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92 lines (79 loc) · 2.68 KB
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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) || ranger.t === "range" && 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);
}