{
  "$schema": "https://uipkge.dev/schema/registry-item.json",
  "name": "gauge-chart",
  "title": "Gauge Chart",
  "type": "registry:ui",
  "files": [
    {
      "path": "packages/registry-svelte/components/gauge-chart/GaugeChart.svelte",
      "content": "<script lang=\"ts\" module>\n  import type { HTMLAttributes } from 'svelte/elements'\n\n  export interface GaugeChartProps extends HTMLAttributes<HTMLDivElement> {\n    value: number\n    min?: number\n    max?: number\n    unit?: string\n    label?: string\n    height?: number | string\n    /** Colour stops as [percentage, hex] pairs. Default: teal->amber->red,\n     *  pulled from `gaugeThresholds` in useChartTheme so the safe-zone\n     *  colour ties back to the dashboard palette. Pass your own to override. */\n    thresholds?: [number, string][]\n    option?: any\n    /** Accessible name announced for the chart image. Defaults to \"Chart\". */\n    ariaLabel?: string\n    ref?: HTMLDivElement | null\n  }\n</script>\n\n<script lang=\"ts\">\n  import { init as echartsInit, use as echartsUse, type ECharts, type EChartsCoreOption } from 'echarts/core'\n  import { CanvasRenderer } from 'echarts/renderers'\n  import { GaugeChart as EChartsGaugeChart } from 'echarts/charts'\n  import { TooltipComponent } from 'echarts/components'\n  import { cn } from '$lib/utils'\n  import {\n    chartColors,\n    chartTextColor,\n    chartTooltipBg,\n    chartTooltipBorder,\n    chartTooltipText,\n    gaugeThresholds,\n  } from './useChartTheme.svelte'\n\n  echartsUse([CanvasRenderer, EChartsGaugeChart, TooltipComponent])\n\n  let {\n    class: className,\n    value,\n    min = 0,\n    max = 100,\n    unit = '',\n    label,\n    height = 220,\n    thresholds = gaugeThresholds,\n    option,\n    ariaLabel,\n    ref = $bindable(null),\n    ...restProps\n  }: GaugeChartProps = $props()\n\n  let chart = $state<ECharts | null>(null)\n  let chartEl = $state<HTMLDivElement | null>(null)\n\n  const mergedOption = $derived.by((): EChartsCoreOption => {\n    const series = [\n      {\n        type: 'gauge',\n        min,\n        max,\n        center: ['50%', '60%'],\n        radius: '85%',\n        startAngle: 200,\n        endAngle: -20,\n        progress: { show: true, width: 14, itemStyle: { color: chartColors()[0] } },\n        pointer: { show: true, length: '55%', width: 4, itemStyle: { color: chartColors()[0] } },\n        axisLine: {\n          lineStyle: {\n            width: 14,\n            color: thresholds.map(([stop, color]) => [stop, color] as [number, string]),\n          },\n        },\n        axisTick: { distance: -22, length: 4, lineStyle: { color: chartTextColor(), width: 1 } },\n        splitLine: { distance: -26, length: 8, lineStyle: { color: chartTextColor(), width: 2 } },\n        axisLabel: { color: chartTextColor(), fontSize: 10, distance: -34 },\n        anchor: { show: false },\n        title: {\n          offsetCenter: [0, '88%'],\n          color: chartTextColor(),\n          fontSize: 11,\n          fontWeight: 500,\n        },\n        detail: {\n          valueAnimation: true,\n          formatter: `{value}${unit ? ' ' + unit : ''}`,\n          color: chartColors()[0],\n          fontSize: 28,\n          fontWeight: 700,\n          offsetCenter: [0, '40%'],\n        },\n        data: [{ value, name: label ?? '' }],\n      },\n    ]\n\n    // Per-index series merge — partial overrides keep computed `type`/`data`.\n    const userOption: any = option ?? {}\n    const { series: userSeries, ...userRest } = userOption\n    const mergedSeries = Array.isArray(userSeries)\n      ? series.map((s, i) => ({ ...s, ...(userSeries[i] ?? {}) }))\n      : series\n\n    return {\n      tooltip: {\n        formatter: '{b}: {c}' + (unit ? ` ${unit}` : ''),\n        backgroundColor: chartTooltipBg(),\n        borderColor: chartTooltipBorder(),\n        textStyle: { color: chartTooltipText(), fontSize: 12 },\n      },\n      series: mergedSeries,\n      ...userRest,\n    }\n  })\n\n  $effect(() => {\n    if (!chartEl) return\n    const el = chartEl\n    const instance = echartsInit(el)\n    chart = instance\n    const ro = new ResizeObserver(() => instance.resize())\n    ro.observe(el)\n    return () => {\n      ro.disconnect()\n      instance.dispose()\n      if (chart === instance) chart = null\n    }\n  })\n\n  $effect(() => {\n    chart?.setOption(mergedOption, { notMerge: true })\n  })\n</script>\n\n<!-- tabindex on role=img mirrors the Vue twin: keyboard users can focus the\n     chart; the focus ring aids orientation. -->\n<!-- svelte-ignore a11y_no_noninteractive_tabindex -->\n<div\n  bind:this={ref}\n  role=\"img\"\n  tabindex=\"0\"\n  aria-label={ariaLabel || 'Chart'}\n  style={`height: ${/^\\d+$/.test(String(height)) ? `${height}px` : String(height)}`}\n  class={cn('focus-visible:ring-ring w-full focus-visible:ring-2 focus-visible:outline-none', className)}\n  data-uipkge\n  data-slot=\"gauge-chart\"\n  {...restProps}\n>\n  <div bind:this={chartEl} class=\"size-full\"></div>\n</div>\n",
      "type": "registry:ui",
      "target": "~/src/lib/components/ui/charts/gauge-chart/GaugeChart.svelte"
    },
    {
      "path": "packages/registry-svelte/components/gauge-chart/index.ts",
      "content": "export { default as GaugeChart, type GaugeChartProps } from './GaugeChart.svelte'\n",
      "type": "registry:ui",
      "target": "~/src/lib/components/ui/charts/gauge-chart/index.ts"
    },
    {
      "path": "packages/registry-svelte/components/gauge-chart/useChartTheme.svelte.ts",
      "content": "// Chart palette is driven by Tailwind v4 CSS variables (`--chart-1`..`--chart-5`,\n// `--muted-foreground`, `--border`, `--popover`, etc.) so dark/light flips\n// happen automatically when the consumer toggles their theme class. The\n// values resolve at runtime via `getComputedStyle`, so they pick up whatever\n// the consumer set in their own `tailwind.css` -- no fork required.\n//\n// We bump `themeKey` whenever `<html>` class/style changes (the typical\n// shadcn dark-mode pivot) so every consumer re-resolves and downstream\n// ECharts options re-paint. Each getter below reads `themeKey`, so calling\n// one inside `$derived` subscribes that derivation to theme flips.\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\nexport function chartColors(): string[] {\n  void themeKey\n  return Array.from({ length: 5 }, (_, i) => resolveVar(`--chart-${i + 1}`, CHART_FALLBACK[i]!))\n}\n\nexport function chartTextColor(): string {\n  void themeKey\n  return resolveVar('--muted-foreground', '#888888')\n}\n\nexport function chartAxisColor(): string {\n  void themeKey\n  return resolveVar('--border', '#e5e5e5')\n}\n\nexport function chartSplitLineColor(): string {\n  void themeKey\n  return resolveVar('--border', '#f0f0f0')\n}\n\nexport function chartTooltipBg(): string {\n  void themeKey\n  return resolveVar('--popover', 'rgba(255,255,255,0.96)')\n}\n\nexport function chartTooltipBorder(): string {\n  void themeKey\n  return resolveVar('--border', '#e5e5e5')\n}\n\nexport function chartTooltipText(): string {\n  void themeKey\n  return resolveVar('--popover-foreground', '#333333')\n}\n\nexport function chartBgColor(): string {\n  void themeKey\n  return resolveVar('--card', resolveVar('--background', '#ffffff'))\n}\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 chartColors.\nexport function chartAccentColor(): string {\n  void themeKey\n  return resolveVar('--primary', '#38bdf8')\n}\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.\nexport function chartDangerColor(): string {\n  void themeKey\n  return resolveVar('--destructive', '#dc2626')\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/charts/useChartTheme.svelte.ts"
    }
  ],
  "dependencies": [
    "echarts"
  ],
  "devDependencies": [],
  "registryDependencies": [],
  "description": "Gauge / speedometer wrapper around Apache ECharts. Threshold-banded stoplight (teal/amber/red), progress-ring, and multi-needle variants. Theme-aware via registry tokens.",
  "categories": [
    "chart"
  ]
}