{
  "$schema": "https://uipkge.dev/schema/registry-item.json",
  "name": "bar-race-chart",
  "title": "Bar Race Chart",
  "type": "registry:ui",
  "files": [
    {
      "path": "packages/registry-svelte/components/bar-race-chart/BarRaceChart.svelte",
      "content": "<script lang=\"ts\" module>\n  import type { HTMLAttributes } from 'svelte/elements'\n\n  export interface RaceFrame {\n    /** Frame caption, e.g. a year. */\n    label: string\n    values: { category: string; value: number }[]\n  }\n\n  export interface BarRaceChartProps extends HTMLAttributes<HTMLDivElement> {\n    frames: RaceFrame[]\n    /** Rows shown per frame. Default 8. */\n    topN?: number\n    /** Auto-advance. Default true. */\n    autoPlay?: boolean\n    /** ms per frame. Default 1400. */\n    interval?: number\n    height?: number | string\n    option?: any\n    /** Accessible name announced for the chart image. Defaults to \"Chart\". */\n    ariaLabel?: string\n    /** The wrapper <div>, via `bind:ref`. */\n    ref?: HTMLDivElement | null\n  }\n</script>\n\n<script lang=\"ts\">\n  import { init, use } from 'echarts/core'\n  import type { EChartsType } from 'echarts/core'\n  import { CanvasRenderer } from 'echarts/renderers'\n  import { BarChart as EChartsBarChart } from 'echarts/charts'\n  import { GraphicComponent, GridComponent, LegendComponent, TooltipComponent } from 'echarts/components'\n  import { cn } from '$lib/utils'\n  import { chartTheme, mergeOptionBlock } from './chart-theme.svelte'\n\n  use([CanvasRenderer, EChartsBarChart, GridComponent, TooltipComponent, GraphicComponent, LegendComponent])\n\n  let {\n    class: className,\n    frames,\n    topN = 8,\n    autoPlay = true,\n    interval = 1400,\n    height = 380,\n    option = undefined,\n    ariaLabel = undefined,\n    children,\n    ref = $bindable(null),\n    ...restProps\n  }: BarRaceChartProps = $props()\n\n  // Destructured (not rendered): the chart renders from `frames`, not a slot —\n  // this keeps a stray `children` prop out of the wrapper's spread attributes.\n  void children\n\n  let chartHost = $state<HTMLDivElement | null>(null)\n  let chart: EChartsType | null = null\n\n  let cursor = $state(0)\n\n  $effect(() => {\n    if (!autoPlay || frames.length < 2) return\n    const timer = setInterval(() => {\n      cursor = (cursor + 1) % frames.length\n    }, interval)\n    return () => clearInterval(timer)\n  })\n\n  const frame = $derived(frames[Math.min(cursor, frames.length - 1)] ?? { label: '', values: [] })\n  const rows = $derived(\n    [...frame.values]\n      .sort((a, b) => b.value - a.value)\n      .slice(0, topN)\n      .reverse(),\n  )\n\n  const mergedOption = $derived.by(() => {\n    const max = Math.max(...rows.map((r) => r.value), 1)\n    const series = [\n      {\n        type: 'bar',\n        barWidth: 16,\n        realtimeSort: true,\n        itemStyle: { color: chartTheme.colors[0], borderRadius: [6, 6, 6, 6] },\n        label: { show: true, position: 'right', color: chartTheme.textColor, fontSize: 11, fontWeight: 600 },\n        data: rows.map((r) => r.value),\n      },\n    ]\n    const userOption: any = option ?? {}\n    const {\n      series: userSeries,\n      xAxis: userXAxis,\n      yAxis: userYAxis,\n      grid: userGrid,\n      tooltip: userTooltip,\n      ...userRest\n    } = userOption\n    const mergedSeries = Array.isArray(userSeries) ? series.map((s, i) => ({ ...s, ...(userSeries[i] ?? {}) })) : series\n    return {\n      color: chartTheme.colors,\n      animationDurationUpdate: 900,\n      animationEasingUpdate: 'quinticInOut',\n      graphic: {\n        elements: [\n          {\n            type: 'text',\n            right: 16,\n            bottom: 8,\n            style: { text: frame.label, fontSize: 44, fontWeight: 800, fill: chartTheme.axisColor },\n          },\n        ],\n      },\n      grid: mergeOptionBlock({ left: 16, right: 64, top: 16, bottom: 24, containLabel: true }, userGrid),\n      tooltip: mergeOptionBlock(\n        {\n          trigger: 'axis',\n          axisPointer: { type: 'shadow' },\n          backgroundColor: chartTheme.tooltipBg,\n          borderColor: chartTheme.tooltipBorder,\n          textStyle: { color: chartTheme.tooltipText, fontSize: 12 },\n        },\n        userTooltip,\n      ),\n      legend: { show: false },\n      xAxis: mergeOptionBlock(\n        {\n          type: 'value',\n          max: max * 1.25,\n          splitLine: { lineStyle: { color: chartTheme.splitLineColor } },\n          axisLabel: { color: chartTheme.textColor, fontSize: 11 },\n        },\n        userXAxis,\n      ),\n      yAxis: mergeOptionBlock(\n        {\n          type: 'category',\n          inverse: true,\n          data: rows.map((r) => r.category),\n          axisLine: { show: false },\n          axisLabel: { color: chartTheme.textColor, fontSize: 11, fontWeight: 600 },\n          axisTick: { show: false },\n          animationDuration: 300,\n          animationDurationUpdate: 300,\n        },\n        userYAxis,\n      ),\n      series: mergedSeries,\n      ...userRest,\n    }\n  })\n\n  // Lifecycle owns init/resize/dispose; option pushes ride a separate effect\n  // so re-renders merge into the live chart (no re-init, transitions kept).\n  $effect(() => {\n    const host = chartHost\n    if (!host) return\n    chart ??= init(host)\n    const ro = new ResizeObserver(() => chart?.resize())\n    ro.observe(host)\n    return () => {\n      ro.disconnect()\n      chart?.dispose()\n      chart = null\n    }\n  })\n\n  $effect(() => {\n    if (!chartHost) return\n    chart?.setOption(mergedOption)\n  })\n\n  const heightStyle = $derived(`height: ${/^\\d+$/.test(String(height)) ? `${height}px` : String(height)}`)\n</script>\n\n<div\n  bind:this={ref}\n  role=\"img\"\n  tabindex=\"0\"\n  aria-label={ariaLabel || `Bar race chart, frame ${frame.label}`}\n  style={heightStyle}\n  class={cn('focus-visible:ring-ring w-full focus-visible:ring-2 focus-visible:outline-none', className)}\n  {...restProps}\n>\n  <div bind:this={chartHost} class=\"size-full\"></div>\n</div>\n",
      "type": "registry:ui",
      "target": "~/src/lib/components/ui/bar-race-chart/BarRaceChart.svelte"
    },
    {
      "path": "packages/registry-svelte/components/bar-race-chart/chart-theme.svelte.ts",
      "content": "// Chart palette is driven by Tailwind v4 CSS variables (`--chart-1`..`--chart-5`,\n// `--muted-foreground`, `--border`, `--popover`, etc.) so dark/light flips\n// happen automatically when the consumer toggles their theme class. The\n// values resolve at runtime via `getComputedStyle`, so they pick up whatever\n// the consumer set in their own `tailwind.css` -- no fork required.\n//\n// We bump `themeKey` whenever `<html>` class/style changes (the typical\n// shadcn dark-mode pivot) so every `chartTheme` getter re-resolves and\n// downstream ECharts options re-paint. Getters read `themeKey`, so accessing\n// them inside `$derived` subscribes the chart to theme changes.\n\nlet themeKey = $state(0)\n\nif (typeof window !== 'undefined') {\n  // Bump once on the first paint so post-hydration getComputedStyle reads\n  // the *resolved* CSS values (during SSR-built bundles the very first\n  // pass returns the fallbacks below).\n  requestAnimationFrame(() => themeKey++)\n  new MutationObserver(() => themeKey++).observe(document.documentElement, {\n    attributes: true,\n    attributeFilter: ['class', 'style', 'data-theme'],\n  })\n}\n\n// ECharts' canvas renderer does not accept OKLCH in every browser. Assigning\n// one of our Tailwind tokens to `fillStyle` can silently leave the sentinel\n// colour in place, turning a whole chart black. Convert OKLCH ourselves and\n// let the canvas normalize older CSS colour formats.\nlet _hexCanvas: CanvasRenderingContext2D | null = null\n\nexport function toCanvasColor(cssColor: string): string {\n  const value = cssColor.trim()\n  const match = value.match(\n    /^oklch\\(\\s*([+-]?(?:\\d+\\.?\\d*|\\.\\d+))(%?)\\s+([+-]?(?:\\d+\\.?\\d*|\\.\\d+))\\s+([+-]?(?:\\d+\\.?\\d*|\\.\\d+))(?:deg)?(?:\\s*\\/\\s*([+-]?(?:\\d+\\.?\\d*|\\.\\d+))(%?))?\\s*\\)$/i,\n  )\n\n  if (match) {\n    const lightness = Number(match[1]) / (match[2] === '%' ? 100 : 1)\n    const chroma = Number(match[3])\n    const hue = (Number(match[4]) * Math.PI) / 180\n    const alpha = match[5] == null ? 1 : Number(match[5]) / (match[6] === '%' ? 100 : 1)\n    const a = chroma * Math.cos(hue)\n    const b = chroma * Math.sin(hue)\n\n    const l = Math.pow(lightness + 0.3963377774 * a + 0.2158037573 * b, 3)\n    const m = Math.pow(lightness - 0.1055613458 * a - 0.0638541728 * b, 3)\n    const s = Math.pow(lightness - 0.0894841775 * a - 1.291485548 * b, 3)\n    const linear = [\n      4.0767416621 * l - 3.3077115913 * m + 0.2309699292 * s,\n      -1.2684380046 * l + 2.6097574011 * m - 0.3413193965 * s,\n      -0.0041960863 * l - 0.7034186147 * m + 1.707614701 * s,\n    ]\n    const rgb = linear.map((channel) => {\n      const encoded = channel <= 0.0031308 ? 12.92 * channel : 1.055 * Math.pow(channel, 1 / 2.4) - 0.055\n      return Math.round(Math.min(1, Math.max(0, encoded)) * 255)\n    })\n\n    return alpha < 1 ? `rgba(${rgb.join(', ')}, ${alpha})` : `rgb(${rgb.join(', ')})`\n  }\n\n  if (typeof document === 'undefined') return cssColor\n  if (!_hexCanvas) {\n    _hexCanvas = document.createElement('canvas').getContext('2d')\n  }\n  if (!_hexCanvas) return cssColor\n  _hexCanvas.fillStyle = '#010203'\n  _hexCanvas.fillStyle = value\n  const normalized = _hexCanvas.fillStyle as string\n  return normalized === '#010203' && value.toLowerCase() !== '#010203' ? value : normalized\n}\n\n// Convert any CSS color (hex, rgb, oklch, color()) + alpha 0..1 to a\n// canvas-safe rgba(r,g,b,a). `colorString + '40'` (8-digit hex alpha)\n// only works when `colorString` is `#rrggbb`; once tokens resolve to\n// oklch() post-hydration the gradient stops break and the canvas paint\n// throws every frame. Stay defensive and always return rgba.\nexport function toRgba(cssColor: string, alpha: number): string {\n  const normalized = toCanvasColor(cssColor)\n  if (normalized.startsWith('#') && normalized.length === 7) {\n    const r = parseInt(normalized.slice(1, 3), 16)\n    const g = parseInt(normalized.slice(3, 5), 16)\n    const b = parseInt(normalized.slice(5, 7), 16)\n    return `rgba(${r},${g},${b},${alpha})`\n  }\n  if (normalized.startsWith('rgba(')) {\n    return normalized.replace(/,\\s*[\\d.]+\\s*\\)$/, `,${alpha})`)\n  }\n  if (normalized.startsWith('rgb(')) {\n    return normalized.replace(/^rgb\\(/, 'rgba(').replace(/\\)$/, `,${alpha})`)\n  }\n  // Canvas refused to parse this color -- ship the original string and\n  // let ECharts complain (better than crashing the paint loop).\n  return cssColor\n}\n\nfunction resolveVar(name: string, fallback: string): string {\n  if (typeof window === 'undefined') return fallback\n  const v = getComputedStyle(document.documentElement).getPropertyValue(name).trim()\n  if (!v) return fallback\n  return toCanvasColor(v)\n}\n\n// SSR / pre-hydration fallback palette. Hex values picked to roughly\n// match the shadcn Neutral defaults in `tailwind.css` so the first paint\n// doesn't flicker.\nconst CHART_FALLBACK = ['#f59e0b', '#14b8a6', '#3b82f6', '#f97316', '#eab308']\n\nfunction touchThemeKey() {\n  // Read inside `$derived` (or any reaction) to subscribe that reaction to\n  // theme flips; a plain read everywhere else.\n  void themeKey\n}\n\nexport const chartTheme = {\n  get colors(): string[] {\n    touchThemeKey()\n    return Array.from({ length: 5 }, (_, i) => resolveVar(`--chart-${i + 1}`, CHART_FALLBACK[i]!))\n  },\n  get textColor(): string {\n    touchThemeKey()\n    return resolveVar('--muted-foreground', '#888888')\n  },\n  get axisColor(): string {\n    touchThemeKey()\n    return resolveVar('--border', '#e5e5e5')\n  },\n  get splitLineColor(): string {\n    touchThemeKey()\n    return resolveVar('--border', '#f0f0f0')\n  },\n  get tooltipBg(): string {\n    touchThemeKey()\n    return resolveVar('--popover', 'rgba(255,255,255,0.96)')\n  },\n  get tooltipBorder(): string {\n    touchThemeKey()\n    return resolveVar('--border', '#e5e5e5')\n  },\n  get tooltipText(): string {\n    touchThemeKey()\n    return resolveVar('--popover-foreground', '#333333')\n  },\n  get bgColor(): string {\n    touchThemeKey()\n    return resolveVar('--card', resolveVar('--background', '#ffffff'))\n  },\n  // The app's accent, for the one highlighted element on a chart or map — a\n  // selected route, a focused bar. Category series keep using chartTheme.colors.\n  get accentColor(): string {\n    touchThemeKey()\n    return resolveVar('--primary', '#38bdf8')\n  },\n  // Out-of-bounds / failure colour for charts that encode good vs bad rather\n  // than a category — control limits, error series. CSS-level marks can use\n  // `var(--destructive)` directly; this exists because ECharts needs a resolved\n  // colour string on the canvas.\n  get dangerColor(): string {\n    touchThemeKey()\n    return resolveVar('--destructive', '#dc2626')\n  },\n}\n\n// Two-level deep merge for ECharts option blocks (xAxis, yAxis, grid,\n// tooltip, legend, singleAxis, parallel, etc.). The top-level keys merge\n// shallowly, but one nested level (axisLabel, axisLine, splitLine, etc.)\n// merges shallowly too so a consumer passing `xAxis: { axisLabel: { fontSize: 9 } }`\n// doesn't blow away the wrapper's `color` + base font defaults on the same\n// axisLabel block. Arrays + primitives replace outright.\n//\n// This is the merge strategy the chart wrappers use to fold `props.option`\n// onto their computed base option without forcing consumers to spell out\n// every default they want to preserve.\nexport function mergeOptionBlock<T extends Record<string, any>>(base: T, user: Partial<T> | undefined): T {\n  if (!user) return base\n  const out: any = { ...base }\n  for (const k of Object.keys(user)) {\n    const bv = (base as any)[k]\n    const uv = (user as any)[k]\n    if (\n      bv != null &&\n      uv != null &&\n      typeof bv === 'object' &&\n      typeof uv === 'object' &&\n      !Array.isArray(bv) &&\n      !Array.isArray(uv)\n    ) {\n      out[k] = { ...bv, ...uv }\n    } else {\n      out[k] = uv\n    }\n  }\n  return out\n}\n\n// Default gauge stoplight: teal (safe) -> amber (warning) -> red (danger).\n// Pulled off saturated green and onto teal so the gauge ties back to the\n// dashboard palette; red is kept as the universal \"limit reached\" cue.\n// GaugeChart consumes this via its `thresholds` prop default; consumers\n// pass their own array to override. Static because gauges have semantic\n// meaning (green safe / red danger) that we deliberately don't theme-flip.\nexport const gaugeThresholds: [number, string][] = [\n  [0.6, '#14b8a6'],\n  [0.85, '#f59e0b'],\n  [1, '#dc2626'],\n]\n",
      "type": "registry:ui",
      "target": "~/src/lib/components/ui/bar-race-chart/chart-theme.svelte.ts"
    },
    {
      "path": "packages/registry-svelte/components/bar-race-chart/index.ts",
      "content": "export { default as BarRaceChart, type BarRaceChartProps, type RaceFrame } from './BarRaceChart.svelte'\n",
      "type": "registry:ui",
      "target": "~/src/lib/components/ui/bar-race-chart/index.ts"
    }
  ],
  "dependencies": [
    "echarts"
  ],
  "devDependencies": [],
  "registryDependencies": [],
  "description": "Animated bar-race chart around Apache ECharts. Auto-advancing ranked frames with smooth resort transitions. Theme-aware via registry tokens.",
  "categories": [
    "chart"
  ]
}