#include <windows.h> #include<math.h> //函数声明 BOOL InitWindow( HINSTANCE hInstance, int nCmdShow ); LRESULT CALLBACK WinProc( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam ); //变量说明 HWND hWnd; //窗口句柄 HINSTANCE hInstance; //产生[0，1]上均匀随机数 double rander() { double temp; temp=(double)( abs(rand())%9*0.1 +abs(rand())%9*0.01 +abs(rand())%9*0.001 +abs(rand())%9*0.0001); return temp; } //正态分布函数 void guass(int r[3]) { double v1,v2,s,w; do{ v1=rander(); v2=rander(); s=v1*v1+v2*v2; }while(s>=1.0); w=sqrt(-2.0*log(s)/s); r[1]=(int)(v1*w*20.0); r[2]=(int)(v2*w*20.0); } //Voronoi 函数 int voronoi(int x0,int y0,int r[3],HDC hdc) { int x1=0,y1=0,x2=0,y2=0; int times=0; SetViewportOrgEx(hdc,300+x1,300+y1,NULL); guass(r); x1=(int)(-x0+sqrt(3)*y0*r[1]/(2*sqrt(x0*x0+y0*y0))); y1=(int)(-r[1]*sqrt(x0*x0+y0*y0)/(2*y0)-x0*x1/y0); MoveToEx(hdc,0,0,NULL); LineTo(hdc,x1,y1); x2=(int)(-x0-sqrt(3)*y0*r[2]/(2*sqrt(x0*x0+y0*y0))); y2=(int)(-r[2]*sqrt(x0*x0+y0*y0)/(2*y0)-x0*x1/y0); MoveToEx(hdc,0,0,NULL); LineTo(hdc,x1,y1); x0=x1;y0=y1; times++; if(times>=32) return 0; voronoi(x0,y0,r,hdc); } //************************************************************ //函数：WinMain( ) //功能：Windows程序入口函数。创建主窗口，处理消息循环 //************************************************************ int PASCAL WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { if ( !InitWindow( hInstance, nCmdShow ) ) return FALSE; //创建主窗口 //如果创建不成功则返回FALSE并同时退出程序 hInstance=hInstance; MSG msg; //进入消息循环： for(;;) { if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { if ( msg.message==WM_QUIT) break; TranslateMessage(&msg); DispatchMessage(&msg); } } return msg.wParam; } //************************************************************ //函数：InitWindow( ) //功能：创建窗口 //************************************************************ static BOOL InitWindow( HINSTANCE hInstance, int nCmdShow ) { //定义窗口风格： WNDCLASS wc; wc.style = NULL; wc.lpfnWndProc = (WNDPROC)WinProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hInstance; wc.hIcon = NULL; wc.hCursor = NULL; wc.hbrBackground = CreateSolidBrush (RGB(255, 255, 255)); //背景 wc.lpszMenuName = NULL; wc.lpszClassName = "Run"; RegisterClass(&wc);//注册窗口 //按所给参数创造窗口 hWnd = CreateWindow("Run", "Run", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL,NULL,hInstance,NULL); if( !hWnd ) return FALSE; ShowWindow(hWnd,nCmdShow);//显示窗口 UpdateWindow(hWnd);//刷新窗口 return TRUE; } //************************************************************ //函数：WinProc( ) //功能：处理窗口消息 //************************************************************ LRESULT CALLBACK WinProc( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { HPEN hpen; PAINTSTRUCT ps; HDC hdc; int R[3]; switch(message) { case WM_PAINT: hdc=BeginPaint(hWnd,&ps); SetMapMode(hdc,MM_ANISOTROPIC); SetWindowExtEx(hdc,800,800,NULL); SetViewportExtEx(hdc,800,800,NULL); hpen=(HPEN)GetStockObject(BLACK_PEN); SelectObject(hdc,hpen); voronoi(-1,0,R,hdc); EndPaint(hWnd,&ps); break; case WM_CLOSE: //准备退出 DestroyWindow( hWnd ); //释放窗口 break; case WM_DESTROY: //如果窗口被人释放… PostQuitMessage( 0 ); //给窗口发送WM_QUIT消息 return 0; default: return( DefWindowProc(hWnd, message, wParam, lParam)); } return 0; }

Below,编译结果　　WHAT'S WRONG!

*********************************************************************************** Deleting intermediate files and output files for project ’world - Win32 Debug’. --------------------Configuration: world - Win32 Debug-------------------- Compiling... world.cpp c:\documents and settings\student\桌面\1\world.cpp(58) : warning C4715: ’voronoi’ : not all control paths return a value Linking... LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main Debug/world.exe : fatal error LNK1120: 1 unresolved externals Error executing link.exe. world.exe - 2 error(s), 1 warning(s)