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import {

curveBasis,

curveBasisClosed,

curveBasisOpen,

curveBundle,

curveCardinal,

curveCardinalClosed,

curveCardinalOpen,

curveCatmullRom,

curveCatmullRomClosed,

curveCatmullRomOpen,

curveLinear,

curveLinearClosed,

curveMonotoneX,

curveMonotoneY,

curveNatural,

curveStep,

curveStepAfter,

curveStepBefore

} from "d3-shape";

const curves = new Map([

["basis", curveBasis],

["basis-closed", curveBasisClosed],

["basis-open", curveBasisOpen],

["bundle", curveBundle],

["cardinal", curveCardinal],

["cardinal-closed", curveCardinalClosed],

["cardinal-open", curveCardinalOpen],

["catmull-rom", curveCatmullRom],

["catmull-rom-closed", curveCatmullRomClosed],

["catmull-rom-open", curveCatmullRomOpen],

["linear", curveLinear],

["linear-closed", curveLinearClosed],

["monotone-x", curveMonotoneX],

["monotone-y", curveMonotoneY],

["natural", curveNatural],

["step", curveStep],

["step-after", curveStepAfter],

["step-before", curveStepBefore]

]);

// TODO Tension and other parameters (e.g., curve: ["cardinal", 1])?

export function Curve(curve = curveLinear) {

if (typeof curve === "function") return curve; // custom curve

const c = (curve + "").toLowerCase();

if (!curves.has(c)) throw new Error(`unknown curve: ${c}`);

return curves.get(c);

}

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