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Examples
linedda.c
Go to the documentation of this file.
1
/*
2
* GDI drawing functions.
3
*
4
* Copyright 1993, 1994 Alexandre Julliard
5
* Copyright 1997 Bertho A. Stultiens
6
* 1999 Huw D M Davies
7
*
8
* This library is free software; you can redistribute it and/or
9
* modify it under the terms of the GNU Lesser General Public
10
* License as published by the Free Software Foundation; either
11
* version 2.1 of the License, or (at your option) any later version.
12
*
13
* This library is distributed in the hope that it will be useful,
14
* but WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* Lesser General Public License for more details.
17
*
18
* You should have received a copy of the GNU Lesser General Public
19
* License along with this library; if not, write to the Free Software
20
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
21
*/
22
/*
23
* COPYRIGHT: See COPYING in the top level directory
24
* PROJECT: ReactOS GDI32
25
* PURPOSE: LineDDA Function
26
* FILE: win32ss/gdi/gdi32/objects/linedda.c
27
* PROGRAMER: Steven Edwards
28
* REVISION HISTORY: 2003/11/15 sedwards Created, 2009/04 gschneider Updated
29
* NOTES: Adapted from Wine
30
*/
31
32
#include <precomp.h>
33
34
#include <debug.h>
35
36
/**********************************************************************
37
* LineDDA (GDI32.@)
38
* @implemented
39
*/
40
BOOL
WINAPI
LineDDA
(
INT
nXStart,
INT
nYStart,
INT
nXEnd,
INT
nYEnd,
41
LINEDDAPROC
callback
,
LPARAM
lParam
)
42
{
43
INT
xadd = 1, yadd = 1;
44
INT
err
,erradd;
45
INT
cnt;
46
INT
dx
= nXEnd - nXStart;
47
INT
dy
= nYEnd - nYStart;
48
49
if
(
dx
< 0)
50
{
51
dx
= -
dx
;
52
xadd = -1;
53
}
54
if
(
dy
< 0)
55
{
56
dy
= -
dy
;
57
yadd = -1;
58
}
59
if
(
dx
>
dy
)
/* line is "more horizontal" */
60
{
61
err
= 2*
dy
-
dx
;
62
erradd = 2*
dy
- 2*
dx
;
63
for
(cnt = 0; cnt <
dx
; cnt++)
64
{
65
callback
(nXStart,nYStart,
lParam
);
66
if
(
err
> 0)
67
{
68
nYStart += yadd;
69
err
+= erradd;
70
}
71
else
err
+= 2*
dy
;
72
nXStart += xadd;
73
}
74
}
75
else
/* line is "more vertical" */
76
{
77
err
= 2*
dx
-
dy
;
78
erradd = 2*
dx
- 2*
dy
;
79
for
(cnt = 0; cnt <
dy
; cnt++)
80
{
81
callback
(nXStart,nYStart,
lParam
);
82
if
(
err
> 0)
83
{
84
nXStart += xadd;
85
err
+= erradd;
86
}
87
else
err
+= 2*
dx
;
88
nYStart += yadd;
89
}
90
}
91
return
TRUE
;
92
}
93
lParam
LPARAM lParam
Definition:
combotst.c:139
TRUE
#define TRUE
Definition:
types.h:120
BOOL
unsigned int BOOL
Definition:
ntddk_ex.h:94
LineDDA
BOOL WINAPI LineDDA(INT nXStart, INT nYStart, INT nXEnd, INT nYEnd, LINEDDAPROC callback, LPARAM lParam)
Definition:
linedda.c:40
dy
GLint dy
Definition:
linetemp.h:97
dx
GLint dx
Definition:
linetemp.h:97
callback
static IPrintDialogCallback callback
Definition:
printdlg.c:326
err
#define err(...)
Definition:
reactos_support_code.h:30
INT
int32_t INT
Definition:
typedefs.h:58
LPARAM
LONG_PTR LPARAM
Definition:
windef.h:208
WINAPI
#define WINAPI
Definition:
msvc.h:6
LINEDDAPROC
FARPROC LINEDDAPROC
Definition:
wingdi.h:2906
win32ss
gdi
gdi32
objects
linedda.c
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