import “../arrays/map”; import “../arrays/range”; import “scale”;
d3.scale.ordinal = function() {
return d3_scale_ordinal([], {t: "range", a: [[]]});
};
function d3_scale_ordinal(domain, ranger) {
var index, range, rangeBand; function scale(x) { return range[((index.get(x) || index.set(x, domain.push(x))) - 1) % range.length]; } function steps(start, step) { return d3.range(domain.length).map(function(i) { return start + step * i; }); } scale.domain = function(x) { if (!arguments.length) return domain; domain = []; index = new d3_Map; var i = -1, n = x.length, xi; while (++i < n) if (!index.has(xi = x[i])) index.set(xi, domain.push(xi)); return scale[ranger.t].apply(scale, ranger.a); }; scale.range = function(x) { if (!arguments.length) return range; range = x; rangeBand = 0; ranger = {t: "range", a: arguments}; return scale; }; scale.rangePoints = function(x, padding) { if (arguments.length < 2) padding = 0; var start = x[0], stop = x[1], step = (stop - start) / (Math.max(1, domain.length - 1) + padding); range = steps(domain.length < 2 ? (start + stop) / 2 : start + step * padding / 2, step); rangeBand = 0; ranger = {t: "rangePoints", a: arguments}; return scale; }; scale.rangeBands = function(x, padding, outerPadding) { if (arguments.length < 2) padding = 0; if (arguments.length < 3) outerPadding = padding; var reverse = x[1] < x[0], start = x[reverse - 0], stop = x[1 - reverse], step = (stop - start) / (domain.length - padding + 2 * outerPadding); range = steps(start + step * outerPadding, step); if (reverse) range.reverse(); rangeBand = step * (1 - padding); ranger = {t: "rangeBands", a: arguments}; return scale; }; scale.rangeRoundBands = function(x, padding, outerPadding) { if (arguments.length < 2) padding = 0; if (arguments.length < 3) outerPadding = padding; var reverse = x[1] < x[0], start = x[reverse - 0], stop = x[1 - reverse], step = Math.floor((stop - start) / (domain.length - padding + 2 * outerPadding)), error = stop - start - (domain.length - padding) * step; range = steps(start + Math.round(error / 2), step); if (reverse) range.reverse(); rangeBand = Math.round(step * (1 - padding)); ranger = {t: "rangeRoundBands", a: arguments}; return scale; }; scale.rangeBand = function() { return rangeBand; }; scale.rangeExtent = function() { return d3_scaleExtent(ranger.a[0]); }; scale.copy = function() { return d3_scale_ordinal(domain, ranger); }; return scale.domain(domain);
}