Fixes the zoom frame-rate collapse and rebuilds draw() around a single
camera transform, per the user's Obsidian-style sizing proposal.
Bug fix first: the eased zoom leaked a queued rAF callback per frame --
advanceZoom applies each step through d3-zoom, whose zoom event called
markDirty() from inside the tick loop, scheduling an extra draw while the
loop scheduled its own. Draws multiplied per displayed frame; sustained
wheel ran at ~20fps against a 120Hz display. markDirty now skips
scheduling while inTick (verified: 62 frames/500ms during a 28x zoom
burst, matching pan).
World-space model: every draw call now runs in graph coordinates under
one setTransform(k). Sizes are defined as screen-px-at-fit and converted
once per geometry build (/ kFit), so nodes, node labels, arrowheads and
the hover halo scale with the graph as you zoom (0.25x painted area at
half zoom, exactly k^2) while edge widths and hull borders stay
viewer-relative hairlines (/ k). Cluster hull geometry (convex hull +
three offset fills + solid boundary -- dashes dropped for now) is built
as cached Path2Ds per data/visibility/settings change; camera moves do
zero geometry math, making zoom per-frame cost identical to pan. Label
wrapping runs once per build, not per frame. Region labels stay
viewer-relative (18px at any zoom) as UI chrome. Picking radius scales
with the world-sized discs.
Glide feel: ZOOM_EASE_MS 120 -> 45, convergence 0.1% -> 0.2%; a notch now
settles in ~260ms instead of ~750ms. Resize still paints synchronously.
Also fixes barrel-law lint violations from the settings wave (import
from @/src/core and @/src/server, not deep module paths).
Three problems from the first cut (user report 2026-09-13), all rooted
and fixed:
1. Boundaries reshaping on zoom — an inward offset normal. In y-down
screen coordinates, monotone chain yields clockwise-on-screen hulls,
whose OUTWARD normal is (dy, -dx); the code used (-dy, dx), so the
14px padding pulled every hull vertex 14-20px INWARD. Zoomed in this
mostly passed; zoomed out, once a cluster projected smaller than ~2x
the pad, vertices crossed the centroid and the polygon self-
intersected — spiky garbage re-forming every frame. Geometry moved to
components/cluster-geometry.ts (exported, unit-tested) with the
corrected normal; tests pin the direction (offset moves every vertex
AWAY from the centroid; stays sane when the hull is smaller than the
pad; hull orientation asserted clockwise-on-screen).
2. GPU ~100% + audible coil whine on any interaction — the hull redraw
was hooked to sigma's afterRender, which fires for EVERY render
including ~a dozen hover-animation frames per hover, and each redraw
rasterized ~32 fills through ctx.filter blur(12px), a GPU-heavy
full-canvas filter. Now: redraws happen ONLY on camera updates and
resizes (hover leaves the hull canvas untouched — verified live),
and the blur is replaced with layered low-alpha fills (soft edge at
a fraction of the cost, no canvas filter at all).
3. Cluster labels cluttering the view — a persisted 'Cluster labels'
checkbox in the rendering settings (hulls stay, text toggles).
377/377 tests, typecheck, lint, build green. Live-verified: hover does
not repaint hulls, zoom does; far zoom-out yields 3 contiguous tinted
regions (no fragmentation); toggle clears/returns labels and persists.
amosblomqvist