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72 lines
3.0 KiB
C#
72 lines
3.0 KiB
C#
// The CMLeonOS Project (https://github.com/Leonmmcoset/CMLeonOS)
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// Copyright (C) 2025-present LeonOS 2 Developer Team
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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using System;
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namespace CMLeonOS.UILib.Animations
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{
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/// <summary>
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/// Easing utilities for animations.
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/// </summary>
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internal static class Easing
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{
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/// <summary>
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/// Calculate the value of an easing function.
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/// </summary>
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/// <param name="t">The absolute progress of the animation, from 0 to 1.</param>
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/// <param name="type">The type of the easing function.</param>
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/// <param name="direction">The direction of the easing function.</param>
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/// <returns>The value of the easing function at the given progress.</returns>
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/// <exception cref="ArgumentOutOfRangeException">An exception is thrown if the progress is out of range.</exception>
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/// <exception cref="ArgumentException">An exception is thrown if the type or direction is ininvalid.</exception>
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internal static double Ease(double t, EasingType type, EasingDirection direction)
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{
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if (t < 0 || t > 1) throw new ArgumentOutOfRangeException();
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switch (type)
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{
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case EasingType.Linear:
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return t;
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case EasingType.Sine:
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switch (direction)
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{
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case EasingDirection.In:
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return 1 - Math.Cos(t * Math.PI / 2);
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case EasingDirection.Out:
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return Math.Sin(t * Math.PI / 2);
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case EasingDirection.InOut:
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return -0.5 * (Math.Cos(Math.PI * t) - 1);
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default:
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throw new ArgumentException("Unknown easing direction.");
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}
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default:
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throw new ArgumentException("Unknown easing type.");
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}
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}
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/// <summary>
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/// Linearly interpolate between two values.
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/// </summary>
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/// <param name="x">The first value.</param>
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/// <param name="y">The second value.</param>
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/// <param name="z">The value of the interpolation.</param>
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/// <returns>The interpolated value.</returns>
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internal static double Lerp(double x, double y, double z)
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{
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return x * (1 - z) + y * z;
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}
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}
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}
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