Draw ellipses.
#include <graph.h>
short __far _ellipse( short control, short x1, short y1, short x2, short y2 );
short __far _ellipse_w( short control, double wx1, double wy1, double wx2,
double wy2 );
short __far _ellipse_wxy( short control, struct _wxycoord __far *pwxy1,
struct _wxycoord __far *pwxy2 );
| control | Fill flag | |
| x1, y1 | Upper-left corner of bounding rectangle | |
| x2, y2 | Lower-right corner of bounding rectangle | |
| wx1, wy1 | Upper-left corner of bounding rectangle | |
| wx2, wy2 | Lower-right corner of bounding rectangle | |
| pwxy1 | Upper-left corner of bounding rectangle | |
| pwxy2 | Lower-right corner of bounding rectangle |
The _ellipse functions draw ellipses or circles. The borders are drawn in the current color. In the _ellipse function, the center of the ellipse is the center of the bounding rectangle defined by the view-coordinate points (x1, y1) and (x2, y2).
In the _ellipse_w function, the center of the ellipse is the center of the bounding rectangle defined by the window-coordinate points (wx1, wy1) and (wx2, wy2).
In the _ellipse_wxy function, the center of the ellipse is the center of the bounding rectangle defined by the window-coordinate points (pwxy1) and (pwxy2).
If the bounding-rectangle arguments define a point or a vertical or horizontal line, no figure is drawn.
The control argument can be one of the following manifest constants:
| Constant | Action |
| _GFILLINTERIOR | Uses _floodfill to fill the ellipse using the current fill mask |
| _GBORDER | Does not fill the ellipse |
The control option given by _GFILLINTERIOR is equivalent to a subsequent call to the _floodfill function, using the center of the ellipse as the starting point and the current color (set by _setcolor) as the boundary color.
The _ellipse functions return a nonzero value if the ellipse is drawn successfully; otherwise, they return 0.
Standards:None
16-Bit:DOS
32-Bit:None
_arc functions, _floodfill, _grstatus, _lineto functions, _pie functions, _polygon functions, _rectangle functions, _setcolor, _setfillmask
/* ELLIPSE.C: This program draws a simple ellipse. */
#include <conio.h>
#include <stdlib.h>
#include <graph.h>
void main( void )
{
/* Find a valid graphics mode. */
if( !_setvideomode( _MAXRESMODE ) )
exit( 1 );
_ellipse( _GFILLINTERIOR, 80, 50, 240, 150 );
/* Strike any key to clear screen. */
_getch();
_setvideomode( _DEFAULTMODE );
}