4 * Copyright 1993 Bob Amstadt
11 /**********************************************************************
14 void WINAPI LineDDA16( INT16 nXStart, INT16 nYStart, INT16 nXEnd, INT16 nYEnd,
15 LINEDDAPROC16 callback, LPARAM lParam )
17 LineDDA32( nXStart, nYStart, nXEnd, nYEnd,
18 (LINEDDAPROC32)callback, lParam );
22 /**********************************************************************
23 * LineDDA32 (GDI32.248)
25 BOOL32 WINAPI LineDDA32(INT32 nXStart, INT32 nYStart, INT32 nXEnd, INT32 nYEnd,
26 LINEDDAPROC32 callback, LPARAM lParam )
28 INT32 xadd = 1, yadd = 1;
31 INT32 dx = nXEnd - nXStart;
32 INT32 dy = nYEnd - nYStart;
40 if (dx > dy) { /* line is "more horizontal" */
41 err = 2*dy - dx; erradd = 2*dy - 2*dx;
42 for(cnt = 0;cnt <= dx; cnt++) {
43 callback(nXStart,nYStart,lParam);
52 } else { /* line is "more vertical" */
53 err = 2*dx - dy; erradd = 2*dx - 2*dy;
54 for(cnt = 0;cnt <= dy; cnt++) {
55 callback(nXStart,nYStart,lParam);