using event handler
Question
is there a way to use mouse as an event handler in c/c++ im a student and got a mini project to do, 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.
I am in second year engineering (branch computer science )
thx in advance for the help!
Solution
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( );
}
OTHER TIPS
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.