/*
Topic-LIYAN BASKY LINE CLIPPING ALGORITHM IN JAVA
*/
import java.awt.*;
import java.applet.*;
import java.math.*;
import java.io.*;
import java.util.*;
public class LB extends Applet
{
Scanner d=new Scanner(System.in);
public void paint(Graphics g)
{
System.out.println("enter value of xmin");
int xmin=d.nextInt();
System.out.println("enter value of ymin");
int ymin=d.nextInt();
System.out.println("enter value of xmax");
int xmax=d.nextInt();
System.out.println("enter value of ymax");
int ymax=d.nextInt();
int p[]=new int[4];
int q[]=new int[4];
System.out.println("enter value of x1");
int x1=d.nextInt();
System.out.println("enter value of y1");
int y1=d.nextInt();
System.out.println("enter value of x2");
int x2=d.nextInt();
System.out.println("enter value of y2");
int y2=d.nextInt();
g.drawLine(xmin,ymin,xmin,ymax);
g.drawLine(xmin,ymax,xmax,ymax);
g.drawLine(xmax,ymax,xmax,ymin);
g.drawLine(xmax,ymin,xmin,ymin);
g.drawLine(x1,y1,x2,y2);
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;
float t1=0,t2=1;
int flag=0;
for(int i=0;i<4;i++)
{
if(p[i]==0)
{
if(q[i]>=0)
{
if(i<2)
{
if(y1<ymin)
y1=ymin;
if(y2>ymax)
y2=ymax;
}
if(i>1)
{
if(x1<xmin)
x1=xmin;
if(x2>xmax)
x2=xmax;
}
flag=1;
g.drawLine(x1,y1,x2,y2);
}
}
}
if(flag==0)
{
for(int i=0;i<4;i++)
{
float t=(float)q[i]/(float)p[i];
if(p[i]<0)
{
if(t1<t)
t1=t;
}
else
{
if(t2>t)
t2=t;
}
}
if(t1<t2)
{
int xx1=(int)(x1+t1*p[1]);
int xx2=(int)(x1+t2*p[1]);
int yy1=(int)(y1+t1*p[3]);
int yy2=(int)(y1+t2*p[3]);
xmin =xmin + 200;
ymin =ymin + 400;
xmax =xmax + 200;
ymax =ymax + 400;
xx1 =xx1 + 200;
xx2 =xx2 + 200;
yy1 =yy1 + 400;
yy2 =yy2 + 400;
g.drawLine(xmin,ymin,xmin,ymax);
g.drawLine(xmin,ymax,xmax,ymax);
g.drawLine(xmax,ymax,xmax,ymin);
g.drawLine(xmax,ymin,xmin,ymin);
g.drawLine(xx1,yy1,xx2,yy2);
}
}
}
}
/*
<applet code="LB.class" width=700 height=700>
</applet>
*/
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