Article: Q65590
Product(s): See article
Version(s): 6.00
Operating System(s): MS-DOS
Keyword(s): ENDUSER | s_quickc | mspl13_c
Last Modified: 24-SEP-1990
The sample code below draws two circles that are cut in half with a
line. There is a small gap (2 pixels) in the line. When _floodfill()
is used to fill the circle with a solid color, it fills the entire
circle. When _floodfill() is used to fill the circle with a pattern,
it fills only half of the circle.
In this instance, the two-pixel gap in the line corresponds to the gap
in the fill pattern. This causes _floodfill() to treat it as a solid
line and fill only half the circle.
To fill the entire circle with the pattern, create a second
_floodfill() with a point on the other side of the line, as in the
commented section of the code below:
Sample Code
-----------
#include <conio.h>
#include <graph.h>
#include <time.h>
#include <stdlib.h>
#include <stddef.h>
void main(void)
{
unsigned char fill[] = {0x88,0x22,0x88,0x22,0x88,0x22,0x88,0x22};
if( !_setvideomode( _MAXRESMODE ) )
exit(1);
_setfillmask( NULL ); /* Fill circle with a solid color */
_setcolor(2);
_ellipse( _GBORDER, 50, 100, 250, 300 );
getch();
_moveto( 50, 200 );
_lineto( 248,200 ); /* Line with a 2 pixel gap */
getch();
_setcolor(4);
_floodfill( 100, 210, 2); /* Fill the circle with a solid color */
getch();
_setfillmask( fill ); /* Fill circle with a pattern */
_setcolor(2);
_ellipse( _GBORDER, 350, 100, 550, 300 );
getch();
_moveto( 350, 200 );
_lineto( 548, 200 ); /* Line with a 2 pixel gap */
getch();
_setcolor(4);
_floodfill( 400, 210, 2); /* Fill half of the circle with a pattern */
/* _floodfill( 400, 180, 2); This _floodfill() will fill in the other */
/* half of the circle with a pattern. */
getch();
_setvideomode( _DEFAULTMODE );
}