1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/* This file is part of the GNU plotutils package. Copyright (C) 1995,
1996, 1997, 1998, 1999, 2000, 2005, 2008, Free Software Foundation, Inc.
The GNU plotutils package is free software. You may redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software foundation; either version 2, or (at your
option) any later version.
The GNU plotutils package 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.
You should have received a copy of the GNU General Public License along
with the GNU plotutils package; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin St., Fifth Floor,
Boston, MA 02110-1301, USA. */
/* This is a header file for the XAffText module, which was originally
independent of libplot. The module is in x_afftext.c. It may be used
independently of libplot.
To use the module independently of libplot, simply do not specify
"-DLIBPLOT" at compile time.
The module supplies two external functions, which are generalizations of
the core X11 function XDrawString: XAffDrawRotString and
XAffDrawAffString. They draw, respectively, a rotated text string and
(more generally) a matrix-transformed text string, using a specified
core X font. The rotation angle and transformation matrix are specified
by the user. The matrix is passed as a 4-element array, with the
element ordering convention, and sign conventions, being those of the
Matrix XLFD extension.
`XAffText' is an abbreviation of `X11 affinely transformed text'. The
module was inspired by Alan Richardson's xvertext module for displaying
rotated text strings in X11, using the core X fonts. It works in a
similar way. (It retrieves a bitmap from the X server into an XImage,
transforms the XImage, monochrome pixel by pixel, and sends it back to a
bitmap on the server, for use as a stipple.) But it supports arbitrary
transformation matrices, and pays extra attention to pixel-level
accuracy. It uses integer arithmetic when possible. */
#include <X11/Xlib.h>
#ifdef LIBPLOT
/* Change the names of the two external functions of the module by
prepending "_x_" to them, for consistency with other internal (but
externally visible) X11-related functions in libplot. */
#define XAffDrawAffString _pl_XAffDrawAffString
#define XAffDrawRotString _pl_XAffDrawRotString
#endif
extern int XAffDrawAffString (Display *dpy, Drawable drawable, GC gc, XFontStruct *font, int x, int y, double a[4], const char *text);
extern int XAffDrawRotString (Display *dpy, Drawable drawable, GC gc, XFontStruct *font, int x, int y, double angle, const char *text);
|
