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No.253 · Analytics

Slope Chart

How a ranking changed between two periods, one line per item from old rank to new; climbers and fallers take opposite colours, and lines swing when you switch measure.

The prompt

The design brief behind this component — reuse it to regenerate, remix, or explain it.

Build a slope chart of rank changes between two periods in SVG with no chart library. Each item (eight destinations) is a line from its rank in the first period (left column) to its rank in the second (right), with dots at both ends and labels outside each end: name and value on the left, value, name and a ▲3 / ▼2 change on the right. Lines that climbed take one pole of a diverging pair (blue), those that fell the other (red), unchanged ones neutral grey — never status colours — with a small legend. The headline names the biggest climber ("Salalah climbs 4 places"). A Bookings / Revenue switch re-ranks both columns and every line swings to its new positions (700ms, cubic out, interpolating ranks). Hovering an item dims the others (each item's hit area spans its whole line). A Table button shows the values and rank changes.

Notes

Interaction
Switch the measure to re-rank; hover a line to isolate it; use Table for the numbers.
Motion
Re-ranking tweens over 700ms (cubic out); highlight fades 200ms.
Accessibility
The SVG has a summary label; climbers and fallers are marked with ▲/▼ and numbers as well as colour; the table view lists every value and change. Reduced motion jumps to new ranks.
Responsive
The SVG scales with its width; labels stay outside the line ends.
On touch
Tap to highlight; the table view covers precise reading.

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