Liang-Barsky Algorithm CG

This program is for implementing Liang Barsky Algorithm. This is a part of Mumbai University MCA Colleges Computer Graphics CG MCA Sem 2

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<math.h>

main()

{

 int i, gm,gd;

 int x1, x2, y1, y2, xmin, xmax, ymin, ymax, xx1, xx2, yy1, yy2;

 float t1, t2, p[4], q[4], temp;

 detectgraph(&gd,&gm);

 initgraph(&gd,&gm,"C:/tc/bgi/");

 xmin=150;

 xmax=450;

 ymin=100;

 ymax=400;

 rectangle(xmin,ymin,xmax,ymax);

 printf("Enter the starting point: ");

 scanf("%d%d",&x1,&y1);

 printf("Enter the ending point: ");

 scanf("%d%d",&x2,&y2);

 printf("Line before clipping:");

 line(x1,y1,x2,y2);

 getch();

 clrscr();

 printf("Line after clipping:");

 rectangle(xmin,ymin,xmax,ymax);

 p[0]=-(x2-x1);

 p[1]=(x2-x1);

 p[2]=-(y2-y1);

 p[3]=(y2-y1);

 q[0]=(x1-xmin);

 q[1]=(xmax-x1);

 q[2]=(y1-ymin);

 q[3]=(ymax-y1);

 for(i=0;i<4;i++)

 {

            if(p[i]==0)

            {

                        printf("\nLine is parallel to one of the clipping boundary");

                        if(q[i]>=0)

                        {

                                    if(i<2)

                                    {

                                         if(y1<ymin)

                                         {

                                                y1=ymin;

                                         }

                                         if(y2>ymax)

                                         {

                                                y2=ymax;

                                         }

                                         line(x1,y1,x2,y2);

                                    }

                                    if(i>1)

                                    {

                                         if(x1<xmin)

                                         {

                                                x1=xmin;

                                         }

                                         if(x2>xmax)

                                         {

                                                x2=xmax;

                                         }

                                         line(x1,y1,x2,y2);

                                    }

                        }

                        getch();

                        return(0);

             }

 }



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