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56 lines
1.5 KiB
56 lines
1.5 KiB
1 year ago
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import {path} from "d3-path";
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import constant from "./constant";
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import curveLinear from "./curve/linear";
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import {x as pointX, y as pointY} from "./point";
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export default function() {
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var x = pointX,
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y = pointY,
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defined = constant(true),
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context = null,
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curve = curveLinear,
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output = null;
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function line(data) {
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var i,
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n = data.length,
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d,
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defined0 = false,
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buffer;
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if (context == null) output = curve(buffer = path());
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for (i = 0; i <= n; ++i) {
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if (!(i < n && defined(d = data[i], i, data)) === defined0) {
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if (defined0 = !defined0) output.lineStart();
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else output.lineEnd();
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}
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if (defined0) output.point(+x(d, i, data), +y(d, i, data));
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}
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if (buffer) return output = null, buffer + "" || null;
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}
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line.x = function(_) {
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return arguments.length ? (x = typeof _ === "function" ? _ : constant(+_), line) : x;
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};
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line.y = function(_) {
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return arguments.length ? (y = typeof _ === "function" ? _ : constant(+_), line) : y;
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};
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line.defined = function(_) {
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return arguments.length ? (defined = typeof _ === "function" ? _ : constant(!!_), line) : defined;
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};
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line.curve = function(_) {
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return arguments.length ? (curve = _, context != null && (output = curve(context)), line) : curve;
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};
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line.context = function(_) {
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return arguments.length ? (_ == null ? context = output = null : output = curve(context = _), line) : context;
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};
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return line;
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}
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