heatmapuiGrid heatmap wrapper around Apache ECharts with visualMap color ramp. Theme-aware via registry tokens.
Also available for React ->$pnpm dlx shadcn-vue@latest add https://uipkge.dev/r/vue/heatmap.json$npx shadcn-vue@latest add https://uipkge.dev/r/vue/heatmap.json$yarn dlx shadcn-vue@latest add https://uipkge.dev/r/vue/heatmap.json$bunx shadcn-vue@latest add https://uipkge.dev/r/vue/heatmap.jsonnpx shadcn-vue@latest add @uipkge/heatmapInstalls to:app/components/ui/charts/heatmap/| Name | Type / Values | Default | Required |
|---|---|---|---|
data[xIndex, yIndex, value] | [number, number, number][] | — | required |
xLabels | string[] | — | required |
yLabels | string[] | — | required |
height | number | string | 300 | optional |
min | number | — | optional |
max | number | — | optional |
option | any | — | optional |
class | string | — | optional |
ariaLabelAccessible name announced for the chart image. Defaults to "Chart". | string | — | optional |
<script setup lang="ts">
import { computed } from 'vue'
import { use } from 'echarts/core'
import { CanvasRenderer } from 'echarts/renderers'
import { HeatmapChart as EChartsHeatmap } from 'echarts/charts'
import { GridComponent, TooltipComponent, VisualMapComponent } from 'echarts/components'
import VChart from 'vue-echarts'
import { cn } from '@/lib/utils'
import { chartColors, chartTooltipBg, chartTooltipBorder, chartTooltipText } from '../useChartTheme'
use([CanvasRenderer, EChartsHeatmap, GridComponent, TooltipComponent, VisualMapComponent])
interface Props {
data: [number, number, number][] // [xIndex, yIndex, value]
xLabels: string[]
yLabels: string[]
height?: number | string
min?: number
max?: number
option?: any
class?: string
/** Accessible name announced for the chart image. Defaults to "Chart". */
ariaLabel?: string
}
const props = withDefaults(defineProps<Props>(), {
height: 300,
})
const mergedOption = computed(() => {
const values = props.data.map((d) => d[2])
const computedMin = props.min ?? Math.min(...values)
const computedMax = props.max ?? Math.max(...values)
return {
grid: { left: 16, right: 16, top: 16, bottom: 16, containLabel: true },
tooltip: {
position: 'top',
backgroundColor: chartTooltipBg.value,
borderColor: chartTooltipBorder.value,
textStyle: { color: chartTooltipText.value, fontSize: 12 },
formatter: (params: any) =>
`${props.yLabels[params.value[1]]} / ${props.xLabels[params.value[0]]}: ${params.value[2]}`,
},
xAxis: {
type: 'category',
data: props.xLabels,
splitArea: { show: true },
axisLabel: { fontSize: 11 },
axisTick: { show: false },
},
yAxis: {
type: 'category',
data: props.yLabels,
splitArea: { show: true },
axisLabel: { fontSize: 11 },
axisTick: { show: false },
},
visualMap: {
min: computedMin,
max: computedMax,
calculable: true,
orient: 'horizontal',
left: 'center',
bottom: 0,
itemWidth: 12,
itemHeight: 80,
inRange: {
color: [chartColors.value[0]!, chartColors.value[1]!, chartColors.value[2]!],
},
textStyle: { fontSize: 10 },
},
series: (() => {
const series = [
{
type: 'heatmap',
data: props.data,
label: { show: false },
itemStyle: { borderRadius: 2, borderWidth: 0 },
emphasis: {
itemStyle: { shadowBlur: 10, shadowColor: 'rgba(0,0,0,0.2)' },
},
},
]
const userSeries = (props.option as any)?.series
return Array.isArray(userSeries) ? series.map((s, i) => ({ ...s, ...(userSeries[i] ?? {}) })) : series
})(),
// visualMap / tooltip / axes overrides still spread on top — strip
// `series` so it doesn't clobber the merged result above.
...(() => {
const { series: _, ...rest } = (props.option as any) ?? {}
return rest
})(),
}
})
</script>
<template>
<div
role="img"
tabindex="0"
:aria-label="ariaLabel || 'Chart'"
:style="{ height: /^\d+$/.test(String(height)) ? `${height}px` : String(height) }"
:class="cn('focus-visible:ring-ring w-full focus-visible:ring-2 focus-visible:outline-none', props.class)"
>
<VChart :option="mergedOption" :autoresize="true" class="size-full" />
</div>
</template>
export { default as Heatmap } from './Heatmap.vue'
import { computed, ref, type ComputedRef } from 'vue'
// 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 `themeKey` whenever `<html>` class/style changes (the typical
// shadcn dark-mode pivot) so every consuming `computed` re-resolves and
// downstream ECharts options re-paint.
const themeKey = ref(0)
if (typeof window !== 'undefined') {
// Bump once on the first paint so post-hydration getComputedStyle reads
// the *resolved* CSS values (during SSR-built bundles the very first
// computed pass returns the fallbacks below).
requestAnimationFrame(() => themeKey.value++)
new MutationObserver(() => themeKey.value++).observe(document.documentElement, {
attributes: true,
attributeFilter: ['class', 'style', 'data-theme'],
})
}
// 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 const chartColors: ComputedRef<string[]> = computed(() => {
themeKey.value
return Array.from({ length: 5 }, (_, i) => resolveVar(`--chart-${i + 1}`, CHART_FALLBACK[i]!))
})
export const chartTextColor: ComputedRef<string> = computed(() => {
themeKey.value
return resolveVar('--muted-foreground', '#888888')
})
export const chartAxisColor: ComputedRef<string> = computed(() => {
themeKey.value
return resolveVar('--border', '#e5e5e5')
})
export const chartSplitLineColor: ComputedRef<string> = computed(() => {
themeKey.value
return resolveVar('--border', '#f0f0f0')
})
export const chartTooltipBg: ComputedRef<string> = computed(() => {
themeKey.value
return resolveVar('--popover', 'rgba(255,255,255,0.96)')
})
export const chartTooltipBorder: ComputedRef<string> = computed(() => {
themeKey.value
return resolveVar('--border', '#e5e5e5')
})
export const chartTooltipText: ComputedRef<string> = computed(() => {
themeKey.value
return resolveVar('--popover-foreground', '#333333')
})
export const chartBgColor: ComputedRef<string> = computed(() => {
themeKey.value
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 const chartAccentColor: ComputedRef<string> = computed(() => {
themeKey.value
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 const chartDangerColor: ComputedRef<string> = computed(() => {
themeKey.value
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/vue/heatmap.json
