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fix open paths with head = tail, 2 dup point lines

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This commit is contained in:
Stewart Allen 2022-10-04 13:36:33 -04:00
commit 64a244f151
1 changed files with 18 additions and 5 deletions
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23
src/geo/paths.js
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@ -166,20 +166,30 @@ function pointsToPath(points, offset, open, miter = 1.5) {
// calculate segment normals which are used to calculate vertex normals // calculate segment normals which are used to calculate vertex normals
// next segment info is associated with the current point // next segment info is associated with the current point
const nupoints = []; const nupoints = [];
for (let i=0, l=points.length; i<l; i++) { const length = points.length;
if (length === 2 && points[0].isEqual(points[1])) {
return { };
}
const dedup = (open && length > 2) || (!open && length > 3);
for (let i=0; i<length; i++) {
let p1 = points[i]; let p1 = points[i];
let p2 = points[(i+1)%l]; let p2 = points[(i + 1) % length];
p1.normal = calc_normal(p1, p2); p1.normal = calc_normal(p1, p2);
// drop next duplicate point if segment length is 0 // drop next duplicate point if segment length is 0
// is possible there are 3 dups in a row and this is // is possible there are 3 dups in a row and this is
// not handled. could make if a while, but that could // not handled. could make if a while, but that could
// end up in a loop without additional checks // end up in a loop without additional checks. ignore
if (p1.normal.len === 0) { // the case when the last and first point are the same
p1.normal = calc_normal(p1, points[(i+2)%l]); // which is valid when the line is an open path
if (dedup && p1.normal.len === 0 && i !== length - 1) {
p1.normal = calc_normal(p1, points[(i + 2) % length]);
i++; i++;
} }
nupoints.push(p1); nupoints.push(p1);
} }
if (nupoints.length === 1) {
console.log({points, nupoints});
}
// when points are dropped, we need the new array // when points are dropped, we need the new array
points = nupoints; points = nupoints;
// generate left / right paths and triangle faces // generate left / right paths and triangle faces
@ -291,6 +301,9 @@ function pointsToPath(points, offset, open, miter = 1.5) {
function pathTo3D(path, height, z) { function pathTo3D(path, height, z) {
const { faces, left, right, open } = path; const { faces, left, right, open } = path;
const out = []; const out = [];
if (!(faces && left && right)) {
return [];
}
if (z !== undefined) { if (z !== undefined) {
for (let p of faces) { for (let p of faces) {
p.z = z; p.z = z;