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21 KiB
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1 line
21 KiB
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{"ast":null,"code":"import { bound01, pad2 } from './util.js';\n// `rgbToHsl`, `rgbToHsv`, `hslToRgb`, `hsvToRgb` modified from:\n// <http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript>\n/**\n * Handle bounds / percentage checking to conform to CSS color spec\n * <http://www.w3.org/TR/css3-color/>\n * *Assumes:* r, g, b in [0, 255] or [0, 1]\n * *Returns:* { r, g, b } in [0, 255]\n */\nexport function rgbToRgb(r, g, b) {\n return {\n r: bound01(r, 255) * 255,\n g: bound01(g, 255) * 255,\n b: bound01(b, 255) * 255\n };\n}\n/**\n * Converts an RGB color value to HSL.\n * *Assumes:* r, g, and b are contained in [0, 255] or [0, 1]\n * *Returns:* { h, s, l } in [0,1]\n */\nexport function rgbToHsl(r, g, b) {\n r = bound01(r, 255);\n g = bound01(g, 255);\n b = bound01(b, 255);\n var max = Math.max(r, g, b);\n var min = Math.min(r, g, b);\n var h = 0;\n var s = 0;\n var l = (max + min) / 2;\n if (max === min) {\n s = 0;\n h = 0; // achromatic\n } else {\n var d = max - min;\n s = l > 0.5 ? d / (2 - max - min) : d / (max + min);\n switch (max) {\n case r:\n h = (g - b) / d + (g < b ? 6 : 0);\n break;\n case g:\n h = (b - r) / d + 2;\n break;\n case b:\n h = (r - g) / d + 4;\n break;\n default:\n break;\n }\n h /= 6;\n }\n return {\n h: h,\n s: s,\n l: l\n };\n}\nfunction hue2rgb(p, q, t) {\n if (t < 0) {\n t += 1;\n }\n if (t > 1) {\n t -= 1;\n }\n if (t < 1 / 6) {\n return p + (q - p) * (6 * t);\n }\n if (t < 1 / 2) {\n return q;\n }\n if (t < 2 / 3) {\n return p + (q - p) * (2 / 3 - t) * 6;\n }\n return p;\n}\n/**\n * Converts an HSL color value to RGB.\n *\n * *Assumes:* h is contained in [0, 1] or [0, 360] and s and l are contained [0, 1] or [0, 100]\n * *Returns:* { r, g, b } in the set [0, 255]\n */\nexport function hslToRgb(h, s, l) {\n var r;\n var g;\n var b;\n h = bound01(h, 360);\n s = bound01(s, 100);\n l = bound01(l, 100);\n if (s === 0) {\n // achromatic\n g = l;\n b = l;\n r = l;\n } else {\n var q = l < 0.5 ? l * (1 + s) : l + s - l * s;\n var p = 2 * l - q;\n r = hue2rgb(p, q, h + 1 / 3);\n g = hue2rgb(p, q, h);\n b = hue2rgb(p, q, h - 1 / 3);\n }\n return {\n r: r * 255,\n g: g * 255,\n b: b * 255\n };\n}\n/**\n * Converts an RGB color value to HSV\n *\n * *Assumes:* r, g, and b are contained in the set [0, 255] or [0, 1]\n * *Returns:* { h, s, v } in [0,1]\n */\nexport function rgbToHsv(r, g, b) {\n r = bound01(r, 255);\n g = bound01(g, 255);\n b = bound01(b, 255);\n var max = Math.max(r, g, b);\n var min = Math.min(r, g, b);\n var h = 0;\n var v = max;\n var d = max - min;\n var s = max === 0 ? 0 : d / max;\n if (max === min) {\n h = 0; // achromatic\n } else {\n switch (max) {\n case r:\n h = (g - b) / d + (g < b ? 6 : 0);\n break;\n case g:\n h = (b - r) / d + 2;\n break;\n case b:\n h = (r - g) / d + 4;\n break;\n default:\n break;\n }\n h /= 6;\n }\n return {\n h: h,\n s: s,\n v: v\n };\n}\n/**\n * Converts an HSV color value to RGB.\n *\n * *Assumes:* h is contained in [0, 1] or [0, 360] and s and v are contained in [0, 1] or [0, 100]\n * *Returns:* { r, g, b } in the set [0, 255]\n */\nexport function hsvToRgb(h, s, v) {\n h = bound01(h, 360) * 6;\n s = bound01(s, 100);\n v = bound01(v, 100);\n var i = Math.floor(h);\n var f = h - i;\n var p = v * (1 - s);\n var q = v * (1 - f * s);\n var t = v * (1 - (1 - f) * s);\n var mod = i % 6;\n var r = [v, q, p, p, t, v][mod];\n var g = [t, v, v, q, p, p][mod];\n var b = [p, p, t, v, v, q][mod];\n return {\n r: r * 255,\n g: g * 255,\n b: b * 255\n };\n}\n/**\n * Converts an RGB color to hex\n *\n * Assumes r, g, and b are contained in the set [0, 255]\n * Returns a 3 or 6 character hex\n */\nexport function rgbToHex(r, g, b, allow3Char) {\n var hex = [pad2(Math.round(r).toString(16)), pad2(
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