895 lines
30 KiB
JavaScript
895 lines
30 KiB
JavaScript
/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
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import '../../../ext/jspoly.js';
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import { base } from '../../../geo/base.js';
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import { newPolygon, Polygon } from '../../../geo/polygon.js';
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import { polygons as POLY, fillArea } from '../../../geo/polygons.js';
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import { getRangeParameters } from './driver.js';
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import { slicer } from '../../../geo/slicer.js';
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import { Point } from '../../../geo/point.js';
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slicer.slicePost.FDM = slicePost;
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/**
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* may run in minion or worker context. do not create objects
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* that will not quickly encode in threaded mode. add to existing
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* data object. return is ignored.
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*/
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export function slicePost(data, options) {
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const { z, lines, groups } = data;
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const { useAssembly, post_args, zIndexes } = options;
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const { process, isSynth, vaseMode } = post_args;
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const { shellOffset, fillOffset, clipOffset } = post_args;
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data.tops = POLY.nest(groups);
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if (isSynth) {
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const process = post_args.process;
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if (process.sliceSupportGrow > 0) {
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// expand synth supports here so they can be clipped later
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data.tops = POLY.expand(data.tops, process.sliceSupportGrow, data.z, []);
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}
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// do not shell synth widgets because
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// they will be clipped against peers later
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// which requires shelling post-clip
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// but we still need to generate tops
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delete data.groups;
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return;
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}
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const index = zIndexes.indexOf(z);
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const range = getRangeParameters(process, index);
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// calculate fractional shells
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let shellFrac = (range.sliceShells - (range.sliceShells | 0));
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let sliceShells = range.sliceShells | 0;
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if (shellFrac) {
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let v1 = shellFrac > 0.5 ? 1 - shellFrac : shellFrac;
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let v2 = 1 - v1;
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let parts = Math.round(v2/v1) + 1;
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let rem = index % parts;
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let trg = shellFrac > 0.5 ? 1 : parts - 1;
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sliceShells += rem >= trg ? 1 : 0;
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}
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const isFirst = index === 0;
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const height = process.sliceHeight;
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const spaceMult = isFirst ? process.firstLayerLineMult || 1 : 1;
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const count = isSynth ? 1 : sliceShells;
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const offset = shellOffset * spaceMult;
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const fillOff = fillOffset * spaceMult;
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const thinType = isSynth ? undefined : process.sliceDetectThin;
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const nutops = [];
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// co-locate shell processing with top generation in slicer
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for (let top of data.tops) {
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nutops.push(doTopShells(z, top, count, offset/2, offset, fillOff, {
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thinType,
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vaseMode,
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useAssembly
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}));
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}
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data.clip = clipOffset ? POLY.offset(nutops.map(t => t.simple), clipOffset) : undefined;
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data.tops = nutops;
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delete data.groups;
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};
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function offset_default(params) {
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let { z, top, count, top_poly, offset1, offsetN, wasm, last, gaps } = params;
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// standard wall offsetting strategy
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POLY.offset(
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top_poly,
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[-offset1, -offsetN],
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{
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z,
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wasm,
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count,
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outs: top.shells,
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flat: true,
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call: (polys, onCount) => {
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last = polys;
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// mark each poly with depth (offset #) starting at 0
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for (let p of polys) {
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p.depth = count - onCount;
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if (p.fill_off) p.fill_off.forEach(function(pi) {
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// use negative offset for inners
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pi.depth = -(count - onCount);
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});
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// mark inner depth to match parent
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if (p.inner) {
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for (let pi of p.inner) {
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pi.depth = p.depth;
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}
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}
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}
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}
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}
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);
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return { last, gaps };
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}
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function thin_type_1(params) {
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let { z, top, count, top_poly, offsetN, last, gaps } = params;
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top.thin_fill = [];
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top.fill_sparse = [];
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let layers = POLY.inset(top_poly, offsetN, count, z, true);
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last = layers.last().mid;
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top.shells = layers.map(r => r.mid).flat();
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top.gaps = layers.map(r => r.gap).flat();
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let off = offsetN;
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let min = off * 0.75;
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let max = off * 4;
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for (let poly of layers.map(r => r.gap).flat()) {
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let centers = poly.centers(off/2, z, min, max, {lines:false});
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top.fill_sparse.appendAll(centers);
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}
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return { last, gaps };
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}
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function thin_type_2(params) {
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let { z, top, count, top_poly, offset1, offsetN, last, gaps, wasm } = params;
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top.gaps = gaps;
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top.thin_fill = [];
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let oso = {z, count, gaps: [], outs: [], minArea: 0.05, wasm};
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POLY.offset(top_poly, [-offset1, -offsetN], oso);
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oso.outs.forEach((polys, i) => {
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polys.forEach(p => {
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p.depth = i;
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if (p.fill_off) {
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p.fill_off.forEach(pi => pi.depth = i);
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}
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if (p.inner) {
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for (let pi of p.inner) {
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pi.depth = p.depth;
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}
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}
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top.shells.push(p);
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});
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last = polys;
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});
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// slice.solids.trimmed = slice.solids.trimmed || [];
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oso.gaps.forEach((polys, i) => {
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let off = (i == 0 ? offset1 : offsetN);
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polys = POLY.offset(polys, -off * 0.8, {z, minArea: 0, wasm});
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top.thin_fill.appendAll(cullIntersections(
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fillArea(polys, 45, off/2, [], 0.01, off*2),
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fillArea(polys, 135, off/2, [], 0.01, off*2),
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));
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gaps.push(...polys);
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});
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return { last, gaps };
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}
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function thin_type_3(params) {
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// offsetN usually = extrusion width (nozzle diameter)
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let { z, top, count, offsetN, last, gaps } = params;
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// produce trace from outside of poly inward no more than max inset
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let { noodle, remain } = top.poly.noodle(offsetN * count);
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top.gaps = remain;
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let mergeChains = false;
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let simplifyChain = false;
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let shortenAtNexus = false;
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let shortenEdgeSpur = false;
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let intersectChains = true;
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let showNoodle = false;
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let showExtrusion = true;
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let showExtrudeInset = false;
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let showInsetPoints = false;
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let showChainRawPoints = false;
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let showChainInterpPoints = true;
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let showChainIntersect = false;
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let showNuMedLine = false;
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let showMedLine = false;
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let showMedPoints = false;
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let showMedNormals = false;
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let showMedRadii = false;
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let showNexuses = false;
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let thin = top.thin_fill = [];
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let shells = top.shells;
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let sparse = top.fill_sparse = [];
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let scale = 1000;
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let midR = offsetN * 0.5; // nominal extrusion width
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let minR = midR * 0.75; // smallest interior fill or single wall width
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let maxR = midR * 1.5; // max double wall extrusion width
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let maxF = midR * 2; // max interior extrusion width
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let minSpur = offsetN * 1;
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let inset;
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let dstep = minR / 4;
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top.gaps = remain;
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if (true) {
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let dtotl = 0;
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inset = POLY.offset(noodle, -dstep, {
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join: ClipperLib.JoinType.jtRound,
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arc: (1/dstep) * 4
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});
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while (inset && inset.length) {
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dtotl += dstep;
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let ps = POLY.flatten(inset);
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for (let poly of ps) {
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for (let p of poly.segment(minR).points) {
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let d = dtotl * 0+0.05;
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// let z = dtotl * 10;
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if (showInsetPoints)
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shells.append( newPolygon().centerCircle(p, d, 10).setZ(z) );
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}
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}
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POLY.setZ(inset, z);
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shells.appendAll(inset);
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if (true || dtotl >= maxR) {
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break;
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}
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inset = POLY.expand(inset, -dstep);
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}
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}
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// shells.appendAll(noodle);
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// return { last, gaps };
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let pointMap = new Map();
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let lineMap = new Map();
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function pointDist(p0, p1) {
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return Math.hypot(p0.x-p1.x, p0.y-p1.y);
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}
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function point2key(point) {
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return `${(point.x*100)|0}|${(point.y*100)|0}`;
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}
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// convert point to deduplicated / unique point record
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function pointToRec(point) {
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let key = point2key(point);
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let rec = pointMap.get(key);
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if (!rec) {
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rec = {
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key,
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count: 0,
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x: point.x/scale,
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y: point.y/scale,
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r: point.radius/scale,
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};
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pointMap.set(key, rec);
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}
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return rec;
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}
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// convert line to unique line record. matches reversed and duplicate lines
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function pointsToLine(p0, p1) {
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p0 = pointToRec(p0);
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p1 = pointToRec(p1);
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let key = p0.key > p1.key ? `${p1.key}:${p0.key}` : `${p0.key}:${p1.key}`;
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let rec = lineMap.get(key);
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if (rec) {
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rec.count++;
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} else {
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rec = {
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p0,
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p1,
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key,
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count: 1,
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};
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p0.count++;
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p1.count++;
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lineMap.set(key, rec);
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}
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return rec;
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}
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let chains = [];
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// for each standalone noodle, construct medial axis
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// map medial axis points into de-duplicated segments
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// which will be re-connected into chains
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for (let poly of noodle) {
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// scale the polygon (including inners) so the medial axis code works properly
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poly = poly.clone(true).scale({ x:scale, y:scale, z:scale });
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let out = poly.points.map(p => ({ x: p.x|0, y: p.y|0 }));
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let inr = (poly.inner ?? []).map(p => p.points.map(p => ({ x: p.x|0, y: p.y|0 })));
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// construct medial axis lines. this appears to produce duplicate
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// reverse segments in a subset of cases
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let ma = JSPoly.construct_medial_axis(out, inr);
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// dedup the points so we can track them uniquely (for chain intersections)
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for (let { point0, point1 } of ma) {
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pointsToLine(point0, point1);
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}
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}
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// connect segments into chains
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for (let seg of lineMap.values()) {
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let { p0, p1 } = seg;
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let len = seg.len = pointDist(p0, p1);
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// filter out lines where both points' radii are under the
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// minR threshold. shorten and fixup lines where minR falls
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// somewhere along the gradient between ends.
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if (shortenEdgeSpur)
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if (p0.r < minR || p1.r < minR) {
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if (p0.r > minR && len > minSpur) {
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// move p1 toward p0 until minR met
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let pct = (minR - p1.r) / (p0.r - p1.r);
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let dx = p1.x - p0.x;
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let dy = p1.y - p0.y;
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p1.x -= dx * pct;
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p1.y -= dy * pct;
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p1.r = minR;
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pointMap.delete(p1.key);
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} else if (p1.r > minR && len > minSpur) {
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// move p0 toward p1 until minR met
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let pct = (minR - p0.r) / (p1.r - p0.r);
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let dx = p0.x - p1.x;
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let dy = p0.y - p1.y;
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p0.x -= dx * pct;
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p0.y -= dy * pct;
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p0.r = minR;
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pointMap.delete(p0.key);
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} else {
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// both points eliminated
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pointMap.delete(p0.key);
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pointMap.delete(p1.key);
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lineMap.delete(seg.key);
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continue;
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}
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}
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// for each line segment either add it to a chain or start a new chain
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let add;
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for (let chain of chains) {
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if (p0.count === 2 && p0 === chain[0]) {
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// prefix chain with p1
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chain.splice(0,0,p1);
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add = true;
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} else if (p0.count === 2 && p0 === chain.peek()) {
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// append chain with p1
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chain.push(p1);
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add = true;
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} else if (p1.count === 2 && p1 === chain[0]) {
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// prefix chain with p0
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chain.splice(0,0,p0);
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add = true;
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} else if (p1.count === 2 && p1 === chain.peek()) {
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// append chain with p0
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chain.push(p0);
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add = true;
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}
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if (add) {
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chain.total += len;
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break;
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}
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}
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if (!add) {
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chains.push([ p0, p1 ]);
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chains.peek().total = len;
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}
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}
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// todo: merge chains at next of 3 or more preferencing
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// merging longer chains. then shorten remaining nexus chain
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// intersections by minR
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// render inset "noodle"
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if (showNoodle) {
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shells.appendAll(noodle);
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}
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// divide a segment/redius into 1 or more equal subsegments
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function div(cr) {
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if (cr <= maxR) {
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return [ cr ];
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} else if (cr <= maxR * 2) {
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let rem = (cr - midR * 2);
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if (rem < minR) {
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return [ cr / 2, cr / 2 ];
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}
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return [ midR, rem, midR ];
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} else if (cr <= maxR * 3) {
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let rem = (cr - midR * 2);
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if (rem < minR) {
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return [ cr / 3, cr / 3, cr / 3 ];
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}
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return [ midR, rem, midR ];
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} else {
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return [ midR, cr - midR * 2, midR ];
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// let divs = (cr / midR) | 0;
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// return new Array(divs).fill(cr / divs);
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}
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}
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// filter chains that are too short from consideration
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chains = chains.filter(c => c.total >= minR);
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chains.sort((c1,c2) => c2.total - c1.total);
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function merge1chain() {
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let clen = chains.length;
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for (let i=0; i<clen; i++) {
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let ci = chains[i];
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if (!ci) continue;
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for (let j=i+1; j<clen; j++) {
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let cj = chains[j];
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if (!cj) continue;
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if (ci[0] === cj[0]) {
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ci.reverse().appendAll(cj)
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ci.total += cj.total;
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cj.merged = true;
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chains[j] = undefined;
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return true;
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} else if (ci.peek() === cj.peek()) {
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ci.appendAll(cj.reverse());
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ci.total += cj.total;
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cj.merged = true;
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chains[j] = undefined;
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return true;
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} else if (ci.peek() === cj[0]) {
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ci.appendAll(cj);
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ci.total += cj.total;
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cj.merged = true;
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chains[j] = undefined;
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return true;
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} else if (ci[0] === cj.peek()) {
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cj.appendAll(ci);
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cj.total += ci.total;
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ci.merged = true;
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chains[i] = undefined;
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return true;
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}
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}
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}
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return false;
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}
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// map chains to nexus via endpoints
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let nexus = {};
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function addEp(point, chain) {
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let key = point.key;
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let rec = nexus[key];
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if (!rec) rec = nexus[key] = { point, chains: [] };
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if (rec.chains.indexOf(chain) < 0) rec.chains.push(chain);
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}
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// since chains are sorted longest to shortest,
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// they will appear in the nexus record longest to shortest
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for (let chain of chains) {
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addEp(chain[0], chain);
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addEp(chain.peek(), chain);
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}
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// connect chains end to end following nexus branches that result
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// in the longest final merged chain (open or closed)
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// map chain endpoints to nexus points
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while (mergeChains && merge1chain()) ;
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// filter out null chains that were merged into other chains
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chains = chains.filter(chain => chain);
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// filter dup points from connecting ends
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chains = chains.map(chain => chain.filter((v, i) => i === 0 || v !== chain[i - 1]));
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// mark closed chains
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// todo use exact point match by eliminating slice above
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// then later removing repeated points in the resulting chain from merges
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if (mergeChains)
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for (let chain of chains) {
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chain.closed = (chain[0] === chain.peek());
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if (chain.closed) chain.pop();
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}
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// shorten chain length by minR distance by popping or moving points
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function shorten(chain) {
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for (let rem=0, i=chain.length-1; i>=1 && rem < minR; i--) {
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let c1 = chain[i];
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let c2 = chain[i-1];
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let d = pointDist(c1,c2);
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if (rem + d <= minR) {
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chain.pop();
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rem += d;
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} else {
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let diff = minR - rem;
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// move c1 toward c2
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let pct = diff / d;
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let dx = c1.x - c2.x;
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let dy = c1.y - c2.y;
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chain[i] = {
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x: c1.x - dx * pct,
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y: c1.y - dy * pct,
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r: c1.r
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};
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rem = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// shorten chains terminating at nexus by midR
|
|
if (shortenAtNexus)
|
|
for (let rec of Object.values(nexus)) {
|
|
let { point } = rec;
|
|
rec.shorts = 0;
|
|
if (rec.chains.length < 3) continue;
|
|
for (let chain of chains.filter(c => !c.closed)) {
|
|
if (pointDist(chain[0], point) < minR) {
|
|
chain.reverse();
|
|
shorten(chain);
|
|
chain.reverse();
|
|
rec.shorts++;
|
|
} else if (chain.peek() === point) {
|
|
shorten(chain);
|
|
rec.shorts++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (showNexuses)
|
|
for (let rec of Object.values(nexus)) {
|
|
let { point } = rec;
|
|
shells.push(newPolygon().centerCircle(point, 0.2, 6 - rec.shorts));
|
|
}
|
|
|
|
// Keep endpoints; drop interior points closer than R from the last kept point.
|
|
function dropClosePoints(chain, R) {
|
|
if (!chain || chain.length <= 2 || R <= 0) {
|
|
return chain;
|
|
}
|
|
let last = chain[0];
|
|
let out = [ last ];
|
|
let R2 = R * R;
|
|
for (let i = 1; i < chain.length - 1; i++) {
|
|
let dx = chain[i].x - last.x,
|
|
dy = chain[i].y - last.y;
|
|
if (dx * dx + dy * dy >= R2) {
|
|
out.push(chain[i]);
|
|
last = chain[i];
|
|
}
|
|
}
|
|
out.push(chain[chain.length - 1]);
|
|
return out;
|
|
}
|
|
|
|
// drop chain points < minR apart
|
|
if (simplifyChain) {
|
|
chains = chains.map(chain => dropClosePoints(chain, minR));
|
|
}
|
|
|
|
function renderPointNormal(pt, ndx, ndy) {
|
|
if (showMedNormals) {
|
|
let xo = ndx * pt.r;
|
|
let yo = ndy * pt.r;
|
|
thin.push(new Point(pt.x + yo, pt.y - xo));
|
|
thin.push(new Point(pt.x - yo, pt.y + xo));
|
|
}
|
|
if (showMedRadii) {
|
|
const Sx = pt.x + ndy * pt.r;
|
|
const Sy = pt.y - ndx * pt.r;
|
|
const pop = div(pt.r);
|
|
let acc = 0;
|
|
for (let r of pop) {
|
|
const t = acc + r;
|
|
const px = Sx + -ndy * t;
|
|
const py = Sy + ndx * t;
|
|
shells.push(newPolygon().centerCircle({x:px, y:py}, r, 10));
|
|
acc += r * 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
// gather point offsets into shells
|
|
let zi = z;
|
|
let nuchains = [];
|
|
for (let chain of chains) {
|
|
let nuchain = [];
|
|
nuchains.push(nuchain);
|
|
// zi += 0.1;
|
|
if (showChainRawPoints)
|
|
for (let pt of chain) {
|
|
shells.push(newPolygon().centerCircle(pt, pt.r ?? 0.1, 10));
|
|
}
|
|
// draw medial axis chain
|
|
let { closed, length } = chain;
|
|
let term = closed ? length : length - 1;
|
|
let segs = [];
|
|
for (let i=0; i<term; i++) {
|
|
let p0 = chain[i];
|
|
let p1 = chain[(i+1) % length];
|
|
let len = pointDist(p0, p1);
|
|
// medial axis segment
|
|
if (showMedLine) {
|
|
thin.push(new Point(p0.x, p0.y, zi));
|
|
thin.push(new Point(p1.x, p1.y, zi));
|
|
}
|
|
// compute medial axis segment normal
|
|
let steps = Math.ceil(len / midR) + 1;
|
|
let step = 1 / steps;
|
|
let dr = (p1.r - p0.r);
|
|
let dx = (p1.x - p0.x);
|
|
let dy = (p1.y - p0.y);
|
|
let ndx = dx / len;
|
|
let ndy = dy / len;
|
|
segs.push({ p0, p1, steps, step, dr, dx, dy, ndx, ndy });
|
|
}
|
|
|
|
// compute chain subdivisions
|
|
let slen = segs.length;
|
|
for (let si=0; si<slen; si++) {
|
|
let seg = segs[si];
|
|
let segp = segs[(si - 1 + slen) % slen];
|
|
let { p0, p1, steps, step, dr, dx, dy, ndx, ndy } = seg;
|
|
let first = si === 0;
|
|
let last = si === slen - 1;
|
|
let mid = !(first || last);
|
|
if (first || mid) {
|
|
nuchain.push(p0);
|
|
}
|
|
// for length 2, first and last segment are the same
|
|
if (showMedPoints) {
|
|
if (first) {
|
|
// todo: handle closed
|
|
shells.push(newPolygon().centerCircle(p0, p0.r/2, 10));
|
|
}
|
|
if (mid) {
|
|
// mid segments
|
|
shells.push(newPolygon().centerCircle(p0, p0.r/2, 10));
|
|
}
|
|
if (last) {
|
|
// todo: handle closed
|
|
shells.push(newPolygon().centerCircle(p0, p0.r/2, 10));
|
|
if (closed) {
|
|
console.log('closed');
|
|
} else {
|
|
shells.push(newPolygon().centerCircle(p1, p1.r/2, 10));
|
|
}
|
|
}
|
|
}
|
|
{
|
|
// todo: handle closed
|
|
if (first) {
|
|
renderPointNormal(p0, ndx, ndy);
|
|
}
|
|
if (mid) {
|
|
renderPointNormal(p0, ((ndx + segp.ndx)/2), ((ndy + segp.ndy)/2));
|
|
}
|
|
if (last) {
|
|
renderPointNormal(p1, ndx, ndy);
|
|
}
|
|
}
|
|
// interpolate across the length of the chain segment
|
|
for (let indx = 1; indx < steps; indx++) {
|
|
const inc = indx * step;
|
|
const cr = p0.r + dr * inc;
|
|
const cx = p0.x + dx * inc;
|
|
const cy = p0.y + dy * inc;
|
|
const xo = ndx * cr;
|
|
const yo = ndy * cr;
|
|
if (showChainInterpPoints) {
|
|
if (showMedPoints) {
|
|
shells.push(newPolygon().centerCircle({ x:cx, y:cy }, cr/2, 10));
|
|
}
|
|
renderPointNormal({ x:cx, y:cy, r:cr }, ndx, ndy);
|
|
}
|
|
nuchain.push({ x:cx, y:cy, r:cr });
|
|
}
|
|
if (last) {
|
|
nuchain.push(p1);
|
|
}
|
|
}
|
|
if (showNuMedLine) {
|
|
for (let i=0; i<nuchain.length-1; i++) {
|
|
let p0 = nuchain[i];
|
|
let p1 = nuchain[i+1];
|
|
thin.push(new Point(p0.x, p0.y, z));
|
|
thin.push(new Point(p1.x, p1.y, z));
|
|
}
|
|
}
|
|
}
|
|
|
|
// project inset segment normals onto closest chain
|
|
if (intersectChains) {
|
|
let { intersect } = base.util;
|
|
let { SEGINT } = base.key;
|
|
inset = POLY.flatten(inset, []);
|
|
for (let poly of inset) {
|
|
let nupoly = new Polygon();
|
|
poly.segment(minR).forEachSegment((p1, p2) => {
|
|
let np1 = { x:(p1.x+p2.x)/2, y:(p1.y+p2.y)/2 };
|
|
let len = pointDist(p1, p2);
|
|
let dx = (p1.x - p2.x) / len;
|
|
let dy = (p1.y - p2.y) / len;
|
|
let np2 = { x: np1.x + dy * 10, y: np1.y - dx * 10 };
|
|
let min = { dist: Infinity };
|
|
for (let chain of nuchains) {
|
|
for (let i=0; i<chain.length-1; i++) {
|
|
let c1 = chain[i];
|
|
let c2 = chain[i+1];
|
|
let int = intersect(np1, np2, c1, c2, SEGINT);
|
|
if (int?.dist < min.dist && int?.dist < midR) {
|
|
min = int;
|
|
}
|
|
}
|
|
}
|
|
if (min.p1) {
|
|
let { p1, p2 } = min;
|
|
if (showChainIntersect) {
|
|
thin.push(new Point(np1.x, np1.y));
|
|
thin.push(new Point(min.x, min.y));
|
|
}
|
|
let mr = Math.min(p1.r, p2.r);
|
|
if (mr < minR) return;
|
|
let pop = div(mr);
|
|
let odd = (pop.length % 2 === 1);
|
|
let len = Math.ceil(pop.length / 2);
|
|
if (odd && p1.claimed) len--;
|
|
// implement first-to-intersect claim system
|
|
// for odd wall counts so that they're not emitted twice
|
|
// todo extend to all odd counts
|
|
if (len === 0) {
|
|
return;
|
|
}
|
|
if (pop.length === 1) {
|
|
nupoly.push(new Point(min.x, min.y));
|
|
// for single wall place it exactly on medial axis
|
|
if (showExtrusion)
|
|
shells.push(newPolygon().centerCircle({
|
|
x: min.x,
|
|
y: min.y
|
|
}, mr, 12));
|
|
} else {
|
|
let off = -dstep;
|
|
// otherwise use divisions
|
|
for (let i=0; i<1; i++) {
|
|
off += (pop[i] * (i ? 2 : 1));
|
|
if (showExtrusion)
|
|
shells.push(newPolygon().centerCircle({
|
|
x: np1.x + dy * off,
|
|
y: np1.y - dx * off
|
|
}, pop[0], 12));
|
|
}
|
|
off += dstep / 2;
|
|
nupoly.push(new Point(np1.x + dy * off * 2, np1.y - dx * off * 2));
|
|
}
|
|
p1.claimed = true;
|
|
}
|
|
});
|
|
if (showExtrudeInset) {
|
|
shells.push(...nupoly.clean().simplify());
|
|
}
|
|
}
|
|
}
|
|
|
|
POLY.setZ([...thin, ...shells], z);
|
|
// POLY.setZ([...shells], z);
|
|
|
|
return { last, gaps };
|
|
}
|
|
|
|
/**
|
|
* may run in minion or worker context. performs shell offsetting
|
|
* including thin wall detection when enabled
|
|
*/
|
|
export function doTopShells(z, top, count, offset1, offsetN, fillOffset, opt = {}) {
|
|
// pretend we're a top object in minions
|
|
if (!top.poly) {
|
|
top = { poly: top };
|
|
}
|
|
|
|
// add simple (low rez poly) where less accuracy is OK
|
|
top.simple = top.poly.simple();
|
|
|
|
let wasm = opt.useAssembly;
|
|
let top_poly = [ top.poly ];
|
|
|
|
if (opt.vaseMode) {
|
|
// remove top poly inners in vase mode
|
|
top.poly = top.poly.clone(false);
|
|
}
|
|
|
|
top.shells = []; // strategies output shells here
|
|
top.fill_off = []; // offset from innermost shell for infill
|
|
top.fill_lines = []; // fill lines inside fill_off
|
|
|
|
let last = [],
|
|
gaps = [];
|
|
|
|
if (count) {
|
|
// permit offset of 0 for laser and drag knife
|
|
if (offset1 === 0 && count === 1) {
|
|
last = top_poly.clone(true);
|
|
top.shells = last;
|
|
} else {
|
|
// heal top open polygons if the ends are close (benchy tilt test)
|
|
top_poly.forEach(p => { if (p.open) {
|
|
let dist = p.first().distTo2D(p.last());
|
|
if (dist < 1) p.open = false;
|
|
} });
|
|
let ret = { last, gaps };
|
|
switch (opt.thinType) {
|
|
case "type 1":
|
|
ret = thin_type_1({ z, top, count, top_poly, offsetN, fillOffset });
|
|
break;
|
|
case "type 2":
|
|
ret = thin_type_2({ z, top, count, top_poly, offset1, offsetN, fillOffset, gaps, wasm });
|
|
break;
|
|
case "type 3":
|
|
ret = thin_type_3({ z, top, count, top_poly, offsetN });
|
|
break;
|
|
default:
|
|
ret = offset_default({ z, top, count, top_poly, offset1, offsetN, wasm });
|
|
break;
|
|
}
|
|
last = ret.last || last;
|
|
gaps = ret.gaps || gaps;
|
|
}
|
|
} else {
|
|
// no shells, just infill, is permitted
|
|
last = [top.poly];
|
|
}
|
|
|
|
// generate fill offset poly set from last offset to top.fill_off
|
|
if (fillOffset && last.length > 0) {
|
|
// if gaps present, remove that area from fill inset
|
|
if (gaps.length) {
|
|
let nulast = [];
|
|
POLY.subtract(last, gaps, nulast, null, z);
|
|
last = nulast;
|
|
}
|
|
last.forEach(function(inner) {
|
|
POLY.offset([inner], -fillOffset, {outs: top.fill_off, flat: true, z});
|
|
});
|
|
}
|
|
|
|
// for diffing
|
|
top.last = last;
|
|
// top.last_simple = last.map(p => p.clean(true, undefined, config.clipper / 10));
|
|
|
|
return top;
|
|
}
|
|
|
|
/**
|
|
* given an array of arrays of points (lines), eliminate intersections
|
|
* between groups, then return a unified array of shortest non-intersects.
|
|
*/
|
|
function cullIntersections() {
|
|
function toLines(pts) {
|
|
let lns = [];
|
|
for (let i=0, il=pts.length; i<il; i += 2) {
|
|
lns.push({a: pts[i], b: pts[i+1], l: pts[i].distTo2D(pts[i+1])});
|
|
}
|
|
return lns;
|
|
}
|
|
let aOa = [...arguments].filter(t => t);
|
|
if (aOa.length < 1) return;
|
|
let aa = toLines(aOa.shift());
|
|
while (aOa.length) {
|
|
let bb = toLines(aOa.shift());
|
|
loop: for (let i=0, il=aa.length; i<il; i++) {
|
|
let al = aa[i];
|
|
if (al.del) {
|
|
continue;
|
|
}
|
|
for (let j=0, jl=bb.length; j<jl; j++) {
|
|
let bl = bb[j];
|
|
if (bl.del) {
|
|
continue;
|
|
}
|
|
if (base.util.intersect(al.a, al.b, bl.a, bl.b, base.key.SEGINT)) {
|
|
if (al.l < bl.l) {
|
|
bl.del = true;
|
|
} else {
|
|
al.del = true;
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
aa = aa.filter(l => !l.del).concat(bb.filter(l => !l.del));
|
|
}
|
|
let good = [];
|
|
for (let i=0, il=aa.length; i<il; i++) {
|
|
let al = aa[i];
|
|
good.push(al.a);
|
|
good.push(al.b);
|
|
}
|
|
return good.length > 2 ? good : [];
|
|
}
|