using event handler

Question

is there a way to use mouse as an event handler in c/c++ im making a game on snakes and ladder (the famous board game) and trying to make it with basic borland c++ compiler working with a header file called graphics.h, which is very basic and gives output of 640 X 480 res, so I was wondering if there is a possiblity of using mouse as an event handler (about which i have no experiance)to have control over the palyer coins on the board.

Answer 1

I'm not sure which version of graphics.h you happen to have, but there are functions getmousey, getmousey, clearmouseclick and getmouseclick. See this for some documentation that may work for you.

It appeas that you can use registermousehandler and a call-back function to do some level of event-based programming. Here's a sample from the document I sent you.

// The click_handler will be called whenever the left mouse button is
// clicked. It checks copies the x,y coordinates of the click to
// see if the click was on a red pixel. If so, then the boolean
// variable red_clicked is set to true. Note that in general
// all handlers should be quick. If they need to do more than a little
// work, they should set a variable that will trigger the work going,
// and then return.
bool red_clicked = false;
void click_handler(int x, int y)
{
    if (getpixel(x,y) == RED)
    red_clicked = true;
}

// Call this function to draw an isosoles triangle with the given base and
// height. The triangle will be drawn just above the botton of the screen.
void triangle(int base, int height)
{
    int maxx = getmaxx( );
    int maxy = getmaxy( );
    line(maxx/2 - base/2, maxy - 10, maxx/2 + base/2, maxy - 10);
    line(maxx/2 - base/2, maxy - 10, maxx/2, maxy - 10 - height);
    line(maxx/2 + base/2, maxy - 10, maxx/2, maxy - 10 - height);
}
void main(void)
{
    int maxx, maxy; // Maximum x and y pixel coordinates
    int divisor; // Divisor for the length of a triangle side
    // Put the machine into graphics mode and get the maximum coordinates:
    initwindow(450, 300);
    maxx = getmaxx( );
    maxy = getmaxy( );
    // Register the function that handles a left mouse click
    registermousehandler(WM_LBUTTONDOWN, click_handler);
    // Draw a white circle with red inside and a radius of 50 pixels:
    setfillstyle(SOLID_FILL, RED);
    setcolor(WHITE);
    fillellipse(maxx/2, maxy/2, 50, 50);
    // Print a message and wait for a red pixel to be double clicked:
    settextstyle(DEFAULT_FONT, HORIZ_DIR, 2);
    outtextxy(20, 20, "Left click in RED to end.");
    setcolor(BLUE);
    red_clicked = false;
    divisor = 2;
    while (!red_clicked)
    {
        triangle(maxx/divisor, maxy/divisor);
        delay(500);
        divisor++;
    }
    cout << "The mouse was clicked at: ";
    cout << "x=" << mousex( );
    cout << " y=" << mousey( ) << endl;
    // Switch back to text mode:
    closegraph( );
}

Answer 2

You can use Mouse and Keyboard events using Win32 Programming (In Visual Studio).

Is it the requirement to use borland c++.

I think similar APIs are there in borland c++.

You can refer http://www.functionx.com/win32/index.htm for more information on event handling in Visual Studio using Win32 Programming.