Programming Windows程式开发设计指南->第五章 例子程序2

/*_############################################################################
  _##
  _##  Programming Windows程式开发设计指南->第五章 例子程序2
  _##  Author: xwlee                        
  _##  Time: 2007.06.18 
  _##  Chang'an University
  _##  Development condition: win2003 Server+VC6.0
  _##
  _##  程序5-2  LINEDEMO
  _##  LINEDEMO.C 文件
  _##  画一个矩形、一个椭圆、一个圆角矩形和两条线段，不过不是按这一顺序。
  _##  程序表明了定义封闭区域的函数实际上对这些区域进行了填入，因为在椭圆后面的线被遮住了
  _## 
  _##
  _##    LINEDEMO.C -- Line-Drawing Demonstration Program
  _##     (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 ("LineDemo") ;
       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 ("Program requires Windows NT!"),
                     szAppName, MB_ICONERROR) ;
              return 0 ;
       }

       hwnd = CreateWindow (       szAppName, TEXT ("Line Demonstration"),
                                            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 message, WPARAM wParam, LPARAM lParam)
{
       static int  cxClient, cyClient ;
       HDC              hdc ;
       PAINTSTRUCT ps ;
   
       switch (message)
       {
       case WM_SIZE:
              cxClient = LOWORD (lParam) ;
              cyClient = HIWORD (lParam) ;
              return 0 ;
         
       case WM_PAINT:
              hdc = BeginPaint (hwnd, &ps) ;
        
              Rectangle (hdc,     cxClient / 8,     cyClient / 8,
                        7 * cxClient / 8, 7 * cyClient / 8) ;
      
              MoveToEx  (hdc,        0,        0, NULL) ;

              LineTo    (hdc, cxClient, cyClient) ;

              MoveToEx  (hdc,        0, cyClient, NULL) ;

              LineTo    (hdc, cxClient,        0) ;

              Ellipse   (hdc,     cxClient / 8,     cyClient / 8,
                        7 * cxClient / 8, 7 * cyClient / 8) ;  // 椭圆

              RoundRect (hdc,     cxClient / 4,     cyClient / 4,

                        3 *    cxClient / 4, 3 * cyClient / 4,

                           cxClient / 6,    cyClient / 6) ;
       

              EndPaint (hwnd, &ps) ;
              return 0 ;

       case       WM_DESTROY:
              PostQuitMessage (0) ;
              return 0 ;
       }

       return DefWindowProc (hwnd, message, wParam, lParam) ;
}