smart-bow-infrared/Assets/Game_Hyperspace/Spine/Runtime/spine-unity/Utility/MathUtilities.cs

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using UnityEngine;

namespace Spine.Unity {
	public static class MathUtilities {
		public static float InverseLerp (float a, float b, float value) {
			return (value - a) / (b - a);
		}

		/// <summary>
		/// Returns the linear interpolation ratio of <c>a</c> to <c>b</c> that <c>value</c> lies on.
		/// This is the t value that fulfills <c>value = lerp(a, b, t)</c>.
		/// </summary>
		public static Vector2 InverseLerp (Vector2 a, Vector2 b, Vector2 value) {
			return new Vector2(
				(value.x - a.x) / (b.x - a.x),
				(value.y - a.y) / (b.y - a.y));
		}

		/// <summary>
		/// Returns the linear interpolation ratio of <c>a</c> to <c>b</c> that <c>value</c> lies on.
		/// This is the t value that fulfills <c>value = lerp(a, b, t)</c>.
		/// </summary>
		public static Vector3 InverseLerp (Vector3 a, Vector3 b, Vector3 value) {
			return new Vector3(
				(value.x - a.x) / (b.x - a.x),
				(value.y - a.y) / (b.y - a.y),
				(value.z - a.z) / (b.z - a.z));
		}

		/// <summary>
		/// Returns the linear interpolation ratio of <c>a</c> to <c>b</c> that <c>value</c> lies on.
		/// This is the t value that fulfills <c>value = lerp(a, b, t)</c>.
		/// </summary>
		public static Vector4 InverseLerp (Vector4 a, Vector4 b, Vector4 value) {
			return new Vector4(
				(value.x - a.x) / (b.x - a.x),
				(value.y - a.y) / (b.y - a.y),
				(value.z - a.z) / (b.z - a.z),
				(value.w - a.w) / (b.w - a.w));
		}
	}
}