Force-directed graph · glm-5.3-flash

Build a single index.html with d3 force graph. Straightforward.

The framing is off — some nodes out of view. fitInitial was computed right after 300 ticks, but then simulation restarted and nodes moved, so initialTransform no longer matches current layout. Better: after settle, set simulation alphaTarget 0 and wait; simpler: keep initialTransform computed at load, and on reset recompute? "Reset view" should restore initial framing — acceptable if framing = initial framing at load. But graph drifts out of view since simulation keeps moving. Improve: pin initial transform to latest layout? Simpler approach: on reset click, save transform if first click? Task: "Reset view to restore the initial camera framing." Make simulation cool down quickly (alphaDecay default) and compute initial transform after nodes have mostly settled. Let simulation run ~1.5s, then fit and save. But user could pan before that. Use: on first reset click, if initialTransform is null, fit; also fit on load after settle via setTimeout.

Actually simplest fix: pre-tick 300 iterations makes layout deterministic-ish already, then restart causes drift because alpha restarts at 1. Set simulation alpha to low after pre-tick: simulation.alpha(0.02).restart()? Then little movement. But positions were pre-ticked with alpha starting 1... fine. Set nodes fixed? No.

Plan: after pre-tick, call simulation.alpha(0.05).restart(); and fitInitial/saveInitial immediately. Remaining small drift negligible. Also reset uses saved initialTransform. Test again.

Still cut off. Problem: fitInitial uses fixed width/height captured at load; but also the "center" force keeps recentering nodes toward width/2, but layout pre-ticked fine; the transform computed should fit the extent... Actually the issue: k capped at 2, min? k = min(width/(dx+100), ...). dx maybe ~1300, width 1200 → k≈0.85; that should fit. But screenshot shows overflow — maybe the screenshot is pre-tick state? No — labels match ticked positions. Wait, fitInitial was called BEFORE drift? Nodes at edges beyond viewport. Maybe transform applied but g coordinates are pre-restart, then simulation moves nodes (forceCenter pulls to 600,400) while transform stays. With alpha 0.03 still some drift, plus forceCenter recentering vs fit transform conflicts.

Simplest robust fix: drop forceCenter (positions already fine from pre-tick), set k lower (fit with margin), and clamp? Let's compute: it's fine as long as nodes don't move. Set alpha(0.005) essentially frozen? Then dragging uses alphaTarget 0.3 which restarts movement — fine.

Also the initial framing should be computed on the final positions. Alternative: make reset recompute fit from current positions but keep "initial framing" semantics — spec says reset restores initial framing. I'll compute framing once at load with frozen sim.

Now without center force, pre-tick started nodes at (0,0) so they exploded hugely without centering. Restore center force during pre-tick, then remove it. Do: add forceCenter, pre-tick, then remove center force and freeze.

Still same cutoff. So fitInitial isn't producing a proper fit? Compute: extent from screenshot roughly x 120–1200+, y 0–800. Nodes outside viewport at top (green at y~0) — so the transform k maybe computed then a node moved. Hmm, maybe positions in fitInitial differ: screenshot nodes are same as before, suggesting framing never moved anything, i.e. transform ≈ identity. Maybe fitInitial's computed k... If transform were identity, it means fit transform ≈ identity. Possible if xs spread ~ width. Let me debug in browser console via inspect... use browser key? No console eval tool. Add a quick debug: write values into DOM title. Alternatively reason: maybe the transform got applied but then... link drag? Actually svg.call(zoom) then zoom.transform in transition — screenshot taken at +0ms, transitions 500ms not done! Screenshot may be captured before transition completes. Take another screenshot now.

Now the graph is fully within view. Good — earlier screenshot was mid-transition. Now test interactions: hover, drag, pan, zoom, reset. Use browser drag on a node, then screenshot.

Hover highlight works (node 0 with neighbors 1, 9, 10, 30... actually 0,1,9,10,30 shown, plus ring neighbors 19/21? shown faint—correct). Now drag node: drag from node 0 (380,209) to elsewhere and screenshot.

Node 0 dragged to (890,592); its links followed (long lines to neighbors 1, 9, 10, 30). Camera stayed. Now test zoom (wheel) and reset.

Zoom happened but zoomed into empty area (graph moved off-screen — expected for zoom at cursor after drag moved node; camera response works). Now click Reset view.

Screenshot at +0ms — the reset transition (500ms) hasn't rendered yet. Take another screenshot.

Reset restored the initial camera framing (initial transform), but the dragged node 0 is now pulled back toward neighbors, so some nodes near edges slightly clipped (node 37 at x=1151 fine, some top cut). The initial framing no longer fully contains layout after drag, but it does restore the initial camera — that matches the spec ("restore the initial camera framing without replacing the graph data"). Nodes near edges slightly cut; acceptable but could add margin. Slight clipping at top (node near y=0). Improve by adding larger margin (e.g., +160) and cap k at 1.5.

Still mid-transition at +0ms screenshot. Take a later screenshot.

Now everything fits with margins, four colored clusters visible. Quick final check: pan background then reset works (already verified pattern), hover verified. Done. Report.