Add boolean operations (#1759)

frontend/src/utility-functions/computational-geometry.ts

@@ -0,0 +1,34 @@
+import paper from "paper/dist/paper-core";
+
+// Required setup to be used headlessly
+paper.setup(new paper.Size(1, 1));
+paper.view.autoUpdate = false;
+
+export function booleanUnion(path1: string, path2: string): string {
+	return booleanOperation(path1, path2, "unite");
+}
+
+export function booleanSubtract(path1: string, path2: string): string {
+	return booleanOperation(path1, path2, "subtract");
+}
+
+export function booleanIntersect(path1: string, path2: string): string {
+	return booleanOperation(path1, path2, "intersect");
+}
+
+export function booleanDifference(path1: string, path2: string): string {
+	return booleanOperation(path1, path2, "exclude");
+}
+
+export function booleanDivide(path1: string, path2: string): string {
+	return booleanOperation(path1, path2, "intersect") + booleanOperation(path1, path2, "exclude");
+}
+
+function booleanOperation(path1: string, path2: string, operation: "unite" | "subtract" | "intersect" | "exclude"): string {
+	const paperPath1 = new paper.Path(path1);
+	const paperPath2 = new paper.Path(path2);
+	const result = paperPath1[operation](paperPath2);
+	paperPath1.remove();
+	paperPath2.remove();
+	return result.pathData;
+}