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32 lines
1.2 KiB
32 lines
1.2 KiB
1 year ago
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import {tickStep} from "d3-array";
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import {format, formatPrefix, formatSpecifier, precisionFixed, precisionPrefix, precisionRound} from "d3-format";
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export default function(domain, count, specifier) {
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var start = domain[0],
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stop = domain[domain.length - 1],
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step = tickStep(start, stop, count == null ? 10 : count),
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precision;
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specifier = formatSpecifier(specifier == null ? ",f" : specifier);
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switch (specifier.type) {
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case "s": {
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var value = Math.max(Math.abs(start), Math.abs(stop));
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if (specifier.precision == null && !isNaN(precision = precisionPrefix(step, value))) specifier.precision = precision;
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return formatPrefix(specifier, value);
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}
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case "":
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case "e":
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case "g":
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case "p":
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case "r": {
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if (specifier.precision == null && !isNaN(precision = precisionRound(step, Math.max(Math.abs(start), Math.abs(stop))))) specifier.precision = precision - (specifier.type === "e");
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break;
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}
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case "f":
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case "%": {
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if (specifier.precision == null && !isNaN(precision = precisionFixed(step))) specifier.precision = precision - (specifier.type === "%") * 2;
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break;
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}
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}
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return format(specifier);
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}
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