Filling a bounded region, Turbo C

A program to fill a bounded region to be implemented in Turbo C, as a practical of Computer Graphics. As input, a point inside the bounded region is given. 


Implementation:
Starting from the given point apply dfs to the points at n,s,e and w.  As the base conditions check whether the color at the given pixel is equal to the boundary. If it is, return. Also even if it is equal to the fill color, return. Sadly I had to program in Turbo C, yes our college still uses that compiler. Here 4 is the fill color.


Function:
// x and y coordinates of point inside
// getmaxcolor() is the color of boundary
// fill the pixel with color 4


dfs(int x, int y) { 
  if (getpixel(x,y)==getmaxcolor() || getpixel(x,y)==4)
      return; 
  putpixel(x,y,4); 
  dfs(x-1,y);
  dfs(x+1,y);
  dfs(x,y-1);
  dfs(x,y+1); 
}



Floodfill implementation using dfs (stack)
Image Source: Wikipedia 


The output is pretty interesting when you use a delay function with it.