Reactor Charts

The chart surface lives in Reactor.D3.Charts (full guide: docs/guide/charting.md). This skill is the AI-agent quick reference — chart-choice rules, the new *View extension points, and the a11y/accuracy rails you should keep on by default.

Choose the right chart first

Most "my chart looks bad" problems are wrong-chart problems, not styling problems. Cleveland & McGill's perceptual ranking (1984) — accuracy of graphical judgment, best to worst:

position on a common scale > position on non-aligned scales > length / direction / angle > area > volume > shading / color saturation

That ordering is why bars and dots win and why pies lose. Translate it into rules of thumb: