1 line
12 KiB
JSON
1 line
12 KiB
JSON
{"ast":null,"code":"import { bisect } from \"d3-array\";\nimport { interpolate as interpolateValue, interpolateNumber, interpolateRound } from \"d3-interpolate\";\nimport constant from \"./constant.js\";\nimport number from \"./number.js\";\nvar unit = [0, 1];\nexport function identity(x) {\n return x;\n}\nfunction normalize(a, b) {\n return (b -= a = +a) ? function (x) {\n return (x - a) / b;\n } : constant(isNaN(b) ? NaN : 0.5);\n}\nfunction clamper(a, b) {\n var t;\n if (a > b) t = a, a = b, b = t;\n return function (x) {\n return Math.max(a, Math.min(b, x));\n };\n}\n\n// normalize(a, b)(x) takes a domain value x in [a,b] and returns the corresponding parameter t in [0,1].\n// interpolate(a, b)(t) takes a parameter t in [0,1] and returns the corresponding range value x in [a,b].\nfunction bimap(domain, range, interpolate) {\n var d0 = domain[0],\n d1 = domain[1],\n r0 = range[0],\n r1 = range[1];\n if (d1 < d0) d0 = normalize(d1, d0), r0 = interpolate(r1, r0);else d0 = normalize(d0, d1), r0 = interpolate(r0, r1);\n return function (x) {\n return r0(d0(x));\n };\n}\nfunction polymap(domain, range, interpolate) {\n var j = Math.min(domain.length, range.length) - 1,\n d = new Array(j),\n r = new Array(j),\n i = -1;\n\n // Reverse descending domains.\n if (domain[j] < domain[0]) {\n domain = domain.slice().reverse();\n range = range.slice().reverse();\n }\n while (++i < j) {\n d[i] = normalize(domain[i], domain[i + 1]);\n r[i] = interpolate(range[i], range[i + 1]);\n }\n return function (x) {\n var i = bisect(domain, x, 1, j) - 1;\n return r[i](d[i](x));\n };\n}\nexport function copy(source, target) {\n return target.domain(source.domain()).range(source.range()).interpolate(source.interpolate()).clamp(source.clamp()).unknown(source.unknown());\n}\nexport function transformer() {\n var domain = unit,\n range = unit,\n interpolate = interpolateValue,\n transform,\n untransform,\n unknown,\n clamp = identity,\n piecewise,\n output,\n input;\n function rescale() {\n var n = Math.min(domain.length, range.length);\n if (clamp !== identity) clamp = clamper(domain[0], domain[n - 1]);\n piecewise = n > 2 ? polymap : bimap;\n output = input = null;\n return scale;\n }\n function scale(x) {\n return x == null || isNaN(x = +x) ? unknown : (output || (output = piecewise(domain.map(transform), range, interpolate)))(transform(clamp(x)));\n }\n scale.invert = function (y) {\n return clamp(untransform((input || (input = piecewise(range, domain.map(transform), interpolateNumber)))(y)));\n };\n scale.domain = function (_) {\n return arguments.length ? 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