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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
#include "sys-defines.h"
#include "extern.h"
#define ONEBYTE 0xff
#define REGIS_NUM_STD_COLORS 8
/* standard ReGIS colors */
const plColor _regis_stdcolors[REGIS_NUM_STD_COLORS] =
{
{0xff, 0x00, 0x00}, /* Red */
{0x00, 0xff, 0x00}, /* Green */
{0x00, 0x00, 0xff}, /* Blue */
{0x00, 0xff, 0xff}, /* Cyan */
{0xff, 0x00, 0xff}, /* Magenta */
{0xff, 0xff, 0x00}, /* Yellow */
{0x00, 0x00, 0x00}, /* Black */
{0xff, 0xff, 0xff} /* White */
};
/* corresponding one-letter abbreviations (in same order as preceding) */
const char _regis_color_chars[REGIS_NUM_STD_COLORS] =
{ 'r', 'g', 'b', 'c', 'm', 'y', 'd', 'w' };
/* forward references */
static int _rgb_to_stdcolor ____P((plColor rgb));
void
#ifdef _HAVE_PROTOS
_r_set_pen_color(S___(Plotter *_plotter))
#else
_r_set_pen_color(S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
int new_color;
new_color = _rgb_to_stdcolor (_plotter->drawstate->fgcolor);
if (_plotter->regis_fgcolor_is_unknown
|| _plotter->regis_fgcolor != new_color)
{
char tmpbuf[32];
sprintf (tmpbuf, "W(I(%c))\n",
_regis_color_chars[new_color]);
_write_string (_plotter->data, tmpbuf);
_plotter->regis_fgcolor = new_color;
_plotter->regis_fgcolor_is_unknown = false;
}
}
void
#ifdef _HAVE_PROTOS
_r_set_fill_color(S___(Plotter *_plotter))
#else
_r_set_fill_color(S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
int new_color;
/* sanity check */
if (_plotter->drawstate->fill_type == 0)
return;
new_color = _rgb_to_stdcolor (_plotter->drawstate->fillcolor);
if (_plotter->regis_fgcolor_is_unknown
|| _plotter->regis_fgcolor != new_color)
{
char tmpbuf[32];
sprintf (tmpbuf, "W(I(%c))\n",
_regis_color_chars[new_color]);
_write_string (_plotter->data, tmpbuf);
_plotter->regis_fgcolor = new_color;
_plotter->regis_fgcolor_is_unknown = false;
}
}
void
#ifdef _HAVE_PROTOS
_r_set_bg_color(S___(Plotter *_plotter))
#else
_r_set_bg_color(S___(_plotter))
S___(Plotter *_plotter;)
#endif
{
int new_color;
new_color = _rgb_to_stdcolor (_plotter->drawstate->bgcolor);
if (_plotter->regis_bgcolor_is_unknown
|| _plotter->regis_bgcolor != new_color)
{
char tmpbuf[32];
sprintf (tmpbuf, "S(I(%c))\n",
_regis_color_chars[new_color]);
_write_string (_plotter->data, tmpbuf);
_plotter->regis_bgcolor = new_color;
_plotter->regis_bgcolor_is_unknown = false;
/* note: must do an erase, for the just-set background color to show
up on the ReGIS display */
}
}
/* compute best approximation, in color table, to a specified 48-bit color */
static int
#ifdef _HAVE_PROTOS
_rgb_to_stdcolor (plColor rgb)
#else
_rgb_to_stdcolor (rgb)
plColor rgb;
#endif
{
int red, green, blue;
unsigned long int difference = INT_MAX;
int i, best = 0; /* keep compiler happy */
/* convert from 48-bit color to 24-bit */
red = rgb.red;
green = rgb.green;
blue = rgb.blue;
red = (red >> 8) & ONEBYTE;
green = (green >> 8) & ONEBYTE;
blue = (blue >> 8) & ONEBYTE;
for (i = 0; i < REGIS_NUM_STD_COLORS; i++)
{
unsigned long int newdifference;
newdifference = (((_regis_stdcolors[i].red - red)
* (_regis_stdcolors[i].red - red))
+ ((_regis_stdcolors[i].green - green)
* (_regis_stdcolors[i].green - green))
+ ((_regis_stdcolors[i].blue - blue)
* (_regis_stdcolors[i].blue - blue)));
if (newdifference < difference)
{
difference = newdifference;
best = i;
}
}
return best;
}
|
