{"version":3,"file":"delta-e.mjs","sources":["../../../../../../../../node_modules/chroma-js/src/utils/delta-e.js"],"sourcesContent":["import Color from '../Color.js';\nconst { sqrt, pow, min, max, atan2, abs, cos, sin, exp, PI } = Math;\n\nexport default function (a, b, Kl = 1, Kc = 1, Kh = 1) {\n    // Delta E (CIE 2000)\n    // see http://www.brucelindbloom.com/index.html?Eqn_DeltaE_CIE2000.html\n    var rad2deg = function (rad) {\n        return (360 * rad) / (2 * PI);\n    };\n    var deg2rad = function (deg) {\n        return (2 * PI * deg) / 360;\n    };\n    a = new Color(a);\n    b = new Color(b);\n    const [L1, a1, b1] = Array.from(a.lab());\n    const [L2, a2, b2] = Array.from(b.lab());\n    const avgL = (L1 + L2) / 2;\n    const C1 = sqrt(pow(a1, 2) + pow(b1, 2));\n    const C2 = sqrt(pow(a2, 2) + pow(b2, 2));\n    const avgC = (C1 + C2) / 2;\n    const G = 0.5 * (1 - sqrt(pow(avgC, 7) / (pow(avgC, 7) + pow(25, 7))));\n    const a1p = a1 * (1 + G);\n    const a2p = a2 * (1 + G);\n    const C1p = sqrt(pow(a1p, 2) + pow(b1, 2));\n    const C2p = sqrt(pow(a2p, 2) + pow(b2, 2));\n    const avgCp = (C1p + C2p) / 2;\n    const arctan1 = rad2deg(atan2(b1, a1p));\n    const arctan2 = rad2deg(atan2(b2, a2p));\n    const h1p = arctan1 >= 0 ? arctan1 : arctan1 + 360;\n    const h2p = arctan2 >= 0 ? arctan2 : arctan2 + 360;\n    const avgHp =\n        abs(h1p - h2p) > 180 ? (h1p + h2p + 360) / 2 : (h1p + h2p) / 2;\n    const T =\n        1 -\n        0.17 * cos(deg2rad(avgHp - 30)) +\n        0.24 * cos(deg2rad(2 * avgHp)) +\n        0.32 * cos(deg2rad(3 * avgHp + 6)) -\n        0.2 * cos(deg2rad(4 * avgHp - 63));\n    let deltaHp = h2p - h1p;\n    deltaHp =\n        abs(deltaHp) <= 180\n            ? deltaHp\n            : h2p <= h1p\n              ? deltaHp + 360\n              : deltaHp - 360;\n    deltaHp = 2 * sqrt(C1p * C2p) * sin(deg2rad(deltaHp) / 2);\n    const deltaL = L2 - L1;\n    const deltaCp = C2p - C1p;\n    const sl = 1 + (0.015 * pow(avgL - 50, 2)) / sqrt(20 + pow(avgL - 50, 2));\n    const sc = 1 + 0.045 * avgCp;\n    const sh = 1 + 0.015 * avgCp * T;\n    const deltaTheta = 30 * exp(-pow((avgHp - 275) / 25, 2));\n    const Rc = 2 * sqrt(pow(avgCp, 7) / (pow(avgCp, 7) + pow(25, 7)));\n    const Rt = -Rc * sin(2 * deg2rad(deltaTheta));\n    const result = sqrt(\n        pow(deltaL / (Kl * sl), 2) +\n            pow(deltaCp / (Kc * sc), 2) +\n            pow(deltaHp / (Kh * sh), 2) +\n            Rt * (deltaCp / (Kc * sc)) * (deltaHp / (Kh * sh))\n    );\n    return max(0, min(100, 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