Polar Bar Chart
polar-bar-chartuiRadial bar chart on the ECharts polar coordinate system. Categories around the radius axis with rounded caps. Theme-aware via registry tokens.
Installation
$pnpm dlx shadcn-svelte@latest add https://uipkge.dev/r/svelte/polar-bar-chart.json$npx shadcn-svelte@latest add https://uipkge.dev/r/svelte/polar-bar-chart.json$yarn dlx shadcn-svelte@latest add https://uipkge.dev/r/svelte/polar-bar-chart.json$bunx shadcn-svelte@latest add https://uipkge.dev/r/svelte/polar-bar-chart.jsonManifest:
https://uipkge.dev/r/svelte/polar-bar-chart.jsonInstalls to:src/lib/components/ui/polar-bar-chart/Examples
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Props
| Name | Type / Values | Default | Required |
|---|---|---|---|
data | { category: string; value: number }[] | — | required |
height | number | string | 320 | optional |
option | any | — | optional |
ariaLabelAccessible name announced for the chart image. Defaults to "Chart". | string | — | optional |
ref | HTMLDivElement | null | — | optional |
npm dependencies
Used by
Files installed (3)
src/lib/components/ui/polar-bar-chart/PolarBarChart.svelte3.9 kB
<script lang="ts" module> import { use } from 'echarts/core' import { CanvasRenderer } from 'echarts/renderers' import { BarChart as EChartsBarChart } from 'echarts/charts' import { PolarComponent, TooltipComponent, LegendComponent } from 'echarts/components' import type { HTMLAttributes } from 'svelte/elements' use([CanvasRenderer, EChartsBarChart, PolarComponent, TooltipComponent, LegendComponent]) export interface PolarBarChartProps extends HTMLAttributes<HTMLDivElement> { data: { category: string; value: number }[] height?: number | string option?: any /** Accessible name announced for the chart image. Defaults to "Chart". */ ariaLabel?: string ref?: HTMLDivElement | null } </script> <script lang="ts"> import { init as initChart } from 'echarts/core' import type { ECharts } from 'echarts/core' import { cn } from '$lib/utils' import { getChartColors, getChartTextColor, getChartTooltipBg, getChartTooltipBorder, getChartTooltipText, mergeOptionBlock, } from './useChartTheme.svelte' let { class: className, data, height = 320, option, ariaLabel, ref = $bindable(null), ...restProps }: PolarBarChartProps = $props() function buildOption() { const series = [ { type: 'bar', coordinateSystem: 'polar', data: data.map((d) => d.value), colorBy: 'data', roundCap: true, itemStyle: { borderRadius: 6 }, }, ] const userOption: any = option ?? {} const { series: userSeries, polar: userPolar, angleAxis: userAngle, radiusAxis: userRadius, tooltip: userTooltip, legend: userLegend, ...userRest } = userOption const mergedSeries = Array.isArray(userSeries) ? series.map((s, i) => ({ ...s, ...(userSeries[i] ?? {}) })) : series const chartColors = getChartColors() const chartTextColor = getChartTextColor() return { color: chartColors, polar: mergeOptionBlock({ radius: ['18%', '78%'] }, userPolar), angleAxis: mergeOptionBlock( { type: 'value', startAngle: 90, axisLabel: { color: chartTextColor, fontSize: 10 } }, userAngle, ), radiusAxis: mergeOptionBlock( { type: 'category', data: data.map((d) => d.category), axisLabel: { color: chartTextColor, fontSize: 11 }, }, userRadius, ), tooltip: mergeOptionBlock( { trigger: 'item', backgroundColor: getChartTooltipBg(), borderColor: getChartTooltipBorder(), textStyle: { color: getChartTooltipText(), fontSize: 12 }, }, userTooltip, ), legend: userLegend?.show === false ? undefined : mergeOptionBlock({ show: false }, userLegend), series: mergedSeries, ...userRest, } } const mergedOption = $derived(buildOption()) let container = $state<HTMLDivElement | null>(null) let chart: ECharts | null = null $effect(() => { if (!container) return const instance = initChart(container) chart = instance const ro = new ResizeObserver(() => instance.resize()) ro.observe(container) return () => { ro.disconnect() instance.dispose() if (chart === instance) chart = null } }) $effect(() => { chart?.setOption(mergedOption) }) </script> <!-- svelte-ignore a11y_no_noninteractive_tabindex: chart is deliberately focusable so keyboard users reach the labelled image --> <div {...restProps} bind:this={ref} data-uipkge="" data-slot="polar-bar-chart" role="img" tabindex="0" aria-label={ariaLabel || 'Chart'} style:height={/^\d+$/.test(String(height)) ? `${height}px` : String(height)} class={cn('focus-visible:ring-ring w-full focus-visible:ring-2 focus-visible:outline-none', className)} > <div bind:this={container} class="size-full"></div> </div>src/lib/components/ui/polar-bar-chart/index.ts0.1 kB
export { default as PolarBarChart, type PolarBarChartProps } from './PolarBarChart.svelte'src/lib/components/ui/polar-bar-chart/useChartTheme.svelte.ts8.2 kB
// Chart palette is driven by Tailwind v4 CSS variables (`--chart-1`..`--chart-5`, // `--muted-foreground`, `--border`, `--popover`, etc.) so dark/light flips // happen automatically when the consumer toggles their theme class. The // values resolve at runtime via `getComputedStyle`, so they pick up whatever // the consumer set in their own `tailwind.css` -- no fork required. // // We bump the module-level `themeKey` whenever `<html>` class/style changes // (the typical shadcn dark-mode pivot). Every getter below reads the key, so // a `$derived` that calls a getter re-resolves and downstream ECharts options // re-paint. (Svelte twin of the Vue `useChartTheme.ts` computed refs.) let themeKey = $state(0) if (typeof window !== 'undefined') { // Bump once on the first paint so post-hydration getComputedStyle reads // the *resolved* CSS values (during SSR the very first pass returns the // fallbacks below). requestAnimationFrame(() => themeKey++) new MutationObserver(() => themeKey++).observe(document.documentElement, { attributes: true, attributeFilter: ['class', 'style', 'data-theme'], }) } /** Reactive theme version. Called (not read) by getters so `$derived` callers track it. */ export function chartThemeVersion(): number { return themeKey } // ECharts' canvas renderer does not accept OKLCH in every browser. Assigning // one of our Tailwind tokens to `fillStyle` can silently leave the sentinel // colour in place, turning a whole chart black. Convert OKLCH ourselves and // let the canvas normalize older CSS colour formats. let _hexCanvas: CanvasRenderingContext2D | null = null export function toCanvasColor(cssColor: string): string { const value = cssColor.trim() const match = value.match( /^oklch\(\s*([+-]?(?:\d+\.?\d*|\.\d+))(%?)\s+([+-]?(?:\d+\.?\d*|\.\d+))\s+([+-]?(?:\d+\.?\d*|\.\d+))(?:deg)?(?:\s*\/\s*([+-]?(?:\d+\.?\d*|\.\d+))(%?))?\s*\)$/i, ) if (match) { const lightness = Number(match[1]) / (match[2] === '%' ? 100 : 1) const chroma = Number(match[3]) const hue = (Number(match[4]) * Math.PI) / 180 const alpha = match[5] == null ? 1 : Number(match[5]) / (match[6] === '%' ? 100 : 1) const a = chroma * Math.cos(hue) const b = chroma * Math.sin(hue) const l = Math.pow(lightness + 0.3963377774 * a + 0.2158037573 * b, 3) const m = Math.pow(lightness - 0.1055613458 * a - 0.0638541728 * b, 3) const s = Math.pow(lightness - 0.0894841775 * a - 1.291485548 * b, 3) const linear = [ 4.0767416621 * l - 3.3077115913 * m + 0.2309699292 * s, -1.2684380046 * l + 2.6097574011 * m - 0.3413193965 * s, -0.0041960863 * l - 0.7034186147 * m + 1.707614701 * s, ] const rgb = linear.map((channel) => { const encoded = channel <= 0.0031308 ? 12.92 * channel : 1.055 * Math.pow(channel, 1 / 2.4) - 0.055 return Math.round(Math.min(1, Math.max(0, encoded)) * 255) }) return alpha < 1 ? `rgba(${rgb.join(', ')}, ${alpha})` : `rgb(${rgb.join(', ')})` } if (typeof document === 'undefined') return cssColor if (!_hexCanvas) { _hexCanvas = document.createElement('canvas').getContext('2d') } if (!_hexCanvas) return cssColor _hexCanvas.fillStyle = '#010203' _hexCanvas.fillStyle = value const normalized = _hexCanvas.fillStyle as string return normalized === '#010203' && value.toLowerCase() !== '#010203' ? value : normalized } // Convert any CSS color (hex, rgb, oklch, color()) + alpha 0..1 to a // canvas-safe rgba(r,g,b,a). `colorString + '40'` (8-digit hex alpha) // only works when `colorString` is `#rrggbb`; once tokens resolve to // oklch() post-hydration the gradient stops break and the canvas paint // throws every frame. Stay defensive and always return rgba. export function toRgba(cssColor: string, alpha: number): string { const normalized = toCanvasColor(cssColor) if (normalized.startsWith('#') && normalized.length === 7) { const r = parseInt(normalized.slice(1, 3), 16) const g = parseInt(normalized.slice(3, 5), 16) const b = parseInt(normalized.slice(5, 7), 16) return `rgba(${r},${g},${b},${alpha})` } if (normalized.startsWith('rgba(')) { return normalized.replace(/,\s*[\d.]+\s*\)$/, `,${alpha})`) } if (normalized.startsWith('rgb(')) { return normalized.replace(/^rgb\(/, 'rgba(').replace(/\)$/, `,${alpha})`) } // Canvas refused to parse this color -- ship the original string and // let ECharts complain (better than crashing the paint loop). return cssColor } function resolveVar(name: string, fallback: string): string { if (typeof window === 'undefined') return fallback const v = getComputedStyle(document.documentElement).getPropertyValue(name).trim() if (!v) return fallback return toCanvasColor(v) } // SSR / pre-hydration fallback palette. Hex values picked to roughly // match the shadcn Neutral defaults in `tailwind.css` so the first paint // doesn't flicker. const CHART_FALLBACK = ['#f59e0b', '#14b8a6', '#3b82f6', '#f97316', '#eab308'] export function getChartColors(): string[] { chartThemeVersion() return Array.from({ length: 5 }, (_, i) => resolveVar(`--chart-${i + 1}`, CHART_FALLBACK[i]!)) } export function getChartTextColor(): string { chartThemeVersion() return resolveVar('--muted-foreground', '#888888') } export function getChartAxisColor(): string { chartThemeVersion() return resolveVar('--border', '#e5e5e5') } export function getChartSplitLineColor(): string { chartThemeVersion() return resolveVar('--border', '#f0f0f0') } export function getChartTooltipBg(): string { chartThemeVersion() return resolveVar('--popover', 'rgba(255,255,255,0.96)') } export function getChartTooltipBorder(): string { chartThemeVersion() return resolveVar('--border', '#e5e5e5') } export function getChartTooltipText(): string { chartThemeVersion() return resolveVar('--popover-foreground', '#333333') } export function getChartBgColor(): string { chartThemeVersion() return resolveVar('--card', resolveVar('--background', '#ffffff')) } // The app's accent, for the one highlighted element on a chart or map — a // selected route, a focused bar. Category series keep using chartColors. export function getChartAccentColor(): string { chartThemeVersion() return resolveVar('--primary', '#38bdf8') } // Out-of-bounds / failure colour for charts that encode good vs bad rather // than a category — control limits, error series. CSS-level marks can use // `var(--destructive)` directly; this exists because ECharts needs a resolved // colour string on the canvas. export function getChartDangerColor(): string { chartThemeVersion() return resolveVar('--destructive', '#dc2626') } // Two-level deep merge for ECharts option blocks (xAxis, yAxis, grid, // tooltip, legend, singleAxis, parallel, etc.). The top-level keys merge // shallowly, but one nested level (axisLabel, axisLine, splitLine, etc.) // merges shallowly too so a consumer passing `xAxis: { axisLabel: { fontSize: 9 } }` // doesn't blow away the wrapper's `color` + base font defaults on the same // axisLabel block. Arrays + primitives replace outright. // // This is the merge strategy the chart wrappers use to fold `props.option` // onto their computed base option without forcing consumers to spell out // every default they want to preserve. export function mergeOptionBlock<T extends Record<string, any>>(base: T, user: Partial<T> | undefined): T { if (!user) return base const out: any = { ...base } for (const k of Object.keys(user)) { const bv = (base as any)[k] const uv = (user as any)[k] if ( bv != null && uv != null && typeof bv === 'object' && typeof uv === 'object' && !Array.isArray(bv) && !Array.isArray(uv) ) { out[k] = { ...bv, ...uv } } else { out[k] = uv } } return out } // Default gauge stoplight: teal (safe) -> amber (warning) -> red (danger). // Pulled off saturated green and onto teal so the gauge ties back to the // dashboard palette; red is kept as the universal "limit reached" cue. // GaugeChart consumes this via its `thresholds` prop default; consumers // pass their own array to override. Static because gauges have semantic // meaning (green safe / red danger) that we deliberately don't theme-flip. export const gaugeThresholds: [number, string][] = [ [0.6, '#14b8a6'], [0.85, '#f59e0b'], [1, '#dc2626'], ]
Raw manifest:https://uipkge.dev/r/svelte/polar-bar-chart.json