Program to implement flood Fill algorithm in C

/*

   Flood Fill Algorithm

   Created by: Pirate

*/

#include<conio.h>

#include<stdio.h>

#include<graphics.h>

#include<dos.h>

void fill_right(int x,int y);

void fill_left(int x,int y);

void main()

{

                int gd=DETECT,gm,n,i,x,y,a[10][10];

                clrscr();

                initgraph(&gd,&gm,"c:\\turboc3\\bgi");

                printf("*** Flood Fill Algorithm ***\n");

                printf("Enter the no. of edges of polygon\t");

                scanf("%d",&n);

                printf("Enter the cordinates of polygon\n");

                for(i=0;i<n;i++)

                {

                                printf("X%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("Enter the seed Point (X,Y)\t");

                scanf("%d%d",&x,&y);

                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();

}

void fill_right(int x,int 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(int x,int 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);

                }

}


Output