toolkit/javascript/d3/src/core/uninterpolate.js
author Nicolas Sauret <nicolas.sauret@iri.centrepompidou.fr>
Thu, 10 Apr 2014 14:20:23 +0200
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function d3_uninterpolateNumber(a, b) {
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  b = b - (a = +a) ? 1 / (b - a) : 0;
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  return function(x) { return (x - a) * b; };
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}
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function d3_uninterpolateClamp(a, b) {
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  b = b - (a = +a) ? 1 / (b - a) : 0;
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  return function(x) { return Math.max(0, Math.min(1, (x - a) * b)); };
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}