55 lines
2.2 KiB
JavaScript
55 lines
2.2 KiB
JavaScript
import { name, version } from '../data.mjs'
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export const plugin = {
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name,
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version,
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macros: {
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gore: function (so, { points, paths, Path }) {
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const from = so.from
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const gores = Number(so.gores)
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const radius = Number(so.radius) //radius of the sphere
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const prefix = so.prefix || 'gore'
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const extraLength = Number(so.extraLength) //the length of the straight section after a complete semisphere
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points[prefix + 'p1'] = from.shift(0, (radius * Math.PI) / 2 + extraLength)
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points[prefix + 'Cp1'] = points[prefix + 'p1'].shift(
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180 - 180 / gores,
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radius / 2 / Math.cos(Math.PI / gores)
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)
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points[prefix + 'p3'] = from.shift(90, (radius * Math.PI) / gores)
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points[prefix + 'p2'] = points[prefix + 'p3'].shift(0, extraLength)
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points[prefix + 'Cp2'] = points[prefix + 'p2'].shift(0, (radius * (Math.PI - 2)) / 2)
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if (extraLength < 0) {
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//top curve used to calculate the new points if extraLength < 0
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paths.auxiliaryPath = new Path()
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.move(points[prefix + 'p1'])
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.curve(points[prefix + 'Cp1'], points[prefix + 'Cp2'], points[prefix + 'p2'])
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.hide()
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points[prefix + 'p2'] = paths.auxiliaryPath.intersectsX(0)[0] //the new point p2 is the one in which the auxiliary curve intersects x=0
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paths.auxiliaryPath = paths.auxiliaryPath.split(points[prefix + 'p2'])[0] //the auxiliary curve is split
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points[prefix + 'Cp1'] = paths.auxiliaryPath.ops[1].cp1 //the new control points are those of the new curve
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points[prefix + 'Cp2'] = paths.auxiliaryPath.ops[1].cp2
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points[prefix + 'p3'] = points[prefix + 'p2'].clone()
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}
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//the seam path is generated
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paths[prefix + 'seam'] = new Path()
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.move(from)
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.line(points[prefix + 'p1'])
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.curve(points[prefix + 'Cp1'], points[prefix + 'Cp2'], points[prefix + 'p2'])
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.line(points[prefix + 'p3'])
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.line(from)
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.close()
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.attr('class', so.class ? so.class : '')
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if (so?.hidden) paths[prefix + 'seam'].hide()
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else paths[prefix + 'seam'].unhide()
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},
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},
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}
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// More specifically named exports
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export const gorePlugin = plugin
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export const pluginGore = plugin
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