GRASS GIS 8 Programmer's Manual  8.4.0dev(2024)-55b2a2bccc
htmldriver/graph_set.c
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1 /*
2  * Start up graphics processing. Anything that needs to be assigned, set up,
3  * started-up, or otherwise initialized happens here. This is called only at
4  * the startup of the graphics driver.
5  *
6  * The external variables define the pixle limits of the graphics surface. The
7  * coordinate system used by the applications programs has the (0,0) origin
8  * in the upper left-hand corner. Hence,
9  * screen_left < screen_right
10  * screen_top < screen_bottom
11  *
12  */
13 
14 #include <string.h>
15 #include <stdlib.h>
16 
17 #include <grass/gis.h>
18 #include <grass/glocale.h>
19 
20 #include "driverlib.h"
21 #include "driver.h"
22 #include "htmlmap.h"
23 
24 struct html_state html;
25 
26 int HTML_Graph_set(void)
27 {
28  char *file_name;
29  char *p;
30 
31  G_gisinit("HTMLMAP driver");
32 
33  /*
34  * set the minimum bounding box dimensions
35  */
36 
37  if (NULL != (p = getenv("GRASS_RENDER_HTMLMINBBOX"))) {
38  html.BBOX_MINIMUM = atoi(p);
39  if (html.BBOX_MINIMUM <= 0) {
41  }
42  }
43  else {
45  }
46 
47  /*
48  * set the maximum number of points
49  */
50 
51  if (NULL != (p = getenv("GRASS_RENDER_HTMLMAXPOINTS"))) {
52  html.MAX_POINTS = atoi(p);
53  if (html.MAX_POINTS <= 0) {
55  }
56  }
57  else {
59  }
60 
61  /*
62  * set the minimum difference to keep a point
63  */
64 
65  if (NULL != (p = getenv("GRASS_RENDER_HTMLMINDIST"))) {
66  html.MINIMUM_DIST = atoi(p);
67  if (html.MINIMUM_DIST <= 0) {
69  }
70  }
71  else {
73  }
74 
75  /*
76  * open the output file
77  */
78 
79  if (NULL != (p = getenv("GRASS_RENDER_FILE"))) {
80  if (strlen(p) == 0) {
81  p = FILE_NAME;
82  }
83  }
84  else {
85  p = FILE_NAME;
86  }
87  file_name = p;
88 
89  html.output = fopen(file_name, "w");
90  if (html.output == NULL) {
91  G_fatal_error("HTMLMAP: couldn't open output file %s", file_name);
92  exit(EXIT_FAILURE);
93  }
94 
95  G_verbose_message(_("html: collecting to file '%s'"), file_name);
96  G_verbose_message(_("html: image size %dx%d"), screen_width, screen_height);
97 
98  /*
99  * check type of map wanted
100  */
101 
102  if (NULL == (p = getenv("GRASS_RENDER_HTMLTYPE"))) {
103  p = "CLIENT";
104  }
105 
106  if (strcmp(p, "APACHE") == 0) {
107  html.type = APACHE;
108  G_verbose_message(_("html: type '%s'"), "apache");
109  }
110  else if (strcmp(p, "RAW") == 0) {
111  html.type = RAW;
112  G_verbose_message(_("html: type '%s'"), "raw");
113  }
114  else {
115  html.type = CLIENT;
116  G_verbose_message(_("html: type '%s'"), "client");
117  }
118 
119  /*
120  * initialize text memory and list pointers
121  */
122 
123  html.last_text = (char *)G_malloc(INITIAL_TEXT + 1);
124  html.last_text[0] = '\0';
126 
127  html.head = NULL;
128  html.tail = &html.head;
129 
130  return 0;
131 }
#define NULL
Definition: ccmath.h:32
void void void void G_fatal_error(const char *,...) __attribute__((format(printf
#define G_malloc(n)
Definition: defs/gis.h:94
void void G_verbose_message(const char *,...) __attribute__((format(printf
int screen_height
Definition: driver/init.c:30
int screen_width
Definition: driver/init.c:29
#define G_gisinit(pgm)
Definition: gis.h:72
#define _(str)
Definition: glocale.h:10
int HTML_Graph_set(void)
struct html_state html
#define DEF_MAXPTS
Definition: htmlmap.h:6
#define DEF_MINDIST
Definition: htmlmap.h:5
#define INITIAL_TEXT
Definition: htmlmap.h:10
#define RAW
Definition: htmlmap.h:15
#define FILE_NAME
Definition: htmlmap.h:8
#define APACHE
Definition: htmlmap.h:12
#define DEF_MINBBOX
Definition: htmlmap.h:4
#define CLIENT
Definition: htmlmap.h:14
int MAX_POINTS
Definition: htmlmap.h:32
int type
Definition: htmlmap.h:28
struct MapPoly * head
Definition: htmlmap.h:30
char * last_text
Definition: htmlmap.h:26
int last_text_len
Definition: htmlmap.h:27
struct MapPoly ** tail
Definition: htmlmap.h:31
FILE * output
Definition: htmlmap.h:29
int MINIMUM_DIST
Definition: htmlmap.h:34
int BBOX_MINIMUM
Definition: htmlmap.h:33