Further math refactor and simplifications

packages/math/rectangle.ts

@@ -0,0 +1,28 @@
+import { invariant } from "../excalidraw/utils";
+import type { GenericPoint, Rectangle } from "./types";
+
+export function rectangle<P extends GenericPoint>(
+  a: P,
+  b: P,
+  c: P,
+  d: P,
+): Rectangle<P> {
+  return [a, b, c, d] as Rectangle<P>;
+}
+
+export function rectangleFromQuad<P extends GenericPoint>(
+  quad: [a: P, b: P, c: P, d: P],
+): Rectangle<P> {
+  return quad as Rectangle<P>;
+}
+
+export function rectangleFromArray<P extends GenericPoint>(
+  pointArray: P[],
+): Rectangle<P> {
+  invariant(
+    pointArray.length === 4,
+    "Point array contains more or less points to create a rectangle from",
+  );
+
+  return pointArray as Rectangle<P>;
+}