Cohen-Sutherland Line Clipping Algorithm Using C++

// Program to implement Cohen-Sutherland Line Clipping Algorithm Using C++.

#include<iostream>

#include<graphics.h>
typedef unsigned int outcode;
enum{TOP=0x1,BOTTOM=0x2,RIGHT=0x4,LEFT=0x8};

using namespace std;

outcode CompOutCode(double ,double ,double ,double ,double ,double );
void CSLCAD(double x0,double y0,double x1,double y1,double xmin,double xmax,double ymin,double ymax)
{

    outcode outcode0,outcode1,outcodeout;
    boolean accept=FALSE, done=FALSE;
    outcode0=CompOutCode(x0,y0,xmin,xmax,ymin,ymax);
    outcode1=CompOutCode(x1,y1,xmin,xmax,ymin,ymax);
    cout<<"outcode0="<<outcode0<<endl;
    cout<<"outcode1="<<outcode1<<endl;
    do
    {
        if(outcode0==0 && outcode1==0)
        {
            accept=TRUE;
            done=TRUE;
        }
        else if(outcode0 & outcode1)
            {
                done=TRUE;
            }
            else
            {
                double x,y;
                int ocd=outcode0 ? outcode0:outcode1;
                if(ocd & TOP)
                {
                    x=x0+(x1-x0)*(ymax-y0)/(y1-y0);
                    y=ymax;
                }
                else if(ocd & BOTTOM)
                {
                    x=x0+(x1-x0)*(ymin-y0)/(y1-y0);
                    y=ymin;
                }
                else if(ocd & LEFT)
                {
                    y=y0+(y1-y0)*(xmin-x0)/(x1-x0);
                    x=xmin;
                }
                else
                {
                    y=y0+(y1-y0)*(xmax-x0)/(x1-x0);
                    x=xmax;
                }
                if(ocd==outcode0)
                {
                    x0=x;
                    y0=y;
                    outcode0=CompOutCode(x0,y0,xmin,xmax,ymin,ymax);
                }
                else
                {
                    x1=x;
                    y1=y;
                    outcode1=CompOutCode(x1,y1,xmin,xmax,ymin,ymax);
                }
            }

    }while(done==FALSE);

    if(accept==TRUE)
    {
        line(x0,y0,x1,y1);
    }
}

outcode CompOutCode(double x,double y,double xmin,double xmax,double ymin,double ymax)
{
    outcode code=0;
    if(y>ymax)
        code|=TOP;
    if(y<ymin)
        code|=BOTTOM;
    if(x>xmax)
        code|=RIGHT;
    if(x<xmin)
        code|=LEFT;
    return code;
}

int main()
{
    string ch;
    double xmin,xmax,ymin,ymax,x0,y0,x1,y1;

    initwindow(500,600);

    cout<<"Enter the bottom co-ordinates of window:";
 cin>>xmin;
 cout<<"Enter the left coordinates of the window:";
 cin>>ymin;
 cout<<"Enter the right coordinates of the window:";
 cin>>xmax;
 cout<<"Enter the top coordinates of the window:";
 cin>>ymax;
 rectangle(xmin,ymin,xmax,ymax);

 cout<<"Enter the coordinates(Terminal Points) of the line: ";
 cin>>x0>>y0;
 cin>>x1>>y1;
 line(x0,y0,x1,y1);

    delay(5000);
    cleardevice();
    CSLCAD(x0,y0,x1,y1,xmin,xmax,ymin,ymax);
    rectangle(xmin,ymin,xmax,ymax);
    delay(50000);

    closegraph();
}

// Output of the above program

Cohen-Sutherland Line Clipping Algorithm Using C++

Cohen-Sutherland Line Clipping Algorithm Using C++

Cohen-Sutherland Line Clipping Algorithm Using C++

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