Force-directed graph · deepseek-v4.1-flash

Let me check the directory and the d3 library.

Let me build the index.html. I'll use d3 v7. Need zoom, drag, hover highlight, reset view.

Let me write a self-contained app.

Key pieces:
- 40 nodes, 4 clusters. Cluster c nodes 10c..10c+9. Ring edges within cluster. Cluster hubs 0,10,20,30 ring.
- force simulation with link, charge, center.
- SVG with g viewport for zoom, links, nodes, labels.
- Drag: d3.drag on nodes with fx/fy. Background drag pans (zoom). Need to distinguish: node drag should stop propagation so background pan doesn't happen.
- Zoom on svg, but node drag uses drag behavior. Use zoom filter to exclude when target is node? Actually zoom's default filter excludes... let's set zoom filter to allow only background. Simpler: apply zoom to svg, and node drag events call event.stopPropagation? d3 drag on circles vs zoom on svg—both attached. Node drag: use d3.drag. Zoom listens on svg. mousedown on circle bubbles to svg -> zoom too. Prevent by zoom filter: `(event) => !event.target.closest('.node')`... event.target is the circle. Use filter based on class.

- Reset view: reset transform with transition to d3.zoomIdentity, and reset node positions? "restore the initial camera framing without replacing the graph data." So just reset the zoom transform. Also maybe reheat simulation? "restore the initial camera framing" - just reset camera. But also could reset node positions. I'll reset camera and release fixed positions and restart simulation mildly. Actually the requirement: Reset view restores initial camera framing. I'll do zoom reset. Maybe also re-center. Let's just reset zoom transform. Possibly also reset node positions to initial layout to be safe? That may replace data? No, it mutates positions. The phrase "without replacing the graph data" means don't regenerate nodes. I'll reset zoom only plus restart simulation gently and clear fx/fy. Hmm, clearing fx/fy after dragging is good so graph settles. Let's have reset: clear fx/fy, restart simulation with alpha, reset zoom. That restores initial framing reasonably.

Let me center initial graph. Compute initial positions on circles per cluster then run simulation. Keep within view: fit transform initially to bounds. I'll use initial transform identity and set center/force to viewport center.

Approach: width/height from window. Use zoom transform, initial identity. Simulation centers at width/2,height/2. Should be in view.

Hover: on mouseover node, add class dim to all, highlight node, neighbors, links. Use CSS classes.

Let me write it.

Node color by cluster d3.schemeCategory10 or custom 4 colors.

Edge list: cluster ring edges i->i+1 for each cluster (10 edges each = 40), plus hub ring 0-10,10-20,20-30,30-0 (4). Total 44.

Highlight logic: neighbors via adjacency set.

Labels: text beneath/center nodes.

Let me implement with drag that updates fx/fy on drag, and on end keeps fx/fy? "release lets simulation settle" — set fx=fy=null on end so it settles, or keep fixed? Typically release lets it settle means unpin. I'll set fx=fy=null on end.

Zoom: wheel zoom via d3.zoom. Background drag pan.

Let me write.

Initial graph renders well. Console has no errors (just a sandbox warning). Now test interactions: hover, drag node, pan, zoom, reset.

Let me test hover on a node. Coordinates: node 0 at ~(600,255). Use browser click? For hover I'd need mouse move. The tools don't have hover explicitly, but "click" may trigger mouseenter? Let me inspect via JS to test programmatically. Actually I can use browser action "type"? No. Let me use inspect to check DOM. But to genuinely test, I can evaluate JS? The browser tool doesn't have eval. Hmm.

I can use motion or screenshot after click. Click on node might trigger mouseenter then drag. Let's test drag: drag tool.

First, test drag node 0 from (600,255) to say (750,400). Then screenshot and verify links follow and camera stays. But how to confirm camera stays? Visual screenshot.

Let me drag.

Node 0 moved down to ~(760,470), and its connected links follow (to 1, 5, 9, 10, 30, 20... actually 0 connects to 1,5(ring), and 10,30 hubs). The camera stayed in place (other nodes shifted due to simulation, which is expected). Good.

Now test pan background. Drag from empty area (200,150) to (400,300). Then screenshot. Then zoom with scroll. Then reset.

Let me pan.

Pan worked (graph shifted right/down). Now zoom with wheel. Use action "scroll" delta negative to zoom in. Hover at center maybe.

Zoom worked (zoomed in significantly, centered on (600,400) which was empty due to previous pan). Now click Reset view and verify initial framing restored.

Reset button at (60,30). Click.

Hmm, the Reset didn't seem to restore framing. The screenshot still shows zoomed-in with node 7 at right. Maybe the click didn't register on the button, or the transition timing—the screenshot captured at frame 1 before transition finished. But it says "Frame 1, +0ms". Also it still shows node 7 at same position, meaning no zoom reset happened. Wait the click at (60,30) is over the button. But maybe the browser click triggered a mousedown on svg too? No.

Wait, actually looking again: the screenshot is identical to before. Perhaps the image is stale/reused? Or reset didn't run. Let me re-take screenshot/motion after a delay. Actually the issue: my reset does `svg.transition()...call(zoom.transform, identity)`. But I also have `.filter` that returns false when target is within `.node`. Fine.

But wait — there's a subtle bug: clicking Reset triggers `zoom.transform` transition. However, the button click also might be captured... no.

Hmm, maybe the screenshot is from before the click was processed. Let me take a screenshot now.

Reset worked — the camera reset to identity (nodes back in center, similar to initial framing, though positions resettled slightly after drag). Good.

Now test hover highlight. The tool doesn't have hover. Let me try focusing via a workaround: use `key` or check with inspect. Actually I can't run JS. But I can hover by moving mouse? No hover action. Let me try "motion" maybe? No.

Maybe click on a node triggers mouseenter in this headless browser? The drag earlier would have triggered mouseenter during mousedown. But screenshot after drag showed no highlight (because it was during drag, and mouseleave maybe not fired). Actually the drag screenshot showed nodes not dimmed... hmm node 0 was not highlighted.

Let me try to test hover by using the browser's click on a node? click is a full mousedown/up; mouseenter might fire and persist since pointer stays. Let's click node 0 at ~(600,310). Then screenshot. Note click on node might also start drag but with no movement it's fine.

Actually a concern: the strict "highlight on hover" — I should verify. Let me click a node.

Hover highlight works: node 0 highlighted, neighbors 1, 5(?), 9, 10, 30 highlighted, links to them highlighted gold, rest dimmed. Wait I see 0,1,9,10,30 highlighted and one more (5?) at top barely visible due to dim. Actually neighbor 5 should be highlighted but appears dim in screenshot at (627,232)? Hard to tell. Let me check: node 0's ring neighbors are 1 and 9. Hub neighbors 10 and 30. That's 5 highlighted: 0,1,9,10,30. Yes matches screenshot. Good.

Everything verified. Console only sandbox warning, no errors.

One more consideration: "keep the initial graph within view" — yes. Reset framing restored.

Potential issue: after drag node 0 was moved and the reset restarted simulation, so layout differs slightly from initial but camera reset. That's acceptable per spec.

I should double check hover restore on leave. Since headless, hard. But logic is sound (mouseleave clears). 

Let me also verify no console errors on load: only the sandbox warning. Good.

I'm done. Report.

Actually, one concern: the zoom filter uses event.target.closest. In d3 zoom, when clicking a node, mousedown event target is the circle. `.closest(".node")` returns the g. Good. Also touch events? fine.

Also a subtle issue: dragging a node — d3.drag also calls stopPropagation internally for pointer events? It worked in test. Good.

I think the app is complete. Let me also make sure the file only has inline content and loads d3 locally. Yes.

Final report.