big leap

This is a discussion on big leap within the Windows Programming forums, part of the Platform Specific Boards category; Hello. I am just learning the basics of the win32 API at the moment and I realise that I need ...

  1. #1
    Registered User
    Join Date
    Feb 2003
    Posts
    60

    Smile big leap

    Hello. I am just learning the basics of the win32 API at the moment and I realise that I need to actually create a functioning app before I can get the real gist of it. I have written a simple Tic Tac Toe game in C++ (Console) and I was wondering if anyone has some tips on which cases handle things the best.

    My plan is to have 9 child windows populating the top level window and they respond to the user clicking on them. I am just concerned with what to do with all these clicks!
    I have a vague idea that the parent will get sent a message from the kids and I need to tell the 'engine' (LOL) everytime parent gets one of these.

    I am thinking that the 'engine' will live in the WM_COMMAND case and may send messages to a sub switch of WM_CREATE, for displaying wins and so fourth, but I would like some expert advice on whether I am heading down the right path or not. Any pointers would be much appreciated.

    PS I think win32 programming will be great fun!
    "It compiled, let's ship it!"

    Guitar Australia
    my site for some easy tutorials.

  2. #2
    Registered User
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    Feb 2003
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    76
    It would be simpler if you drew the tic-tac-toe board on the main window, instead of using nine child windows:

    To make the code easier to maintain, break the code into functions.

    Code:
    #define SQUARE_BLANK 0
    #define SQUARE_X 1
    #define SQUARE_O 2
    
    void DrawSquare(HDC hdc, int x, int y, int square){
     switch(square){
      case SQUARE_BLANK:
       // draw a blank square
       break;
      case SQUARE_X:
       // draw an X
       break;
      case SQUARE_O:
       // draw an O
       break; 
     }
    }
    
    // in the window procedure 
    // mouse click handler
    case WM_LBUTTONDOWN:{
     POINT pt;
     int x,y;
     GetCursorPos(&pt);
     x=GetClickedColumn(hwnd,&pt); // app-defined function
     y=GetClickedRow(hwnd,&pt); // app-defined function
     squares[x][y]=CurrentSquareType;
     // app-defined function - returns X, O, or BLANK
     CurrentSquareType=GetNextSquare(CurrentSquareType);
     break;
    }
    // drawing handler
    case WM_PAINT:{
     HDC hdc;
     PAINTSTRUCT ps;
     int i,j;
     hdc=BeginPaint(hwnd,&ps);
     for(i=0;i<3;i++){
      for(j=0;j<3;j++){
       DrawSquare(hdc,i,j,squares[i][j]);
      }
     }
     EndPaint(hwnd,&ps); 
     break;
    }
    Something like this to get you started. You shouldn't send or post a WM_CREATE message to the window after its creation.

    WM_COMMAND messages are usually processed through notifications by menus and standard Windows controls. Since this program is to be kept as simple as possible, no WM_COMMAND processing is necessary, unless you want to add a menu.

    To exit the program, process the WM_CLOSE message by calling PostQuitMessage:

    Code:
    case WM_CLOSE:
     PostQuitMessage(0);
     break;

  3. #3
    train spotter
    Join Date
    Aug 2001
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    near a computer
    Posts
    3,856
    As poccil says nine windows is a bit much.

    I would use an array of 9 RECT structs for the indvidual squares

    Then you can use a loop and the

    PtInRect() function with the mouse click coods on a WM_LBUTTONDOWN msg.

    Something like this

    Code:
    case WM_LBUTTONDOWN:
    POINTSTOPOINT(ptsClient,MAKEPOINTS(lParam));
    CopyMemory(&ptsScreen,&ptsClient,sizeof(POINT));
    GetWindowRect(hWnd,&rScreenRect);
    ClientToScreen(hWnd,&ptsScreen);
    if(!PtInRect(&rScreenRect,ptsScreen))//is not in main window
        break;
    for(i=0;i<9;i++)
    { 
         if(PtInRect(&rBoardRect[i],ptsClient))
         {  
       //this square was clicked
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

    "I spent a lot of my money on booze, birds and fast cars......the rest I squandered."
    George Best

    "If you are going through hell....keep going."
    Winston Churchill

  4. #4
    Registered User
    Join Date
    Feb 2003
    Posts
    60
    Thanks very much fellas! I think with your advice I can really start playing around with this program. And I think this one incorporates enough to submerge me into the world of win32 and get thinking the right way. Once again thanks.
    "It compiled, let's ship it!"

    Guitar Australia
    my site for some easy tutorials.

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