4 * Copyright 1993 Bob Amstadt
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 /**********************************************************************
28 BOOL WINAPI LineDDA(INT nXStart, INT nYStart, INT nXEnd, INT nYEnd,
29 LINEDDAPROC callback, LPARAM lParam )
31 INT xadd = 1, yadd = 1;
34 INT dx = nXEnd - nXStart;
35 INT dy = nYEnd - nYStart;
43 if (dx > dy) { /* line is "more horizontal" */
44 err = 2*dy - dx; erradd = 2*dy - 2*dx;
45 for(cnt = 0;cnt <= dx; cnt++) {
46 callback(nXStart,nYStart,lParam);
55 } else { /* line is "more vertical" */
56 err = 2*dx - dy; erradd = 2*dx - 2*dy;
57 for(cnt = 0;cnt <= dy; cnt++) {
58 callback(nXStart,nYStart,lParam);