refactor: separate elements logic into a standalone package (#9285)

packages/math/src/rectangle.ts

@@ -0,0 +1,24 @@
+import { pointFrom } from "./point";
+import { lineSegment, lineSegmentIntersectionPoints } from "./segment";
+
+import type { GlobalPoint, LineSegment, LocalPoint, Rectangle } from "./types";
+
+export function rectangle<P extends GlobalPoint | LocalPoint>(
+  topLeft: P,
+  bottomRight: P,
+): Rectangle<P> {
+  return [topLeft, bottomRight] as Rectangle<P>;
+}
+
+export function rectangleIntersectLineSegment<
+  Point extends LocalPoint | GlobalPoint,
+>(r: Rectangle<Point>, l: LineSegment<Point>): Point[] {
+  return [
+    lineSegment(r[0], pointFrom(r[1][0], r[0][1])),
+    lineSegment(pointFrom(r[1][0], r[0][1]), r[1]),
+    lineSegment(r[1], pointFrom(r[0][0], r[1][1])),
+    lineSegment(pointFrom(r[0][0], r[1][1]), r[0]),
+  ]
+    .map((s) => lineSegmentIntersectionPoints(l, s))
+    .filter((i): i is Point => !!i);
+}