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Microsoft OS/2 SDK PM 08-08-1988

/*-------------------------------------------
   CHECKER1.C -- Mouse Hit-Test Demo Program 
  -------------------------------------------*/

#define INCL_WIN
#define INCL_GPI

#include <os2.h>
#include <stddef.h>

#define DIVISIONS 5

MRESULT EXPENTRY ClientWndProc (HWND, USHORT, MPARAM, MPARAM) ;

int main (void)
     {
     static CHAR szClientClass [] = "Checker1" ;
     HAB         hab ;
     HMQ         hmq ;
     HWND        hwndFrame, hwndClient ;
     QMSG        qmsg ;
     ULONG       flFrameFlags = FCF_STANDARD & ~FCF_MENU ;
     ULONG       flFrameStyle = WS_VISIBLE ;

     hab = WinInitialize (0) ;
     hmq = WinCreateMsgQueue (hab, 0) ;

     WinRegisterClass (hab, szClientClass, ClientWndProc, CS_SIZEREDRAW, 0) ;

     hwndFrame = WinCreateStdWindow (HWND_DESKTOP, flFrameStyle,
                                     &flFrameFlags, szClientClass,
                                     "Mouse Hit-Test Program No. 1",
                                     0L, NULL, 0, &hwndClient) ;

     while (WinGetMsg (hab, &qmsg, NULL, 0, 0))
          WinDispatchMsg (hab, &qmsg) ;

     WinDestroyWindow (hwndFrame) ;
     WinDestroyMsgQueue (hmq) ;
     WinTerminate (hab) ;
     
     return 0 ;
     }

VOID DrawLine (HPS hps, LONG x1, LONG y1, LONG x2, LONG y2)
     {
     POINTL ptl ;

     ptl.x = x1 ;  ptl.y = y1 ;  GpiMove (hps, &ptl) ;
     ptl.x = x2 ;  ptl.y = y2 ;  GpiLine (hps, &ptl) ;
     }

MRESULT EXPENTRY ClientWndProc (HWND hwnd, USHORT msg, MPARAM mp1, MPARAM mp2)
     {
     static BOOL  bBlockState [DIVISIONS] [DIVISIONS] ;
     static SHORT xBlock, yBlock ;
     HPS          hps ;
     RECTL        rcl ;
     SHORT        x, y ;

     switch (msg)
          {
          case WM_SIZE:
               xBlock = SHORT1FROMMP (mp2) / DIVISIONS ;
               yBlock = SHORT2FROMMP (mp2) / DIVISIONS ;
               return 0 ;

          case WM_BUTTON1DOWN:
          case WM_BUTTON1DBLCLK:
               if (xBlock > 0 && yBlock > 0)
                    {
                    x = SHORT1FROMMP (mp1) / xBlock ;
                    y = SHORT2FROMMP (mp1) / yBlock ;

                    if (x < DIVISIONS && y < DIVISIONS)
                         {
                         bBlockState [x][y] = !bBlockState [x][y] ;

                         rcl.xRight = xBlock + (rcl.xLeft   = x * xBlock) ;
                         rcl.yTop   = yBlock + (rcl.yBottom = y * yBlock) ;

                         WinInvalidateRect (hwnd, &rcl, FALSE) ;
                         }
                    else
                         WinAlarm (HWND_DESKTOP, WA_WARNING) ;
                    }
               else
                    WinAlarm (HWND_DESKTOP, WA_WARNING) ;

               return 1 ;

          case WM_PAINT:
               hps = WinBeginPaint (hwnd, NULL, NULL) ;

               GpiErase (hps) ;

               if (xBlock > 0 && yBlock > 0)
                    for (x = 0 ; x < DIVISIONS ; x++)
                         for (y = 0 ; y < DIVISIONS ; y++)
                              {
                              rcl.xRight = xBlock + (rcl.xLeft   = x * xBlock);
                              rcl.yTop   = yBlock + (rcl.yBottom = y * yBlock);

                              WinDrawBorder (hps, &rcl, 1, 1,
                                             CLR_NEUTRAL, CLR_BACKGROUND,
                                             DB_STANDARD | DB_INTERIOR) ;

                              if (bBlockState [x][y])
                                   {
                                   DrawLine (hps, rcl.xLeft,  rcl.yBottom,
                                                  rcl.xRight, rcl.yTop) ;

                                   DrawLine (hps, rcl.xLeft,  rcl.yTop,
                                                  rcl.xRight, rcl.yBottom) ;
                                   }
                              }
               WinEndPaint (hps) ;
               return 0 ;
          }
     return WinDefWindowProc (hwnd, msg, mp1, mp2) ;
     }

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