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);
}
}
/*!
* Recursive fill using the boundary-fill algorithm. This function should not be called by the
* user.
*
* \param x The x position of the fill (0 to 319).
* \param y The y position of the fill (0 to 199).
* \param color The fill color.
* \param empty_color The color of the area to be filled.
*/
void boundary_fill( int x, int y, byte color, byte empty_color )
{
if( x > SCREEN_HEIGHT || x < 0 ) { return; }
if( y > SCREEN_WIDTH || y < 0 ) { return; }
if( get_pixel(x, y) == empty_color ) {
put_pixel(x, y, color);
boundary_fill( x + 1, y , color, empty_color );
boundary_fill( x , y - 1, color, empty_color );
boundary_fill( x - 1, y , color, empty_color );
boundary_fill( x , y + 1, color, empty_color );
}
}
void main()
{
int x,y,fcolor,bcolor=15;
int gd = DETECT,gm;
initgraph(&gd, &gm,"");
cleardevice();
line(100,200,500,200);
line(100,200,50,250);
line(50,250,150,250);
line(100,200,150,250);
line(150,250,550,250);
line(500,200,550,250);
rectangle(50,250,150,400);
rectangle(150,250,550,400);
circle(100,225,5);
rectangle(350,300,400,400);
boundary_fill(60,260,1,15);
boundary_fill(160,260,12,15);
boundary_fill(101,226,13,15);
boundary_fill(360,320,9,15);
boundary_fill(150,210,3,15);
boundary_fill(80,230,14,15);
getch();
}
/*!
* Calls a recursive fill function using color of target pixel as the empty color.
*
* \param x The x position of the circle's center (0 to 319).
* \param y The y position of the circle's center (0 to 199).
* \param color The color of the circle.
*/
void fill(int x, int y, byte color)
{
byte far *VGA = MK_FP( 0xA000, 0x0000 );
boundary_fill( x, y, color, VGA[y * SCREEN_WIDTH + x] );
}
