还要有一个坐标平移到中心的操作

//start

#include "drawarea.h"

#include <qDebug>

void show(cmat & src){

int hi = src.size();

//start

#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <vector>
#include <complex>
#include <cmath>

using namespace std;
const double PI = acos(-1.0);

typedef complex<double > cpl;
typedef vector<cpl > cline;
typedef vector<cline > cmat;
cmat init(int ,int);
cmat mk(int ,int);
void show(cmat & );
cmat dft2(cmat & );
cline dft(cline

//start

#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <vector>
#include <complex>
#include <cmath>
using namespace std;
typedef complex<double> cpl;
const double PI = acos(-1.0);
vector<cpl > dft(vector<cpl > vin);
vector<cpl > init(int);

void show(vector<cpl > & );
int main(){
//freopen("../../dat.in","r",stdin);