45 lines
1.1 KiB
JavaScript
45 lines
1.1 KiB
JavaScript
import {namespace} from "d3-selection";
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function attrInterpolate(name, i) {
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return function(t) {
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this.setAttribute(name, i.call(this, t));
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};
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}
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function attrInterpolateNS(fullname, i) {
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return function(t) {
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this.setAttributeNS(fullname.space, fullname.local, i.call(this, t));
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};
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}
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function attrTweenNS(fullname, value) {
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var t0, i0;
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function tween() {
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var i = value.apply(this, arguments);
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if (i !== i0) t0 = (i0 = i) && attrInterpolateNS(fullname, i);
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return t0;
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}
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tween._value = value;
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return tween;
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}
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function attrTween(name, value) {
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var t0, i0;
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function tween() {
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var i = value.apply(this, arguments);
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if (i !== i0) t0 = (i0 = i) && attrInterpolate(name, i);
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return t0;
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}
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tween._value = value;
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return tween;
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}
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export default function(name, value) {
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var key = "attr." + name;
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if (arguments.length < 2) return (key = this.tween(key)) && key._value;
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if (value == null) return this.tween(key, null);
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if (typeof value !== "function") throw new Error;
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var fullname = namespace(name);
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return this.tween(key, (fullname.local ? attrTweenNS : attrTween)(fullname, value));
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}
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