eg_setap.c

开放源码的编译器open watcom 1.6.0版的源代码

#include <conio.h>
#include <graph.h>

main()
{
    int old_apage;
    int old_vpage;

    _setvideomode( _HRES16COLOR );
    old_apage = _getactivepage();
    old_vpage = _getvisualpage();
    /* draw an ellipse on page 0 */
    _setactivepage( 0 );
    _setvisualpage( 0 );
    _ellipse( _GFILLINTERIOR, 100, 50, 540, 150 );
    /* draw a rectangle on page 1 */
    _setactivepage( 1 );
    _rectangle( _GFILLINTERIOR, 100, 50, 540, 150 );
    getch();
    /* display page 1 */
    _setvisualpage( 1 );
    getch();
    _setactivepage( old_apage );
    _setvisualpage( old_vpage );
    _setvideomode( _DEFAULTMODE );
}