chore: Introducing RotatedBounds

Signed-off-by: Mark Tolmacs <mark@lazycat.hu>

packages/common/src/bounds.ts

@@ -1,3 +1,5 @@
+import type { Radians } from "@excalidraw/math";
+
 /**
  * x and y position of top left corner, x and y position of bottom right corner
  */
@@ -6,7 +8,31 @@ export type Bounds = readonly [
   minY: number,
   maxX: number,
   maxY: number,
-];
+] & { _brand: "excalidraw__bounds" };
+
+export type RotatedBounds = readonly [
+  minX: number,
+  minY: number,
+  maxX: number,
+  maxY: number,
+  angle: Radians,
+] & {
+  _brand_rotated: "excalidraw__rotated_bounds";
+};
+
+export const bounds = <T extends Radians | undefined = undefined>(
+  minX: number,
+  minY: number,
+  maxX: number,
+  maxY: number,
+  angle: T = undefined as T,
+) => {
+  return (
+    angle
+      ? ([minX, minY, maxX, maxY, angle] as unknown)
+      : ([minX, minY, maxX, maxY] as unknown)
+  ) as T extends Radians ? RotatedBounds : Bounds;
+};
 
 export const isBounds = (box: unknown): box is Bounds =>
   Array.isArray(box) &&
@@ -15,3 +41,12 @@ export const isBounds = (box: unknown): box is Bounds =>
   typeof box[1] === "number" &&
   typeof box[2] === "number" &&
   typeof box[3] === "number";
+
+export const isRotatedBounds = (box: unknown): box is RotatedBounds =>
+  Array.isArray(box) &&
+  box.length === 5 &&
+  typeof box[0] === "number" &&
+  typeof box[1] === "number" &&
+  typeof box[2] === "number" &&
+  typeof box[3] === "number" &&
+  typeof box[4] === "number";