最小二乘法实现

#include <windows.h>
#include <stdio.h>
#include <math.h>
#include "COMMCTRL.H"
#define true TRUE
#define false FALSE
double Sigma[6];
static HFONT font;
static HWND mainHwnd;
static HDC mainHDC;
const char *szAppName="最小二乘法" ;
double x_value[]={36.9,46.7,63.7,77.8,84.0,87.5};
double y_value[]={181.0,197.0,235.0,270.0,283.0,292.0};

double det(double *A,int n)
{//|A| 矩阵A所有元素构成的行列式   
    double f=0.0f;
    double *B=(double*)malloc(sizeof(double)*(n-1)*(n-1));
    int i,j,k;
    if(n>2){
       for(j=0;j<n;j++){ 
          for(i=0;i<n;i++){
             if(i<j){
               for(k=0;k<n-1;k++){
                  B[k*(n-1)+i]=A[(k+1)*n+i];
               }
             }else if(i>j){
               for(k=0;k<n-1;k++){
                  B[k*(n-1)+i-1]=A[(k+1)*n+i];
               }
             }        
          }    
          if(j%2==1)f+=A[j]*det(B,n-1)*(-1);
          else      f+=A[j]*det(B,n-1); 
               
       }
          
    }
    else  f=A[0]*A[3]-A[1]*A[2];
  
    free(B);
    return f;
}

void one_variable_cubic(double *x,double *y,int n)
{
   int i,t;
   double X_pow[8]={0.0f};
   double *M=(double *)malloc(sizeof(double)*n);
   for(i=0;i<n;i++) {
   
   
   
   }
   free(M);
}
BOOL ShowSigma(HWND hwnd,double *value,int row,int col)
{  //有bug 只能拆开？？？  
   int i;
   char *s;
   for(i=0;i<col;i++){  
       s=(char*)calloc(12*sizeof(char));
       sprintf(s,"%.2f",value[i]);
       ListView_SetItemText(hwnd,row,i+1,s) ;
       free(s);
   }
}
BOOL ShowValue(HWND hwnd,double *value,int row,int col)
{ 
   int i;
   char *s;
   for(i=0;i<col;i++){  
       s=(char*)calloc(12*sizeof(char));
       sprintf(s,"%.2f",value[i]);
       ListView_SetItemText(hwnd,i,row,s) ;
       free(s);
   }
}
BOOL AddListViewItem(HWND hwnd,int row)
{
  LVITEM lvi;
  DWORD index;
  ZeroMemory(&lvi,sizeof(lvi));
  lvi.mask=LVIF_TEXT|LVIF_IMAGE|LVIF_PARAM|LVIF_STATE;
  lvi.state=0;
  lvi.stateMask=0;
  char *s;
  int length=sizeof(x_value)/sizeof(double);
  if(sizeof(y_value)/sizeof(double)!=length) {
      MessageBox(0,"x&y length is not equal","error",0);
      return false;
  }
  for(index=1;index<length+1;index++){
     s=(char*)calloc(10*sizeof(char));
     sprintf(s,"%d",index);
     lvi.iItem=index;
     lvi.iImage=0;
     lvi.iSubItem=row;
     lvi.pszText=s;//"undefine";
     lvi.cchTextMax=lstrlen(lvi.pszText) ;
     if(ListView_InsertItem(hwnd,&lvi)==-1)
        return false;
     free(s);
  }
  lvi.iItem=index;
  lvi.iImage=0;
  lvi.iSubItem=row;
  lvi.pszText="∑";
  lvi.cchTextMax=lstrlen(lvi.pszText) ;
  if(ListView_InsertItem(hwnd,&lvi)==-1)
       return false;
  return true;
}
void InitListViewColumns(HWND hwnd)
{
  char szText[256];
  LVCOLUMN lvc;
  DWORD i=0;
  lvc.mask=LVCF_FMT|LVCF_WIDTH|LVCF_TEXT|LVCF_SUBITEM;
  lvc.pszText=szText;
  lvc.cx=90;
  lvc.iImage=1;
  lvc.fmt=LVCF_FMT;
  char *s[]={" ","x","y","x^2","xy"}; 
  for(i=0;i<5;i++){
     lvc.pszText= s[i];//ColNames[i];
     lvc.iSubItem=i;
     ListView_InsertColumn(hwnd,i,&lvc);  
     free(s);
  }      
  if(!AddListViewItem(hwnd,0))
         MessageBox(0,"create listview failed","error",0); 
   ShowValue(hwnd,x_value,1,sizeof(x_value)/sizeof(double));
   ShowValue(hwnd,y_value,2,sizeof(x_value)/sizeof(double));
   mainHwnd=hwnd;
}
void double_mul(double *a,double *b,double *c,int len)
{
  int i;
  for(i=0;i<len;i++)c[i]=a[i]*b[i];
}
double Matrix(double *mat,int len,int a)
{ //y=ax+b,a=1计算a,a=0计算b;
    double ret,div;
    div=mat[2]*len-mat[0]*mat[0]+0.0001 ;
    if(a==1) ret=mat[3]*len-mat[0]*mat[1];
    else     ret=mat[2]*mat[1]-mat[0]*mat[3];
    ret=ret/div;
    return ret;
}
void fitting(double *sigma)
{     
      int i;
      int len=sizeof(x_value)/sizeof(double);      
      double *tmp=(double *)malloc(sizeof(double)*(len*2)); 
      double_mul(x_value,x_value,tmp,len);
      for(i=0;i<len;i++){
        sigma[0]+= x_value[i];
        sigma[1]+= y_value[i];
        sigma[2]+= tmp[i];
      }
      ShowValue(mainHwnd,tmp,3,len);
      double_mul(x_value,y_value,tmp,len);
      ShowValue(mainHwnd,tmp,4,len);
      for(i=0;i<len;i++)
            sigma[3]+= tmp[i];
      ShowSigma(mainHwnd,sigma,len,4);
      free(tmp);     
      sigma[4]=Matrix(sigma,len,1);
      sigma[5]=Matrix(sigma,len,0);      
}
void draw_piont(HDC hdc,int x,int y)
{
   int xLeft, yTop, xRight, yBottom;
   xLeft=x-3;
   xRight=x+3;
   yTop=y-3;
   yBottom=y+3;
   Ellipse (hdc, xLeft, yTop, xRight, yBottom) ;
}
void show_fit_line(HDC hdc,double *sigma)
{
   char s[32]={0};
   int x,y,i,len;
   double bx=0,by=0;
   HPEN pen=CreatePen(PS_SOLID,0,0X101010);
   HPEN bluepen=CreatePen(PS_SOLID,0,0Xff0000);
   HPEN redpen=CreatePen(PS_SOLID,0,0X0000ff);
   SetTextColor (hdc, 0x0000ff) ;
   SetBkColor (hdc, 0xf2f2f2) ;
   sprintf(s,"y=%.2fx+%.2f",sigma[4],sigma[5]);
   TextOut(hdc,640,360,s,strlen(s)) ;
     
   SelectObject(hdc,pen) ; 
   MoveToEx(hdc,620,300,NULL);
   LineTo(hdc,960,300) ;
   MoveToEx(hdc,620,300,NULL);
   LineTo(hdc,620,10) ; 
   
   
    
   SelectObject(hdc,bluepen) ;  
   len=sizeof(x_value)/sizeof(double);  
   for(i=0;i<len;i++){
     if(bx<x_value[i])bx=x_value[i]+0.001;
     if(by<y_value[i])by=y_value[i]+0.001;   
   }
   for(i=0;i<len;i++){
     x=(int)(x_value[i]*340/bx)+620;
     y=300-(int)(y_value[i]*290/by);     
     draw_piont(hdc,x,y);
   }   
   SelectObject(hdc,redpen) ; 
   POINT *porabi=(POINT*)malloc(1024*sizeof(POINT));   
   for(i=0;i<1024;i++){
     porabi[i].x=(int)(i*340/bx)+620;
     porabi[i].y=300-(int)((sigma[4]*i+ sigma[5])*290/by);   
   }   
   Polyline (hdc,porabi,1024);
   free(porabi);    
}       
void CreateButton(HWND hwnd,LPARAM lParam)
{
    static HWND hwndButton[3] ;
    hwndButton[0]=CreateWindow(TEXT("button"),"拟合",
              WS_CHILD|WS_VISIBLE|BS_FLAT,640,480,70,43,
              hwnd,(HMENU)0,((LPCREATESTRUCT)lParam)->hInstance,NULL);        
    hwndButton[1] =CreateWindow(WC_LISTVIEW,"dd",
             WS_CHILDWINDOW|WS_VISIBLE|LVS_REPORT|LVS_EDITLABELS,
             0,0,585,525,
            hwnd,(HMENU)1,((LPCREATESTRUCT)lParam)->hInstance,NULL);
    hwndButton[2]=CreateWindow(TEXT("button"),"一元三次",
              WS_CHILD|WS_VISIBLE|BS_FLAT,720,480,90,43,
              hwnd,(HMENU)2,((LPCREATESTRUCT)lParam)->hInstance,NULL); 
   InitListViewColumns(hwndButton[1]);
}
LRESULT CALLBACK SetChildFont(HWND hwnd, LPARAM lParam)
{
	SendMessage(hwnd,WM_SETFONT,(WPARAM)lParam,true);
	return true;
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
 int i;
 HDC hdc;
 PAINTSTRUCT ps;
 RECT  rect ,dataRect;
 static HANDLE hThread;
 static int flag=0;
 switch(message){
   case WM_CREATE:    
       CreateButton(hwnd,lParam);
       font=CreateFont(24,9,0,0,FW_NORMAL,false,false,
           0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,
           DEFAULT_QUALITY,DEFAULT_PITCH|FF_SWISS,"微软雅黑");
       EnumChildWindows(hwnd,SetChildFont,(LPARAM)font);  break;    
   case WM_PAINT :
        hdc = BeginPaint (hwnd, &ps) ;
        mainHDC=hdc;
        GetClientRect (hwnd, &rect) ;
        SelectObject(hdc,font) ;
        if(flag)show_fit_line(hdc,Sigma);
        ReleaseDC(hwnd, hdc);
        DeleteDC(hdc);
        EndPaint (hwnd, &ps) ;break; 
   case WM_DESTROY:
        exit(0);
   case   WM_COMMAND :   
        switch(LOWORD (wParam)){ //对应按钮执行的任务
          case 0:fitting(Sigma); 
                 flag=1;
                InvalidateRect(hwnd,NULL,true);break;
          default:break;
        }
 }
 return DefWindowProc(hwnd,message,wParam,lParam);
}
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,
                                   PSTR szCmdLine,int nCmdShow)
{
   HBRUSH brush=CreateSolidBrush(0xf2f2f2);
   HWND hwnd=NULL;
   HICON hicon;
   MSG msg;
   WNDCLASS wc;
   hicon=LoadIcon(hInstance,MAKEINTRESOURCE(101));
   ZeroMemory(&wc,sizeof wc);
   wc.hInstance     = hInstance;
   wc.lpszClassName = szAppName;
   wc.lpfnWndProc   = (WNDPROC)WndProc;
   wc.style         = CS_DBLCLKS|CS_VREDRAW|CS_HREDRAW;
   wc.hbrBackground = brush;//(HBRUSH)GetStockObject(WHITE_BRUSH);
   wc.hIcon         = hicon;
   wc.hCursor       = LoadCursor(NULL,IDC_ARROW);
   if (false==RegisterClass(&wc))return 0;
   hwnd = CreateWindow (szAppName,szAppName,
           WS_OVERLAPPEDWINDOW,500,100,1000,570,
           HWND_DESKTOP,NULL,hInstance,NULL);
   ShowWindow(hwnd,nCmdShow);UpdateWindow(hwnd); 
   while(GetMessage(&msg,NULL,0,0)>0){
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
   return msg.wParam;
}