@polygonjs/polygonjs
Version:
node-based WebGL 3D engine https://polygonjs.com
57 lines (56 loc) • 1.69 kB
JavaScript
;
import { CoreGeometryBuilderBase } from "./_Base";
export class CoreGeometryBuilderLineSegments extends CoreGeometryBuilderBase {
_filterPoints(points) {
var _a;
const firstPoint = points[0];
if (!firstPoint) {
return [];
}
const geometry = firstPoint.geometry();
if (!geometry) {
return [];
}
const indices = (_a = geometry.getIndex()) == null ? void 0 : _a.array;
if (!indices) {
return [];
}
const points_by_index = {};
for (const point of points) {
points_by_index[point.index()] = point;
}
const filteredPoints = [];
const index_length = indices.length;
for (let i = 0; i < index_length; i += 2) {
const pt0 = points_by_index[indices[i + 0]];
const pt1 = points_by_index[indices[i + 1]];
if (pt0 && pt1) {
filteredPoints.push(pt0);
filteredPoints.push(pt1);
}
}
return filteredPoints;
}
_indicesFromPoints(new_index_by_old_index, old_geometry) {
const index_attrib = old_geometry.index;
if (index_attrib != null) {
const old_indices = index_attrib.array;
const new_indices = [];
let old_index0;
let old_index1;
let new_index0;
let new_index1;
for (let i = 0; i < old_indices.length; i += 2) {
old_index0 = old_indices[i];
old_index1 = old_indices[i + 1];
new_index0 = new_index_by_old_index[old_index0];
new_index1 = new_index_by_old_index[old_index1];
if (new_index0 != null && new_index1 != null) {
new_indices.push(new_index0);
new_indices.push(new_index1);
}
}
return new_indices;
}
}
}