254 lines
9.6 KiB
JavaScript
254 lines
9.6 KiB
JavaScript
const m = require('makerjs')
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const u = require('./utils')
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const a = require('./assert')
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const o = require('./operation')
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const Point = require('./point')
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const prep = require('./prepare')
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const anchor = require('./anchor').parse
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const filter = require('./filter').parse
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const binding = (base, bbox, point, units) => {
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let bind = a.trbl(point.meta.bind || 0, `${point.meta.name}.bind`)(units)
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// if it's a mirrored key, we swap the left and right bind values
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if (point.meta.mirrored) {
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bind = [bind[0], bind[3], bind[2], bind[1]]
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}
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const bt = Math.max(bbox.high[1], 0) + Math.max(bind[0], 0)
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const br = Math.max(bbox.high[0], 0) + Math.max(bind[1], 0)
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const bd = Math.min(bbox.low[1], 0) - Math.max(bind[2], 0)
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const bl = Math.min(bbox.low[0], 0) - Math.max(bind[3], 0)
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if (bind[0] || bind[1]) base = u.union(base, u.rect(br, bt))
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if (bind[1] || bind[2]) base = u.union(base, u.rect(br, -bd, [0, bd]))
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if (bind[2] || bind[3]) base = u.union(base, u.rect(-bl, -bd, [bl, bd]))
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if (bind[3] || bind[0]) base = u.union(base, u.rect(-bl, bt, [bl, 0]))
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return base
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}
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const rectangle = (config, name, points, outlines, units) => {
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// prepare params
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a.unexpected(config, `${name}`, ['size', 'corner', 'bevel'])
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const size = a.wh(config.size, `${name}.size`)(units)
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const rec_units = prep.extend({
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sx: size[0],
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sy: size[1]
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}, units)
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const corner = a.sane(config.corner || 0, `${name}.corner`, 'number')(rec_units)
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const bevel = a.sane(config.bevel || 0, `${name}.bevel`, 'number')(rec_units)
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// return shape function and its units
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return [() => {
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const error = (dim, val) => `Rectangle for "${name}" isn't ${dim} enough for its corner and bevel (${val} - 2 * ${corner} - 2 * ${bevel} <= 0)!`
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const [w, h] = size
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const mod = 2 * (corner + bevel)
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const cw = w - mod
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a.assert(cw >= 0, error('wide', w))
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const ch = h - mod
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a.assert(ch >= 0, error('tall', h))
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let rect = new m.models.Rectangle(cw, ch)
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if (bevel) {
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rect = u.poly([
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[-bevel, 0],
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[-bevel, ch],
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[0, ch + bevel],
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[cw, ch + bevel],
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[cw + bevel, ch],
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[cw + bevel, 0],
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[cw, -bevel],
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[0, -bevel]
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])
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}
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if (corner > 0) rect = m.model.outline(rect, corner, 0)
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rect = m.model.moveRelative(rect, [-cw/2, -ch/2])
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const bbox = {high: [w/2, h/2], low: [-w/2, -h/2]}
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return [rect, bbox]
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}, rec_units]
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}
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const circle = (config, name, points, outlines, units) => {
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// prepare params
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a.unexpected(config, `${name}`, ['radius'])
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const radius = a.sane(config.radius, `${name}.radius`, 'number')(units)
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const circ_units = prep.extend({
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r: radius
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}, units)
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// return shape function and its units
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return [() => {
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let circle = u.circle([0, 0], radius)
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const bbox = {high: [radius, radius], low: [-radius, -radius]}
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return [circle, bbox]
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}, circ_units]
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}
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const polygon = (config, name, points, outlines, units) => {
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// prepare params
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a.unexpected(config, `${name}`, ['points'])
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const poly_points = a.sane(config.points, `${name}.points`, 'array')()
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// return shape function and its units
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return [point => {
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const parsed_points = []
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// the poly starts at [0, 0] as it will be positioned later
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// but we keep the point metadata for potential mirroring purposes
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let last_anchor = new Point(0, 0, 0, point.meta)
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let poly_index = -1
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for (const poly_point of poly_points) {
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const poly_name = `${name}.points[${++poly_index}]`
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last_anchor = anchor(poly_point, poly_name, points, last_anchor)(units)
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parsed_points.push(last_anchor.p)
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}
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let poly = u.poly(parsed_points)
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const bbox = u.bbox(parsed_points)
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return [poly, bbox]
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}, units]
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}
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const outline = (config, name, points, outlines, units) => {
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// prepare params
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a.unexpected(config, `${name}`, ['name', 'origin'])
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a.assert(outlines[config.name], `Field "${name}.name" does not name an existing outline!`)
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const origin = anchor(config.origin || {}, `${name}.origin`, points)(units)
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// return shape function and its units
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return [() => {
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let o = u.deepcopy(outlines[config.name])
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o = origin.unposition(o)
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const bbox = m.measure.modelExtents(o)
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return [o, bbox]
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}, units]
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}
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const whats = {
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rectangle,
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circle,
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polygon,
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outline
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}
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const expand_shorthand = (config, name, units) => {
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if (a.type(config.expand)(units) == 'string') {
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const prefix = config.expand.slice(0, -1)
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const suffix = config.expand.slice(-1)
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const valid_suffixes = [')', '>', ']']
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a.assert(valid_suffixes.includes(suffix), `If field "${name}" is a string, ` +
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`it should end with one of [${valid_suffixes.map(s => `'${s}'`).join(', ')}]!`)
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config.expand = prefix
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config.joints = config.joints || valid_suffixes.indexOf(suffix)
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}
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if (a.type(config.joints)(units) == 'string') {
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if (config.joints == 'round') config.joints = 0
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if (config.joints == 'pointy') config.joints = 1
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if (config.joints == 'beveled') config.joints = 2
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}
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}
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exports.parse = (config, points, units) => {
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// output outlines will be collected here
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const outlines = {}
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// the config must be an actual object so that the exports have names
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config = a.sane(config, 'outlines', 'object')()
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for (let [outline_name, parts] of Object.entries(config)) {
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// placeholder for the current outline
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outlines[outline_name] = {models: {}}
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// each export can consist of multiple parts
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// either sub-objects or arrays are fine...
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if (a.type(parts)() == 'array') {
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parts = {...parts}
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}
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parts = a.sane(parts, `outlines.${outline_name}`, 'object')()
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for (let [part_name, part] of Object.entries(parts)) {
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const name = `outlines.${outline_name}.${part_name}`
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// string part-shortcuts are expanded first
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if (a.type(part)() == 'string') {
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part = o.operation(part, {outline: Object.keys(outlines)})
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}
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// process keys that are common to all part declarations
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const operation = u[a.in(part.operation || 'add', `${name}.operation`, ['add', 'subtract', 'intersect', 'stack'])]
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const what = a.in(part.what || 'outline', `${name}.what`, ['rectangle', 'circle', 'polygon', 'outline'])
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const bound = !!part.bound
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const asym = a.asym(part.asym || 'source', `${name}.asym`)
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// `where` is delayed until we have all, potentially what-dependent units
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// default where is [0, 0], as per filter parsing
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const original_where = part.where // need to save, so the delete's don't get rid of it below
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const where = units => filter(original_where, `${name}.where`, points, units, asym)
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const original_adjust = part.adjust // same as above
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const adjust = start => anchor(original_adjust || {}, `${name}.adjust`, points, start)(units)
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const fillet = a.sane(part.fillet || 0, `${name}.fillet`, 'number')(units)
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expand_shorthand(part, `${name}.expand`, units)
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const expand = a.sane(part.expand || 0, `${name}.expand`, 'number')(units)
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const joints = a.in(a.sane(part.joints || 0, `${name}.joints`, 'number')(units), `${name}.joints`, [0, 1, 2])
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const scale = a.sane(part.scale || 1, `${name}.scale`, 'number')(units)
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// these keys are then removed, so ops can check their own unexpected keys without interference
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delete part.operation
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delete part.what
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delete part.bound
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delete part.asym
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delete part.where
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delete part.adjust
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delete part.fillet
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delete part.expand
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delete part.joints
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delete part.scale
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// a prototype "shape" maker (and its units) are computed
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const [shape_maker, shape_units] = whats[what](part, name, points, outlines, units)
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// and then the shape is repeated for all where positions
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for (const w of where(shape_units)) {
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const point = adjust(w.clone())
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let [shape, bbox] = shape_maker(point) // point is passed for mirroring metadata only...
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if (bound) {
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shape = binding(shape, bbox, point, shape_units)
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}
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shape = point.position(shape) // ...actual positioning happens here
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outlines[outline_name] = operation(outlines[outline_name], shape)
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}
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if (scale !== 1) {
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outlines[outline_name] = m.model.scale(outlines[outline_name], scale)
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}
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if (expand) {
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outlines[outline_name] = m.model.outline(
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outlines[outline_name], Math.abs(expand), joints, (expand < 0), {farPoint: u.farPoint}
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)
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}
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if (fillet) {
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for (const [index, chain] of m.model.findChains(outlines[outline_name]).entries()) {
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outlines[outline_name].models[`fillet_${part_name}_${index}`] = m.chain.fillet(chain, fillet)
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}
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}
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}
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// final adjustments
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m.model.originate(outlines[outline_name])
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m.model.simplify(outlines[outline_name])
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}
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return outlines
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}
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