/*
 *	Karinto Library Project
 *
 *	This software is distributed under a zlib-style license.
 *	See license.txt for more information.
 */

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using Karinto;
using Karinto.Numeric;
using NUnit.Framework;

namespace KarintoTest
{
    [TestFixture]
    public class FftTest
    {

        [Test]
        public void Test()
        {
            Complex[] input = MakeComplexSample();
            Complex[] output = Fft.TransformForward(input);
        }

        [Test]
        public void RealToComplex()
        {
            double[] input = MakeRealSample();

            Fft r2c = new Fft(input.Length, Fft.Direction.Forward);

            Complex[] output; 
            r2c.Transform(input, out output);

        }

        private Complex[] MakeComplexSample()
        {
            Complex[] a = new Complex[64];
            for (int i = 0; i < 16; ++i)
            {
                a[i] = new Complex(i * 0.125, 0);
            }
            for (int i = 16; i < 48; ++i)
            {
                a[i] = new Complex(4.0 - i * 0.125, 0);
            }
            for (int i = 48; i < 64; ++i)
            {
                a[i] = new Complex(i * 0.125 - 8.0, 0);
            }
            return a;
        }

        private double[] MakeRealSample()
        {
            double[] a = new double[64];
            for (int i = 0; i < 16; ++i)
            {
                a[i] = i * 0.125;
            }
            for (int i = 16; i < 48; ++i)
            {
                a[i] = 4.0 - i * 0.125;
            }
            for (int i = 48; i < 64; ++i)
            {
                a[i] = i * 0.125 - 8.0;
            }
            return a;
        }
    }
}