Contenu du pack

Un fichier SKILL.md (le guide pratique) + un modèle de départ. Aperçu :

Chart Viewport Scan

When to use

• A chart is too wide or too dense to read at full-frame scale (a 12-month timeline, a 40-bar ranking, a scatter with a crowded corner)
• You want to walk the viewer through a chart left-to-right or along its story, instead of dumping the whole thing on screen at once
• A dashboard has one region that matters and the rest is context — the scan travels from context to focus
• A before/after comparison lives at opposite ends of one long chart
• A chart reveal needs motion with a purpose: the camera moves because the data has a direction, not because the frame looked static

Workflow

1. Map the scan path (input: chart → output: ordered list of 2–5 waypoints)
   Mark the waypoints the viewport will visit, in the order the story needs: usually left-to-right along the x-axis, or context → focus. Each waypoint = one readable region (a cluster of bars, one axis segment, one outlier) with a one-line narration note. Keep it to 2–5 waypoints; a scan with eight stops is a slideshow wearing a camera costume. The first waypoint should include enough of the chart's axes and labels that the viewer can orient before the camera starts moving.
2. Set the viewport size (input: waypoints → output: zoom level per waypoint)
   At each waypoint, the viewport frames exactly that region with a 10–15% margin — tight enough to read the smallest label, loose enough that bars are not clipped mid-bar. All waypoints share one zoom philosophy: if the first waypoint is at 150% zoom, the rest should be within ±25% of it unless a waypoint is deliberately a pull-back for context. Zoom whiplash (180% → 90% → 200%) makes viewers seasick; a scan should feel like leaning in, not teleporting.
3. Animate the travel (input: waypoints → output: pan/zoom keyframes)
   Travel between waypoints takes 1.2–2.0 s, with ease-in-out on both pan and zoom so the camera accelerates out of a stop and decelerates into the next. Pan and zoom happen together in a single move — never zoom first then pan, or the path kinks. Between waypoints, the camera never stops mid-path; every pause happens at a waypoint, where it holds still for the narration (1.5–3 s per stop, matched to the spoken line).
4. Add the scan line (input: viewport path → output: scan-line overlay)
   A thin vertical or horizontal line (2 px, high-contrast) travels with the viewport's leading edge and marks the current reading position on the chart. It is a pointer, not a decoration: it sits exactly where the narration is. When the camera holds at a waypoint, the scan line holds too, parked on the specific bar, point, or threshold being discussed. If the narration names a value ("this bar, 42%"), the scan line touches that bar while the words land.
5. End on the full view or the takeaway (input: final waypoint → output: ending frame)
   End one of two ways: pull back to the full chart (1.5 s ease-out zoom) so the viewer sees where the scanned regions sit in the whole, or push into the final takeaway region and hold it as the end card. Pull-back suits "now you see the pattern"; hold suits "remember this one number." Never end mid-travel — the last frame must be a deliberate still, held ≥2 s.

Aperçu du modèle

Chart Viewport Scan — Production Template

One chart, one continuous scan. Plan the path before animating a single keyframe.

Chart: {chart title / file} — Source resolution: {≥2× delivery}

Full chart shows: {what the whole chart says in one line}

Scan path (2–5 waypoints, story order)

Legend: [ ] Inside waypoint 1 frame [ ] Corner overlay for whole scan

Camera

• Travel between waypoints: {1.2–2.0 s}, ease-in-out, pan + zoom in one move
• Viewport margin at each stop: {10–15%} — no bar clipped mid-bar
• No mid-path pauses: [ ] Confirmed

Scan line

• Thickness: {2 px} | Color: {high-contrast vs chart}

Le pack de compétence lui-même (SKILL.md + modèle) est rédigé en anglais.

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