Interface: Rect

Lightweight 2D geometry primitives + intersection helpers. Plain object shapes (not classes) so they're cheap to JSON-roundtrip and play nicely with renderer payloads that already use { x, y, width, height } (hit areas, rendering rects).

Conventions:

• Rect uses top-left origin with positive Y down (canvas / DOM convention).
• Circle is centered at (x, y) with radius r.
• "Intersects" tests are inclusive — touching at an edge counts as intersecting.

Properties

Property	Type
height	number
width	number
x	number
y	number