GRASS GIS 8 Programmer's Manual  8.2.2dev(2023)-3d37ee165c
cairodriver/line_width.c
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1 /*!
2  \file lib/cairodriver/line_width.c
3 
4  \brief GRASS cairo display driver - set line width
5 
6  (C) 2007-2008 by Lars Ahlzen and the GRASS Development Team
7 
8  This program is free software under the GNU General Public License
9  (>=v2). Read the file COPYING that comes with GRASS for details.
10 
11  \author Lars Ahlzen <lars ahlzen.com> (original contibutor)
12  \author Glynn Clements
13 */
14 
15 #include <grass/gis.h>
16 #include "cairodriver.h"
17 
18 #define MIN_WIDTH 1
19 
20 static double previous_width = -1;
21 
22 /*!
23  \brief Set line width
24 
25  \param width line width (double precision)
26 */
27 void Cairo_Line_width(double width)
28 {
29  G_debug(1, "Cairo_Line_width: %f", width);
30 
31  width = MAX(MIN_WIDTH, width);
32  if (width != previous_width)
33  cairo_set_line_width(cairo, width);
34 
35  return;
36 }
void Cairo_Line_width(double width)
Set line width.
cairo_t * cairo
#define MIN_WIDTH
#define MAX(a, b)
Definition: gis.h:135
GRASS cairo display driver - header file.
int G_debug(int, const char *,...) __attribute__((format(printf