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LuisSevillano/scale.js

Created January 4, 2021 19:06
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Invert d3 scaleBand
Raw
scale.js
// https://github.com/d3/d3-scale/blob/11777dac7d4b0b3e229d658aee3257ea67bd5ffa/src/band.js#L32
x.invert = function(_) {
const scale = this;
const domain = scale.domain;
const paddingOuter = scale.paddingOuter();
const paddingInner = scale.paddingInner();
const step = scale.step();
const range = scale.range();
var domainIndex,
n = domain().length,
reverse = range[1] < range[0],
start = range[reverse - 0],
stop = range[1 - reverse];
if (_ < start + paddingOuter * step) domainIndex = 0;
else if (_ > stop - paddingOuter * step) domainIndex = n - 1;
else domainIndex = Math.floor((_ - start - paddingOuter * step) / step);
return domain()[domainIndex];
};
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