@tldraw/utils/dist-esm/lib/number.mjs.map

tldraw infinite canvas SDK (private utilities).

{
  "version": 3,
  "sources": ["../../src/lib/number.ts"],
  "sourcesContent": ["/**\n * Linear interpolate between two values.\n *\n * @param a - The start value\n * @param b - The end value\n * @param t - The interpolation factor (0-1)\n * @returns The interpolated value\n * @example\n * ```ts\n * const halfway = lerp(0, 100, 0.5) // 50\n * const quarter = lerp(10, 20, 0.25) // 12.5\n * ```\n * @public\n */\nexport function lerp(a: number, b: number, t: number) {\n\treturn a + (b - a) * t\n}\n\n/**\n * Inverse lerp between two values. Given a value `t` in the range [a, b], returns a number between\n * 0 and 1.\n *\n * @param a - The start value of the range\n * @param b - The end value of the range\n * @param t - The value within the range [a, b]\n * @returns The normalized position (0-1) of t within the range [a, b]\n * @example\n * ```ts\n * const position = invLerp(0, 100, 25) // 0.25\n * const normalized = invLerp(10, 20, 15) // 0.5\n * ```\n * @public\n */\nexport function invLerp(a: number, b: number, t: number) {\n\treturn (t - a) / (b - a)\n}\n\n/**\n * Seeded random number generator, using [xorshift](https://en.wikipedia.org/wiki/Xorshift). The\n * result will always be between -1 and 1.\n *\n * Adapted from [seedrandom](https://github.com/davidbau/seedrandom).\n *\n * @param seed - The seed string for deterministic random generation (defaults to empty string)\n * @returns A function that will return a random number between -1 and 1 each time it is called\n * @example\n * ```ts\n * const random = rng('my-seed')\n * const num1 = random() // Always the same for this seed\n * const num2 = random() // Next number in sequence\n *\n * // Different seed produces different sequence\n * const otherRandom = rng('other-seed')\n * const different = otherRandom() // Different value\n * ```\n * @public\n */\nexport function rng(seed = '') {\n\tlet x = 0\n\tlet y = 0\n\tlet z = 0\n\tlet w = 0\n\n\tfunction next() {\n\t\tconst t = x ^ (x << 11)\n\t\tx = y\n\t\ty = z\n\t\tz = w\n\t\tw ^= ((w >>> 19) ^ t ^ (t >>> 8)) >>> 0\n\t\treturn (w / 0x100000000) * 2\n\t}\n\n\tfor (let k = 0; k < seed.length + 64; k++) {\n\t\tx ^= seed.charCodeAt(k) | 0\n\t\tnext()\n\t}\n\n\treturn next\n}\n\n/**\n * Modulate a value between two ranges.\n *\n * @example\n *\n * ```ts\n * const A = modulate(0, [0, 1], [0, 100])\n * ```\n *\n * @param value - The interpolation value.\n * @param rangeA - From [low, high]\n * @param rangeB - To [low, high]\n * @param clamp - Whether to clamp the the result to [low, high]\n * @public\n */\nexport function modulate(value: number, rangeA: number[], rangeB: number[], clamp = false): number {\n\tconst [fromLow, fromHigh] = rangeA\n\tconst [v0, v1] = rangeB\n\tconst result = v0 + ((value - fromLow) / (fromHigh - fromLow)) * (v1 - v0)\n\n\treturn clamp\n\t\t? v0 < v1\n\t\t\t? Math.max(Math.min(result, v1), v0)\n\t\t\t: Math.max(Math.min(result, v0), v1)\n\t\t: result\n}\n"],
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