This program restricts mouse pointer in a rectangle. When this program is executed the mouse pointer is restricted in a rectangle i.e. you can't move mouse pointer out of the rectangle.
/* Program to restrict mouse-pointer */
C program
#include<graphics.h>
#include<conio.h>
int initmouse();
void showmouseptr();
void hidemouseptr();
void restrictmouseptr(int, int, int, int);
union REGS i, o;
main()
{
int status, gd = DETECT, gm;
initgraph(&gd,&gm,"C:\\TC\\BGI");
settextstyle(DEFAULT_FONT,0,2);
status = initmouse();
if ( status == 0 )
outtext("Mouse support not available.\n");
else
{
showmouseptr();
rectangle(120,70,520,410);
restrictmouseptr(120,70,520,410);
}
getch();
return 0;
}
int initmouse()
{
i.x.ax = 0;
int86(0X33, &i, &o);
return ( o.x.ax );
}
void showmouseptr()
{
i.x.ax = 1;
int86(0X33, &i, &o);
}
void restrictmouseptr(int x1, int y1, int x2, int y2)
{
i.x.ax = 7;
i.x.cx = x1;
i.x.dx = x2;
int86(0X33, &i, &o);
i.x.ax = 8;
i.x.cx = y1;
i.x.dx = y2;
int86(0X33, &i, &o);
}