public static class GoEaseQuartic
{
	public static float EaseIn( float t, float b, float c, float d )
	{
		return c * ( t /= d ) * t * t * t + b;
	}

	public static float EaseOut( float t, float b, float c, float d )
	{
		return -c * ( ( t = t / d - 1 ) * t * t * t - 1 ) + b;
	}

	public static float EaseInOut( 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;
	}
}