Initial commit 🎉

fbshipit-source-id: b6fc29740c6875d2e78953b8a7123890a67930f2
Co-authored-by: Sebastian McKenzie <sebmck@fb.com>
Co-authored-by: John Knox <jknox@fb.com>
Co-authored-by: Emil Sjölander <emilsj@fb.com>
Co-authored-by: Pritesh Nandgaonkar <prit91@fb.com>

src/utils/geometry.js

@@ -0,0 +1,43 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+export type Rect = {
+  top: number,
+  left: number,
+  height: number,
+  width: number,
+};
+
+export function isOverlappedRect(a: Rect, b: Rect): boolean {
+  const aRight = a.left + a.width;
+  const bRight = b.left + b.width;
+  const aBottom = a.top + a.height;
+  const bBottom = b.top + b.height;
+  return (
+    a.left < bRight && b.left < aRight && a.top < bBottom && b.top < aBottom
+  );
+}
+
+export function getDistanceRect(a: Rect, b: Rect): number {
+  const mostLeft = a.left < b.left ? a : b;
+  const mostRight = b.left < a.left ? a : b;
+
+  let xDifference =
+    mostLeft.left === mostRight.left
+      ? 0
+      : mostRight.left - (mostLeft.left + mostLeft.width);
+  xDifference = Math.max(0, xDifference);
+
+  const upper = a.top < b.top ? a : b;
+  const lower = b.top < a.top ? a : b;
+
+  let yDifference =
+    upper.top === lower.top ? 0 : lower.top - (upper.top + upper.height);
+  yDifference = Math.max(0, yDifference);
+
+  return Math.min(xDifference, yDifference);
+}