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for area offsets, disable wasm (lacks features) and use round joins for offsets (better tool paths for cnc)

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This commit is contained in:
Stewart Allen 2025-12-13 15:48:30 -05:00
commit d5b6d4c080
7 changed files with 66 additions and 46 deletions
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33
src/geo/polygons.js
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@ -441,11 +441,10 @@ export function union(polys, minarea, all, opt = {}) {
let lpre = length(polys);
if (opt.wasm && geo.wasm) {
let min = minarea ?? 0.01;
// let deepLength = polys.map(p => p.deepLength).reduce((a,v) => a+v);
// if (deepLength < 15000)
try {
let out = geo.wasm.js.union(polys, polys[0].getZ()).filter(p => p.area() > min);
console.log({ wasm_union: polys, minarea });
if (minarea) polys = polys.filter(p => p.area() >= minarea);
let out = geo.wasm.js.union(polys, polys[0].getZ());
opt.changes = length(out) - lpre;
return out;
} catch (e) {
@ -461,10 +460,10 @@ export function union(polys, minarea, all, opt = {}) {
if (!out[j]) continue;
union = out[i].union(out[j], minarea, all);
if (union && union.length) {
if (opt.onmerge) {
a = out[i];
b = out[j];
}
// if (opt.onmerge) {
// a = out[i];
// b = out[j];
// }
out[i] = null;
out[j] = null;
if (all) {
@ -472,9 +471,9 @@ export function union(polys, minarea, all, opt = {}) {
} else {
out.push(union);
}
if (opt.onmerge) {
opt.onmerge(a, b, union);
}
// if (opt.onmerge) {
// opt.onmerge(a, b, union);
// }
continue outer;
}
}
@ -629,7 +628,7 @@ export function offset(polys, dist, opts = {}) {
mina = numOrDefault(opts.minArea, 0.1),
zed = opts.z || 0;
if (opts.wasm && geo.wasm) {
if (opts.wasm && geo.wasm && join === JoinType.jtMiter && fill === FillNonZero && type === EndType.etClosedPolygon) {
try {
polys = geo.wasm.js.offset(polys, offs, zed, clean ? config.clipperClean : 0, simple ? 1 : 0);
if (open.length) polys.appendAll(open);
@ -651,7 +650,7 @@ export function offset(polys, dist, opts = {}) {
coff.AddPaths(poly, join, type);
}
// perform offset
coff.Execute(tree, offs * config.clipper);
coff.Execute(tree, (offs * config.clipper) | 0);
// convert back from clipper output format
polys = fromClipperTree(tree, zed, null, null, mina);
}
@ -660,10 +659,14 @@ export function offset(polys, dist, opts = {}) {
// if specified, perform offset gap analysis
if (opts.gaps && polys.length) {
let oneg = offset(polys, -offs, {
fill: opts.fill, join: opts.join, type: opts.type, z: opts.z, minArea: mina
fill: opts.fill,
join: opts.join,
type: opts.type,
z: opts.z,
minArea: mina
});
let suba = [];
let diff = subtract(orig, oneg, suba, null, zed);
subtract(orig, oneg, suba, null, zed);
opts.gaps.append(suba, opts.flat);
}