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Running
File size: 2,409 Bytes
b40f1ec | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | import { Pattern, CreaseDef } from './patterns';
export function parseFoldFile(jsonStr: string, filename: string): Pattern | null {
try {
const data = JSON.parse(jsonStr);
if (!data.vertices_coords || !data.faces_vertices) {
throw new Error("Missing required FOLD fields (vertices_coords, faces_vertices)");
}
// Extract vertices and find bounding box for normalization
let minX = Infinity, maxX = -Infinity, minY = Infinity, maxY = -Infinity;
const rawVertices: [number, number][] = data.vertices_coords.map((v: number[]) => {
const x = v[0];
const y = v[1];
minX = Math.min(minX, x);
maxX = Math.max(maxX, x);
minY = Math.min(minY, y);
maxY = Math.max(maxY, y);
return [x, y];
});
const width = maxX - minX;
const height = maxY - minY;
// Scale to fit nicely in the view (from -1 to 1)
const scale = 2 / Math.max(width, height, 0.001);
const cx = (minX + maxX) / 2;
const cy = (minY + maxY) / 2;
const vertices: [number, number][] = rawVertices.map(v => [
(v[0] - cx) * scale,
(v[1] - cy) * scale
]);
// Extract and triangulate faces
const faces: [number, number, number][] = [];
data.faces_vertices.forEach((face: number[]) => {
if (face.length === 3) {
faces.push([face[0], face[1], face[2]]);
} else if (face.length > 3) {
// Simple fan triangulation for convex polygons
for (let i = 1; i < face.length - 1; i++) {
faces.push([face[0], face[i], face[i + 1]]);
}
}
});
// Extract creases
const creases: CreaseDef[] = [];
if (data.edges_vertices && data.edges_assignment) {
data.edges_vertices.forEach((edge: [number, number], i: number) => {
const assignment = data.edges_assignment[i];
if (assignment === 'M' || assignment === 'm') {
creases.push({ edge, type: 'mountain' });
} else if (assignment === 'V' || assignment === 'v') {
creases.push({ edge, type: 'valley' });
} else if (assignment === 'F' || assignment === 'f') {
creases.push({ edge, type: 'flat' });
}
});
}
return {
id: 'custom-' + Date.now(),
name: filename.replace('.fold', ''),
vertices,
faces,
creases
};
} catch (e) {
console.error("Error parsing FOLD file:", e);
return null;
}
}
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