47 lines
1.7 KiB
JavaScript
47 lines
1.7 KiB
JavaScript
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"use strict";
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var core = require("@pixi/core");
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function fixOrientation(points, hole = !1) {
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const m = points.length;
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if (m < 6)
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return;
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let area = 0;
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for (let i = 0, x1 = points[m - 2], y1 = points[m - 1]; i < m; i += 2) {
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const x2 = points[i], y2 = points[i + 1];
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area += (x2 - x1) * (y2 + y1), x1 = x2, y1 = y2;
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}
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if (!hole && area > 0 || hole && area <= 0) {
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const n = m / 2;
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for (let i = n + n % 2; i < m; i += 2) {
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const i1 = m - i - 2, i2 = m - i - 1, i3 = i, i4 = i + 1;
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[points[i1], points[i3]] = [points[i3], points[i1]], [points[i2], points[i4]] = [points[i4], points[i2]];
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}
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}
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}
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const buildPoly = {
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build(graphicsData) {
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graphicsData.points = graphicsData.shape.points.slice();
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},
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triangulate(graphicsData, graphicsGeometry) {
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let points = graphicsData.points;
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const holes = graphicsData.holes, verts = graphicsGeometry.points, indices = graphicsGeometry.indices;
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if (points.length >= 6) {
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fixOrientation(points, !1);
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const holeArray = [];
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for (let i = 0; i < holes.length; i++) {
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const hole = holes[i];
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fixOrientation(hole.points, !0), holeArray.push(points.length / 2), points = points.concat(hole.points);
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}
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const triangles = core.utils.earcut(points, holeArray, 2);
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if (!triangles)
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return;
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const vertPos = verts.length / 2;
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for (let i = 0; i < triangles.length; i += 3)
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indices.push(triangles[i] + vertPos), indices.push(triangles[i + 1] + vertPos), indices.push(triangles[i + 2] + vertPos);
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for (let i = 0; i < points.length; i++)
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verts.push(points[i]);
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}
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}
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};
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exports.buildPoly = buildPoly;
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//# sourceMappingURL=buildPoly.js.map
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