Fill an area of a display using the current color and fill mask.
#include <graph.h>
short __far _floodfill( short x, short y, short boundary );
short __far _floodfill_w( double wx, double wy, short boundary );
| x, y | Start point | |
| wx, wy | Start point | |
| boundary | Boundary color of area to be filled |
The functions in the _floodfill family fill an area of the display, using the current color and fill mask. The _floodfill routine begins filling at the view-coordinate point (x, y). The _floodfill_w routine begins filling at the window-coordinate point (wx, wy).
If this point lies inside the figure, the interior is filled; if it lies outside the figure, the background is filled. The point must be inside or outside the figure to be filled, not on the figure boundary itself. Filling occurs in all directions, stopping at the color of boundary.
The _floodfill functions return a nonzero value if the fill is successful. They return 0 if the fill could not be completed, the starting point lies on the boundary color, or the start point lies outside the clipping region.
Standards:None
16-Bit:DOS
32-Bit:None
_ellipse functions, _getcolor, _getfillmask, _grstatus, _pie functions, _setfillmask, _setcliprgn, _setcolor
/* FLOODFIL.C: This program draws a series of nested rectangles in
* different colors, constantly changing the background color.
*/
#include <conio.h>
#include <stdlib.h>
#include <graph.h>
void main( void )
{
int loop;
int xvar, yvar;
/* find a valid graphics mode */
if( !_setvideomode( _MAXCOLORMODE ) )
exit( 1 );
for( xvar = 163, loop = 0; xvar < 320; loop++, xvar += 3 )
{
_setcolor( loop % 16 );
yvar = xvar * 5 / 8;
_rectangle( _GBORDER, 320-xvar, 200-yvar, xvar, yvar );
_floodfill( 0, 0, loop % 16 );
}
_getch();
_setvideomode( _DEFAULTMODE );
}