package net.minecraft.util;

public class Ease {
	public static float inBack(final float x) {
		float c1 = 1.70158F;
		float c3 = 2.70158F;
		return Mth.square(x) * (2.70158F * x - 1.70158F);
	}

	public static float inBounce(final float x) {
		return 1.0F - outBounce(1.0F - x);
	}

	public static float inCubic(final float x) {
		return Mth.cube(x);
	}

	public static float inElastic(final float x) {
		if (x == 0.0F) {
			return 0.0F;
		} else if (x == 1.0F) {
			return 1.0F;
		} else {
			float c4 = (float) (Math.PI * 2.0 / 3.0);
			return (float)(-Math.pow(2.0, 10.0 * x - 10.0) * Math.sin((x * 10.0 - 10.75) * (float) (Math.PI * 2.0 / 3.0)));
		}
	}

	public static float inExpo(final float x) {
		return x == 0.0F ? 0.0F : (float)Math.pow(2.0, 10.0 * x - 10.0);
	}

	public static float inQuart(final float x) {
		return Mth.square(Mth.square(x));
	}

	public static float inQuint(final float x) {
		return Mth.square(Mth.square(x)) * x;
	}

	public static float inSine(final float x) {
		return 1.0F - Mth.cos(x * (float) (Math.PI / 2));
	}

	public static float inOutBounce(final float x) {
		return x < 0.5F ? (1.0F - outBounce(1.0F - 2.0F * x)) / 2.0F : (1.0F + outBounce(2.0F * x - 1.0F)) / 2.0F;
	}

	public static float inOutCirc(final float x) {
		return x < 0.5F ? (float)((1.0 - Math.sqrt(1.0 - Math.pow(2.0 * x, 2.0))) / 2.0) : (float)((Math.sqrt(1.0 - Math.pow(-2.0 * x + 2.0, 2.0)) + 1.0) / 2.0);
	}

	public static float inOutCubic(final float x) {
		return x < 0.5F ? 4.0F * Mth.cube(x) : (float)(1.0 - Math.pow(-2.0 * x + 2.0, 3.0) / 2.0);
	}

	public static float inOutQuad(final float x) {
		return x < 0.5F ? 2.0F * Mth.square(x) : (float)(1.0 - Math.pow(-2.0 * x + 2.0, 2.0) / 2.0);
	}

	public static float inOutQuart(final float x) {
		return x < 0.5F ? 8.0F * Mth.square(Mth.square(x)) : (float)(1.0 - Math.pow(-2.0 * x + 2.0, 4.0) / 2.0);
	}

	public static float inOutQuint(final float x) {
		return x < 0.5 ? 16.0F * x * x * x * x * x : (float)(1.0 - Math.pow(-2.0 * x + 2.0, 5.0) / 2.0);
	}

	public static float outBounce(final float x) {
		float n1 = 7.5625F;
		float d1 = 2.75F;
		if (x < 0.36363637F) {
			return 7.5625F * Mth.square(x);
		} else if (x < 0.72727275F) {
			return 7.5625F * Mth.square(x - 0.54545456F) + 0.75F;
		} else {
			return x < 0.9090909090909091 ? 7.5625F * Mth.square(x - 0.8181818F) + 0.9375F : 7.5625F * Mth.square(x - 0.95454544F) + 0.984375F;
		}
	}

	public static float outElastic(final float x) {
		float c4 = (float) (Math.PI * 2.0 / 3.0);
		if (x == 0.0F) {
			return 0.0F;
		} else {
			return x == 1.0F ? 1.0F : (float)(Math.pow(2.0, -10.0 * x) * Math.sin((x * 10.0 - 0.75) * (float) (Math.PI * 2.0 / 3.0)) + 1.0);
		}
	}

	public static float outExpo(final float x) {
		return x == 1.0F ? 1.0F : 1.0F - (float)Math.pow(2.0, -10.0 * x);
	}

	public static float outQuad(final float x) {
		return 1.0F - Mth.square(1.0F - x);
	}

	public static float outQuint(final float x) {
		return 1.0F - (float)Math.pow(1.0 - x, 5.0);
	}

	public static float outSine(final float x) {
		return Mth.sin(x * (float) (Math.PI / 2));
	}

	public static float inOutSine(final float x) {
		return -(Mth.cos((float) Math.PI * x) - 1.0F) / 2.0F;
	}

	public static float outBack(final float x) {
		float c1 = 1.70158F;
		float c3 = 2.70158F;
		return 1.0F + 2.70158F * Mth.cube(x - 1.0F) + 1.70158F * Mth.square(x - 1.0F);
	}

	public static float outQuart(final float x) {
		return 1.0F - Mth.square(Mth.square(1.0F - x));
	}

	public static float outCubic(final float x) {
		return 1.0F - Mth.cube(1.0F - x);
	}

	public static float inOutExpo(final float x) {
		if (x < 0.5F) {
			return x == 0.0F ? 0.0F : (float)(Math.pow(2.0, 20.0 * x - 10.0) / 2.0);
		} else {
			return x == 1.0F ? 1.0F : (float)((2.0 - Math.pow(2.0, -20.0 * x + 10.0)) / 2.0);
		}
	}

	public static float inQuad(final float x) {
		return x * x;
	}

	public static float outCirc(final float x) {
		return (float)Math.sqrt(1.0F - Mth.square(x - 1.0F));
	}

	public static float inOutElastic(final float x) {
		float c5 = (float) Math.PI * 4.0F / 9.0F;
		if (x == 0.0F) {
			return 0.0F;
		} else if (x == 1.0F) {
			return 1.0F;
		} else {
			double sin = Math.sin((20.0 * x - 11.125) * (float) Math.PI * 4.0F / 9.0F);
			return x < 0.5F ? (float)(-(Math.pow(2.0, 20.0 * x - 10.0) * sin) / 2.0) : (float)(Math.pow(2.0, -20.0 * x + 10.0) * sin / 2.0 + 1.0);
		}
	}

	public static float inCirc(final float x) {
		return (float)(-Math.sqrt(1.0F - x * x)) + 1.0F;
	}

	public static float inOutBack(final float x) {
		float c1 = 1.70158F;
		float c2 = 2.5949094F;
		if (x < 0.5F) {
			return 4.0F * x * x * (7.189819F * x - 2.5949094F) / 2.0F;
		} else {
			float dt = 2.0F * x - 2.0F;
			return (dt * dt * (3.5949094F * dt + 2.5949094F) + 2.0F) / 2.0F;
		}
	}
}