This repository has been archived by the owner on Mar 3, 2023. It is now read-only.
/
color.js
142 lines (117 loc) · 2.86 KB
/
color.js
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
let ParsedColor = null;
// Essential: A simple color class returned from {Config::get} when the value
// at the key path is of type 'color'.
module.exports = class Color {
// Essential: Parse a {String} or {Object} into a {Color}.
//
// * `value` A {String} such as `'white'`, `#ff00ff`, or
// `'rgba(255, 15, 60, .75)'` or an {Object} with `red`, `green`, `blue`,
// and `alpha` properties.
//
// Returns a {Color} or `null` if it cannot be parsed.
static parse(value) {
switch (typeof value) {
case 'string':
break;
case 'object':
if (Array.isArray(value)) {
return null;
}
break;
default:
return null;
}
if (!ParsedColor) {
ParsedColor = require('color');
}
try {
var parsedColor = new ParsedColor(value);
} catch (error) {
return null;
}
return new Color(
parsedColor.red(),
parsedColor.green(),
parsedColor.blue(),
parsedColor.alpha()
);
}
constructor(red, green, blue, alpha) {
this.red = red;
this.green = green;
this.blue = blue;
this.alpha = alpha;
}
set red(red) {
this._red = parseColor(red);
}
set green(green) {
this._green = parseColor(green);
}
set blue(blue) {
this._blue = parseColor(blue);
}
set alpha(alpha) {
this._alpha = parseAlpha(alpha);
}
get red() {
return this._red;
}
get green() {
return this._green;
}
get blue() {
return this._blue;
}
get alpha() {
return this._alpha;
}
// Essential: Returns a {String} in the form `'#abcdef'`.
toHexString() {
return `#${numberToHexString(this.red)}${numberToHexString(
this.green
)}${numberToHexString(this.blue)}`;
}
// Essential: Returns a {String} in the form `'rgba(25, 50, 75, .9)'`.
toRGBAString() {
return `rgba(${this.red}, ${this.green}, ${this.blue}, ${this.alpha})`;
}
toJSON() {
return this.alpha === 1 ? this.toHexString() : this.toRGBAString();
}
toString() {
return this.toRGBAString();
}
isEqual(color) {
if (this === color) {
return true;
}
if (!(color instanceof Color)) {
color = Color.parse(color);
}
if (color == null) {
return false;
}
return (
color.red === this.red &&
color.blue === this.blue &&
color.green === this.green &&
color.alpha === this.alpha
);
}
clone() {
return new Color(this.red, this.green, this.blue, this.alpha);
}
};
function parseColor(colorString) {
const color = parseInt(colorString, 10);
return isNaN(color) ? 0 : Math.min(Math.max(color, 0), 255);
}
function parseAlpha(alphaString) {
const alpha = parseFloat(alphaString);
return isNaN(alpha) ? 1 : Math.min(Math.max(alpha, 0), 1);
}
function numberToHexString(number) {
const hex = number.toString(16);
return number < 16 ? `0${hex}` : hex;
}