Graphics_solutions/LineClipping.cpp at main · Coderu2058/Graphics_solutions · GitHub

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#include <iostream.h>
#include <conio.h>
#include <graphics.h>
#include <dos.h>
class data
{
    int gd, gmode, x, y, xmin,ymin,ymax,xmax;
    int a1,a2;
    float x1, y1,x2,y2,x3,y3;
    int xs, ys, xe, ye;
    float maxx,maxy;
    public:
        void getdata ();
        void find ();
        void clip ();
        void display (float, float,float,float);
        void checkonof (int);
        void showbit (int);
};
void data :: getdata ()
{
    cout<<"Enter the minimum and maximum coordinate of window (x, y) ";
           cin >>xmin>>ymin>>xmax>>ymax;
           cout<<"Enter the end points of the line to be clipped";
           cin >>xs>>ys>>xe>>ye;
           display (xs, ys, xe,ye);
}
void data :: display (float, xs, float, ys,float xe, float ye)
{
    int gd=DETECT;
    initgraph (&gd,&gmode, "");
    maxx=getmaxx();
    maxy=getmaxy();
    line (maxx/2,0,maxx/2,maxy);
    line (0, maxy/2,maxx,maxy/2);
    rectangle (maxx/2+xmin,maxy/2-ymax,maxx/2+xmax,maxy/2-ymin);
    line (maxx/2+xs,maxy/2-ys,maxx/2+xe,maxy/2-ye);
    getch();
}
void data :: find ()
{
    a1=0;
    a2=0;
    if ((ys-ymax)>0)
               a1+=8;
    if ((ymin-ys)>0)
        a1+=4;
    if ((xs-xmax)>0)
         a1+=2;
            if ((xmin-xs)>0)
         a1+=1;
     if ((ye-ymax)>0)
        a2+=8;
           if ((ymin-ye)>0)
              a2+=4;
          if ((xe-xmax)>0)
               a2+=2;
          if ((xmin-xe)>0)
                a2+=1;
         cout<<"\nThe area code of Ist point is ";
                 showbit (a1);
         getch ();
         cout <<"\nThe area code of 2nd point is ";
         showbit (a2);
         getch ();
}
void data :: showbit (int n)
{
        int i,k, and;
        for (i=3;i>=0;i--)
        {
              and =1<<i;
       k = n?
       k ==0?cout<<"0": cout<<"1\"";
          }
}
void data ::clip()
{
         int j=a1&a2;
         if (j==0)
         {
              cout<<"\nLine is perfect candidate for clipping";
              if (a1==0)
       {
                    else
             {
                   checkonof(a1);
                   x2=x1;y2=y1;
             }
             if (a2=0)
            {
                 x3=xe; y3=ye;
            }
           else
           {
                   checkonof (a2);
                   x3=x1; y3=y1;
            }
            xs=x2; ys=y2;xe=x3;ye=y3;
            cout << endl;
            display (xs,ys,xe,ye);
            cout<<"Line after clipping";
            getch ()
          }
       else if ((a1==0) && (a2=0))
       {
               cout <<"\n Line is in the visible region";
               getch ();
       }
}
void data :: checkonof (int i)
{
      int j, k,l,m;
      1=i&1;
      x1=0;y1=0;
       if (1==1)
      {
             x1=xmin;
             y1=ys+ ((x1-xs)/ (xe-xs))*(ye-ys);
      }
      j=i&8;
   if (j>0)
   {
             y1=ymax;
      x1=xs+(y1-ys)/(ye-ys))*(xe-xs);
    }
    k=i & 4;
    if (k==1)
    {
           y1=ymin;
           x1=xs+((y1-ys)/(ye-ys))*(xe-xs);
    }
    m= i&2;
     if (m==1)
     {
            x1=xmax;
            y1=ys+ ((x1-xs)/ (xe-xs))*(ye-ys);
      }
      main ()
      {
             data s;
             clrscr();
             s.getdata();
             s.find();
             getch();
             closegraph ();
             return ();
    }