             }
-            else if (t < 9 / 10f)
+
+            const double springiness = 6;
+            const double oscillations = 1;
+
+            double td = double.CreateChecked(t);
+
+            double expo = (Math.Exp(springiness * td) - 1.0) / (Math.Exp(springiness) - 1.0);
+            double result = 0.7 * expo * Math.Sin((Math.PI * 2.0 * oscillations + (Math.PI * 0.5)) * td);
+
+            return T.CreateChecked(result);
+        }
+
+        private static T EaseOutBounce<T>(T t) where T : IFloatingPointIeee754<T>
+        {
+            if (t < T.CreateChecked(4.0 / 11.0))
             {
-                return (4356 / 361f * t * t) - (35442 / 1805f * t) + 16061 / 1805f;
+                return (T.CreateChecked(121) * t * t) / T.CreateChecked(16);
+            }
+            else if (t < T.CreateChecked(8.0 / 11.0))
+            {
+                return ((T.CreateChecked(363.0 / 40.0) * t * t) - (T.CreateChecked(99.0 / 10.0) * t)) + T.CreateChecked(17.0 / 5.0);
+            }
+            else if (t < T.CreateChecked(9.0 / 10.0))
+            {
+                return ((T.CreateChecked(4356.0 / 361.0) * t * t) - (T.CreateChecked(35442.0 / 1805.0) * t)) + T.CreateChecked(16061.0 / 1805.0);
             }
             else
             {
-                return (54 / 5f * t * t) - (513 / 25f * t) + 268 / 25f;
+                return ((T.CreateChecked(54.0 / 5.0) * t * t) - (T.CreateChecked(513.0 / 25.0) * t)) + T.CreateChecked(268.0 / 25.0);
             }
         }
 
-        public static double EaseInOutBounce(double t)
+        public static T EaseInBounce<T>(T t) where T : IFloatingPointIeee754<T>
         {
-            if (t < 0.5f)
+            return T.One - EaseOutBounce(T.One - t);
-            {
-                return (1 - EaseOutBounce(1 - 2 * t)) / 2;
-            }
-            else
-            {
-                return (1 + EaseOutBounce(2 * t - 1)) / 2;
-            }
         }
 
-        public static double SmoothStep(double t)
+        public static T SmoothStep<T>(T t) where T : IFloatingPointIeee754<T>
         {
-            return t * t * (3f - 2f * t);
+            return t * t * (T.CreateChecked(3) - (T.CreateChecked(2) * t));
         }
 
-        public static double CubicBezier(double t, double p0, double p1, double p2, double p3)
+        public static T CubicBezier<T>(T t, T p0, T p1, T p2, T p3) where T : IFloatingPointIeee754<T>
         {
-            double u = 1 - t;
+            T u = T.One - t;
-            return u * u * u * p0 + 3 * u * u * t * p1 + 3 * u * t * t * p2 + t * t * t * p3;
+
+            return (u * u * u * p0)
+                + (T.CreateChecked(3) * u * u * t * p1)
+                + (T.CreateChecked(3) * u * t * t * p2)
+                + (t * t * t * p3);
         }
 
-        public static double Linear(double t) => t;
+        public static T Linear<T>(T t) where T : INumber<T> => t;
     }
-}
+}

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Helper/ValueTransition.cs

@@ -2,6 +2,7 @@
 using BetterLyrics.WinUI3.Models;
 using System;
 using System.Collections.Generic;
+using static BetterLyrics.WinUI3.Helper.EasingHelper;
 
 namespace BetterLyrics.WinUI3.Helper
 {
@@ -21,7 +22,6 @@ namespace BetterLyrics.WinUI3.Helper
         private double _configuredDelaySeconds;    // 配置的延迟时长
 
         // 动画状态
-        private Enums.EasingType? _easingType;
         private Func<T, T, double, T> _interpolator;
         private bool _isTransitioning;
         private double _progress; // 当前段的进度 (0.0 ~ 1.0)
@@ -30,10 +30,11 @@ namespace BetterLyrics.WinUI3.Helper
         public T Value => _currentValue;
         public bool IsTransitioning => _isTransitioning;
         public T TargetValue => _targetValue; // 获取当前段的目标值
-        public Enums.EasingType? EasingType => _easingType;
         public double DurationSeconds => _totalDurationForAutoSplit;
 
-        public ValueTransition(T initialValue, double defaultTotalDuration = 0.3, EasingType? defaultEasingType = null, Func<T, T, double, T>? interpolator = null)
+        public Func<T, T, double, T> Interpolator => _interpolator;
+
+        public ValueTransition(T initialValue, Func<T, T, double, T>? interpolator, double defaultTotalDuration = 0.3)
         {
             _currentValue = initialValue;
             _startValue = initialValue;
@@ -43,15 +44,6 @@ namespace BetterLyrics.WinUI3.Helper
             if (interpolator != null)
             {
                 _interpolator = interpolator;
-                _easingType = null;
-            }
-            else if (defaultEasingType != null)
-            {
-                SetEasingType(defaultEasingType);
-            }
-            else
-            {
-                SetEasingType(Enums.EasingType.EaseInOutQuad);
             }
         }
 
@@ -74,10 +66,9 @@ namespace BetterLyrics.WinUI3.Helper
             _configuredDelaySeconds = seconds;
         }
 
-        public void SetEasingType(Enums.EasingType? easingType)
+        public void SetInterpolator(Func<T, T, double, T> interpolator)
         {
-            _easingType = easingType;
+            _interpolator = interpolator;
-            _interpolator = GetInterpolatorByEasingType(easingType);
         }
 
         #endregion
@@ -235,7 +226,7 @@ namespace BetterLyrics.WinUI3.Helper
 
         #region Interpolators
 
-        private Func<T, T, double, T> GetInterpolatorByEasingType(Enums.EasingType? type)
+        public static Func<T, T, double, T> GetInterpolatorByEasingType(EasingType? type, EaseMode easingMode)
         {
             if (typeof(T) == typeof(double))
             {
@@ -243,25 +234,24 @@ namespace BetterLyrics.WinUI3.Helper
                 {
                     double s = (double)(object)start;
                     double e = (double)(object)end;
-                    double t = progress;
 
-                    // 使用 EasingHelper (假设您的项目中已有此辅助类)
+                    Func<double, double> easeInFunc = type switch
-                    switch (type)
                     {
-                        case Enums.EasingType.EaseInOutSine: t = EasingHelper.EaseInOutSine(t); break;
+                        Enums.EasingType.Sine => EaseInSine,
-                        case Enums.EasingType.EaseInOutQuad: t = EasingHelper.EaseInOutQuad(t); break;
+                        Enums.EasingType.Quad => EaseInQuad,
-                        case Enums.EasingType.EaseInOutCubic: t = EasingHelper.EaseInOutCubic(t); break;
+                        Enums.EasingType.Cubic => EaseInCubic,
-                        case Enums.EasingType.EaseInOutQuart: t = EasingHelper.EaseInOutQuart(t); break;
+                        Enums.EasingType.Quart => EaseInQuart,
-                        case Enums.EasingType.EaseInOutQuint: t = EasingHelper.EaseInOutQuint(t); break;
+                        Enums.EasingType.Quint => EaseInQuint,
-                        case Enums.EasingType.EaseInOutExpo: t = EasingHelper.EaseInOutExpo(t); break;
+                        Enums.EasingType.Expo => EaseInExpo,
-                        case Enums.EasingType.EaseInOutCirc: t = EasingHelper.EaseInOutCirc(t); break;
+                        Enums.EasingType.Circle => EaseInCircle,
-                        case Enums.EasingType.EaseInOutBack: t = EasingHelper.EaseInOutBack(t); break;
+                        Enums.EasingType.Back => EaseInBack,
-                        case Enums.EasingType.EaseInOutElastic: t = EasingHelper.EaseInOutElastic(t); break;
+                        Enums.EasingType.Elastic => EaseInElastic,
-                        case Enums.EasingType.EaseInOutBounce: t = EasingHelper.EaseInOutBounce(t); break;
+                        Enums.EasingType.Bounce => EaseInBounce,
-                        case Enums.EasingType.SmoothStep: t = EasingHelper.SmoothStep(t); break;
+                        Enums.EasingType.SmoothStep => SmoothStep,
-                        case Enums.EasingType.Linear: t = EasingHelper.Linear(t); break;
+                        Enums.EasingType.Linear => Linear,
-                        default: t = EasingHelper.EaseInOutQuad(t); break;
+                        _ => EaseInQuad,
-                    }
+                    };
+                    double t = Ease(progress, easingMode, easeInFunc);
 
                     return (T)(object)(s + (e - s) * t);
                 };

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Logic/LyricsAnimator.cs

@@ -177,7 +177,7 @@ namespace BetterLyrics.WinUI3.Logic
                     line.ColorTransition.SetDelay(yScrollDelay);
                     line.ColorTransition.Start(isSecondaryLinePlaying ? fgColor : bgColor);
 
-                    line.AngleTransition.SetEasingType(canvasYScrollTransition.EasingType);
+                    line.AngleTransition.SetInterpolator(canvasYScrollTransition.Interpolator);
                     line.AngleTransition.SetDuration(yScrollDuration);
                     line.AngleTransition.SetDelay(yScrollDelay);
                     line.AngleTransition.Start(
@@ -185,7 +185,7 @@ namespace BetterLyrics.WinUI3.Logic
                         fanAngleRad * distanceFactor * (i > primaryPlayingLineIndex ? 1 : -1) :
                         0);
 
-                    line.YOffsetTransition.SetEasingType(canvasYScrollTransition.EasingType);
+                    line.YOffsetTransition.SetInterpolator(canvasYScrollTransition.Interpolator);
                     line.YOffsetTransition.SetDuration(yScrollDuration);
                     line.YOffsetTransition.SetDelay(yScrollDelay);
                     // 设计之初是当 isLayoutChanged 为真时 jumpTo

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Models/Lyrics/RenderLyricsChar.cs

@@ -20,18 +20,18 @@ namespace BetterLyrics.WinUI3.Models.Lyrics
         {
             ScaleTransition = new(
                 initialValue: 1.0,
-                defaultTotalDuration: Time.AnimationDuration.TotalSeconds,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: Time.AnimationDuration.TotalSeconds
             );
             GlowTransition = new(
                 initialValue: 0,
-                defaultTotalDuration: Time.AnimationDuration.TotalSeconds,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: Time.AnimationDuration.TotalSeconds
             );
             FloatTransition = new(
                 initialValue: 0,
-                defaultTotalDuration: Time.LongAnimationDuration.TotalSeconds,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: Time.LongAnimationDuration.TotalSeconds
             );
             LayoutRect = layoutRect;
         }

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Models/Lyrics/RenderLyricsLine.cs

@@ -82,43 +82,43 @@ namespace BetterLyrics.WinUI3.Models.Lyrics
         {
             AngleTransition = new(
                 initialValue: 0,
-                defaultTotalDuration: AnimationDuration,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: AnimationDuration
             );
             BlurAmountTransition = new(
                  initialValue: 0,
-                 defaultTotalDuration: AnimationDuration,
+                 EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                 defaultEasingType: EasingType.EaseInOutSine
+                 defaultTotalDuration: AnimationDuration
              );
             PhoneticOpacityTransition = new(
                 initialValue: 0,
-                defaultTotalDuration: AnimationDuration,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: AnimationDuration
             );
             PlayedOriginalOpacityTransition = new(
                 initialValue: 0,
-                defaultTotalDuration: AnimationDuration,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: AnimationDuration
             );
             UnplayedOriginalOpacityTransition = new(
                 initialValue: 0,
-                defaultTotalDuration: AnimationDuration,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: AnimationDuration
             );
             TranslatedOpacityTransition = new(
                 initialValue: 0,
-                defaultTotalDuration: AnimationDuration,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: AnimationDuration
             );
             ScaleTransition = new(
                 initialValue: 0,
-                defaultTotalDuration: AnimationDuration,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: AnimationDuration
             );
             YOffsetTransition = new(
                 initialValue: 0,
-                defaultTotalDuration: AnimationDuration,
+                EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Sine),
-                defaultEasingType: EasingType.EaseInOutSine
+                defaultTotalDuration: AnimationDuration
             );
             ColorTransition = new(
                 initialValue: Colors.Transparent,

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Models/Settings/LyricsEffectSettings.cs

@@ -1,6 +1,7 @@
 using BetterLyrics.WinUI3.Enums;
 using CommunityToolkit.Mvvm.ComponentModel;
 using System;
+using static BetterLyrics.WinUI3.Helper.EasingHelper;
 
 namespace BetterLyrics.WinUI3.Models.Settings
 {
@@ -29,6 +30,7 @@ namespace BetterLyrics.WinUI3.Models.Settings
         [ObservableProperty][NotifyPropertyChangedRecipients] public partial int LyricsFloatAnimationDuration { get; set; } = 450; // 450ms
 
         [ObservableProperty][NotifyPropertyChangedRecipients] public partial EasingType LyricsScrollEasingType { get; set; }
+        [ObservableProperty][NotifyPropertyChangedRecipients] public partial EaseMode LyricsScrollEasingMode { get; set; } = EaseMode.Out;
         [ObservableProperty][NotifyPropertyChangedRecipients] public partial int LyricsScrollDuration { get; set; }
         [ObservableProperty][NotifyPropertyChangedRecipients] public partial int LyricsScrollTopDuration { get; set; }
         [ObservableProperty][NotifyPropertyChangedRecipients] public partial int LyricsScrollBottomDuration { get; set; }
@@ -79,6 +81,7 @@ namespace BetterLyrics.WinUI3.Models.Settings
                 LyricsFloatAnimationDuration = this.LyricsFloatAnimationDuration,
 
                 LyricsScrollEasingType = this.LyricsScrollEasingType,
+                LyricsScrollEasingMode = this.LyricsScrollEasingMode,
                 LyricsScrollDuration = this.LyricsScrollDuration,
                 LyricsScrollTopDuration = this.LyricsScrollTopDuration,
                 LyricsScrollBottomDuration = this.LyricsScrollBottomDuration,

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Models/Settings/LyricsWindowStatus.cs

@@ -37,7 +37,7 @@ namespace BetterLyrics.WinUI3.Models.Settings
         [ObservableProperty] public partial Rect DemoMonitorBounds { get; set; }
         [ObservableProperty][NotifyPropertyChangedRecipients] public partial DockPlacement DockPlacement { get; set; } = DockPlacement.Top;
         [ObservableProperty] public partial LyricsStyleSettings LyricsStyleSettings { get; set; } = new();
-        [ObservableProperty] public partial LyricsEffectSettings LyricsEffectSettings { get; set; } = new(500, 500, 500, EasingType.EaseInOutQuad);
+        [ObservableProperty] public partial LyricsEffectSettings LyricsEffectSettings { get; set; } = new(500, 500, 500, EasingType.Quad);
         [ObservableProperty][NotifyPropertyChangedRecipients] public partial LyricsBackgroundSettings LyricsBackgroundSettings { get; set; } = new();
         [ObservableProperty][NotifyPropertyChangedRecipients] public partial AlbumArtAreaStyleSettings AlbumArtLayoutSettings { get; set; } = new();
         [ObservableProperty] public partial AlbumArtAreaEffectSettings AlbumArtAreaEffectSettings { get; set; } = new();

BetterLyrics.WinUI3/BetterLyrics.WinUI3/Renderer/CoverBackgroundRenderer.cs

@@ -58,7 +58,7 @@ namespace BetterLyrics.WinUI3.Renderer
 
         public CoverBackgroundRenderer()
         {
-            _crossfadeTransition = new ValueTransition<double>(1.0, 0.7, defaultEasingType: EasingType.Linear);
+            _crossfadeTransition = new ValueTransition<double>(1.0, EasingHelper.GetInterpolatorByEasingType<double>(EasingType.Linear), 0.7);
         }
 
         public void SetCoverBitmap(CanvasBitmap? newBitmap)