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# Program of Liang Barsky Algorithm for Line Clipping

Posted By: Easy Tutor     Category: C++ Programming     Views: 8838

## Code for Program of Liang Barsky Algorithm for Line Clipping in C++ Programming

```#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<iostream.h>
#include<stdlib.h>
#include<math.h>

#definefalse 0
#definetrue  1

FILE *fin = fopen("cosuth.in","r");
float u1,u2,dx,dy;
float t1,t2,t3,t4,t5,t6;

class point
{
int x,y;
int code[4];
public:
void getxy()
{
fscanf(fin,"%d %d",&x,&y);
}
void putxy(int x1,int y1)
{
x = x1;
y = y1;
}
void friend clipline(point p1,point p2);
int friend cliptest(float p,float q,float *u1,float *u2);
void friend drawline(point p1,point p2);

}p1,p2,pt[20],winmin,winmax;

void clipline(point p1,point p2)
{
rectangle(80,420,426,160);

u1 = 0.0;
u2 = 1.0;

dx = p2.x - p1.x;
t1 = p1.x - winmin.x;
t2 = winmax.x - p1.x;
t3 = p1.y - winmin.y;
t4 = winmax.y - p1.y;
t5 = -1 * dx;

if (cliptest(t5,t1,&u1,&u2) == 1)
{
if (cliptest(dx,t2,&u1,&u2) == 1)
{
dy = float(p2.y - p1.y);
t6 = -1 * dy;
if (cliptest(t6,t3,&u1,&u2) == 1)
{
if (cliptest(dy,t4,&u1,&u2) == 1)
{
if (u1 > 0.0)
{
(int)p1.x = p1.x + (u1 * dx);
(int)p1.y = p1.y + (u1 * dy);
}
if (u2 < 1.0)
{
(int)p2.x = p1.x + (u2 * dx);
(int)p2.y = p1.y + (u2 * dy);
}
}
}
}
}
drawline(p1,p2);
getch();
}

int cliptest(float p,float q,float *u1,float *u2)
{
float r;
int flag;

flag = 1;

if (p < 0.0)
{
r = (float) q / p;
if (r > *u2)
{
flag = 0;
}
else
{
if (r > *u1)
{
*u1 = r;
}
}
}
else
{
if (p > 0.0)
{
r = (float) q / p;
if (r < *u1)
{
flag = 0;
}
else
{
if (r < *u2)
{
*u2 = r;
}
}
}
else
{
if (q < 0.0)
{
flag = 0;
}
}
}
return(flag);
}

void drawline(point p1,point p2)
{
line(p1.x,p1.y,p2.x,p2.y);
}

void main()
{
int drv=DETECT,mode,totalpoint,i;

clrscr();

printf("\nHow many line will be on the screen : ");
fscanf(fin,"%d",&totalpoint);

for(i = 0;i < totalpoint ; i++)
{
printf("\nEnter their x and y coordinates of %d point:\n",i+1);
pt[i].getxy();
}

initgraph(&drv,&mode,"c:\\Borlandc\\bgi");
winmin.putxy(80,160);
winmax.putxy(420,426);
rectangle(80,420,426,160);

i = 0;

do
{
drawline(pt[i],pt[i+1]);
i++;
}
while(i < totalpoint-1);

getch();
clearviewport();

i = 0;
do
{
clipline(pt[i],pt[i+1]);
i++;
}
while(i < totalpoint-1);
getch();
}
```
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 Easy Tutor author of Program of Liang Barsky Algorithm for Line Clipping is from United States. Easy Tutor says Hello Friends,I am Free Lance Tutor, who helped student in completing their homework. I have 4 Years of hands on experience on helping student in completing their homework. I also guide them in doing their final year projects.I have share many programs on this website for everyone to use freely, if you need further assistance, than please contact me on easytutor.2ya [at the rate] gmail [dot] comI have special discount scheme for providing tutor services. I am providing tutor service to students from various contries, currently most of my students are from United States, India, Australia, Pakistan, Germany, UK and Canada. I am also here to expand my technical network to receive more opportunity in my career, make friends to help them in resolving their technical problem, learn and share my knowledge, If you like to be my friend, Please send me friend request.Thanks,Happy Programming :) View All Articles

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