#include<stdio.h>
#include<graphics. h>
#include<math.h>
#define Round(val)((int)(val+.5))
    
int maxx, maxy, miny, minx;

void main() {

   int gd = DETECT, gm;

   void clipping(int xa, int ya, int xb, int y);

   int xa, xb, ya, yb;

   printf("Enter the window coordination");

   scanf("%d%d%d%d", &minx, &maxy, &maxx, &miny);

   printf("Enter the two and points for the line");

   scanf("%d%d%d%d", &xa, &ya, &xb, &yb);

   initgraph(&gd, &gm, "");
   rectangle(minx, miny, maxx, maxy);

   line(xa, ya, xb, yb);

   getch();

   closegraph();
}

void clipping(int xa, int ya, int xb, int yb) {
   int Dx = xb - xa, Dy = yb - ya, steps, k;

   int visible1 = 0, visible2 = 0;

   float xin, yin, x = xa, y = ya;
   if (abs(Dx) > abs(Dy))

      steps = abs(Dx);
   else

      steps = abs(Dy);

   xin = Dx / (float) steps;

   yin = Dy / (float) steps;

   putpixel(Round(x), Round(y), 2);



   for (k = 0; k < steps; k++) {

      x += xin;
      y += yin;
      if ((y > miny && y < maxx)) {

         visible1 = 1;

         putpixel(Round(x), Round(y), 2);

      } else

         visible2 = 1;
   }
   if (visible1 == 0)

      outtextxy(20, 200, "complextely visible");

   if (visible1 == 1 && visible2 == 1)

      outtextxy(20, 20, "partialy visible");
   if (visible1 == 1 && visible2 == 0)

      outtextxy(20, 20, "completly visible");

}