/*Boundry Fill Algorithm in Computer graphics with output*/

Boundry Fill Algorithm

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

void boundary_fill(int x, int y, int fcolor, int bcolor)

{

    if ((getpixel(x, y) != fcolor) && (getpixel(x, y) != bcolor)) {

       putpixel(x, y, fcolor);

       boundary_fill(x + 1, y, fcolor, bcolor);

       boundary_fill(x - 1, y, fcolor, bcolor);

       boundary_fill(x, y - 1, fcolor, bcolor);

       boundary_fill(x, y + 1, fcolor, bcolor);

       boundary_fill(x + 1, y - 1, fcolor, bcolor);

       boundary_fill(x + 1, y + 1, fcolor, bcolor);

       boundary_fill(x - 1, y - 1, fcolor, bcolor);

       boundary_fill(x - 1, y + 1, fcolor, bcolor);

    }

}

void main()

{

    int x, y, fcolor, bcolor;

    clrscr();

    printf("Enter the seed point (x,y) : ");

    scanf("%d%d", &x, &y);

    printf("Enter boundary color : ");

    scanf("%d", &bcolor);

    printf("Enter new color : ");

    scanf("%d", &fcolor);

    int gd = DETECT, gm = DETECT;

    initgraph(&gd, &gm, "");

    cleardevice();

    boundary_fill(x, y, fcolor, bcolor);

    getch();

}

Output: