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stub in wasm poly diff

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This commit is contained in:
Stewart Allen 2021-06-22 17:16:01 -04:00
commit 5d6d68e2aa
4 changed files with 100 additions and 5 deletions
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9
src/geo/polygons.js
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@ -299,13 +299,14 @@
min = minArea || 0.1,
out = [];
function filter(from, to) {
function filter(from, to = []) {
from.forEach(function(poly) {
if (poly.area() >= min) {
to.push(poly);
out.push(poly);
}
});
return to;
}
// expensive but worth it?
@ -319,6 +320,9 @@
cleanClipperTree(ctre);
filter(fromClipperTree(ctre, z, null, null, min), outA);
}
let woutA = filter(geo.poly.diff(setA, setB, z));
// outA.appendAll(woutA);
// console.log({outA, woutA});
}
if (outB) {
@ -334,6 +338,9 @@
cleanClipperTree(ctre);
filter(fromClipperTree(ctre, z, null, null, min), outB);
}
let woutB = filter(geo.poly.diff(setB, setA, z));
// outB.appendAll(woutB);
// console.log({outB, woutB});
}
return out;

25
src/geo/wasm.js
View file

@ -11,6 +11,7 @@ if (!self.window) (function() {
const geo = self.geo;
geo.poly = {
diff: polyDiff,
union: polyUnion,
offset: polyOffset
};
@ -94,6 +95,29 @@ if (!self.window) (function() {
return polyNest(out);
}
function polyDiff(polysA, polysB, z) {
let wasm = geo.wasm,
memat = wasm.malloc(1024 * 128),
writer = new DataWriter(wasm.heap, memat),
pcountA = 0,
pcountB = 0;
polysA.forEach(poly => pcountA += writePoly(writer, poly));
polysB.forEach(poly => pcountB += writePoly(writer, poly));
let resat = wasm.diff(memat, pcountA, pcountB, (pcountA + pcountB) * factor),
reader = new DataReader(wasm.heap, resat),
out = [];
for (;;) {
let poly = readPoly(reader, z);
if (poly) {
out.push(poly);
} else {
break;
}
}
wasm.free(memat);
return polyNest(out);
}
// nest closed polygons without existing parent / child relationships
function polyNest(polys) {
polys.sort((a,b) => {
@ -149,6 +173,7 @@ if (!self.window) (function() {
malloc: exports.mem_get,
start: exports._start,
free: exports.mem_clr,
diff: exports.poly_diff,
union: exports.poly_union,
offset: exports.poly_offset
};