home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Cream of the Crop 1
/
Cream of the Crop 1.iso
/
PROGRAM
/
CBGRX100.ARJ
/
P8LINE.C
< prev
next >
Wrap
Text File
|
1992-04-10
|
2KB
|
50 lines
/**
** P8LINE.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 "p8.h"
#include "bytedraw.h"
void _GrP8DrawLine(long addr,int color,int deltax,int deltay)
{
pixptr p = P_ADDRESS(CURC,addr);
int skip = CURC->gc_lineoffset;
int oper = C_OPER(color);
if((_GrP8DrawTable[oper] ^ (color &= C_SIGNIF)) == 0) return;
if(deltay < 0) { deltay = (-deltay), skip = (-skip); }
_ClrDir();
if(deltax > deltay) switch(oper) {
case C_XOR: _DrawXLineXor(p,skip,deltax,deltay,color); break;
case C_OR: _DrawXLineOr(p,skip,deltax,deltay,color); break;
case C_AND: _DrawXLineAnd(p,skip,deltax,deltay,color); break;
default: _DrawXLine(p,skip,deltax,deltay,color); break;
}
else switch(oper) {
case C_XOR: _DrawYLineXor(p,skip,deltax,deltay,color); break;
case C_OR: _DrawYLineOr(p,skip,deltax,deltay,color); break;
case C_AND: _DrawYLineAnd(p,skip,deltax,deltay,color); break;
default: _DrawYLine(p,skip,deltax,deltay,color); break;
}
}