[charts] Add radial bar overview demo with custom overlays#22776
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| const CURRENT_COLOR = '#1976d2'; | ||
| const PREVIOUS_COLOR = '#d32f2f'; |
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might be clearer
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| const CURRENT_COLOR = '#1976d2'; | |
| const PREVIOUS_COLOR = '#d32f2f'; | |
| const COLOR_2025 = '#1976d2'; | |
| const COLOR_2013 = '#d32f2f'; |
| scaleType: 'linear', | ||
| min: 0, | ||
| max: 10, | ||
| minRadius: 130, |
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I assume this will get transformed into a percentage after PR merged :)
| } from '../dataset/europeanYouthTrust'; | ||
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| function TrustTooltipContent() { | ||
| const item = useItemTooltip(); |
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I'm surprised you're using the item and not the axis tooltip. The tooltip content is about both 2013 and 2025. Not only the bar item (2025 values)
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| <Stack | ||
| spacing={0.75} | ||
| sx={{ position: 'absolute', top: 8, left: 8, pointerEvents: 'none' }} | ||
| > | ||
| {items.map((item) => ( |
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might be nice to add a breaking point for mobile view. To make the legend a row
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| /** | ||
| * Reads the polar scales through chart hooks and exposes helpers to place | ||
| * custom SVG relative to the chart center. Returns `null` before the scales | ||
| * are ready. | ||
| */ | ||
| export function usePolarGeometry() { | ||
| const { left, top, width, height } = useDrawingArea(); | ||
| const rotationAxis = useRotationAxis(); | ||
| const radiusAxis = useRadiusAxis(); | ||
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| if (!rotationAxis || !radiusAxis) { | ||
| return null; | ||
| } | ||
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| return { | ||
| cx: left + width / 2, | ||
| cy: top + height / 2, | ||
| angleScale: rotationAxis.scale, | ||
| bandwidth: rotationAxis.scale.bandwidth(), | ||
| radiusScale: radiusAxis.scale, | ||
| point: (radius, angle) => [radius * Math.sin(angle), -radius * Math.cos(angle)], | ||
| }; | ||
| } |
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Look like a nice helper hook
| <RadialBarChart | ||
| dataset={europeanYouthTrust} | ||
| height={600} | ||
| margin={{ top: 24, bottom: 24, left: 24, right: 24 }} |
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You might need extra left/right margin to get the legend visible (60px probably)
I tested with smaller inner radius, and 60px margins on left/right
It does not solve every thing. Maybe at some point the label should be shrink. But I don't have easy solution imediatly
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Summary
Adds an overview demo to the Radial Bars docs page, showcasing the
RadialBarChartwith custom SVG overlays.The demo visualizes average trust in others across Europe (Eurostat
ilc_pw03, population aged 16+) between 2013 and 2025, inspired by The European Correspondent's infographic:Details
childrenand read the polar scales through the publicuseRotationAxis/useRadiusAxis/useDrawingAreahooks (sharedusePolarGeometryhelper) — no internals.dataset/europeanYouthTrust.ts.