-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
1 parent
9fc5f5e
commit 3f3c243
Showing
5 changed files
with
399 additions
and
7 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| import { COLORS } from './defaultcolors.js'; | ||
|
|
||
| export default class ColorValue { | ||
| // [r, g, b, a?] | ||
| constructor(v) { | ||
| if (v.length === 3) | ||
| v = [...v, 1]; | ||
|
|
||
| // always [r, g, b, a] | ||
| this.values = v; | ||
| } | ||
|
|
||
| static parse(v) { | ||
| if (Array.isArray(v)) { | ||
| if (v.length < 3 || v.length > 4) | ||
| throw new Error('expected array [r, g, b, a]'); | ||
|
|
||
| return new ColorValue(v); | ||
| } | ||
|
|
||
| if (typeof v !== 'string') | ||
| throw new Error('expected a string or an array'); | ||
|
|
||
| v = v.trim(); | ||
|
|
||
| if (v.startsWith('#')) | ||
| return new ColorValue(parseHex(v.substring(1))); | ||
| if (v.startsWith('rgb')) | ||
| return new ColorValue(parseRgb(v)); | ||
| if (v.startsWith('hsl')) | ||
| return new ColorValue(parseHsl(v)); | ||
|
|
||
| if (v in COLORS) | ||
| return new ColorValue(COLORS[v]); | ||
|
|
||
| throw new Error('unknown color value ' + v); | ||
| } | ||
|
|
||
| // v needs to be a string | ||
| static mightBeAColor(v) { | ||
| v = v.trim(); | ||
|
|
||
| return v.startsWith('#') | ||
| || v.startsWith('rgb') | ||
| || v.startsWith('hsl') | ||
| || v in COLORS; | ||
| } | ||
|
|
||
| clone() { | ||
| return new ColorValue(this.values.slice()); | ||
| } | ||
|
|
||
| toString() { | ||
| const [r, g, b, a] = this.values; | ||
| return `rgba(${[r, g, b].map(v => Math.round(v)).join(', ')}, ${ | ||
| a.toFixed(3) | ||
| })`; | ||
| } | ||
| } | ||
|
|
||
| // hex without the hash | ||
| function parseHex(hex) { | ||
| if (hex.length !== 3 && hex.length !== 6 && hex.length !== 8) | ||
| throw new Error('unknown hex value ' + hex); | ||
|
|
||
| // Convert 3-character hex to 6-character hex | ||
| if (hex.length === 3) | ||
| hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2]; | ||
|
|
||
| // Parse the hex values | ||
| const r = parseInt(hex.substring(0, 2), 16); | ||
| const g = parseInt(hex.substring(2, 4), 16); | ||
| const b = parseInt(hex.substring(4, 6), 16); | ||
| let a = 255; | ||
|
|
||
| if (hex.length === 8) | ||
| a = parseInt(hex.substring(6, 8), 16); | ||
|
|
||
| return [r, g, b, a / 255]; | ||
| } | ||
|
|
||
| // rgb needs to start with rgb | ||
| function parseRgb(rgb) { | ||
| const rgba = rgb.startsWith('rgba'); | ||
| // remove the function name | ||
| rgb = rgb.substring(3 + rgba); | ||
| if (!rgb.startsWith('(') && !rgb.endsWith(')')) | ||
| throw new Error('invalid rgb function ' + rgb); | ||
|
|
||
| rgb = rgb.substring(1, rgb.length - 1); | ||
| const vals = rgb.split(','); | ||
|
|
||
| if ((rgba && vals.length !== 4) || vals.length !== 3) | ||
| throw new Error('invalid rgb function ' + rgb); | ||
|
|
||
| const r = parseInt(vals[0].trim()); | ||
| const g = parseInt(vals[1].trim()); | ||
| const b = parseInt(vals[2].trim()); | ||
| const a = rgba ? parseFloat(vals[3].trim()) : 1; | ||
|
|
||
| return [r, g, b, a]; | ||
| } | ||
|
|
||
| // hsl needs to start with hsl | ||
| function parseHsl(hsl) { | ||
| const hsla = hsl.startsWith('hsla'); | ||
| // Remove the function name | ||
| hsl = hsl.substring(3 + hsla); | ||
| if (!hsl.startsWith('(') || !hsl.endsWith(')')) | ||
| throw new Error('invalid hsl function ' + hsl); | ||
|
|
||
| hsl = hsl.substring(1, hsl.length - 1); | ||
| let vals = hsl.split(','); | ||
|
|
||
| if ((hsla && vals.length !== 4) || (!hsla && vals.length !== 3)) | ||
| throw new Error('invalid hsl function ' + hsl); | ||
|
|
||
| vals = vals.map(v => v.trim()); | ||
|
|
||
| if (!vals[1].endsWith('%') && !vals[2].endsWith('%')) | ||
| throw new Error('invalid hsl function ' + hsl); | ||
|
|
||
| const h = parseInt(vals[0]); | ||
| const s = parseInt(vals[1].substring(0, vals[1].length - 1)); | ||
| const l = parseInt(vals[2].substring(0, vals[2].length - 1)); | ||
| const a = hsla ? parseFloat(vals[3]) : 1; | ||
|
|
||
| return hslToRgba([h, s, l, a]); | ||
| } | ||
|
|
||
| /// expects [h, s, l, a] | ||
| function hslToRgba(hsla) { | ||
| let [h, s, l, a] = hsla; | ||
|
|
||
| // normalize | ||
| h /= 360; | ||
| s /= 100; | ||
| l /= 100; | ||
|
|
||
| let r, g, b; | ||
| if (s === 0) { | ||
| r = g = b = l; | ||
| } else { | ||
| const q = l < .5 ? l * (1 + s) : l + s - l * s; | ||
| const p = 2 * l - q; | ||
| r = Math.round(hueToRgb(p, q, h + 1 / 3) * 255, 0); | ||
| g = Math.round(hueToRgb(p, q, h) * 255, 0); | ||
| b = Math.round(hueToRgb(p, q, h - 1 / 3) * 255, 0); | ||
| } | ||
|
|
||
| return [r, g, b, a]; | ||
| } | ||
|
|
||
| function hueToRgb(p, q, t) { | ||
| if (t < 0) | ||
| t += 1; | ||
| if (t > 1) | ||
| t -= 1; | ||
|
|
||
| if (t < 1 / 6) | ||
| return p + (q - p) * 6 * t; | ||
| if (t < 1 / 2) | ||
| return q; | ||
| if (t < 2 / 3) | ||
| return p + (q - p) * (2 / 3 - t) * 6; | ||
| return p; | ||
| } |
Oops, something went wrong.