73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* SCROLL() function
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*
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* Copyright 1999 David G. Holm <dholm@jsd-llc.com>
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version, with one exception:
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*
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* The exception is that if you link the Harbour Runtime Library (HRL)
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* and/or the Harbour Virtual Machine (HVM) with other files to produce
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* an executable, this does not by itself cause the resulting executable
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* to be covered by the GNU General Public License. Your use of that
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* executable is in no way restricted on account of linking the HRL
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* and/or HVM code into it.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
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* their web site at http://www.gnu.org/).
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*
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*/
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#include "hbapi.h"
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#include "hbapigt.h"
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/* Scrolls a screen region */
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HB_FUNC( SCROLL )
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{
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int iMaxRow = hb_gtMaxRow();
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int iMaxCol = hb_gtMaxCol();
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int iTop = ISNUM( 1 ) ? hb_parni( 1 ) : 0;
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int iLeft = ISNUM( 2 ) ? hb_parni( 2 ) : 0;
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int iBottom = ISNUM( 3 ) ? hb_parni( 3 ) : iMaxRow;
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int iRight = ISNUM( 4 ) ? hb_parni( 4 ) : iMaxCol;
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/* Enforce limits of (0,0) to (MAXROW(),MAXCOL()) */
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if( iTop < 0 ) iTop = 0;
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else if( iTop > iMaxRow ) iTop = iMaxRow;
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if( iLeft < 0 ) iLeft = 0;
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else if( iLeft > iMaxCol ) iLeft = iMaxCol;
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if( iBottom < 0 ) iBottom = 0;
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else if( iBottom > iMaxRow ) iBottom = iMaxRow;
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if( iRight < 0 ) iRight = 0;
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else if( iRight > iMaxCol ) iRight = iMaxCol;
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hb_gtScroll( ( USHORT ) iTop,
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( USHORT ) iLeft,
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( USHORT ) iBottom,
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( USHORT ) iRight,
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ISNUM( 5 ) ? hb_parni( 5 ) : 0,
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ISNUM( 6 ) ? hb_parni( 6 ) : 0 );
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}
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