Mouse Pointer Restricted In A Circle program using C

 Mouse Pointer Restricted In A Circle

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The program given below is to demonstrate that a mouse pointer is restricted in a circle .

Header files used :-

• graphics.h
• conio.h
• dos.h
• stdlib.h
• math.h

User defined functions used are:-

• showmouseptr
• hidemouseptr
• getmousepos
• movemouseptr

The given small tool is used in many games to make logical games , in many games the restriction tool is used to control the activity of the character in the game ,while restricting the gamer to do unnecessary activities in game

#include<graphics.h>

#include<conio.h>n

#include<dos.h>

#include<stdlib.h>

#include<math.h>

union REGS i, o;

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 hidemopuseptr()

{

   i.x.ax = 2;

   int86(0X33, &i, &o);

}

 

void getmousepos(int *x, int *y)

{

   i.x.ax = 3;

   int86(0X33, &i, &o);

   *x = o.x.cx;

   *y = o.x.dx;

 

}

 

void movemouseptr(int x, int y)

{

   i.x.ax = 4;

   i.x.cx = x;

   i.x.dx = y;

   int86(0X33, &i, &o);

}

 

main()

{

   int gd = DETECT, gm, midx, midy, radius, x, y, tempx, tempy;

 

   radius = 100;

 

   initgraph(&gd, &gm, "C:\\turboc3\\bgi");

 

   if(!initmouse())

   {

      closegraph();

      exit(1);

   }

 

   midx = getmaxx()/2;

   midy = getmaxy()/2;

 

   showmouseptr();

   movemouseptr(midx, midy);

   circle(midx, midy, radius);

 

   x = tempx = midx;

   y = tempy = midy;

 

   while(!kbhit())

   {

       getmousepos(&x, &y);

 

       if((pow(x-midx,2)+pow(y-midy,2)-pow(radius,2))>0)

      {

          movemouseptr(tempx, tempy);

         x = tempx;

         y = tempy;

      }

 

      tempx = x;

      tempy = y;

   }

 

   closegraph();

   return 0;

}