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88 lines
2.3 KiB
88 lines
2.3 KiB
import {slice} from "./array";
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import constant from "./constant";
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import {cos, halfPi, sin} from "./math";
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import {path} from "d3-path";
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function defaultSource(d) {
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return d.source;
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}
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function defaultTarget(d) {
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return d.target;
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}
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function defaultRadius(d) {
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return d.radius;
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}
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function defaultStartAngle(d) {
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return d.startAngle;
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}
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function defaultEndAngle(d) {
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return d.endAngle;
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}
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export default function() {
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var source = defaultSource,
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target = defaultTarget,
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radius = defaultRadius,
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startAngle = defaultStartAngle,
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endAngle = defaultEndAngle,
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context = null;
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function ribbon() {
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var buffer,
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argv = slice.call(arguments),
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s = source.apply(this, argv),
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t = target.apply(this, argv),
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sr = +radius.apply(this, (argv[0] = s, argv)),
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sa0 = startAngle.apply(this, argv) - halfPi,
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sa1 = endAngle.apply(this, argv) - halfPi,
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sx0 = sr * cos(sa0),
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sy0 = sr * sin(sa0),
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tr = +radius.apply(this, (argv[0] = t, argv)),
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ta0 = startAngle.apply(this, argv) - halfPi,
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ta1 = endAngle.apply(this, argv) - halfPi;
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if (!context) context = buffer = path();
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context.moveTo(sx0, sy0);
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context.arc(0, 0, sr, sa0, sa1);
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if (sa0 !== ta0 || sa1 !== ta1) { // TODO sr !== tr?
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context.quadraticCurveTo(0, 0, tr * cos(ta0), tr * sin(ta0));
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context.arc(0, 0, tr, ta0, ta1);
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}
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context.quadraticCurveTo(0, 0, sx0, sy0);
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context.closePath();
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if (buffer) return context = null, buffer + "" || null;
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}
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ribbon.radius = function(_) {
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return arguments.length ? (radius = typeof _ === "function" ? _ : constant(+_), ribbon) : radius;
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};
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ribbon.startAngle = function(_) {
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return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant(+_), ribbon) : startAngle;
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};
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ribbon.endAngle = function(_) {
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return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant(+_), ribbon) : endAngle;
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};
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ribbon.source = function(_) {
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return arguments.length ? (source = _, ribbon) : source;
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};
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ribbon.target = function(_) {
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return arguments.length ? (target = _, ribbon) : target;
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};
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ribbon.context = function(_) {
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return arguments.length ? ((context = _ == null ? null : _), ribbon) : context;
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};
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return ribbon;
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}
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