116 lines
3.1 KiB
JavaScript
116 lines
3.1 KiB
JavaScript
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const draftRingSector = (part, rot, an, radIn, radEx) => {
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let {
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utils,
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store,
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sa,
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Point,
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points,
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Path,
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paths,
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Snippet,
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snippets,
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options,
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measurements,
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complete,
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paperless,
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macro
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} = part.shorthand();
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const roundExtended = (radius, angle = 90) => {
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let arg = utils.deg2rad(angle / 2);
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return (radius * 4 * (1 - Math.cos(arg))) / Math.sin(arg) / 3;
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};
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/**
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* Calculates the distance of the control point for the internal
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* and external arcs using bezierCircleExtended
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*/
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let distIn = roundExtended(radIn, an / 2);
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let distEx = roundExtended(radEx, an / 2);
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// The centre of the circles
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points.center = new Point(0, 0);
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/**
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* This function is expected to draft ring sectors for
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* angles up to 180%. Since roundExtended works
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* best for angles until 90º, we generate the ring
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* sector using the half angle and then duplicate it
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*/
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/**
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* The first point of the internal arc, situated at
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* a radIn distance below the centre
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*/
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points.in1 = points.center.shift(-90, radIn);
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/**
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* The control point for 'in1'. It's situated at a
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* distance $distIn calculated with bezierCircleExtended
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* and the line between it and 'in1' is perpendicular to
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* the line between 'in1' and the centre, so it's
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* shifted in the direction 0º
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*/
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points.in1C = points.in1.shift(0, distIn);
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/**
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* The second point of the internal arc, situated at
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* a $radIn distance of the centre in the direction
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* $an/2 - 90º
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*/
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points.in2 = points.center.shift(an / 2 - 90, radIn);
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/**
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* The control point for 'in2'. It's situated at a
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* distance $distIn calculated with bezierCircleExtended
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* and the line between it and 'in2' is perpendicular to
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* the line between 'in2' and the centre, so it's
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* shifted in the direction $an/2 + 180º
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*/
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points.in2C = points.in2.shift(an / 2 + 180, distIn);
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/**
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* The points for the external arc are generated in the
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* same way, using $radEx and $distEx instead
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*/
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points.ex1 = points.center.shift(-90, radEx);
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points.ex1C = points.ex1.shift(0, distEx);
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points.ex2 = points.center.shift(an / 2 - 90, radEx);
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points.ex2C = points.ex2.shift(an / 2 + 180, distEx);
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// Flip all the points to generate the full ring sector
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for (let id of ["in2", "in2C", "in1C", "ex1C", "ex2C", "ex2"])
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points[id + "Flipped"] = points[id].flipX();
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// Rotate all the points an angle rot
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for (let id of [
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"in1",
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"in1C",
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"in2",
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"in2C",
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"ex1",
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"ex1C",
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"ex2",
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"ex2C",
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"in2Flipped",
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"in2CFlipped",
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"in1CFlipped",
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"ex1CFlipped",
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"ex2CFlipped",
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"ex2Flipped"
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])
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points[id + "Rotated"] = points[id].rotate(rot, points.center);
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// Return the path of the full ring sector
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return new Path()
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.move(points.in2Flipped)
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.curve(points.in2CFlipped, points.in1CFlipped, points.in1)
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.curve(points.in1C, points.in2C, points.in2)
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.line(points.ex2)
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.curve(points.ex2C, points.ex1C, points.ex1)
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.curve(points.ex1CFlipped, points.ex2CFlipped, points.ex2Flipped)
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.close();
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};
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export default draftRingSector;
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