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80 lines
2.3 KiB
80 lines
2.3 KiB
import constant from "./constant";
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import descending from "./descending";
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import identity from "./identity";
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import {tau} from "./math";
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export default function() {
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var value = identity,
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sortValues = descending,
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sort = null,
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startAngle = constant(0),
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endAngle = constant(tau),
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padAngle = constant(0);
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function pie(data) {
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var i,
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n = data.length,
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j,
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k,
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sum = 0,
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index = new Array(n),
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arcs = new Array(n),
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a0 = +startAngle.apply(this, arguments),
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da = Math.min(tau, Math.max(-tau, endAngle.apply(this, arguments) - a0)),
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a1,
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p = Math.min(Math.abs(da) / n, padAngle.apply(this, arguments)),
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pa = p * (da < 0 ? -1 : 1),
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v;
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for (i = 0; i < n; ++i) {
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if ((v = arcs[index[i] = i] = +value(data[i], i, data)) > 0) {
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sum += v;
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}
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}
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// Optionally sort the arcs by previously-computed values or by data.
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if (sortValues != null) index.sort(function(i, j) { return sortValues(arcs[i], arcs[j]); });
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else if (sort != null) index.sort(function(i, j) { return sort(data[i], data[j]); });
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// Compute the arcs! They are stored in the original data's order.
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for (i = 0, k = sum ? (da - n * pa) / sum : 0; i < n; ++i, a0 = a1) {
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j = index[i], v = arcs[j], a1 = a0 + (v > 0 ? v * k : 0) + pa, arcs[j] = {
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data: data[j],
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index: i,
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value: v,
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startAngle: a0,
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endAngle: a1,
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padAngle: p
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};
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}
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return arcs;
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}
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pie.value = function(_) {
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return arguments.length ? (value = typeof _ === "function" ? _ : constant(+_), pie) : value;
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};
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pie.sortValues = function(_) {
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return arguments.length ? (sortValues = _, sort = null, pie) : sortValues;
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};
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pie.sort = function(_) {
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return arguments.length ? (sort = _, sortValues = null, pie) : sort;
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};
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pie.startAngle = function(_) {
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return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant(+_), pie) : startAngle;
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};
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pie.endAngle = function(_) {
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return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant(+_), pie) : endAngle;
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};
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pie.padAngle = function(_) {
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return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant(+_), pie) : padAngle;
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};
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return pie;
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}
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