1 /* 2 Copyright (c) 1991 - 1994 Heinz W. Werntges. All rights reserved. 3 Distributed by Free Software Foundation, Inc. 4 5 This file is part of HP2xx. 6 7 HP2xx is distributed in the hope that it will be useful, but 8 WITHOUT ANY WARRANTY. No author or distributor accepts responsibility 9 to anyone for the consequences of using it or for whether it serves any 10 particular purpose or works at all, unless he says so in writing. Refer 11 to the GNU General Public License, Version 2 or later, for full details. 12 13 Everyone is granted permission to copy, modify and redistribute 14 HP2xx, but only under the conditions described in the GNU General Public 15 License. A copy of this license is supposed to have been 16 given to you along with HP2xx so you can know your rights and 17 responsibilities. It should be in a file named COPYING. Among other 18 things, the copyright notice and this notice must be preserved on all 19 copies. 20 21 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 22 */ 23 24 #ifndef BRESNHAM_H 25 #define BRESNHAM_H 26 27 /** bresnham.h: Header for Bresenham utility 28 ** 29 ** 1991/01/04 V 1.00 HWW Originating 30 ** 1992/01/12 V 1.01 HWW ANSI prototypes required now 31 **/ 32 33 34 #define BRESENHAM_EOL 0x04 35 #define BRESENHAM_ERR 0xff 36 37 38 typedef struct { 39 int x, y; /* 2d - pseudo device coord */ 40 } DevPt; 41 42 43 DevPt *bresenham_init(DevPt *, DevPt *); 44 int bresenham_next(void); 45 46 #endif /* BRESNHAM_H */ 47