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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
| #include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define ETAPE 2 /* choisis au hasard */
typedef struct
{
unsigned char r; /* red */
unsigned char g; /* green */
unsigned char b; /* blue */
unsigned char dummy; /* alignment */
} color;
int calculerCouleur (color const *color1, color const *color2,
color ** tabColor, int etape);
int main (void)
{
int ret = EXIT_FAILURE;
color *tabColor = NULL; /* tableau contenant les couleurs intermédiaires */
color color1 = { 153, 255, 0 };
color color2 = { 204, 102, 204 };
if (calculerCouleur (&color1, &color2, &tabColor, ETAPE))
{
int i;
for (i = 0; i < ETAPE + 2; i++)
{
printf ("rgb(%hhu,%hhu,%hhu)\n", tabColor[i].r, tabColor[i].g,
tabColor[i].b);
}
ret = EXIT_SUCCESS;
}
return ret;
}
int calculerCouleur (color const *color1, color const *color2,
color ** tabColor, int step)
{
int ret = 0;
color pattern;
step++;
pattern.r =
(unsigned char) floor ((color2->r - color1->r) / (double) step + 0.5);
pattern.g =
(unsigned char) floor ((color2->g - color1->g) / (double) step + 0.5);
pattern.b =
(unsigned char) floor ((color2->b - color1->b) / (double) step + 0.5);
*tabColor = malloc ((step + 1) * sizeof **tabColor);
if (*tabColor != NULL)
{
color *tab = *tabColor;
int i = 0;
tab[0] = *color1;
tab[step] = *color2;
for (i = 1; i < step; i++)
{
tab[i].r = (unsigned char) (color1->r + pattern.r * i);
tab[i].g = (unsigned char) (color1->g + pattern.g * i);
tab[i].b = (unsigned char) (color1->b + pattern.b * i);
}
ret = 1;
}
return ret;
} |
