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thin3 add point/normal fn

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This commit is contained in:
Stewart Allen 2025-09-16 09:30:56 -04:00
commit dbf8324100
1 changed files with 32 additions and 35 deletions
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67
src/kiri/mode/fdm/post.js
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@ -183,11 +183,11 @@ function thin_type_3(params) {
let mergeChains = true;
let interpolateShortSpur = true;
let showChainRawPoints = false;
let showChainInterpPoints = true;
let showChainInterpPoints = false;
let showMidline = true;
let showMidPoints = true;
let showMidNormals = true;
let showMidRadii = true;
let showMidRadii = false;
let showNexuses = false;
let pointMap = new Map();
@ -481,6 +481,29 @@ function thin_type_3(params) {
top.shells.push(newPolygon().centerCircle(point, 0.2, 6 - rec.shorts));
}
function renderPointNormal(pt, ndx, ndy) {
if (showMidNormals) {
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 (showMidRadii) {
const Sx = pt.x + ndy * pt.r;
const Sy = pt.y - ndx * pt.r;
const circ = top.shells;
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;
circ.push(newPolygon().centerCircle({x:px, y:py}, r, 10));
acc += r * 2;
}
}
}
// gather point offsets into shells
let zi = z;
for (let chain of chains) {
@ -510,7 +533,7 @@ function thin_type_3(params) {
let dy = (p1.y - p0.y);
let ndx = dx / len;
let ndy = dy / len;
segs.push({ p0, p1, len, offs, step, dr, dx, dy, ndx, ndy });
segs.push({ p0, p1, offs, step, dr, dx, dy, ndx, ndy });
}
console.log({ segs });
// compute chain subdivisions
@ -518,7 +541,7 @@ function thin_type_3(params) {
for (let si=0; si<slen; si++) {
let seg = segs[si];
let segp = segs[(si - 1 + slen) % slen];
let { p0, p1, len, offs, step, dr, dx, dy, ndx, ndy } = seg;
let { p0, p1, offs, step, dr, dx, dy, ndx, ndy } = seg;
let first = si === 0;
let last = si === slen - 1;
let mid = !(first || last);
@ -542,25 +565,16 @@ function thin_type_3(params) {
}
}
}
if (showMidNormals) {
{
// todo: handle closed
if (first) {
let xo = ndx * p0.r;
let yo = ndy * p0.r;
thin.push(new Point(p0.x + yo, p0.y - xo));
thin.push(new Point(p0.x - yo, p0.y + xo));
renderPointNormal(p0, ndx, ndy);
}
if (mid) {
let xo = ((ndx + segp.ndx)/2) * p0.r;
let yo = ((ndy + segp.ndy)/2) * p0.r;
thin.push(new Point(p0.x + yo, p0.y - xo));
thin.push(new Point(p0.x - yo, p0.y + xo));
renderPointNormal(p0, ((ndx + segp.ndx)/2), ((ndy + segp.ndy)/2));
}
if (last) {
let xo = ndx * p1.r;
let yo = ndy * p1.r;
thin.push(new Point(p1.x + yo, p1.y - xo));
thin.push(new Point(p1.x - yo, p1.y + xo));
renderPointNormal(p1, ndx, ndy);
}
}
// interpolate across the length of the chain segment
@ -575,24 +589,7 @@ function thin_type_3(params) {
if (showMidPoints) {
top.shells.push(newPolygon().centerCircle({ x:cx, y:cy }, 0.05, 10));
}
if (showMidNormals) {
thin.push(new Point(cx + yo, cy - xo));
thin.push(new Point(cx - yo, cy + xo));
}
if (showMidRadii) {
const Sx = cx + ndy * cr;
const Sy = cy - ndx * cr;
const circ = top.shells;
const pop = div(cr);
let acc = 0;
for (let r of pop) {
const t = acc + r;
const px = Sx + -ndy * t;
const py = Sy + ndx * t;
circ.push(newPolygon().centerCircle({x:px, y:py}, r, 10));
acc += r * 2;
}
}
renderPointNormal({ x:cx, y:cy, r:cr }, ndx, ndy);
}
}
}