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{"version":3,"file":"browser.js","sources":["index.js"],"sourcesContent":["const tinycolor = require('tinycolor2');\n\n/**\n * @typedef {Object} TinyGradient.StopInput\n * @property {ColorInput} color\n * @property {number} pos\n */\n\n/**\n * @typedef {Object} TinyGradient.StepValue\n * @type {number} [r]\n * @type {number} [g]\n * @type {number} [b]\n * @type {number} [h]\n * @type {number} [s]\n * @type {number} [v]\n * @type {number} [a]\n */\n\n/**\n * @type {StepValue}\n */\nconst RGBA_MAX = { r: 256, g: 256, b: 256, a: 1 };\n\n/**\n * @type {StepValue}\n */\nconst HSVA_MAX = { h: 360, s: 1, v: 1, a: 1 };\n\n/**\n * Linearly compute the step size between start and end (not normalized)\n * @param {StepValue} start\n * @param {StepValue} end\n * @param {number} steps - number of desired steps\n * @return {StepValue}\n */\nfunction stepize(start, end, steps) {\n let step = {};\n\n for (let k in start) {\n if (start.hasOwnProperty(k)) {\n step[k] = steps === 0 ? 0 : (end[k] - start[k]) / steps;\n }\n }\n\n return step;\n}\n\n/**\n * Compute the final step color\n * @param {StepValue} step - from `stepize`\n * @param {StepValue} start\n * @param {number} i - color index\n * @param {StepValue} max - rgba or hsva of maximum values for each channel\n * @return {StepValue}\n */\nfunction interpolate(step, start, i, max) {\n let color = {};\n\n for (let k in start) {\n if (start.hasOwnProperty(k)) {\n color[k] = step[k] * i + start[k];\n color[k] = color[k] < 0 ? color[k] + max[k] : (max[k] !== 1 ? color[k] % max[k] : color[k]);\n }\n }\n\n return color;\n}\n\n/**\n * Generate gradient with RGBa interpolation\n * @param {StopInput} stop1\n * @param {StopInput} stop2\n * @param {number} steps\n * @return {tinycolor[]} color1 included, color2 excluded\n */\nfunction interpolateRgb(stop1, stop2, steps) {\n const start = stop1.color.toRgb();\n const end = stop2.color.toRgb();\n const step = stepize(start, end, steps);\n let gradient = [stop1.color];\n\n for (let i = 1; i < steps; i++) {\n const color = interpolate(step, start, i, RGBA_MAX);\n gradient.push(tinycolor(color));\n }\n\n return gradient;\n}\n\n/**\n * Generate gradient with HSVa interpolation\n * @param {StopInput} stop1\n * @param {StopInput} stop2\n * @param {number} steps\n * @param {boolean|'long'|'short'} mode\n * @return {tinycolor[]} color1 included, color2 excluded\n */\nfunction interpolateHsv(stop1, stop2, steps, mode) {\n const start = stop1.color.toHsv();\n const end = stop2.color.toHsv();\n\n // rgb interpolation if one of the steps in grayscale\n if (start.s === 0 || end.s === 0) {\n return interpolateRgb(stop1, stop2, steps);\n }\n\n let trigonometric;\n if (typeof mode === 'boolean') {\n trigonometric = mode;\n }\n else {\n const trigShortest = (start.h < end.h && end.h - start.h < 180) || (start.h > end.h && start.h - end.h > 180);\n trigonometric = (mode === 'long' && trigShortest) || (mode === 'short' && !trigShortest);\n }\n\n const step = stepize(start, end, steps);\n let gradient = [stop1.color];\n\n // recompute hue\n let diff;\n if ((start.h <= end.h && !trigonometric) || (start.h >= end.h && trigonometric)) {\n diff = end.h - start.h;\n }\n else if (trigonometric) {\n diff = 360 - end.h + start.h;\n }\n else {\n diff = 360 - start.h + end.h;\n }\n step.h = Math.pow(-1, trigonometric ? 1 : 0) * Math.abs(diff) / steps;\n\n for (let i = 1; i < steps; i++) {\n const color = interpolate(step, start, i, HSVA_MAX);\n gradient.push(tinycolor(color));\n }\n\n return gradient;\n}\n\n/**\n * Compute substeps between each stops\n * @param {StopInput[]} stops\n * @param {number} steps\n * @return {number[]}\n */\nfunction computeSubsteps(stops, steps) {\n const l = stops.length;\n\n // validation\n steps = parseInt(steps, 10);\n\n if (isNaN(steps) || steps < 2) {\n throw new Error('Invalid number of steps (< 2)');\n }\n if (steps < l) {\n throw new Error('Number of steps cannot be inferior to number of stops');\n }\n\n // compute substeps from stop positions\n let substeps = [];\n\n for (let i = 1; i < l; i++) {\n const step = (steps - 1) * (stops[i].pos - stops[i - 1].pos);\n substeps.push(Math.max(1, Math.round(step)));\n }\n\n // adjust number of steps\n let totalSubsteps = 1;\n for (let n = l - 1; n--;) totalSubsteps += substeps[n];\n\n while (totalSubsteps !== steps) {\n if (totalSubsteps < steps) {\n const min = Math.min.apply(null, substeps);\n substeps[substeps.indexOf(min)]++;\n totalSubsteps++;\n }\n else {\n const max = Math.max.apply(null, substeps);\n substeps[substeps.indexOf(max)]--;\n totalSubsteps--;\n }\n }\n\n return substeps;\n}\n\n/**\n * Compute the color at a specific position\n * @param {StopInput[]} stops\n * @param {number} pos\n * @param {string} method\n * @param {StepValue} max\n * @returns {tinycolor}\n */\nfunction computeAt(stops, pos, method, max) {\n if (pos < 0 || pos > 1) {\n throw new Error('Position must be between 0 and 1');\n }\n\n let start, end;\n for (let i = 0, l = stops.length; i < l - 1; i++) {\n if (pos >= stops[i].pos && pos < stops[i + 1].pos) {\n start = stops[i];\n end = stops[i + 1];\n break;\n }\n }\n\n if (!start) {\n start = end = stops[stops.length - 1];\n }\n\n const step = stepize(start.color[method](), end.color[method](), (end.pos - start.pos) * 100);\n const color = interpolate(step, start.color[method](), (pos - start.pos) * 100, max);\n return tinycolor(color);\n}\n\nclass TinyGradient {\n /**\n * @param {StopInput[]|ColorInput[]} stops\n * @returns {TinyGradient}\n */\n constructor(stops) {\n // validation\n if (stops.length < 2) {\n throw new Error('Invalid number of stops (< 2)');\n }\n\n const havingPositions = stops[0].pos !== undefined;\n let l = stops.length;\n let p = -1;\n let lastColorLess = false;\n // create tinycolor objects and clean positions\n this.stops = stops.map((stop, i) => {\n const hasPosition = stop.pos !== undefined;\n if (havingPositions ^ hasPosition) {\n throw new Error('Cannot mix positionned and not posionned color stops');\n }\n\n if (hasPosition) {\n const hasColor = stop.color !== undefined;\n if (!hasColor && (lastColorLess || i === 0 || i === l - 1)) {\n throw new Error('Cannot define two consecutive position-only stops');\n }\n lastColorLess = !hasColor;\n\n stop = {\n color : hasColor ? tinycolor(stop.color) : null,\n colorLess: !hasColor,\n pos : stop.pos\n };\n\n if (stop.pos < 0 || stop.pos > 1) {\n throw new Error('Color stops positions must be between 0 and 1');\n }\n else if (stop.pos < p) {\n throw new Error('Color stops positions are not ordered');\n }\n p = stop.pos;\n }\n else {\n stop = {\n color: tinycolor(stop.color !== undefined ? stop.color : stop),\n pos : i / (l - 1)\n };\n }\n\n return stop;\n });\n\n if (this.stops[0].pos !== 0) {\n this.stops.unshift({\n color: this.stops[0].color,\n pos : 0\n });\n l++;\n }\n if (this.stops[l - 1].pos !== 1) {\n this.stops.push({\n color: this.stops[l - 1].color,\n pos : 1\n });\n }\n }\n\n /**\n * Return new instance with reversed stops\n * @return {TinyGradient}\n */\n reverse() {\n let stops = [];\n\n this.stops.forEach(function (stop) {\n stops.push({\n color: stop.color,\n pos : 1 - stop.pos\n });\n });\n\n return new TinyGradient(stops.reverse());\n }\n\n /**\n * Return new instance with looped stops\n * @return {TinyGradient}\n */\n loop() {\n let stops1 = [];\n let stops2 = [];\n\n this.stops.forEach((stop) => {\n stops1.push({\n color: stop.color,\n pos : stop.pos / 2\n });\n });\n\n this.stops.slice(0, -1).forEach((stop) => {\n stops2.push({\n color: stop.color,\n pos : 1 - stop.pos / 2\n });\n });\n\n return new TinyGradient(stops1.concat(stops2.reverse()));\n }\n\n /**\n * Generate gradient with RGBa interpolation\n * @param {number} steps\n * @return {tinycolor[]}\n */\n rgb(steps) {\n const substeps = computeSubsteps(this.stops, steps);\n let gradient = [];\n\n this.stops.forEach((stop, i) => {\n if (stop.colorLess) {\n stop.color = interpolateRgb(this.stops[i - 1], this.stops[i + 1], 2)[1];\n }\n });\n\n for (let i = 0, l = this.stops.length; i < l - 1; i++) {\n const rgb = interpolateRgb(this.stops[i], this.stops[i + 1], substeps[i]);\n gradient.splice(gradient.length, 0, ...rgb);\n }\n\n gradient.push(this.stops[this.stops.length - 1].color);\n\n return gradient;\n }\n\n /**\n * Generate gradient with HSVa interpolation\n * @param {number} steps\n * @param {boolean|'long'|'short'} [mode=false]\n * - false to step in clockwise\n * - true to step in trigonometric order\n * - 'short' to use the shortest way\n * - 'long' to use the longest way\n * @return {tinycolor[]}\n */\n hsv(steps, mode) {\n const substeps = computeSubsteps(this.stops, steps);\n let gradient = [];\n\n this.stops.forEach((stop, i) => {\n if (stop.colorLess) {\n stop.color = interpolateHsv(this.stops[i - 1], this.stops[i + 1], 2, mode)[1];\n }\n });\n\n for (let i = 0, l = this.stops.length; i < l - 1; i++) {\n const hsv = interpolateHsv(this.stops[i], this.stops[i + 1], substeps[i], mode);\n gradient.splice(gradient.length, 0, ...hsv);\n }\n\n gradient.push(this.stops[this.stops.length - 1].color);\n\n return gradient;\n }\n\n /**\n * Generate CSS3 command (no prefix) for this gradient\n * @param {String} [mode=linear] - 'linear' or 'radial'\n * @param {String} [direction] - default is 'to right' or 'ellipse at center'\n * @return {String}\n */\n css(mode, direction) {\n mode = mode || 'linear';\n direction = direction || (mode === 'linear' ? 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