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interpolate medial axis cross sections

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This commit is contained in:
Stewart Allen 2025-07-26 20:13:01 -07:00
commit 2061b0d9c3
1 changed files with 21 additions and 12 deletions
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33
src/kiri/mode/fdm/post.js
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@ -2,7 +2,6 @@
import '../../../ext/jspoly.js';
import { base } from '../../../geo/base.js';
import { Line } from '../../../geo/line.js';
import { polygons as POLY, fillArea } from '../../../geo/polygons.js';
import { getRangeParameters } from './driver.js';
import { slicer } from '../../../geo/slicer.js';
@ -293,21 +292,31 @@ function thin_type_3(params) {
for (let chain of chains) {
if (chain.total >= minR)
for (let i=0; i<chain.length-1; i++) {
// medial axis segment
thin.push(new Point(chain[i].x, chain[i].y));
thin.push(new Point(chain[i+1].x, chain[i+1].y));
// compute medial axis segment cross section
let p0 = chain[i];
let p1 = chain[i+1];
let cp = {
mx: (p0.x + p1.x) / 2,
my: (p0.y + p1.y) / 2,
mr: (p0.r + p1.r) / 2,
dx: (p1.x - p0.x) / p0.len,
dy: (p1.y - p0.y) / p0.len
};
thin.push(new Point(cp.mx, cp.my));
thin.push(new Point(cp.mx + cp.dy * cp.mr, cp.my - cp.dx * cp.mr));
thin.push(new Point(cp.mx, cp.my));
thin.push(new Point(cp.mx - cp.dy * cp.mr, cp.my + cp.dx * cp.mr));
let dr = (p1.r - p0.r);
let dx = (p1.x - p0.x);
let dy = (p1.y - p0.y);
let ndx = dx / p0.len;
let ndy = dy / p0.len;
let offs = p0.len <= offsetN ? [ 0.5 ] : base.util.lerp(0, p0.len, offsetN, true);
let indx = 0;
let step = 1 / offs.length;
// interpolate across the length of the chain segment
for (let off of offs) {
let inc = (indx++ * step);
let cp = {
r: p0.r + dr * inc,
x: p0.x + dx * inc,
y: p0.y + dy * inc
};
thin.push(new Point(cp.x + ndy * cp.r, cp.y - ndx * cp.r));
thin.push(new Point(cp.x - ndy * cp.r, cp.y + ndx * cp.r));
}
}
}