using Unity.UIWidgets.foundation; using Unity.UIWidgets.ui; using UnityEngine; namespace Unity.UIWidgets.animation { public abstract class Curve { public abstract float transform(float t); public Curve flipped { get { return new FlippedCurve(this); } } public override string ToString() { return this.GetType().ToString(); } } class _Linear : Curve { public override float transform(float t) { return t; } } public class SawTooth : Curve { public SawTooth(int count) { this.count = count; } public readonly int count; public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0); if (t == 1.0f) { return 1.0f; } t *= this.count; return t - (int) t; } public override string ToString() { return $"{this.GetType()}({this.count})"; } } public class Interval : Curve { public Interval(float begin, float end, Curve curve = null) { this.begin = begin; this.end = end; this.curve = curve ?? Curves.linear; } public readonly float begin; public readonly float end; public readonly Curve curve; public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0); D.assert(this.begin >= 0.0); D.assert(this.begin <= 1.0); D.assert(this.end >= 0.0); D.assert(this.end <= 1.0); D.assert(this.end >= this.begin); if (t == 0.0 || t == 1.0) { return t; } t = ((t - this.begin) / (this.end - this.begin)).clamp(0.0f, 1.0f); if (t == 0.0 || t == 1.0) { return t; } return this.curve.transform(t); } public override string ToString() { if (!(this.curve is _Linear)) { return $"{this.GetType()}({this.begin}\u22EF{this.end}\u27A9{this.curve}"; } return $"{this.GetType()}({this.begin}\u22EF{this.end})"; } } public class Threshold : Curve { public Threshold(float threshold) { this.threshold = threshold; } public readonly float threshold; public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0); D.assert(this.threshold >= 0.0); D.assert(this.threshold <= 1.0); if (t == 0.0 || t == 1.0) { return t; } return t < this.threshold ? 0.0f : 1.0f; } } public class Cubic : Curve { public Cubic(float a, float b, float c, float d) { this.a = a; this.b = b; this.c = c; this.d = d; } public readonly float a; public readonly float b; public readonly float c; public readonly float d; const float _cubicErrorBound = 0.001f; float _evaluateCubic(float a, float b, float m) { return 3 * a * (1 - m) * (1 - m) * m + 3 * b * (1 - m) * m * m + m * m * m; } public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0); float start = 0.0f; float end = 1.0f; while (true) { float midpoint = (start + end) / 2; float estimate = this._evaluateCubic(this.a, this.c, midpoint); if ((t - estimate).abs() < _cubicErrorBound) { return this._evaluateCubic(this.b, this.d, midpoint); } if (estimate < t) { start = midpoint; } else { end = midpoint; } } } public override string ToString() { return $"{this.GetType()}({this.a:F2}, {this.b:F2}, {this.c:F2}, {this.d:F2})"; } } public class FlippedCurve : Curve { public FlippedCurve(Curve curve) { D.assert(curve != null); this.curve = curve; } public readonly Curve curve; public override float transform(float t) { return 1.0f - this.curve.transform(1.0f - t); } public override string ToString() { return $"{this.GetType()}({this.curve})"; } } class _DecelerateCurve : Curve { internal _DecelerateCurve() { } public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0); t = 1.0f - t; return 1.0f - t * t; } } class _BounceInCurve : Curve { internal _BounceInCurve() { } public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0); return 1.0f - Curves._bounce(1.0f - t); } } class _BounceOutCurve : Curve { internal _BounceOutCurve() { } public override float transform(float t) { D.assert(t >= 0.0f && t <= 1.0f); return Curves._bounce(t); } } class _BounceInOutCurve : Curve { internal _BounceInOutCurve() { } public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0f); if (t < 0.5f) { return (1.0f - Curves._bounce(1.0f - t)) * 0.5f; } else { return Curves._bounce(t * 2.0f - 1.0f) * 0.5f + 0.5f; } } } public class ElasticInCurve : Curve { public ElasticInCurve(float period = 0.4f) { this.period = period; } public readonly float period; public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0); float s = this.period / 4.0f; t = t - 1.0f; return -Mathf.Pow(2.0f, 10.0f * t) * Mathf.Sin((t - s) * (Mathf.PI * 2.0f) / this.period); } public override string ToString() { return $"{this.GetType()}({this.period})"; } } public class ElasticOutCurve : Curve { public ElasticOutCurve(float period = 0.4f) { this.period = period; } public readonly float period; public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0); float s = this.period / 4.0f; return Mathf.Pow(2.0f, -10.0f * t) * Mathf.Sin((t - s) * (Mathf.PI * 2.0f) / this.period) + 1.0f; } public override string ToString() { return $"{this.GetType()}({this.period})"; } } public class ElasticInOutCurve : Curve { public ElasticInOutCurve(float period = 0.4f) { this.period = period; } public readonly float period; public override float transform(float t) { D.assert(t >= 0.0 && t <= 1.0); float s = this.period / 4.0f; t = 2.0f * t - 1.0f; if (t < 0.0) { return -0.5f * Mathf.Pow(2.0f, 10.0f * t) * Mathf.Sin((t - s) * (Mathf.PI * 2.0f) / this.period); } else { return Mathf.Pow(2.0f, -10.0f * t) * Mathf.Sin((t - s) * (Mathf.PI * 2.0f) / this.period) * 0.5f + 1.0f; } } public override string ToString() { return $"{this.GetType()}({this.period})"; } } public static class Curves { public static readonly Curve linear = new _Linear(); public static readonly Curve decelerate = new _DecelerateCurve(); public static readonly Cubic fastLinearToSlowEaseIn = new Cubic(0.18f, 1.0f, 0.04f, 1.0f); public static readonly Curve ease = new Cubic(0.25f, 0.1f, 0.25f, 1.0f); public static readonly Curve easeIn = new Cubic(0.42f, 0.0f, 1.0f, 1.0f); public static readonly Cubic easeInToLinear = new Cubic(0.67f, 0.03f, 0.65f, 0.09f); public static readonly Cubic easeInSine = new Cubic(0.47f, 0, 0.745f, 0.715f); public static readonly Cubic easeInQuad = new Cubic(0.55f, 0.085f, 0.68f, 0.53f); public static readonly Cubic easeInCubic = new Cubic(0.55f, 0.055f, 0.675f, 0.19f); public static readonly Cubic easeInQuart = new Cubic(0.895f, 0.03f, 0.685f, 0.22f); public static readonly Cubic easeInQuint = new Cubic(0.755f, 0.05f, 0.855f, 0.06f); public static readonly Cubic easeInExpo = new Cubic(0.95f, 0.05f, 0.795f, 0.035f); public static readonly Cubic easeInCirc = new Cubic(0.6f, 0.04f, 0.98f, 0.335f); public static readonly Cubic easeInBack = new Cubic(0.6f, -0.28f, 0.735f, 0.045f); public static readonly Curve easeOut = new Cubic(0.0f, 0.0f, 0.58f, 1.0f); public static readonly Cubic linearToEaseOut = new Cubic(0.35f, 0.91f, 0.33f, 0.97f); public static readonly Cubic easeOutSine = new Cubic(0.39f, 0.575f, 0.565f, 1.0f); public static readonly Cubic easeOutQuad = new Cubic(0.25f, 0.46f, 0.45f, 0.94f); public static readonly Cubic easeOutCubic = new Cubic(0.215f, 0.61f, 0.355f, 1.0f); public static readonly Cubic easeOutQuart = new Cubic(0.165f, 0.84f, 0.44f, 1.0f); public static readonly Cubic easeOutQuint = new Cubic(0.23f, 1.0f, 0.32f, 1.0f); public static readonly Cubic easeOutExpo = new Cubic(0.19f, 1.0f, 0.22f, 1.0f); public static readonly Cubic easeOutCirc = new Cubic(0.075f, 0.82f, 0.165f, 1.0f); public static readonly Cubic easeOutBack = new Cubic(0.175f, 0.885f, 0.32f, 1.275f); public static readonly Curve easeInOut = new Cubic(0.42f, 0.0f, 0.58f, 1.0f); public static readonly Cubic easeInOutSine = new Cubic(0.445f, 0.05f, 0.55f, 0.95f); public static readonly Cubic easeInOutQuad = new Cubic(0.455f, 0.03f, 0.515f, 0.955f); public static readonly Cubic easeInOutCubic = new Cubic(0.645f, 0.045f, 0.355f, 1.0f); public static readonly Cubic easeInOutQuart = new Cubic(0.77f, 0, 0.175f, 1.0f); public static readonly Cubic easeInOutQuint = new Cubic(0.86f, 0, 0.07f, 1.0f); public static readonly Cubic easeInOutExpo = new Cubic(1.0f, 0, 0, 1.0f); public static readonly Cubic easeInOutCirc = new Cubic(0.785f, 0.135f, 0.15f, 0.86f); public static readonly Cubic easeInOutBack = new Cubic(0.68f, -0.55f, 0.265f, 1.55f); public static readonly Curve fastOutSlowIn = new Cubic(0.4f, 0.0f, 0.2f, 1.0f); public static readonly Curve bounceIn = new _BounceInCurve(); public static readonly Curve bounceOut = new _BounceOutCurve(); public static readonly Curve bounceInOut = new _BounceInOutCurve(); public static readonly Curve elasticIn = new ElasticInCurve(); public static readonly Curve elasticOut = new ElasticOutCurve(); public static readonly Curve elasticInOut = new ElasticInOutCurve(); internal static float _bounce(float t) { if (t < 1.0f / 2.75f) { return 7.5625f * t * t; } else if (t < 2 / 2.75f) { t -= 1.5f / 2.75f; return 7.5625f * t * t + 0.75f; } else if (t < 2.5f / 2.75f) { t -= 2.25f / 2.75f; return 7.5625f * t * t + 0.9375f; } t -= 2.625f / 2.75f; return 7.5625f * t * t + 0.984375f; } } }