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fix thin wall (centers) for compound polys

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This commit is contained in:
Stewart Allen 2021-02-21 00:17:21 -05:00
commit d5c6e8aad6
2 changed files with 33 additions and 21 deletions
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50
src/geo/polygon.js
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@ -264,19 +264,28 @@
PRO.centers = function(step, z, min, max, opt = {}) {
let cloud = [],
bounds = this.bounds,
points = this.points,
length = points.length,
lines = opt.lines || false;
lines = opt.lines || false,
stepoff = step / 2,
set = [this.points];
for (let y of UTIL.lerp(bounds.miny + 0.01, bounds.maxy - 0.01, step, true)) {
if (this.inner) {
for (let inner of this.inner) {
set.push(inner.points);
}
}
for (let y of UTIL.lerp(bounds.miny + stepoff, bounds.maxy - stepoff, step, true)) {
let ints = [];
for (let i=0; i<length; i++) {
let p1 = points[i % length];
let p2 = points[(i+1) % length];
if (
(p1.y <= y && p2.y > y) ||
(p1.y > y && p2.y <= y)
) ints.push([p1,p2]);
for (let points of set) {
let length = points.length;
for (let i=0; i<length; i++) {
let p1 = points[i % length];
let p2 = points[(i+1) % length];
if (
(p1.y <= y && p2.y > y) ||
(p1.y > y && p2.y <= y)
) ints.push([p1,p2]);
}
}
let cntr = [];
if (ints.length && ints.length % 2 === 0) {
@ -322,15 +331,18 @@
}
}
for (let x of UTIL.lerp(bounds.minx + 0.01, bounds.maxx - 0.01, step, true)) {
for (let x of UTIL.lerp(bounds.minx + stepoff, bounds.maxx - stepoff, step, true)) {
let ints = [];
for (let i=0; i<length; i++) {
let p1 = points[i % length];
let p2 = points[(i+1) % length];
if (
(p1.x <= x && p2.x > x) ||
(p1.x > x && p2.x <= x)
) ints.push([p1,p2]);
for (let points of set) {
let length = points.length;
for (let i=0; i<length; i++) {
let p1 = points[i % length];
let p2 = points[(i+1) % length];
if (
(p1.x <= x && p2.x > x) ||
(p1.x > x && p2.x <= x)
) ints.push([p1,p2]);
}
}
let cntr = [];
if (ints.length && ints.length % 2 === 0) {