Force-directed graph · gemma-4-26b-a4b-it

Using the pre-provided d3.min.js (global d3), render an interactive force-directed graph of about 40 nodes in several clusters with draggable nodes, hover highlighting of neighbors, and zoom/pan. Define the sample nodes and links inline.

⛨ sandboxed Open in new tab ↗

transcript · 6 messages

user

assistant

thinking

The user wants a single-page web app in `index.html` that uses a pre-provided `d3.min.js` to render an interactive force-directed graph.

Key requirements:
- Single file `index.html`.
- CSS in `<style>`, JS in `<script>`.
- NO external resources, CDNs, or network requests.
- Use the local `d3.min.js` via `<script src="d3.min.js"></script>`.
- About 40 nodes in several clusters.
- Draggable nodes.
- Hover highlighting of neighbors.
- Zoom/pan functionality.
- Sample nodes and links defined inline.

Plan:
1.  Check if `d3.min.js` exists in the current directory.
2.  Create `index.html` with:
    - Basic HTML structure.
    - CSS for styling (graph container, nodes, links, labels).
    - `<script src="d3.min.js"></script>`.
    - A script block to:
        - Define data (nodes and links) forming clusters.
        - Initialize SVG with zoom/pan.
        - Set up D3 force simulation (charge, center, links, collision).
        - Render links and nodes.
        - Implement drag behavior.
        - Implement hover highlighting.
        - Implement zoom/pan.

Let's start by checking for `d3.min.js`.

→ bash {"command":"ls d3.min.js"}

toolResult

d3.min.js

assistant

thinking

`d3.min.js` is present. Now I will write the `index.html` file.

I'll design the graph data:
- 4 clusters of ~10 nodes each.
- Within each cluster, nodes are highly connected.
- A few inter-cluster links to connect the clusters.

Total nodes: 40.
Links: enough to form clusters.

Design of `index.html`:
- HTML structure: `<!DOCTYPE html>...<div id="graph"></div>...`
- CSS:
    - `body, html { margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; }`
    - `#graph { width: 100vw; height: 100vh; background-color: #f0f0f0; }`
    - `.node { cursor: pointer; stroke: #fff; stroke-width: 1.5px; }`
    - `.link { stroke: #999; stroke-opacity: 0.6; }`
    - `.label { font-family: sans-serif; font-size: 10px; pointer-events: none; }`
- JS:
    - Data generation.
    - SVG setup.
    - Zoom behavior.
    - Force simulation.
    - Render.
    - Interaction (drag, hover).

Let's refine the data generation.
Clusters:
Cluster 0: nodes 0-9
Cluster 1: nodes 10-19
Cluster 2: nodes 20-29
Cluster 3: nodes 30-39

Links within clusters:
For each cluster, connect each node to its neighbor in the cluster (circularly) and a few random ones.
Inter-cluster links:
Connect node 0 to 10, 10 to 20, 20 to 30, etc.

Wait, I should make the data explicit for better control.

```javascript
const nodes = [];
const links = [];

// Create 4 clusters
for (let c = 0; c < 4; c++) {
    const clusterSize = 10;
    const startNode = c * clusterSize;
    for (let i = 0; i < clusterSize; i++) {
        const id = startNode + i;
        nodes.push({ id, cluster: c, name: `Node ${id}` });
        // Connect to previous in cluster
        if (i > 0) {
            links.push({ source: id - 1, target: id });
        } else {
            links.push({ source: startNode + clusterSize - 1, target: startNode });
        }
    }
    // Add some extra connections within the cluster
    for (let i = 0; i < clusterSize; i++) {
        const id = startNode + i;
        const target = startNode + (i + 2) % clusterSize;
        links.push({ source: id, target: target });
    }
}

// Inter-cluster links
links.push({ source: 0, target: 10 });
links.push({ source: 10, target: 20 });
links.push({ source: 20, target: 30 });
links.push({ source: 30, target: 0 });
links.push({ source: 5, target: 15 });
links.push({ source: 15, target: 25 });
links.push({ source: 25, target: 35 });
links.push({ source: 35, target: 5 });
```

Implementation details for D3:
- `d3.zoom()` for zoom/pan.
- `d3.forceSimulation()` with `forceLink`, `forceManyBody`, `forceCenter`, `forceCollide`.
- `simulation.on("tick", ...)` to update positions.
- Dragging: `d3.drag()` with `dragstarted`, `dragged`, `dragended`.
- Hovering:
    - `mouseover`: Highlight neighbors.
    - `mouseout`: Reset highlighting.

I'll use colors based on the cluster.

Let's write the file.

→ write index.html (8139 bytes)

toolResult

Successfully wrote 8139 bytes to index.html

assistant

thinking

Okay, the code is written to `index.html`. It includes:
1. D3.js (via local `d3.min.js`).
2. CSS for styling (dark theme, highlighting, tooltip).
3. Data generation (40 nodes in 4 clusters with intra and inter-cluster links).
4. Force-directed simulation (charge, center, collision, link).
5. Zoom and Pan functionality.
6. Dragging functionality.
7. Hover highlighting (dimming non-neighbors, highlighting neighbors and incident links).
8. A tooltip.
9. Window resize handling.

I have fulfilled all the requirements:
- Single-page web app in `index.html`.
- All CSS and JS inline (except for `d3.min.js` which is provided).
- No external resources.
- 40 nodes in clusters.
- Draggable nodes.
- Hover highlighting of neighbors.
- Zoom/pan.

I should check if `d3.min.js` is actually present. I did that earlier and it was.

I'll just do a final check of the code to ensure everything looks correct.
The `links.forEach` logic for `interLinks` uses `l.source.id` and `l.target.id` in the hover handler, but after simulation starts, `l.source` and `l.target` are objects, not IDs.

Let's review the hover handler:
```javascript
        node.on("mouseover", function(event, d) {
            // Find neighbors
            const neighbors = new Set();
            links.forEach(l => {
                if (l.source.id === d.id) neighbors.add(l.target.id);
                if (l.target.id === d.id) neighbors.add(l.source.id);
            });
```
Actually, in D3 force simulation, `l.source` and `l.target` are indeed replaced by the node objects themselves. So `l.source.id` should work if the nodes have an `id` property.

Wait, one potential issue: `l.source.id` works if `l.source` is a node object. But in the initial `links` array, `source` and `target` are just IDs. D3's `forceLink` transforms them.

Let's check the code again.
The links are created as:
```javascript
                links.push({ source: id, target: nextInCluster });
```
and
```javascript
        interLinks.forEach(([s, t]) => {
            links.push({ source: s, target: t });
        });
```
Then `d3.forceLink(links).id(d => d.id)` is used. This is correct.

One thing to be careful about: `l.source.id` might fail if `l.source` is still an ID (before simulation starts or if something goes wrong). But since `node.on("mouseover", ...)` happens after the simulation is initialized and likely after at least one tick (or at least when `d3.forceLink` has run), `l.source` should be the node object.

However, to be safer and more robust, I should use the fact that `l.source` and `l.target` are node objects.

Actually, a safer way to write the neighbor search:
```javascript
            links.forEach(l => {
                if (l.source.id === d.id) neighbors.add(l.target.id);
                else if (l.target.id === d.id) neighbors.add(l.source.id);
            });
```
Wait, if it's a self-loop or something weird? No, `l.source.id` is fine.

Let's check the `links.forEach` inside the hover handler:
```javascript
            links.forEach(l => {
                if (l.source.id === d.id) neighbors.add(l.target.id);
                if (l.target.id === d.id) neighbors.add(l.source.id);
            });
```
If `l.source` is the object, `l.source.id` is correct.

Wait, if the user hasn't moved the mouse yet, and the simulation hasn't started? No, the simulation starts immediately.

One detail: `link.classed("dimmed", l => l.source.id !== d.id && l.target.id !== d.id);`
After `forceLink` runs, `l.source` and `l.target` are node objects. So `l.source.id` is correct.

Everything seems fine.

I'll just double check the `interLinks` loop.
```javascript
        const interLinks = [
            [0, 10], [10, 20], [20, 30], [30, 0],
            [5, 15], [15, 25], [25, 35], [35, 5],
            [2, 28], [12, 38]
        ];
        interLinks.forEach(([s, t]) => {
            links.push({ source: s, target: t });
        });
```
This is fine.

I'm confident.

One minor thing:
```javascript
            // Highlight neighbor nodes and links
            node.classed("dimmed", n => n.id !== d.id && !neighbors.has(n.id));
            node.classed("highlighted", n => n.id === d.id || neighbors.has(n.id));
```
This uses `n.id`. `n` is a node. That's correct.

```javascript
            link.classed("dimmed", l => l.source.id !== d.id && l.target.id !== d.id);
            link.classed("link-highlighted", l => l.source.id === d.id || l.target.id === d.id);
```
This uses `l.source.id`. `l` is a link. That's correct.

One small improvement: the tooltip might flicker if it's under the mouse and interferes with `mouseover`. But `pointer-events: none` is set on `.tooltip`, so it should be fine.

I'll finalize the `index.html`.

The interactive force-directed graph has been built and saved to `index.html`. ### Features included: - **D3.js Integration**: Uses the provided `d3.min.js`. - **Clustered Data**: Generates 40 nodes organized into 4 distinct clusters with both intra-cluster and inter-cluster connections. - **Interactivity**: - **Draggable Nodes**: Nodes can be repositioned, and the simulation reacts to the movement. - **Hover Highlighting**: Hovering over a node dims all non-neighboring nodes and links, while highlighting the node itself, its immediate neighbors, and the connecting links. - **Zoom & Pan**: Supports mouse wheel zooming and click-and-drag panning to navigate the graph. - **Tooltip**: Displays node information on hover. - **Visuals**: Dark theme with color-coded clusters and smooth transitions. - **Self-contained**: All CSS and JavaScript are inline within the single `index.html` file. ```bash ls index.html ``` `index.html` is now present in the current directory.

TAKE IT TO CODE

A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.

RUN

modelgemma-4-26b-a4b-it

vendorGoogle

harnesspi-agent

generated2026-07-22

EVALUATION

★★★★★ 3/5 partial

Clustered force-directed graph with working drag and zoom, but click/keyboard show no visible hover-highlight effect.

Vision grade · anthropic/claude-sonnet-5

MEASUREMENTS

Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.

idle motion5.7%

on click0.0%

on drag7.0%

on wheel4.2%

on enter + space0.0%

on arrow keys0.0%

on w/a/s/d0.0%

frame spread15.6 / 255

console errors0

js errors none

METRICS

runtime158.1s

tokens in5.8k

tokens out5.4k

cached1.5k

cost / run$0.0021