Isle-Slingers/js/render/agents.md

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# js/render/ — agents.md
2026-09-29 09:31:53 -05:00
Module map: `MODULES.md`; runtime model: `architecture.md`.
Self-contained module. Exports `ISLE_RENDERER = { Renderer, VIEW_W, VIEW_H }`.
- `new Renderer(canvas, { onEvent })` — pure draw: `draw(ctx, state)` renders
whatever the physics state contains (blocks, enemies, birds, sling, HUD-ish
scenery, popups). It never mutates `state`.
- VIEW_W/VIEW_H (1280x720) mirror physics constants VIEW — keep them in sync;
the camera lives in state (set by physics/camera), render only applies it.
- S-3/S-5 (added): `drawBlock` rotates about the block COM when
`bl.ang` is set (no-op at `ang=0`, so un-tipped blocks draw identically to
the pre-S-3 output), and `drawBird` renders `landed` birds as live bodies
alongside the `spent` corpses. The DOM-stub test only checks that drawing
does not throw and that the sling band stops tracking a launched bird
(bug #14 arm).