# chart-animation

Teaches agents to generate data-driven chart animations and bar chart races using Remotion and D3. Prevents desync and flicker during frame rendering.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 1200 installs · ★ 15
- Author: iart-ai
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/iart-ai/data-animation-skills/tree/HEAD/skills/chart-animation/SKILL.md
- Updated: 2026-06-22
- HTML: https://affpapa.org/en/nevibecode/skills/chart-animation

## What it does

The skill guides agents through building animated data visualizations: bar chart races, running counters, and dynamic line reveals. Its core rule is deterministic rendering. Every animated number, position, and height must be a pure function of `useCurrentFrame()` rather than relying on wall-clock timers.

Standard transitions from Chart.js, GSAP, or D3 `.transition()` break during headless video rendering because their internal clocks diverge from the renderer. D3 is kept solely for linear scales and path math (`scaleLinear`, `scaleBand`). Numbers are rounded before formatting via `Intl.NumberFormat` and styled with `tabular-nums` CSS so digit changes do not jitter.

The instructions include strict pacing rules: a 1–1.5 second hold at the start, 0.3–0.6 seconds per data row, and a final 2–3 second pause for screenshots. Separating component props from the dataset enables batch rendering dozens of video charts from CSV or JSON files using the Remotion CLI.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add iart-ai/data-animation-skills --skill chart-animation -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/chart-animation/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/chart-animation/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add iart-ai/data-animation-skills --skill chart-animation -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/chart-animation/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add iart-ai/data-animation-skills --skill chart-animation -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/chart-animation/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install iart-ai/data-animation-skills chart-animation
```

2. **Manually: put the files in place**
- File: `.github/skills/chart-animation/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add iart-ai/data-animation-skills --skill chart-animation -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/iart-ai/data-animation-skills --path skills/chart-animation
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/chart-animation/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add iart-ai/data-animation-skills --skill chart-animation -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/iart-ai/data-animation-skills/tree/HEAD/skills/chart-animation/SKILL.md

## When to use it
- render smooth bar chart races from tabular CSV records
- animate number tickers without layout shift or digit jitter
- prevent frame desync and flicker in Remotion data renders
- interpolate sparse data rows into continuous rank transitions
- batch render chart video templates across multiple datasets

## Example prompts
- Build a Remotion bar chart race component using data from history.csv
- Create an animated metric counter formatted as currency with tabular numbers
- Write a bash script to batch render the chart template for all JSON files in /data

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: c1246c53187ee871.

BEGIN THIRD-PARTY FILE c1246c53187ee871
````text
---
name: chart-animation
description: This skill should be used when the user asks to "make a bar chart race", "turn a CSV into a video", "build an animated data visualization", "create an animated statistics video", "animate a chart/graph", "make a number counter/ticker", "animate a ranking over time", or "batch-render one chart template across many datasets". Covers data-driven keyframing, value interpolation, rank transitions, counters, pacing, annotation, and template×data batch output.
version: 0.1.0
---

# Data Video

Turn a dataset into a chart that moves with intent: a bar chart race, a growing line, a count-up stat. The craft is mapping numbers to pixels every frame, easing the *value* (not just the opacity), and pacing the data so a viewer can actually read it.

## When to use

- Bar chart race / ranking-over-time (the headline use case).
- Animated line/area reveal, animated counters and number tickers.
- One chart design rendered across many datasets (template × CSV → N videos).

## The one rule that prevents 90% of bugs

**Drive every value from the current frame — never from wall-clock time or a library's internal animation loop.** A video frame is rendered deterministically; if a bar's height comes from a CSS transition or a D3/GSAP/Chart.js animation, it flickers or desyncs because the renderer and the animation clock disagree. Compute the displayed value as a pure function of frame.

```js
import { useCurrentFrame, interpolate } from "remotion";
const frame = useCurrentFrame();
const value = interpolate(frame, [0, 60], [0, 1287], { extrapolateRight: "clamp" });
```

In Remotion, disable all third-party chart animations (`animation: false` in Chart.js, no D3 `.transition()`) and let `useCurrentFrame()` be the only clock. D3 is still great for *scales and shapes* (`scaleLinear`, `scaleBand`, `line()`) — just not its timers.

## Map data → pixels

A chart is two functions: a value scale and a frame interpolator. Keep them separate.

| Layer | Tool | Job |
|---|---|---|
| Value scale | `scaleLinear` / `scaleBand` | data units → px (height, x-position) |
| Frame interpolation | `interpolate` / `spring` | frame → eased progress 0→1 |
| Display value | `round` + `Intl.NumberFormat` | progress → the number a human reads |

```js
import { scaleLinear } from "d3-scale";
const yScale = scaleLinear().domain([0, maxValue]).range([0, chartHeight]);
const barHeight = yScale(interpolate(frame, [0, 45], [0, datum.value], { extrapolateRight: "clamp" }));
```

## Easing value changes
````
END THIRD-PARTY FILE c1246c53187ee871

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First 2546 of 10526 bytes. © iart-ai · MIT · https://github.com/iart-ai/data-animation-skills/tree/HEAD/skills/chart-animation/SKILL.md

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