How To Create a Restrict Mouse Pointer In a Circle in C Or C++ (Computer Graphics)

                                                                     PROJECT BY

(SIMPLIFY LEARN PROGRAMMING) 

ON

RESTRICT MOUSE POINTER IN A CIRCLE


SOURCE CODE:

#include<graphics.h>

#include<conio.h>

#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:\\TC\\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;

}


OUTPUT:





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