Question

write a program to draw Pentagon and fill it with red color using boundary fill algorithm with 8 connected method​

Answer 1

Answer:

Alogrithm

void boundaryFill4(int x, int y, int fill_color,int boundary_color)

{

   if(getpixel(x, y) != boundary_color &&

      getpixel(x, y) != fill_color)

   {

       putpixel(x, y, fill_color);

       boundaryFill4(x + 1, y, fill_color, boundary_color);

       boundaryFill4(x, y + 1, fill_color, boundary_color);

       boundaryFill4(x - 1, y, fill_color, boundary_color);

       boundaryFill4(x, y - 1, fill_color, boundary_color);

   }

}

 

Program

#include<graphics.h>

#include<dos.h>  

#include<conio.h>    

void boundaryFill8(int x, int y, int fill_color,int boundary_color)  

{  

   if(getpixel(x, y) != boundary_color &&  

      getpixel(x, y) != fill_color)  

   {  

       putpixel(x, y, fill_color);  

       boundaryFill8(x + 1, y, fill_color, boundary_color);  

       boundaryFill8(x, y + 1, fill_color, boundary_color);  

       boundaryFill8(x - 1, y, fill_color, boundary_color);  

       boundaryFill8(x, y - 1, fill_color, boundary_color);  

       boundaryFill8(x - 1, y - 1, fill_color, boundary_color);  

       boundaryFill8(x - 1, y + 1, fill_color, boundary_color);  

       boundaryFill8(x + 1, y - 1, fill_color, boundary_color);  

       boundaryFill8(x + 1, y + 1, fill_color, boundary_color);  

   }  

}  

void main()  

{  

   int gd = DETECT, gm;  

   initgraph(&gd, &gm, "c:\\Turboc3\\bgi");    

   // Rectangle function  

   rectangle(50, 50, 100, 100);    

   // Function calling  

   boundaryFill8(55, 55, 4, 15);    

   delay(10000);    

   getch();    

/*closegraph function closes the graphics mode and deallocates all memory allocated by graphics system .*/  

   closegraph();  

}  

Output