#include<conio.h>

#include<stdio.h>

#include<graphics.h>

#include<dos.h>

void fill_right(x,y)

int x , y ;

{

if(getpixel(x,y) == 0)

{

putpixel(x,y,RED);

fill_right(++x,y);

x = x - 1 ;

fill_right(x,y-1);

fill_right(x,y+1);

}

}

void fill_left(x,y)

int x , y ;

{

if(getpixel(x,y) == 0)

{

putpixel(x,y,RED);

fill_left(--x,y);

x = x + 1 ;

fill_left(x,y-1);

fill_left(x,y+1);

}

}

void main()

{

int x , y ,a[10][10];

int gd, gm ,n,i;

detectgraph(&gd,&gm);

initgraph(&gd,&gm,"c:\\tc\\bgi");

printf("\n\n\tEnter the no. of edges of polygon : ");

scanf("%d",&n);

printf("\n\n\tEnter the cordinates of polygon :\n\n\n ");

for(i=0;i<n;i++)

{

printf("\tX%d Y%d : ",i,i);

scanf("%d %d",&a[i][0],&a[i][1]);

}

a[n][0]=a[0][0];

a[n][1]=a[0][1];

printf("\n\n\tEnter the seed pt. : ");

scanf("%d%d",&x,&y);

cleardevice();

setcolor(WHITE);

for(i=0;i<n;i++) /*- draw poly -*/

{

line(a[i][0],a[i][1],a[i+1][0],a[i+1][1]);

}

fill_right(x,y);

fill_left(x-1,y);

getch();

}

/*SAMPLE INPUT*/

/*Enter the number of edges of polygon 4

X0 Y0 = 50 50

X1 Y1 = 200 50

X2 Y2 = 200 300

X3 Y3 = 50 300

Enter the seed point 100 100*/

## Tuesday, May 5, 2009

### C Program to Implement Flood Fill Algorithm

Labels: Flood Fill Algorithm

Posted by Angad at 7:43 AM

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## 9 comments:

good work.. thnx, i needed it lyk hell.. :)

fukin a...

thanks.. i realy need it..

can you pls provide its explanation

This is fine, but you risk over flowing the stack. I recommend looking into newer non-recursive methods.

plzzzzzzzz tell me how to fill color in custom created polygon like rectangle made with lines

Great program. I found a simplified program here

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