| 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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245 |
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
9×
1×
8×
8×
1×
372×
135×
237×
237×
1×
1×
1×
1×
1×
12×
12×
2×
10×
10×
10×
10×
12×
1×
10×
10×
10×
10×
4×
4×
4×
4×
4×
4×
4×
1×
1×
1×
4×
4×
4×
4×
6×
3×
3×
3×
3×
3×
3×
3×
3×
3×
3×
3×
3×
1×
16×
1×
8×
8×
8×
8×
8×
8×
1×
240×
240×
1×
240×
240×
1×
240×
240×
1×
240×
240×
| // We can't use goog.color or goog.color.alpha because they interally use a hex
// string representation that encodes each channel in a single byte. This
// causes occasional loss of precision and rounding errors, especially in the
// alpha channel.
goog.provide('ol.Color');
goog.provide('ol.color');
goog.require('goog.asserts');
goog.require('goog.color');
goog.require('goog.color.names');
goog.require('ol');
goog.require('ol.math');
/**
* A color represented as a short array [red, green, blue, alpha].
* red, green, and blue should be integers in the range 0..255 inclusive.
* alpha should be a float in the range 0..1 inclusive. If no alpha value is
* given then `1` will be used.
* @typedef {Array.<number>}
* @api
*/
ol.Color;
/**
* This RegExp matches # followed by 3 or 6 hex digits.
* @const
* @type {RegExp}
* @private
*/
ol.color.hexColorRe_ = /^#(?:[0-9a-f]{3}){1,2}$/i;
/**
* @see goog.color.rgbColorRe_
* @const
* @type {RegExp}
* @private
*/
ol.color.rgbColorRe_ =
/^(?:rgb)?\((0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2})\)$/i;
/**
* @see goog.color.alpha.rgbaColorRe_
* @const
* @type {RegExp}
* @private
*/
ol.color.rgbaColorRe_ =
/^(?:rgba)?\((0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|1|0\.\d{0,10})\)$/i;
/**
* Return the color as an array. This function maintains a cache of calculated
* arrays which means the result should not be modified.
* @param {ol.Color|string} color Color.
* @return {ol.Color} Color.
* @api
*/
ol.color.asArray = function(color) {
if (goog.isArray(color)) {
return color;
} else {
goog.asserts.assert(typeof color === 'string', 'Color should be a string');
return ol.color.fromString(color);
}
};
/**
* Return the color as an rgba string.
* @param {ol.Color|string} color Color.
* @return {string} Rgba string.
* @api
*/
ol.color.asString = function(color) {
if (typeof color === 'string') {
return color;
} else {
goog.asserts.assert(goog.isArray(color), 'Color should be an array');
return ol.color.toString(color);
}
};
/**
* @param {string} s String.
* @return {ol.Color} Color.
*/
ol.color.fromString = (
function() {
// We maintain a small cache of parsed strings. To provide cheap LRU-like
// semantics, whenever the cache grows too large we simply delete an
// arbitrary 25% of the entries.
/**
* @const
* @type {number}
*/
var MAX_CACHE_SIZE = 1024;
/**
* @type {Object.<string, ol.Color>}
*/
var cache = {};
/**
* @type {number}
*/
var cacheSize = 0;
return (
/**
* @param {string} s String.
* @return {ol.Color} Color.
*/
function(s) {
var color;
if (cache.hasOwnProperty(s)) {
color = cache[s];
} else {
Iif (cacheSize >= MAX_CACHE_SIZE) {
var i = 0;
var key;
for (key in cache) {
if ((i++ & 3) === 0) {
delete cache[key];
--cacheSize;
}
}
}
color = ol.color.fromStringInternal_(s);
cache[s] = color;
++cacheSize;
}
return color;
});
})();
/**
* @param {string} s String.
* @private
* @return {ol.Color} Color.
*/
ol.color.fromStringInternal_ = function(s) {
var isHex = false;
Iif (ol.ENABLE_NAMED_COLORS && goog.color.names.hasOwnProperty(s)) {
s = goog.color.names[s];
isHex = true;
}
var r, g, b, a, color, match;
if (isHex || (match = ol.color.hexColorRe_.exec(s))) { // hex
var n = s.length - 1; // number of hex digits
goog.asserts.assert(n == 3 || n == 6,
'Color string length should be 3 or 6');
var d = n == 3 ? 1 : 2; // number of digits per channel
r = parseInt(s.substr(1 + 0 * d, d), 16);
g = parseInt(s.substr(1 + 1 * d, d), 16);
b = parseInt(s.substr(1 + 2 * d, d), 16);
if (d == 1) {
r = (r << 4) + r;
g = (g << 4) + g;
b = (b << 4) + b;
}
a = 1;
color = [r, g, b, a];
goog.asserts.assert(ol.color.isValid(color),
'Color should be a valid color');
return color;
} else if ((match = ol.color.rgbaColorRe_.exec(s))) { // rgba()
r = Number(match[1]);
g = Number(match[2]);
b = Number(match[3]);
a = Number(match[4]);
color = [r, g, b, a];
return ol.color.normalize(color, color);
} else Eif ((match = ol.color.rgbColorRe_.exec(s))) { // rgb()
r = Number(match[1]);
g = Number(match[2]);
b = Number(match[3]);
color = [r, g, b, 1];
return ol.color.normalize(color, color);
} else {
goog.asserts.fail(s + ' is not a valid color');
}
};
/**
* @param {ol.Color} color Color.
* @return {boolean} Is valid.
*/
ol.color.isValid = function(color) {
return 0 <= color[0] && color[0] < 256 &&
0 <= color[1] && color[1] < 256 &&
0 <= color[2] && color[2] < 256 &&
0 <= color[3] && color[3] <= 1;
};
/**
* @param {ol.Color} color Color.
* @param {ol.Color=} opt_color Color.
* @return {ol.Color} Clamped color.
*/
ol.color.normalize = function(color, opt_color) {
var result = opt_color || [];
result[0] = ol.math.clamp((color[0] + 0.5) | 0, 0, 255);
result[1] = ol.math.clamp((color[1] + 0.5) | 0, 0, 255);
result[2] = ol.math.clamp((color[2] + 0.5) | 0, 0, 255);
result[3] = ol.math.clamp(color[3], 0, 1);
return result;
};
/**
* @param {ol.Color} color Color.
* @return {string} String.
*/
ol.color.toString = function(color) {
var r = color[0];
if (r != (r | 0)) {
r = (r + 0.5) | 0;
}
var g = color[1];
if (g != (g | 0)) {
g = (g + 0.5) | 0;
}
var b = color[2];
if (b != (b | 0)) {
b = (b + 0.5) | 0;
}
var a = color[3] === undefined ? 1 : color[3];
return 'rgba(' + r + ',' + g + ',' + b + ',' + a + ')';
};
|