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const levelText = require('./text leveler');
class Color {
/**
* @typedef {object} RGBObject - An object representing a color in RGB format.
* @property {number} r - the red component, in the range [0, 255].
* @property {number} g - the green component, in the range [0, 255].
* @property {number} b - the blue component, in the range [0, 255].
*/
/**
* @typedef {object} HSVObject - An object representing a color in HSV format.
* @property {number} h - hue, in the range [0-359).
* @property {number} s - saturation, in the range [0,1].
* @property {number} v - value, in the range [0,1].
*/
/** @type {RGBObject} */
static get RGB_BLACK () {
return {r: 0, g: 0, b: 0};
}
/** @type {RGBObject} */
static get RGB_WHITE () {
return {r: 255, g: 255, b: 255};
}
/**
* Convert a Scratch decimal color to a hex string, #RRGGBB.
* @param {number} decimal RGB color as a decimal.
* @return {string} RGB color as #RRGGBB hex string.
*/
static decimalToHex (decimal) {
const rgb = this.decimalToRgb(decimal);
const alphaOrNone = rgb.a !== 255
? rgb.a.toString(16)
: '';
const r = levelText(rgb.r.toString(16), 2, '0');
const g = levelText(rgb.g.toString(16), 2, '0');
const b = levelText(rgb.b.toString(16), 2, '0');
return `#${r}${g}${b}${alphaOrNone}`;
}
/**
* Convert a Scratch decimal color to an RGB color object.
* @param {number} decimal RGB color as decimal.
* @return {RGBObject} rgb - {r: red [0,255], g: green [0,255], b: blue [0,255]}.
*/
static decimalToRgb (decimal) {
const alpha = ((decimal >> 24) & 0xFF) !== 0x00;
let r = (decimal >> 16) & 0xFF,
g = (decimal >> 8) & 0xFF,
b = decimal & 0xFF,
a = 0;
if (alpha) {
a = (decimal >> 24) & 0xFF;
r = (decimal >> 16) & 0xFF;
g = (decimal >> 8) & 0xFF;
b = decimal & 0xFF;
}
return {r: r, g: g, b: b, a: 255 - a};
}
/**
* Convert a hex color (e.g., F00, #03F, #0033FF) to an RGB color object.
* @param {!string} hex Hex representation of the color.
* @return {RGBObject} null on failure, or rgb: {r: red [0,255], g: green [0,255], b: blue [0,255]}.
*/
static hexToRgb (hex) {
if (hex.startsWith('#')) {
hex = hex.substring(1);
}
const parsed = parseInt(hex, 16);
if (isNaN(parsed)) {
return null;
}
if (hex.length === 6) {
return {
r: (parsed >> 16) & 0xff,
g: (parsed >> 8) & 0xff,
b: parsed & 0xff
};
} else if (hex.length === 8) {
return {
r: (parsed >> 24) & 0xff,
g: (parsed >> 16) & 0xff,
b: (parsed >> 8) & 0xff,
a: parsed & 0xff
};
} else if (hex.length === 3) {
const r = ((parsed >> 8) & 0xf);
const g = ((parsed >> 4) & 0xf);
const b = parsed & 0xf;
return {
r: (r << 4) | r,
g: (g << 4) | g,
b: (b << 4) | b
};
}
return null;
}
/**
* Convert an RGB color object to a hex color.
* @param {RGBObject} rgb - {r: red [0,255], g: green [0,255], b: blue [0,255]}.
* @return {!string} Hex representation of the color.
*/
static rgbToHex (rgb) {
return Color.decimalToHex(Color.rgbToDecimal(rgb));
}
/**
* Convert an RGB color object to a Scratch decimal color.
* @param {RGBObject} rgb - {r: red [0,255], g: green [0,255], b: blue [0,255]}.
* @return {!number} Number representing the color.
*/
static rgbToDecimal (rgb) {
if (typeof rgb.a === 'number') {
return ((255 - rgb.a) << 24) + (rgb.r << 16) + (rgb.g << 8) + rgb.b;
}
return (rgb.r << 16) + (rgb.g << 8) + rgb.b;
}
/**
* Convert a hex color (e.g., F00, #03F, #0033FF) to a decimal color number.
* @param {!string} hex Hex representation of the color.
* @return {!number} Number representing the color.
*/
static hexToDecimal (hex) {
return Color.rgbToDecimal(Color.hexToRgb(hex));
}
/**
* Convert an HSV color to RGB format.
* @param {HSVObject} hsv - {h: hue [0,360), s: saturation [0,1], v: value [0,1]}
* @return {RGBObject} rgb - {r: red [0,255], g: green [0,255], b: blue [0,255]}.
*/
static hsvToRgb (hsv) {
let h = hsv.h % 360;
if (h < 0) h += 360;
const s = Math.max(0, Math.min(hsv.s, 1));
const v = Math.max(0, Math.min(hsv.v, 1));
const i = Math.floor(h / 60);
const f = (h / 60) - i;
const p = v * (1 - s);
const q = v * (1 - (s * f));
const t = v * (1 - (s * (1 - f)));
let r;
let g;
let b;
switch (i) {
default:
case 0:
r = v;
g = t;
b = p;
break;
case 1:
r = q;
g = v;
b = p;
break;
case 2:
r = p;
g = v;
b = t;
break;
case 3:
r = p;
g = q;
b = v;
break;
case 4:
r = t;
g = p;
b = v;
break;
case 5:
r = v;
g = p;
b = q;
break;
}
return {
r: Math.floor(r * 255),
g: Math.floor(g * 255),
b: Math.floor(b * 255)
};
}
/**
* Convert an RGB color to HSV format.
* @param {RGBObject} rgb - {r: red [0,255], g: green [0,255], b: blue [0,255]}.
* @return {HSVObject} hsv - {h: hue [0,360), s: saturation [0,1], v: value [0,1]}
*/
static rgbToHsv (rgb) {
const r = rgb.r / 255;
const g = rgb.g / 255;
const b = rgb.b / 255;
const x = Math.min(Math.min(r, g), b);
const v = Math.max(Math.max(r, g), b);
// For grays, hue will be arbitrarily reported as zero. Otherwise, calculate
let h = 0;
let s = 0;
if (x !== v) {
const f = (r === x) ? g - b : ((g === x) ? b - r : r - g);
const i = (r === x) ? 3 : ((g === x) ? 5 : 1);
h = ((i - (f / (v - x))) * 60) % 360;
s = (v - x) / v;
}
return {h: h, s: s, v: v};
}
/**
* Linear interpolation between rgb0 and rgb1.
* @param {RGBObject} rgb0 - the color corresponding to fraction1 <= 0.
* @param {RGBObject} rgb1 - the color corresponding to fraction1 >= 1.
* @param {number} fraction1 - the interpolation parameter. If this is 0.5, for example, mix the two colors equally.
* @return {RGBObject} the interpolated color.
*/
static mixRgb (rgb0, rgb1, fraction1) {
if (fraction1 <= 0) return rgb0;
if (fraction1 >= 1) return rgb1;
const fraction0 = 1 - fraction1;
return {
r: (fraction0 * rgb0.r) + (fraction1 * rgb1.r),
g: (fraction0 * rgb0.g) + (fraction1 * rgb1.g),
b: (fraction0 * rgb0.b) + (fraction1 * rgb1.b)
};
}
}
module.exports = Color;
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