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@tolokoban/tgd

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ToloGameDev library for WebGL2

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import { tgdCalcClamp, tgdCalcModulo } from "./../utils/index.js"; export class TgdColor { static fromHSL(H, S, L) { const color = new TgdColor(); color.H = H; color.S = S; color.L = L; color.hsl2rgb(); return color; } constructor(r = 0, g = 0, b = 0, a = 1) { /** Red [0..1] */ this._R = 1; /** Green [0..1] */ this._G = 1; /** Blue [0..1] */ this._B = 1; /** Alpha [0..1] */ this._A = 1; /** Hue [0..1] */ this._H = 1; /** Saturation [0..1] */ this._S = 1; /** Lumimance [0..1] */ this._L = 1; if (typeof r === "string") { this.parse(r); } else { this.R = r; this.G = g; this.B = b; this.A = a; } } get R() { return this._R; } set R(v) { this._R = tgdCalcClamp(v, 0, 1); } get G() { return this._G; } set G(v) { this._G = tgdCalcClamp(v, 0, 1); } get B() { return this._B; } set B(v) { this._B = tgdCalcClamp(v, 0, 1); } get A() { return this._A; } set A(v) { this._A = tgdCalcClamp(v, 0, 1); } get H() { return this._H; } set H(v) { this._H = tgdCalcModulo(v, 0, 1); } get S() { return this._S; } set S(v) { this._S = tgdCalcClamp(v, 0, 1); } get L() { return this._L; } set L(v) { this._L = tgdCalcClamp(v, 0, 1); } parse(color) { const context = getContext(); context.clearRect(0, 0, 1, 1); context.fillStyle = color; context.fillRect(0, 0, 1, 1); const bitmap = context.getImageData(0, 0, 1, 1); const [R, G, B, A] = bitmap.data; const w = 1 / 255; this.R = R * w; this.G = G * w; this.B = B * w; this.A = A * w; } toString() { const { R, G, B, A } = this; return `#${hex(R)}${hex(G)}${hex(B)}${hex(A)}`; } rgb2hsl() { const R = this.R; const G = this.G; const B = this.B; const min = Math.min(R, G, B); const max = Math.max(R, G, B); const delta = max - min; this.L = HALF * (max + min); if (delta < EPSILON) { this.H = 0; this.S = 0; } else { this.S = delta / (1 - Math.abs(this.L + this.L - 1)); if (max === R) { this.H = G >= B ? INV_6 * ((G - B) / delta) : INV_6 * ((B - G) / delta); } else if (max === G) { this.H = INV_6 * (VAL_2 + (B - R) / delta); } else { this.H = INV_6 * (VAL_4 + (R - G) / delta); } } return this; } hsl2rgb() { const H = VAL_6 * this.H; const S = this.S; const L = this.L; const chroma = (1 - Math.abs(L + L - 1)) * S; const { R, G, B } = convertToRGB(H, chroma); const shift = L - chroma * HALF; this.R = R + shift; this.G = G + shift; this.B = B + shift; return this; } } const EPSILON = 1e-6; const HALF = 0.5; const VAL_1 = 1; const VAL_2 = 2; const VAL_3 = 3; const VAL_4 = 4; const VAL_5 = 5; const VAL_6 = 6; const INV_6 = 1 / VAL_6; /** * This is an helper function for the method `hsl2rgb()`. * @param H Hue [0..6] * @param chroma Chrominance * @param x */ function convertToRGB(H, chroma) { let R = 0; let G = 0; let B = 0; const x = chroma * (1 - Math.abs((H % VAL_2) - 1)); if (H < VAL_3) { if (H < VAL_1) { R = chroma; G = x; B = 0; } else if (H < VAL_2) { R = x; G = chroma; B = 0; } else { // H == 2. R = 0; G = chroma; B = x; } } else if (H < VAL_4) { R = 0; G = x; B = chroma; } else if (H < VAL_5) { R = x; G = 0; B = chroma; } else { R = chroma; G = 0; B = x; } return { R, G, B }; } function hex(value) { return Math.floor(value * 255) .toString(16) .padStart(2, "0"); } let globalContext = null; function getContext() { if (!globalContext) { const canvas = document.createElement("canvas"); canvas.width = 1; canvas.height = 1; const context = canvas.getContext("2d", { alpha: true, willReadFrequently: true, }); if (!context) throw new Error("Unable to create a 2D context!"); globalContext = context; } return globalContext; } //# 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