endjoin.c

《Windows程序设计》配套代码、LZW压缩算法源代码、Socket异步通信示程序代码

/*----------------------------------------
   ENDJOIN.C -- Ends and Joins Demo
                (c) Charles Petzold, 1998
  ----------------------------------------*/

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("EndJoin") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;
     
     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = WndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = NULL ;
     wndclass.lpszClassName = szAppName ;
     
     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"),
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName, TEXT ("Ends and Joins Demo"),
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;
     
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;
     
     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
     static int  iEnd[] = { PS_ENDCAP_ROUND, PS_ENDCAP_SQUARE, PS_ENDCAP_FLAT };
     static int  iJoin[]= { PS_JOIN_ROUND,   PS_JOIN_BEVEL,    PS_JOIN_MITER } ;
     static int  cxClient, cyClient ;
     HDC         hdc ;
     int         i ;
     LOGBRUSH    lb ;
     PAINTSTRUCT ps ;
     
     switch (iMsg)
     {
     case WM_SIZE:
          cxClient = LOWORD (lParam) ;
          cyClient = HIWORD (lParam) ;
          return 0 ;
          
     case WM_PAINT:
          hdc = BeginPaint (hwnd, &ps) ;
          
          SetMapMode (hdc, MM_ANISOTROPIC) ;
          SetWindowExtEx (hdc, 100, 100, NULL) ;
          SetViewportExtEx (hdc, cxClient, cyClient, NULL) ;
          
          lb.lbStyle = BS_SOLID ;
          lb.lbColor = RGB (128, 128, 128) ;
          lb.lbHatch = 0 ;
          
          for (i = 0 ; i < 3 ; i++)
          {
               SelectObject (hdc,
                    ExtCreatePen (PS_SOLID | PS_GEOMETRIC |
                                  iEnd [i] | iJoin [i], 10,
                                  &lb, 0, NULL)) ;
               BeginPath (hdc) ;
               
               MoveToEx (hdc, 10 + 30 * i, 25, NULL) ;
               LineTo   (hdc, 20 + 30 * i, 75) ;
               LineTo   (hdc, 30 + 30 * i, 25) ;
               
               EndPath (hdc) ;
               StrokePath (hdc) ;
               
               DeleteObject (
                    SelectObject (hdc,
                         GetStockObject (BLACK_PEN))) ;
               
               MoveToEx (hdc, 10 + 30 * i, 25, NULL) ;
               LineTo   (hdc, 20 + 30 * i, 75) ;
               LineTo   (hdc, 30 + 30 * i, 25) ;
          }
          EndPaint (hwnd, &ps) ;
          return 0 ;
          
     case WM_DESTROY:
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
}