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─────Run-Time Library───────────────────────────────────────────────────────
 
/* ANIMATE.C illustrates animation functions including:
 *      _getimage       _putimage                                 (DOS-only)
 *      _imagesize      _grstatus
 */
 
#include <conio.h>
#include <stddef.h>
#include <stdlib.h>
#include <malloc.h>
#include <graph.h>
 
short action[5]  = { _GPSET,   _GPRESET, _GXOR,    _GOR,     _GAND     };
char *descrip[5] = {  "PSET  ", "PRESET", "XOR   ", "OR    ", "AND   " };
 
void exitfree( char __huge *buffer );
 
void main()
{
    char  __huge *buffer;
    long  imsize;
    short i, x, y = 30;
 
    if( !_setvideomode( _MAXRESMODE ) )
        exit( 1 );
 
    /* Measure the image to be drawn and allocate memory for it. */
    imsize = _imagesize( -16, -16, +16, +16 );
    buffer = _halloc( imsize, 1 );
    if( buffer == NULL )
        exit( 1 );
 
    _setcolor( 3 );
    for ( i = 0; i < 5; i++ )
    {
        /* Draw ellipse at new position and get a copy of it. */
        x = 50; y += 40;
        _ellipse( _GFILLINTERIOR, x - 15, y - 15, x + 15, y + 15 );
        _getimage( x - 16, y - 16, x + 16, y + 16, buffer );
        if( _grstatus() )
            exitfree( buffer );        /* Quit on error                   */
 
        /* Display action type and copy a row of ellipses with that type. */
        _settextposition( 1, 1 );
        _outtext( descrip[i] );
        while( x < 260 )
        {
            x += 5;
            _putimage( x - 16, y - 16, buffer, action[i] );
            if( _grstatus() < 0 )      /* Ignore warnings, quit on errors */
                exitfree( buffer );
        }
        _getch();
    }
    exitfree( buffer );
}
 
void exitfree( char __huge *buffer )
{
    _hfree( buffer );
    exit( !_setvideomode( _DEFAULTMODE ) );
}
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