# 实用动画曲线集

2015-10-14 14:00:04来源:http://ty-m.com/blog/2015/10/12/实用动画曲线集/作者:人点击

Unity的NGUI动画组件 —— UITweener提供了重要的设计思想，即使用统一的自变量Sample逻辑，导出因变量供不同的插值动画使用，无论是Position，Scale，Rotation变换，都使用唯一的factor进行运算。

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public enum Method{Linear,EaseIn,EaseOut,EaseInOut,BounceIn,BounceOut,}

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public enum Method{Linear, EaseIn,EaseOut,EaseInOut,BounceIn,BounceOut, QuadEaseOut, QuadEaseIn, QuadEaseInOut, QuadEaseOutIn, ExpoEaseOut, ExpoEaseIn, ExpoEaseInOut, ExpoEaseOutIn, CubicEaseOut, CubicEaseIn, CubicEaseInOut, CubicEaseOutIn, QuartEaseOut, QuartEaseIn, QuartEaseInOut, QuartEaseOutIn, QuintEaseOut, QuintEaseIn, QuintEaseInOut, QuintEaseOutIn, CircEaseOut, CircEaseIn, CircEaseInOut, CircEaseOutIn, SineEaseOut, SineEaseIn, SineEaseInOut, SineEaseOutIn, ElasticEaseOut, ElasticEaseIn, ElasticEaseInOut, ElasticEaseOutIn, BounceEaseOut, BounceEaseIn, BounceEaseInOut, BounceEaseOutIn, BackEaseOut, BackEaseIn, BackEaseInOut, BackEaseOutIn}

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public class EasingFuntionUtility{/* EASING FUNCTIONS */#region Linear/// <summary>/// Easing equation function for a simple linear tweening, with no easing./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float Linear(float t, float b, float c, float d){return c * t / d + b;}#endregion#region Expo/// <summary>/// Easing equation function for an exponential (2^t) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float ExpoEaseOut(float t, float b, float c, float d){return (t == d) ? b + c : c * (-Mathf.Pow(2, -10 * t / d) + 1) + b;}/// <summary>/// Easing equation function for an exponential (2^t) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float ExpoEaseIn(float t, float b, float c, float d){return (t == 0) ? b : c * Mathf.Pow(2, 10 * (t / d - 1)) + b;}/// <summary>/// Easing equation function for an exponential (2^t) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float ExpoEaseInOut(float t, float b, float c, float d){if (t == 0)return b;if (t == d)return b + c;if ((t /= d / 2) < 1)return c / 2 * Mathf.Pow(2, 10 * (t - 1)) + b;return c / 2 * (-Mathf.Pow(2, -10 * --t) + 2) + b;}/// <summary>/// Easing equation function for an exponential (2^t) easing out/in: /// deceleration until halfway, then acceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float ExpoEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return ExpoEaseOut(t * 2, b, c / 2, d);return ExpoEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion#region Circular/// <summary>/// Easing equation function for a circular (sqrt(1-t^2)) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float CircEaseOut(float t, float b, float c, float d){return c * Mathf.Sqrt(1 - (t = t / d - 1) * t) + b;}/// <summary>/// Easing equation function for a circular (sqrt(1-t^2)) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float CircEaseIn(float t, float b, float c, float d){return -c * (Mathf.Sqrt(1 - (t /= d) * t) - 1) + b;}/// <summary>/// Easing equation function for a circular (sqrt(1-t^2)) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float CircEaseInOut(float t, float b, float c, float d){if ((t /= d / 2) < 1)return -c / 2 * (Mathf.Sqrt(1 - t * t) - 1) + b;return c / 2 * (Mathf.Sqrt(1 - (t -= 2) * t) + 1) + b;}/// <summary>/// Easing equation function for a circular (sqrt(1-t^2)) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float CircEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return CircEaseOut(t * 2, b, c / 2, d);return CircEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion#region Quad/// <summary>/// Easing equation function for a quadratic (t^2) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuadEaseOut(float t, float b, float c, float d){return -c * (t /= d) * (t - 2) + b;}/// <summary>/// Easing equation function for a quadratic (t^2) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuadEaseIn(float t, float b, float c, float d){return c * (t /= d) * t + b;}/// <summary>/// Easing equation function for a quadratic (t^2) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuadEaseInOut(float t, float b, float c, float d){if ((t /= d / 2) < 1)return c / 2 * t * t + b;return -c / 2 * ((--t) * (t - 2) - 1) + b;}/// <summary>/// Easing equation function for a quadratic (t^2) easing out/in: /// deceleration until halfway, then acceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuadEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return QuadEaseOut(t * 2, b, c / 2, d);return QuadEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion#region Sine/// <summary>/// Easing equation function for a sinusoidal (sin(t)) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float SineEaseOut(float t, float b, float c, float d){return c * Mathf.Sin(t / d * (Mathf.PI / 2)) + b;}/// <summary>/// Easing equation function for a sinusoidal (sin(t)) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float SineEaseIn(float t, float b, float c, float d){return -c * Mathf.Cos(t / d * (Mathf.PI / 2)) + c + b;}/// <summary>/// Easing equation function for a sinusoidal (sin(t)) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float SineEaseInOut(float t, float b, float c, float d){if ((t /= d / 2) < 1)return c / 2 * (Mathf.Sin(Mathf.PI * t / 2)) + b;return -c / 2 * (Mathf.Cos(Mathf.PI * --t / 2) - 2) + b;}/// <summary>/// Easing equation function for a sinusoidal (sin(t)) easing in/out: /// deceleration until halfway, then acceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float SineEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return SineEaseOut(t * 2, b, c / 2, d);return SineEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion#region Cubic/// <summary>/// Easing equation function for a cubic (t^3) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float CubicEaseOut(float t, float b, float c, float d){return c * ((t = t / d - 1) * t * t + 1) + b;}/// <summary>/// Easing equation function for a cubic (t^3) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float CubicEaseIn(float t, float b, float c, float d){return c * (t /= d) * t * t + b;}/// <summary>/// Easing equation function for a cubic (t^3) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float CubicEaseInOut(float t, float b, float c, float d){if ((t /= d / 2) < 1)return c / 2 * t * t * t + b;return c / 2 * ((t -= 2) * t * t + 2) + b;}/// <summary>/// Easing equation function for a cubic (t^3) easing out/in: /// deceleration until halfway, then acceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float CubicEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return CubicEaseOut(t * 2, b, c / 2, d);return CubicEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion#region Quartic/// <summary>/// Easing equation function for a quartic (t^4) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuartEaseOut(float t, float b, float c, float d){return -c * ((t = t / d - 1) * t * t * t - 1) + b;}/// <summary>/// Easing equation function for a quartic (t^4) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuartEaseIn(float t, float b, float c, float d){return c * (t /= d) * t * t * t + b;}/// <summary>/// Easing equation function for a quartic (t^4) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuartEaseInOut(float t, float b, float c, float d){if ((t /= d / 2) < 1)return c / 2 * t * t * t * t + b;return -c / 2 * ((t -= 2) * t * t * t - 2) + b;}/// <summary>/// Easing equation function for a quartic (t^4) easing out/in: /// deceleration until halfway, then acceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuartEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return QuartEaseOut(t * 2, b, c / 2, d);return QuartEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion#region Quintic/// <summary>/// Easing equation function for a quintic (t^5) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuintEaseOut(float t, float b, float c, float d){return c * ((t = t / d - 1) * t * t * t * t + 1) + b;}/// <summary>/// Easing equation function for a quintic (t^5) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuintEaseIn(float t, float b, float c, float d){return c * (t /= d) * t * t * t * t + b;}/// <summary>/// Easing equation function for a quintic (t^5) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuintEaseInOut(float t, float b, float c, float d){if ((t /= d / 2) < 1)return c / 2 * t * t * t * t * t + b;return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;}/// <summary>/// Easing equation function for a quintic (t^5) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float QuintEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return QuintEaseOut(t * 2, b, c / 2, d);return QuintEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion#region Elastic/// <summary>/// Easing equation function for an elastic (exponentially decaying sine wave) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float ElasticEaseOut(float t, float b, float c, float d){if ((t /= d) == 1)return b + c;float p = d * 0.3f;float s = p / 4;return (c * Mathf.Pow(2, -10 * t) * Mathf.Sin((t * d - s) * (2 * Mathf.PI) / p) + c + b);}/// <summary>/// Easing equation function for an elastic (exponentially decaying sine wave) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float ElasticEaseIn(float t, float b, float c, float d){if ((t /= d) == 1)return b + c;float p = d * 0.3f;float s = p / 4;return -(c * Mathf.Pow(2, 10 * (t -= 1)) * Mathf.Sin((t * d - s) * (2 * Mathf.PI) / p)) + b;}/// <summary>/// Easing equation function for an elastic (exponentially decaying sine wave) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float ElasticEaseInOut(float t, float b, float c, float d){if ((t /= d / 2f) == 2)return b + c;float p = d * (0.3f * 1.5f);float s = p / 4;if (t < 1)return -0.5f * (c * Mathf.Pow(2, 10 * (t -= 1)) * Mathf.Sin((t * d - s) * (2 * Mathf.PI) / p)) + b;return c * Mathf.Pow(2, -10 * (t -= 1)) * Mathf.Sin((t * d - s) * (2 * Mathf.PI) / p) * 0.5f + c + b;}/// <summary>/// Easing equation function for an elastic (exponentially decaying sine wave) easing out/in: /// deceleration until halfway, then acceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float ElasticEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return ElasticEaseOut(t * 2, b, c / 2, d);return ElasticEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion#region Bounce/// <summary>/// Easing equation function for a bounce (exponentially decaying parabolic bounce) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float BounceEaseOut(float t, float b, float c, float d){if ((t /= d) < (1 / 2.75f))return c * (7.5625f * t * t) + b;else if (t < (2 / 2.75f))return c * (7.5625f * (t -= (1.5f / 2.75f)) * t + 0.75f) + b;else if (t < (2.5f / 2.75f))return c * (7.5625f * (t -= (2.25f / 2.75f)) * t + 0.9375f) + b;elsereturn c * (7.5625f * (t -= (2.625f / 2.75f)) * t + .984375f) + b;}/// <summary>/// Easing equation function for a bounce (exponentially decaying parabolic bounce) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float BounceEaseIn(float t, float b, float c, float d){return c - BounceEaseOut(d - t, 0, c, d) + b;}/// <summary>/// Easing equation function for a bounce (exponentially decaying parabolic bounce) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float BounceEaseInOut(float t, float b, float c, float d){if (t < d / 2)return BounceEaseIn(t * 2, 0, c, d) * 0.5f + b;elsereturn BounceEaseOut(t * 2 - d, 0, c, d) * 0.5f + c * 0.5f + b;}/// <summary>/// Easing equation function for a bounce (exponentially decaying parabolic bounce) easing out/in: /// deceleration until halfway, then acceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float BounceEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return BounceEaseOut(t * 2, b, c / 2, d);return BounceEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion#region Back/// <summary>/// Easing equation function for a back (overshooting cubic easing: (s+1)*t^3 - s*t^2) easing out: /// decelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float BackEaseOut(float t, float b, float c, float d){return c * ((t = t / d - 1) * t * ((1.70158f + 1) * t + 1.70158f) + 1) + b;}/// <summary>/// Easing equation function for a back (overshooting cubic easing: (s+1)*t^3 - s*t^2) easing in: /// accelerating from zero velocity./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float BackEaseIn(float t, float b, float c, float d){return c * (t /= d) * t * ((1.70158f + 1) * t - 1.70158f) + b;}/// <summary>/// Easing equation function for a back (overshooting cubic easing: (s+1)*t^3 - s*t^2) easing in/out: /// acceleration until halfway, then deceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float BackEaseInOut(float t, float b, float c, float d){float s = 1.70158f;if ((t /= d / 2) < 1)return c / 2 * (t * t * (((s *= (1.525f)) + 1) * t - s)) + b;return c / 2 * ((t -= 2) * t * (((s *= (1.525f)) + 1) * t + s) + 2) + b;}/// <summary>/// Easing equation function for a back (overshooting cubic easing: (s+1)*t^3 - s*t^2) easing out/in: /// deceleration until halfway, then acceleration./// </summary>/// <param name="t">Current time in seconds.</param>/// <param name="b">Starting value.</param>/// <param name="c">Final value.</param>/// <param name="d">Duration of animation.</param>/// <returns>The correct value.</returns>public static float BackEaseOutIn(float t, float b, float c, float d){if (t < d / 2)return BackEaseOut(t * 2, b, c / 2, d);return BackEaseIn((t * 2) - d, b + c / 2, c / 2, d);}#endregion}