Constellation Map Skill

Converts a mind map PNG into a physics-based interactive HTML constellation visualization.

Workflow

Follow these four steps in order. Do not skip the JSON confirmation step.

Step 1 — Parse the Image

Carefully read every node and connector in the uploaded image. Extract:

• Root node — the central/leftmost topic
• Branch nodes — direct children of root (level 1)
• Sub nodes — children of branch nodes (level 2), if present
• Leaf nodes — outermost nodes with no further children

Preserve all label text exactly as written in the image.

Output a JSON summary before writing any code:

{
  "root": "Root Label",
  "branches": [
    {
      "id": "b1",
      "label": "Branch Label",
      "kids": ["Leaf 1", "Leaf 2"]
    },
    {
      "id": "b2",
      "label": "Branch Label",
      "subs": [
        { "id": "b2_s0", "label": "Sub Label", "kids": ["Leaf A", "Leaf B"] }
      ]
    }
  ]
}

Ask the user to confirm the structure is correct before proceeding.

Step 2 — Assign Branch Colors

Assign one color slot per branch, cycling through the palette if there are more than 6:

• Sub nodes: lighter tint of the branch fill
• Leaf nodes: even lighter tint
• Root node: fill #ffffff, glow #a0c8ff, label #03060f

Step 3 — Build the HTML File

Produce a single self-contained HTML file. No external dependencies.

#### Canvas & Container

<div style="background:#03060f;border-radius:16px;overflow:hidden;
            position:relative;user-select:none;">
  <canvas id="c" style="display:block;width:100%;touch-action:none;"></canvas>
  <div id="tip" style="position:absolute;pointer-events:none;display:none;
       background:rgba(5,10,28,0.95);border:1px solid rgba(255,255,255,0.18);
       border-radius:10px;padding:9px 14px;z-index:20;"></div>
  <div style="position:absolute;bottom:10px;left:50%;transform:translateX(-50%);
       color:rgba(255,255,255,0.35);font-size:11px;font-family:sans-serif;
       pointer-events:none;">drag any star · click branch to focus</div>
</div>

#### Canvas Setup

• Size: full container width, height = max(600px, width * 0.8)
• HiDPI support via devicePixelRatio
• Background: #03060f
• 200 background stars with sine-wave twinkle animation

#### Node Sizes

All non-leaf nodes get an inner bright core: rgba(255,255,255,0.35) circle at r * 0.4.

#### Labels

• Branch nodes: short label inside node (truncate >12 chars with …), full label floating outside
• All non-root nodes: floating label in a pill rgba(3,6,15,0.7) background, borderRadius:4, positioned radially outward from canvas center
• Hover: full opacity; non-hovered branches: 0.7 opacity; focused-out: 0.1 opacity

#### Edges

• Branch→root: lineWidth 2, solid, shadowBlur 6
• Sub→branch: lineWidth 1, solid
• Leaf→parent: lineWidth 1, dashed [4,5]
• Color: branch glow color, globalAlpha 0.55 (active) or 0.06 (dimmed)

#### Node Layout

Place nodes using polar coordinates from canvas center (W/2, H/2):

• Branch nodes: evenly spaced angles (i / numBranches) * 2π, radius ~0.28 * min(W,H). Use ax/ay offsets scaled by W/900 and H/700.
• Sub nodes: fan from parent at ~0.26 * min(W,H) from center
• Leaf nodes: fan further at 0.28–0.43 * min(W,H) depending on depth
• Store `homeX` and `homeY` on every branch node at build time

⚠️ Critical — root node JavaScript `type` must be `'center'`, not 'root'. The Step 1 JSON schema uses the key "root" for readability, but in the generated JavaScript the root node object must be created with type: 'center'. The physics function guards with n.type === 'center' to exempt the root from all forces. Using any other string will cause the root to drift under repulsion and break the entire layout.

#### Physics

Read references/physics.md for all exact constants and the full physics function implementation.

#### Interactions

⚠️ Critical — physics loop must keep running during drag. The animation loop (requestAnimationFrame) must never pause or skip physics while a node is being dragged. The physics function already skips n === dragging, so the dragged node is positioned directly by the mouse. All other nodes — especially leaves and subs — must continue receiving spring forces every frame so they follow the moved branch naturally. If physics stops during drag, connected leaf/sub nodes will freeze completely and not follow.

Tooltip on hover: Node label (bold 12px white) + type and parent branch name (10px, 45% white). Hidden while dragging.

#### Draw Order Per Frame

1. Clear + fill #03060f
2. Twinkling background stars
3. All edges (with glow)
4. Nodes sorted: leaf → sub → branch → root (root always on top)

Step 4 — Output & Confirm

• Deliver a single .html file
• Confirm all branch labels from the parsed JSON are present in the output
• Mention that branch nodes are anchored (won't drift) and leaves float freely

Quality Checklist

Before finalising, verify:

• [ ] All node labels from Step 1 JSON are present
• [ ] Branch nodes stay near their home positions (anchor spring active)
• [ ] Leaves and subs float gently without flying off screen
• [ ] Focus mode dims other branches correctly
• [ ] Tooltip shows on hover
• [ ] Drag works on mouse and touch
• [ ] Canvas resizes correctly on window resize