GRASS GIS 8 Programmer's Manual  8.4.0dev(2024)-6c790bf5c0
named_colr.c
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1 #include <grass/gis.h>
2 #include <string.h>
3 #include <stdio.h>
4 
5 static struct {
6  const char *name;
7  float r, g, b;
8 } colors[] = {
9  {"white", 1.00, 1.00, 1.00}, {"black", 0.00, 0.00, 0.00},
10  {"red", 1.00, 0.00, 0.00}, {"green", 0.00, 1.00, 0.00},
11  {"blue", 0.00, 0.00, 1.00}, {"yellow", 1.00, 1.00, 0.00},
12  {"magenta", 1.00, 0.00, 1.00}, {"cyan", 0.00, 1.00, 1.00},
13  {"aqua", 0.00, 0.75, 0.75}, {"grey", 0.75, 0.75, 0.75},
14  {"gray", 0.75, 0.75, 0.75}, {"orange", 1.00, 0.50, 0.00},
15  {"brown", 0.75, 0.50, 0.25}, {"purple", 0.50, 0.00, 1.00},
16  {"violet", 0.50, 0.00, 1.00}, {"indigo", 0.00, 0.50, 1.00},
17  {"", 0.00, 0.00, 0.00} /* do not modify this line */
18 };
19 
20 int G_color_values(const char *name, float *r, float *g, float *b)
21 {
22  int i;
23 
24  *r = *g = *b = 0.0;
25  for (i = 0; colors[i].name[0]; i++)
26  if (strcmp(name, colors[i].name) == 0) {
27  *r = colors[i].r;
28  *g = colors[i].g;
29  *b = colors[i].b;
30  return 1;
31  }
32  return -1;
33 }
34 
35 const char *G_color_name(int n)
36 {
37  int i;
38 
39  if (n >= 0)
40  for (i = 0; colors[i].name[0]; i++)
41  if (i == n)
42  return colors[i].name;
43  return NULL;
44 }
#define NULL
Definition: ccmath.h:32
int G_color_values(const char *name, float *r, float *g, float *b)
Definition: named_colr.c:20
float r
Definition: named_colr.c:7
float b
Definition: named_colr.c:7
float g
Definition: named_colr.c:7
const char * name
Definition: named_colr.c:6
const char * G_color_name(int n)
Definition: named_colr.c:35