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LINE.C
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1992-04-10
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/**
** LINE.C
**
** Copyright (C) 1992, Csaba Biegl
** 820 Stirrup Dr, Nashville, TN, 37221
** csaba@vuse.vanderbilt.edu
**
** This file is distributed under the terms listed in the document
** "copying.cb", available from the author at the address above.
** A copy of "copying.cb" should accompany this file; if not, a copy
** should be available from where this file was obtained. This file
** may not be distributed without a verbatim copy of "copying.cb".
** You should also have received a copy of the GNU General Public
** License along with this program (it is in the file "copying");
** if not, write to the Free Software Foundation, Inc., 675 Mass Ave,
** Cambridge, MA 02139, USA.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**/
#include "grx.h"
#include "libgrx.h"
#include "lineclip.h"
void GrLine(int x1,int y1,int x2,int y2,int c)
{
MOUSE_FLAG;
if(y1 == y2) {
CLIPHLINE(CURC,x1,x2,y1);
MOUSE_BLOCK(CURC,x1,y1,x2,y1);
_GrSetPixRow(PIXEL_ADDR(x1,y1),c,(x2 - x1 + 1));
}
else if(x1 == x2) {
CLIPVLINE(CURC,x1,y1,y2);
MOUSE_BLOCK(CURC,x1,y1,x1,y2);
_GrSetPixColumn(PIXEL_ADDR(x1,y1),c,(y2 - y1 + 1));
}
else {
CLIPLINE(CURC,x1,y1,x2,y2);
MOUSE_BLOCK(CURC,x1,MIN(y1,y2),x2,MAX(y1,y2));
_GrDrawLine(PIXEL_ADDR(x1,y1),c,(x2 - x1),(y2 - y1));
}
MOUSE_UNBLOCK();
}