{
  "$schema": "https://uipkge.dev/schema/registry-item.json",
  "name": "line-chart",
  "title": "Line Chart",
  "type": "registry:ui",
  "files": [
    {
      "path": "packages/registry-svelte/components/line-chart/LineChart.svelte",
      "content": "<script lang=\"ts\" module>\n  import type { HTMLAttributes } from 'svelte/elements'\n\n  export interface LineChartProps extends HTMLAttributes<HTMLDivElement> {\n    data: Record<string, any>[]\n    xField?: string\n    yField?: string | string[]\n    /** Line interpolation. Default 'smooth'. */\n    curve?: 'smooth' | 'linear' | 'step' | 'stepStart' | 'stepEnd'\n    /** Stack series cumulatively. Default false. */\n    stacked?: boolean\n    /** Show point markers. Default true. */\n    markers?: boolean\n    /** Dashed stroke on all series (forecast look). Default false. */\n    dashed?: boolean\n    height?: number | string\n    option?: any\n    /** Accessible name announced for the chart image. Defaults to \"Chart\". */\n    ariaLabel?: string\n    ref?: HTMLDivElement | null\n  }\n</script>\n\n<script lang=\"ts\">\n  import { use, init, type ECharts } from 'echarts/core'\n  import { CanvasRenderer } from 'echarts/renderers'\n  import { LineChart as EChartsLineChart } from 'echarts/charts'\n  import {\n    GridComponent,\n    TooltipComponent,\n    LegendComponent,\n    MarkPointComponent,\n    MarkLineComponent,\n    MarkAreaComponent,\n  } from 'echarts/components'\n  import { cn } from '$lib/utils'\n  import { useChartTheme, mergeOptionBlock } from './useChartTheme.svelte'\n\n  use([\n    CanvasRenderer,\n    EChartsLineChart,\n    GridComponent,\n    TooltipComponent,\n    LegendComponent,\n    MarkPointComponent,\n    MarkLineComponent,\n    MarkAreaComponent,\n  ])\n\n  let {\n    data,\n    xField = 'x',\n    yField = 'y',\n    curve = 'smooth',\n    stacked = false,\n    markers = true,\n    dashed = false,\n    height = 300,\n    option,\n    ariaLabel,\n    class: className,\n    ref = $bindable(null),\n    ...restProps\n  }: LineChartProps = $props()\n\n  const mergedOption: any = $derived.by(() => {\n    const theme = useChartTheme()\n    const fields = Array.isArray(yField) ? yField : [yField]\n    const xData = data.map((d) => d[xField])\n\n    const series = fields.map((field, i) => ({\n      name: field,\n      type: 'line',\n      smooth: curve === 'smooth',\n      step:\n        curve === 'step'\n          ? 'middle'\n          : curve === 'stepStart'\n            ? 'start'\n            : curve === 'stepEnd'\n              ? 'end'\n              : false,\n      stack: stacked ? 'lines' : undefined,\n      symbol: markers ? 'circle' : 'none',\n      symbolSize: 6,\n      lineStyle: { width: 2, type: dashed ? 'dashed' : 'solid' },\n      itemStyle: { color: theme.colors[i % theme.colors.length] },\n      data: data.map((d) => d[field]),\n    }))\n\n    // Per-index series merge + 2-level deep merge for axis blocks.\n    const userOption: any = option ?? {}\n    const {\n      series: userSeries,\n      xAxis: userXAxis,\n      yAxis: userYAxis,\n      grid: userGrid,\n      tooltip: userTooltip,\n      legend: userLegend,\n      ...userRest\n    } = userOption\n    const mergedSeries = Array.isArray(userSeries)\n      ? series.map((s, i) => ({ ...s, ...(userSeries[i] ?? {}) }))\n      : series\n\n    const baseLegend =\n      fields.length > 1\n        ? {\n            bottom: 0,\n            icon: 'circle',\n            itemWidth: 8,\n            itemHeight: 8,\n            textStyle: { fontSize: 11, color: theme.textColor },\n          }\n        : undefined\n\n    return {\n      color: theme.colors,\n      grid: mergeOptionBlock(\n        { left: 16, right: 16, top: 24, bottom: fields.length > 1 ? 32 : 24, containLabel: true },\n        userGrid,\n      ),\n      tooltip: mergeOptionBlock(\n        {\n          trigger: 'axis',\n          backgroundColor: theme.tooltipBg,\n          borderColor: theme.tooltipBorder,\n          textStyle: { color: theme.tooltipText, fontSize: 12 },\n        },\n        userTooltip,\n      ),\n      legend: userLegend?.show === false ? undefined : mergeOptionBlock(baseLegend ?? {}, userLegend),\n      xAxis: mergeOptionBlock(\n        {\n          type: 'category',\n          data: xData,\n          axisLine: { lineStyle: { color: theme.axisColor } },\n          axisLabel: { color: theme.textColor, fontSize: 11 },\n          axisTick: { show: false },\n        },\n        userXAxis,\n      ),\n      yAxis: mergeOptionBlock(\n        {\n          type: 'value',\n          splitLine: { lineStyle: { color: theme.splitLineColor } },\n          axisLabel: { color: theme.textColor, fontSize: 11 },\n          axisLine: { show: false },\n          axisTick: { show: false },\n        },\n        userYAxis,\n      ),\n      series: mergedSeries,\n      ...userRest,\n    }\n  })\n\n  let chartEl = $state<HTMLDivElement | null>(null)\n  let chart: ECharts | null = null\n\n  $effect(() => {\n    const el = chartEl\n    if (!el) return\n    chart = init(el)\n    const ro = new ResizeObserver(() => chart?.resize())\n    ro.observe(el)\n    return () => {\n      ro.disconnect()\n      chart?.dispose()\n      chart = null\n    }\n  })\n\n  $effect(() => {\n    chart?.setOption(mergedOption, { notMerge: true, lazyUpdate: true })\n  })\n</script>\n\n<!-- Focusable chart image mirrors the Vue/React twins for keyboard users. -->\n<!-- svelte-ignore a11y_no_noninteractive_tabindex -->\n<div\n  bind:this={ref}\n  data-uipkge=\"\"\n  data-slot=\"line-chart\"\n  role=\"img\"\n  tabindex=\"0\"\n  aria-label={ariaLabel || 'Chart'}\n  style:height={/^\\d+$/.test(String(height)) ? `${height}px` : String(height)}\n  class={cn('focus-visible:ring-ring w-full focus-visible:ring-2 focus-visible:outline-none', className)}\n  {...restProps}\n>\n  <div bind:this={chartEl} class=\"size-full\"></div>\n</div>\n",
      "type": "registry:ui",
      "target": "~/src/lib/components/ui/line-chart/LineChart.svelte"
    },
    {
      "path": "packages/registry-svelte/components/line-chart/index.ts",
      "content": "export { default as LineChart, type LineChartProps } from './LineChart.svelte'\nexport {\n  useChartTheme,\n  mergeOptionBlock,\n  toCanvasColor,\n  toRgba,\n  gaugeThresholds,\n  type ChartTheme,\n} from './useChartTheme.svelte'\n",
      "type": "registry:ui",
      "target": "~/src/lib/components/ui/line-chart/index.ts"
    },
    {
      "path": "packages/registry-svelte/components/line-chart/useChartTheme.svelte.ts",
      "content": "// Chart palette is driven by Tailwind v4 CSS variables (`--chart-1`..`--chart-5`,\n// `--muted-foreground`, `--border`, `--popover`, etc.) so dark/light flips\n// happen automatically when the consumer toggles their theme class. The\n// values resolve at runtime via `getComputedStyle`, so they pick up whatever\n// the consumer set in their own `tailwind.css` -- no fork required.\n//\n// `useChartTheme()` reads the module-level `themeKey`, which bumps whenever\n// `<html>` class/style changes (the typical shadcn dark-mode pivot). Call it\n// inside `$derived(...)` so the consuming chart re-resolves and ECharts\n// re-paints on theme flips.\n\n// Shared reactive revision counter. Reads track only when called from a\n// reactive context (`$derived` / `$effect` / template expression).\nlet themeKey = $state(0)\n\nif (typeof window !== 'undefined') {\n  // Bump once on the first paint so post-hydration getComputedStyle reads\n  // the *resolved* CSS values (during SSR-built bundles the very first\n  // read returns the fallbacks below).\n  requestAnimationFrame(() => themeKey++)\n  new MutationObserver(() => themeKey++).observe(document.documentElement, {\n    attributes: true,\n    attributeFilter: ['class', 'style', 'data-theme'],\n  })\n}\n\n// ECharts' canvas renderer does not accept OKLCH in every browser. Assigning\n// one of our Tailwind tokens to `fillStyle` can silently leave the sentinel\n// colour in place, turning a whole chart black. Convert OKLCH ourselves and\n// let the canvas normalize older CSS colour formats.\nlet _hexCanvas: CanvasRenderingContext2D | null = null\n\nexport function toCanvasColor(cssColor: string): string {\n  const value = cssColor.trim()\n  const match = value.match(\n    /^oklch\\(\\s*([+-]?(?:\\d+\\.?\\d*|\\.\\d+))(%?)\\s+([+-]?(?:\\d+\\.?\\d*|\\.\\d+))\\s+([+-]?(?:\\d+\\.?\\d*|\\.\\d+))(?:deg)?(?:\\s*\\/\\s*([+-]?(?:\\d+\\.?\\d*|\\.\\d+))(%?))?\\s*\\)$/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\n/** The resolved chart theme tokens. All values are canvas-safe hex/rgba. */\nexport interface ChartTheme {\n  colors: string[]\n  textColor: string\n  axisColor: string\n  splitLineColor: string\n  tooltipBg: string\n  tooltipBorder: string\n  tooltipText: string\n  bgColor: string\n  /** The app's accent, for the one highlighted element on a chart or map —\n   *  a selected route, a focused bar. Category series keep using `colors`. */\n  accentColor: string\n  /** Out-of-bounds / failure colour for charts that encode good vs bad\n   *  rather than a category — control limits, error series. CSS-level marks\n   *  can use `var(--destructive)` directly; this exists because ECharts needs\n   *  a resolved colour string on the canvas. */\n  dangerColor: string\n}\n\nfunction resolveTheme(): ChartTheme {\n  return {\n    colors: Array.from({ length: 5 }, (_, i) => resolveVar(`--chart-${i + 1}`, CHART_FALLBACK[i]!)),\n    textColor: resolveVar('--muted-foreground', '#888888'),\n    axisColor: resolveVar('--border', '#e5e5e5'),\n    splitLineColor: resolveVar('--border', '#f0f0f0'),\n    tooltipBg: resolveVar('--popover', 'rgba(255,255,255,0.96)'),\n    tooltipBorder: resolveVar('--border', '#e5e5e5'),\n    tooltipText: resolveVar('--popover-foreground', '#333333'),\n    bgColor: resolveVar('--card', resolveVar('--background', '#ffffff')),\n    accentColor: resolveVar('--primary', '#38bdf8'),\n    dangerColor: resolveVar('--destructive', '#dc2626'),\n  }\n}\n\n/**\n * Subscribe to the theme-token palette. Call inside `$derived(...)` — the\n * consuming chart re-resolves (and ECharts re-paints) whenever the consumer\n * flips their dark-mode class on `<html>`. The first client read resolves\n * the real CSS values; SSR / pre-hydration returns the fallback palette.\n */\nexport function useChartTheme(): ChartTheme {\n  // Subscribe to theme flips; the read tracks in reactive contexts.\n  void themeKey\n  return resolveTheme()\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 `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// Static because gauges have semantic meaning (green safe / red danger) that\n// 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/line-chart/useChartTheme.svelte.ts"
    }
  ],
  "dependencies": [
    "echarts"
  ],
  "devDependencies": [],
  "registryDependencies": [],
  "description": "Line chart wrapper around Apache ECharts. Smooth/stepped/dashed lines, multi-series, point markers. Theme-aware via registry tokens.",
  "categories": [
    "chart"
  ]
}