fCraft.Noise.InterpolatedNoise C# (CSharp) Method

        public float InterpolatedNoise( float x, float y )
        {
            int xInt = ( int )Math.Floor( x );
            float xFloat = x - xInt;

            int yInt = ( int )Math.Floor( y );
            float yFloat = y - yInt;

            float p00, p01, p10, p11;

            switch ( InterpolationMode ) {
                case NoiseInterpolationMode.Linear:
                    p00 = StaticNoise( xInt, yInt );
                    p01 = StaticNoise( xInt, yInt + 1 );
                    p10 = StaticNoise( xInt + 1, yInt );
                    p11 = StaticNoise( xInt + 1, yInt + 1 );
                    return InterpolateLinear( InterpolateLinear( p00, p10, xFloat ), InterpolateLinear( p01, p11, xFloat ), yFloat );

                case NoiseInterpolationMode.Cosine:
                    p00 = StaticNoise( xInt, yInt );
                    p01 = StaticNoise( xInt, yInt + 1 );
                    p10 = StaticNoise( xInt + 1, yInt );
                    p11 = StaticNoise( xInt + 1, yInt + 1 );
                    return InterpolateCosine( InterpolateCosine( p00, p10, xFloat ), InterpolateCosine( p01, p11, xFloat ), yFloat );

                case NoiseInterpolationMode.Bicubic:
                    for ( int xOffset = -1; xOffset < 3; xOffset++ ) {
                        for ( int yOffset = -1; yOffset < 3; yOffset++ ) {
                            points[xOffset + 1, yOffset + 1] = StaticNoise( xInt + xOffset, yInt + yOffset );
                        }
                    }
                    p00 = InterpolateCubic( points[0, 0], points[1, 0], points[2, 0], points[3, 0], xFloat );
                    p01 = InterpolateCubic( points[0, 1], points[1, 1], points[2, 1], points[3, 1], xFloat );
                    p10 = InterpolateCubic( points[0, 2], points[1, 2], points[2, 2], points[3, 2], xFloat );
                    p11 = InterpolateCubic( points[0, 3], points[1, 3], points[2, 3], points[3, 3], xFloat );
                    return InterpolateCubic( p00, p01, p10, p11, yFloat );

                case NoiseInterpolationMode.Spline:
                    for ( int xOffset = -1; xOffset < 3; xOffset++ ) {
                        for ( int yOffset = -1; yOffset < 3; yOffset++ ) {
                            points[xOffset + 1, yOffset + 1] = StaticNoise( xInt + xOffset, yInt + yOffset );
                        }
                    }
                    p00 = InterpolateSpline( points[0, 0], points[1, 0], points[2, 0], points[3, 0], xFloat );
                    p01 = InterpolateSpline( points[0, 1], points[1, 1], points[2, 1], points[3, 1], xFloat );
                    p10 = InterpolateSpline( points[0, 2], points[1, 2], points[2, 2], points[3, 2], xFloat );
                    p11 = InterpolateSpline( points[0, 3], points[1, 3], points[2, 3], points[3, 3], xFloat );
                    return InterpolateSpline( p00, p01, p10, p11, yFloat );

                default:
                    throw new ArgumentException();
            }
        }