corr
componentbar-chartsource: ok · hit
Bar Chart
A styled EvilCharts bar chart for comparing categories with stacked, gradient, hatched, and horizontal variants.
npx shadcn add "https://ui.corr.sh/r/bar-chart.json"free
Visual style
gradient
Tags auto-generated by rules on 9/24/2026 — empty means no evidence, not lack of support.
Dependencies
Bundle weight · mediumanimationmotion
chartsrecharts
Registry dependencies
https://ui.corr.sh/r/chart-empty-loading-error.json
Files7 · source cached 10/14/2026, 11:30:03 AM
src/components/evilcharts/charts/bar-chart.tsx
"use client"
import {
type ChartConfig,
ChartContainer,
getColorsCount,
getLoadingData,
LoadingIndicator,
} from "@/components/evilcharts/ui/chart"
import {
EvilBrush,
useEvilBrush,
type EvilBrushRange,
} from "@/components/evilcharts/ui/evil-brush"
import {
ChartTooltip,
ChartTooltipContent,
type TooltipRoundness,
type TooltipVariant,
} from "@/components/evilcharts/ui/tooltip"
import {
ChartLegend,
ChartLegendContent,
type ChartLegendVariant,
} from "@/components/evilcharts/ui/legend"
import {
Bar,
BarChart,
CartesianGrid,
LabelList,
Rectangle,
ReferenceLine,
XAxis,
YAxis,
} from "recharts"
import {
useCallback,
useId,
useMemo,
useRef,
useState,
type ComponentProps,
} from "react"
import {
ChartBackground,
type BackgroundVariant,
} from "@/components/evilcharts/ui/background"
import type { RectRadius } from "recharts/types/shape/Rectangle"
import { motion } from "motion/react"
// Constants
const DEFAULT_BAR_RADIUS = 2
const LOADING_BAR_DATA_KEY = "loading"
const LOADING_ANIMATION_DURATION = 2000 // in milliseconds
type ChartProps = ComponentProps<typeof BarChart>
type XAxisProps = ComponentProps<typeof XAxis>
type YAxisProps = ComponentProps<typeof YAxis>
type LabelListProps = ComponentProps<typeof LabelList>
type BarVariant =
| "default"
| "hatched"
| "duotone"
| "duotone-reverse"
| "gradient"
| "stripped"
type StackType = "default" | "stacked" | "percent"
type BarLayout = "vertical" | "horizontal"
// Validating Types to make sure user have provided valid data according to chartConfig
type ValidateConfigKeys<TData, TConfig> = {
[K in keyof TConfig]: K extends keyof TData ? ChartConfig[string] : never
}
// Extract only keys from TData where the value is a number (not string, boolean, etc.)
type NumericDataKeys<T> = {
[K in keyof T]: T[K] extends number ? K : never
}[keyof T]
type EvilBarChartProps<
TData extends Record<string, unknown>,
TConfig extends Record<string, ChartConfig[string]>,
> = {
chartConfig: TConfig & ValidateConfigKeys<TData, TConfig>
data: TData[]
xDataKey?: keyof TData & string
yDataKey?: keyof TData & string
className?: string
chartProps?: ChartProps
xAxisProps?: XAxisProps
yAxisProps?: YAxisProps
defaultSelectedDataKey?: string | null
barVariant?: BarVariant
stackType?: StackType
layout?: BarLayout
barRadius?: number
barGap?: number
barCategoryGap?: number
showLabels?: boolean
labelListProps?: Omit<LabelListProps, "dataKey">
tickGap?: number
legendVariant?: ChartLegendVariant
// Hide Stuffs
hideTooltip?: boolean
hideCartesianGrid?: boolean
hideLegend?: boolean
// Tooltip
tooltipRoundness?: TooltipRoundness
tooltipVariant?: TooltipVariant
tooltipDefaultIndex?: number
// Interactive Stuffs
enableHoverHighlight?: boolean
isLoading?: boolean
loadingBars?: number
// Glow Effects
glowingBars?: NumericDataKeys<TData>[]
// Brush
showBrush?: boolean
brushHeight?: number
brushFormatLabel?: (value: unknown, index: number) => string
onBrushChange?: (range: EvilBrushRange) => void
// Background
backgroundVariant?: BackgroundVariant
// Buffer Bar - renders last data point bars as hatched/lines style
enableBufferBar?: boolean
}
type EvilBarChartClickable = {
isClickable: true
onSelectionChange?: (selectedDataKey: string | null) => void
}
type EvilBarChartNotClickable = {
isClickable?: false
onSelectionChange?: never
}
type EvilBarChartPropsWithCallback<
TData extends Record<string, unknown>,
TConfig extends Record<string, ChartConfig[string]>,
> = EvilBarChartProps<TData, TConfig> &
(EvilBarChartClickable | EvilBarChartNotClickable)
export function EvilBarChart<
TData extends Record<string, unknown>,
TConfig extends Record<string, ChartConfig[string]>,
>({
chartConfig,
data,
xDataKey,
yDataKey,
className,
chartProps,
xAxisProps,
yAxisProps,
defaultSelectedDataKey = null,
barVariant = "default",
stackType = "default",
layout = "vertical",
barRadius = DEFAULT_BAR_RADIUS,
barGap,
barCategoryGap,
showLabels = false,
labelListProps,
tickGap = 8,
legendVariant,
hideTooltip = false,
hideCartesianGrid = false,
hideLegend = false,
tooltipRoundness,
tooltipVariant,
tooltipDefaultIndex,
isClickable = false,
enableHoverHighlight = false,
isLoading = false,
loadingBars,
glowingBars = [],
showBrush = false,
brushHeight,
brushFormatLabel,
onBrushChange,
onSelectionChange,
backgroundVariant,
enableBufferBar = false,
}: EvilBarChartPropsWithCallback<TData, TConfig>) {
const [selectedDataKey, setSelectedDataKey] = useState<string | null>(
defaultSelectedDataKey
)
const [isMouseInChart, setIsMouseInChart] = useState(false)
const { loadingData, onShimmerExit } = useLoadingData(isLoading, loadingBars)
const chartId = useId().replace(/:/g, "") // Remove colons for valid CSS selectors
// ── Zoom state ──────────────────────────────────────────────────────────
const { visibleData, brushProps } = useEvilBrush({ data })
const displayData = showBrush && !isLoading ? visibleData : data
// Wrapper function to update state and call parent callback
const handleSelectionChange = useCallback(
(newSelectedDataKey: string | null) => {
setSelectedDataKey(newSelectedDataKey)
if (isClickable && onSelectionChange) {
onSelectionChange(newSelectedDataKey)
}
},
[onSelectionChange, isClickable]
)
const isStacked = stackType === "stacked" || stackType === "percent"
const isHorizontal = layout === "horizontal"
return (
<ChartContainer
className={className}
config={chartConfig}
footer={
showBrush &&
!isLoading && (
<EvilBrush
data={data}
chartConfig={chartConfig}
xDataKey={xDataKey}
variant="bar"
barRadius={barRadius}
height={brushHeight}
formatLabel={brushFormatLabel}
stacked={isStacked}
skipStyle
className="mt-1"
{...brushProps}
onChange={(range) => {
brushProps.onChange(range)
onBrushChange?.(range)
}}
/>
)
}
>
<LoadingIndicator isLoading={isLoading} />
<BarChart
id="evil-charts-bar-chart"
accessibilityLayer
layout={isHorizontal ? "vertical" : "horizontal"}
data={isLoading ? loadingData : displayData}
barGap={barGap}
barCategoryGap={barCategoryGap}
stackOffset={stackType === "percent" ? "expand" : undefined}
onMouseEnter={() => setIsMouseInChart(true)}
onMouseLeave={() => setIsMouseInChart(false)}
{...chartProps}
>
{backgroundVariant && <ChartBackground variant={backgroundVariant} />}
<ReferenceLine color="white" />
{!hideCartesianGrid && !backgroundVariant && (
<CartesianGrid
vertical={isHorizontal}
horizontal={!isHorizontal}
strokeDasharray="3 3"
/>
)}
{!hideLegend && (
<ChartLegend
verticalAlign="top"
align="right"
content={
<ChartLegendContent
selected={selectedDataKey}
onSelectChange={handleSelectionChange}
isClickable={isClickable}
variant={legendVariant}
/>
}
/>
)}
{xDataKey && !isLoading && (
<XAxis
dataKey={isHorizontal ? undefined : xDataKey}
type={isHorizontal ? "number" : "category"}
tickLine={false}
axisLine={false}
tickMargin={8}
minTickGap={tickGap}
{...xAxisProps}
/>
)}
{(isHorizontal ? xDataKey : yDataKey) && !isLoading && (
<YAxis
dataKey={isHorizontal ? xDataKey : yDataKey}
type={isHorizontal ? "category" : "number"}
tickLine={false}
axisLine={false}
tickMargin={8}
minTickGap={tickGap}
width="auto"
{...yAxisProps}
/>
)}
{!hideTooltip && !isLoading && (
<ChartTooltip
cursor={false}
defaultIndex={tooltipDefaultIndex}
content={
<ChartTooltipContent
selected={selectedDataKey}
roundness={tooltipRoundness}
variant={tooltipVariant}
/>
}
/>
)}
{!isLoading &&
Object.keys(chartConfig).map((dataKey) => {
const isGlowing = glowingBars.includes(
dataKey as NumericDataKeys<TData>
)
const filter = isGlowing
? `url(#${chartId}-bar-glow-${dataKey})`
: undefined
// Shared props for both shape and activeBar
const customBarProps = {
chartId,
dataKey,
barVariant,
barRadius,
filter,
isClickable,
enableHoverHighlight,
isMouseInChart,
selectedDataKey,
enableBufferBar,
dataLength: displayData.length,
onClick: () => {
if (!isClickable) return
handleSelectionChange(
selectedDataKey === dataKey ? null : dataKey
)
},
}
return (
<Bar
key={dataKey}
dataKey={dataKey}
stackId={isStacked ? "evil-stacked" : undefined}
fill={`url(#${chartId}-colors-${dataKey})`}
radius={barRadius}
style={
isClickable || enableHoverHighlight
? { cursor: "pointer" }
: undefined
}
shape={(props: unknown) => (
<CustomBar
{...(props as BarShapeProps)}
{...customBarProps}
/>
)}
activeBar={(props: unknown) => (
<CustomBar
{...(props as BarShapeProps)}
{...customBarProps}
/>
)}
>
{showLabels && (
<LabelList
dataKey={dataKey}
position="top"
className="fill-muted-foreground text-[10px]"
{...labelListProps}
/>
)}
</Bar>
)
})}
{/* ======== LOADING BAR ======== */}
{isLoading && (
<Bar
dataKey={LOADING_BAR_DATA_KEY}
fill="currentColor"
fillOpacity={0.15}
radius={barRadius}
isAnimationActive={false}
legendType="none"
style={{ mask: `url(#${chartId}-loading-mask)` }}
/>
)}
{/* ======== CHART STYLES ======== */}
<defs>
{isLoading && (
<LoadingBarPatternStyle
chartId={chartId}
onShimmerExit={onShimmerExit}
/>
)}
{/* Shared vertical color gradient - always rendered for fill */}
<VerticalColorGradientStyle
chartConfig={chartConfig}
chartId={chartId}
/>
{/* Variant-specific styles */}
{barVariant === "hatched" && (
<HatchedPatternStyle chartConfig={chartConfig} chartId={chartId} />
)}
{barVariant === "duotone" && (
<DuotonePatternStyle chartConfig={chartConfig} chartId={chartId} />
)}
{barVariant === "duotone-reverse" && (
<DuotoneReversePatternStyle
chartConfig={chartConfig}
chartId={chartId}
/>
)}
{barVariant === "gradient" && (
<GradientPatternStyle chartConfig={chartConfig} chartId={chartId} />
)}
{barVariant === "stripped" && (
<StrippedPatternStyle chartConfig={chartConfig} chartId={chartId} />
)}
{/* Buffer bar hatched pattern - always rendered when enableBufferBar */}
{enableBufferBar && (
<BufferHatchedPatternStyle
chartConfig={chartConfig}
chartId={chartId}
/>
)}
{/* Glow filter for glowing bars */}
{glowingBars.length > 0 && (
<GlowFilterStyle
chartId={chartId}
glowingBars={glowingBars as string[]}
/>
)}
</defs>
</BarChart>
</ChartContainer>
)
}
// Types for custom bar shape
type BarShapeProps = {
x?: number
y?: number
width?: number
height?: number
fill?: string
fillOpacity?: number
dataKey?: string
index?: number
[key: string]: unknown
}
type CustomBarProps = {
chartId: string
dataKey: string
barVariant: BarVariant
barRadius: number
filter?: string
isClickable?: boolean
enableHoverHighlight?: boolean
isMouseInChart?: boolean
selectedDataKey?: string | null
isActive?: boolean
enableBufferBar?: boolean
dataLength?: number
onClick?: () => void
} & BarShapeProps
// Custom bar shape component for different variants
const CustomBar = (props: CustomBarProps) => {
const {
x = 0,
y = 0,
width = 0,
height = 0,
chartId,
dataKey,
barVariant,
barRadius,
filter,
isClickable,
enableHoverHighlight,
isMouseInChart,
selectedDataKey,
isActive,
enableBufferBar,
dataLength = 0,
onClick,
} = props
const index = typeof props.index === "number" ? props.index : -1
const isLastBar =
enableBufferBar && dataLength > 0 && index === dataLength - 1
const isStripped = barVariant === "stripped"
const getFill = () => {
// Buffer bar: last bar always uses hatched pattern
if (isLastBar) {
return `url(#${chartId}-buffer-hatched-${dataKey})`
}
switch (barVariant) {
case "hatched":
return `url(#${chartId}-hatched-${dataKey})`
case "duotone":
return `url(#${chartId}-duotone-${dataKey})`
case "duotone-reverse":
return `url(#${chartId}-duotone-reverse-${dataKey})`
case "gradient":
return `url(#${chartId}-gradient-${dataKey})`
case "stripped":
return `url(#${chartId}-stripped-${dataKey})`
default:
return `url(#${chartId}-colors-${dataKey})`
}
}
const fillOpacity = getBarOpacity({
isClickable,
selectedDataKey,
dataKey,
enableHoverHighlight,
isMouseInChart,
isActive,
})
const cursorStyle =
isClickable || enableHoverHighlight ? { cursor: "pointer" } : undefined
// For stripped: top corners rounded, bottom flat [topLeft, topRight, bottomRight, bottomLeft]
// For others: all corners rounded
const radius: RectRadius = isStripped
? [barRadius, barRadius, 0, 0]
: barRadius
return (
<g style={cursorStyle} onClick={onClick}>
{/* Transparent rectangle for full column hit area */}
<Rectangle {...props} fill="transparent" />
{/* Visible bar with animated opacity */}
<Rectangle
x={x}
y={y}
width={width}
opacity={fillOpacity}
height={Math.max(0, height - 3)}
radius={radius}
fill={getFill()}
filter={filter}
stroke={isLastBar ? `url(#${chartId}-colors-${dataKey})` : undefined}
strokeWidth={isLastBar ? 1 : undefined}
/>
{/* Top border strip for stripped variant */}
{isStripped && (
<Rectangle
x={x}
y={y - 4}
width={width}
height={2}
radius={1}
fill={`url(#${chartId}-colors-${dataKey})`}
/>
)}
</g>
)
}
// Shared vertical color gradient (top to bottom) - used for bar fill
const VerticalColorGradientStyle = ({
chartConfig,
chartId,
}: {
chartConfig: ChartConfig
chartId: string
}) => {
return (
<>
{Object.entries(chartConfig).map(([dataKey, config]) => {
const colorsCount = getColorsCount(config)
return (
<linearGradient
key={`${chartId}-colors-${dataKey}`}
id={`${chartId}-colors-${dataKey}`}
x1="0"
y1="0"
x2="0"
y2="1"
>
{colorsCount === 1 ? (
<>
<stop offset="0%" stopColor={`var(--color-${dataKey}-0)`} />
<stop offset="100%" stopColor={`var(--color-${dataKey}-0)`} />
</>
) : (
Array.from({ length: colorsCount }, (_, index) => (
<stop
key={index}
offset={`${(index / (colorsCount - 1)) * 100}%`}
stopColor={`var(--color-${dataKey}-${index}, var(--color-${dataKey}-0))`}
/>
))
)}
</linearGradient>
)
})}
</>
)
}
// Hatched pattern style for bars - uses mask to preserve gradient colors
const HatchedPatternStyle = ({
chartConfig,
chartId,
}: {
chartConfig: ChartConfig
chartId: string
}) => {
return (
<>
{/* Shared hatched stripes mask pattern */}
<pattern
id={`${chartId}-hatched-mask-pattern`}
x="0"
y="0"
width="5"
height="5"
patternUnits="userSpaceOnUse"
patternTransform="rotate(-45)"
>
<rect width="5" height="5" fill="white" fillOpacity={0.3} />
<rect width="1.5" height="5" fill="white" fillOpacity={1} />
</pattern>
{Object.keys(chartConfig).map((dataKey) => (
<g key={`${chartId}-hatched-group-${dataKey}`}>
{/* Mask using hatched stripes */}
<mask id={`${chartId}-hatched-mask-${dataKey}`}>
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-hatched-mask-pattern)`}
/>
</mask>
{/* Pattern: gradient fill masked by hatched stripes */}
<pattern
id={`${chartId}-hatched-${dataKey}`}
patternUnits="userSpaceOnUse"
width="100%"
height="100%"
>
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-colors-${dataKey})`}
mask={`url(#${chartId}-hatched-mask-${dataKey})`}
/>
</pattern>
</g>
))}
</>
)
}
// Buffer hatched pattern style - diagonal lines only (no background fill), used for the last bar when enableBufferBar is true
const BufferHatchedPatternStyle = ({
chartConfig,
chartId,
}: {
chartConfig: ChartConfig
chartId: string
}) => {
return (
<>
{/* Shared buffer hatched stripes mask pattern - lines only, no background */}
<pattern
id={`${chartId}-buffer-hatched-mask-pattern`}
x="0"
y="0"
width="5"
height="5"
patternUnits="userSpaceOnUse"
patternTransform="rotate(-45)"
>
<rect width="5" height="5" fill="black" fillOpacity={0} />
<rect width="1" height="5" fill="white" fillOpacity={1} />
</pattern>
{Object.keys(chartConfig).map((dataKey) => (
<g key={`${chartId}-buffer-hatched-group-${dataKey}`}>
{/* Mask using buffer hatched stripes */}
<mask id={`${chartId}-buffer-hatched-mask-${dataKey}`}>
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-buffer-hatched-mask-pattern)`}
/>
</mask>
{/* Pattern: gradient fill masked by buffer hatched stripes - lines only */}
<pattern
id={`${chartId}-buffer-hatched-${dataKey}`}
patternUnits="userSpaceOnUse"
width="100%"
height="100%"
>
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-colors-${dataKey})`}
mask={`url(#${chartId}-buffer-hatched-mask-${dataKey})`}
/>
</pattern>
</g>
))}
</>
)
}
// Duotone pattern style for bars (half opacity, half full) - uses objectBoundingBox for per-bar effect
const DuotonePatternStyle = ({
chartConfig,
chartId,
}: {
chartConfig: ChartConfig
chartId: string
}) => {
return (
<>
{Object.entries(chartConfig).map(([dataKey, config]) => {
const colorsCount = getColorsCount(config)
return (
<g key={`${chartId}-duotone-group-${dataKey}`}>
{/* Duotone mask gradient - applies to each bar's bounding box */}
<linearGradient
id={`${chartId}-duotone-mask-gradient-${dataKey}`}
gradientUnits="objectBoundingBox"
x1="0"
y1="0"
x2="1"
y2="0"
>
<stop offset="50%" stopColor="white" stopOpacity={0.4} />
<stop offset="50%" stopColor="white" stopOpacity={1} />
</linearGradient>
{/* Color gradient for this dataKey - applies to each bar's bounding box */}
<linearGradient
id={`${chartId}-duotone-colors-${dataKey}`}
gradientUnits="objectBoundingBox"
x1="0"
y1="0"
x2="0"
y2="1"
>
{colorsCount === 1 ? (
<>
<stop offset="0%" stopColor={`var(--color-${dataKey}-0)`} />
<stop offset="100%" stopColor={`var(--color-${dataKey}-0)`} />
</>
) : (
Array.from({ length: colorsCount }, (_, index) => (
<stop
key={index}
offset={`${(index / (colorsCount - 1)) * 100}%`}
stopColor={`var(--color-${dataKey}-${index}, var(--color-${dataKey}-0))`}
/>
))
)}
</linearGradient>
{/* Mask for duotone effect */}
<mask
id={`${chartId}-duotone-mask-${dataKey}`}
maskContentUnits="objectBoundingBox"
>
<rect
x="0"
y="0"
width="1"
height="1"
fill={`url(#${chartId}-duotone-mask-gradient-${dataKey})`}
/>
</mask>
{/* Pattern: gradient fill with duotone mask */}
<pattern
id={`${chartId}-duotone-${dataKey}`}
patternUnits="objectBoundingBox"
patternContentUnits="objectBoundingBox"
width="1"
height="1"
>
<rect
x="0"
y="0"
width="1"
height="1"
fill={`url(#${chartId}-duotone-colors-${dataKey})`}
mask={`url(#${chartId}-duotone-mask-${dataKey})`}
/>
</pattern>
</g>
)
})}
</>
)
}
// Duotone reverse pattern style for bars (full opacity first, then half) - uses objectBoundingBox for per-bar effect
const DuotoneReversePatternStyle = ({
chartConfig,
chartId,
}: {
chartConfig: ChartConfig
chartId: string
}) => {
return (
<>
{Object.entries(chartConfig).map(([dataKey, config]) => {
const colorsCount = getColorsCount(config)
return (
<g key={`${chartId}-duotone-reverse-group-${dataKey}`}>
{/* Duotone reverse mask gradient - applies to each bar's bounding box */}
<linearGradient
id={`${chartId}-duotone-reverse-mask-gradient-${dataKey}`}
gradientUnits="objectBoundingBox"
x1="0"
y1="0"
x2="1"
y2="0"
>
<stop offset="50%" stopColor="white" stopOpacity={1} />
<stop offset="50%" stopColor="white" stopOpacity={0.4} />
</linearGradient>
{/* Color gradient for this dataKey - applies to each bar's bounding box */}
<linearGradient
id={`${chartId}-duotone-reverse-colors-${dataKey}`}
gradientUnits="objectBoundingBox"
x1="0"
y1="0"
x2="0"
y2="1"
>
{colorsCount === 1 ? (
<>
<stop offset="0%" stopColor={`var(--color-${dataKey}-0)`} />
<stop offset="100%" stopColor={`var(--color-${dataKey}-0)`} />
</>
) : (
Array.from({ length: colorsCount }, (_, index) => (
<stop
key={index}
offset={`${(index / (colorsCount - 1)) * 100}%`}
stopColor={`var(--color-${dataKey}-${index}, var(--color-${dataKey}-0))`}
/>
))
)}
</linearGradient>
{/* Mask for duotone reverse effect */}
<mask
id={`${chartId}-duotone-reverse-mask-${dataKey}`}
maskContentUnits="objectBoundingBox"
>
<rect
x="0"
y="0"
width="1"
height="1"
fill={`url(#${chartId}-duotone-reverse-mask-gradient-${dataKey})`}
/>
</mask>
{/* Pattern: gradient fill with duotone reverse mask */}
<pattern
id={`${chartId}-duotone-reverse-${dataKey}`}
patternUnits="objectBoundingBox"
patternContentUnits="objectBoundingBox"
width="1"
height="1"
>
<rect
x="0"
y="0"
width="1"
height="1"
fill={`url(#${chartId}-duotone-reverse-colors-${dataKey})`}
mask={`url(#${chartId}-duotone-reverse-mask-${dataKey})`}
/>
</pattern>
</g>
)
})}
</>
)
}
// Gradient pattern style for bars (top to bottom fade) - uses mask to preserve gradient colors
const GradientPatternStyle = ({
chartConfig,
chartId,
}: {
chartConfig: ChartConfig
chartId: string
}) => {
return (
<>
{/* Shared vertical fade gradient for mask */}
<linearGradient
id={`${chartId}-gradient-mask-gradient`}
x1="0"
y1="0"
x2="0"
y2="1"
>
<stop offset="20%" stopColor="white" stopOpacity={1} />
<stop offset="90%" stopColor="white" stopOpacity={0} />
</linearGradient>
{Object.keys(chartConfig).map((dataKey) => (
<g key={`${chartId}-gradient-group-${dataKey}`}>
{/* Mask for vertical fade */}
<mask id={`${chartId}-gradient-mask-${dataKey}`}>
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-gradient-mask-gradient)`}
/>
</mask>
{/* Pattern: gradient fill with vertical fade mask */}
<pattern
id={`${chartId}-gradient-${dataKey}`}
patternUnits="userSpaceOnUse"
width="100%"
height="100%"
>
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-colors-${dataKey})`}
mask={`url(#${chartId}-gradient-mask-${dataKey})`}
/>
</pattern>
</g>
))}
</>
)
}
// Stripped pattern style for bars (low opacity body with full opacity top) - uses mask to preserve gradient colors
const StrippedPatternStyle = ({
chartConfig,
chartId,
}: {
chartConfig: ChartConfig
chartId: string
}) => {
return (
<>
{/* Shared stripped fade gradient for mask */}
<linearGradient
id={`${chartId}-stripped-mask-gradient`}
x1="0"
y1="0"
x2="0"
y2="1"
>
<stop offset="0%" stopColor="white" stopOpacity={0.2} />
<stop offset="100%" stopColor="white" stopOpacity={0.2} />
</linearGradient>
{Object.keys(chartConfig).map((dataKey) => (
<g key={`${chartId}-stripped-group-${dataKey}`}>
{/* Mask for stripped fade */}
<mask id={`${chartId}-stripped-mask-${dataKey}`}>
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-stripped-mask-gradient)`}
/>
</mask>
{/* Pattern: gradient fill with stripped fade mask */}
<pattern
id={`${chartId}-stripped-${dataKey}`}
patternUnits="userSpaceOnUse"
width="100%"
height="100%"
>
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-colors-${dataKey})`}
mask={`url(#${chartId}-stripped-mask-${dataKey})`}
/>
</pattern>
</g>
))}
</>
)
}
// Glow filter style for glowing bars
const GlowFilterStyle = ({
chartId,
glowingBars,
}: {
chartId: string
glowingBars: string[]
}) => {
return (
<>
{glowingBars.map((dataKey) => (
<filter
key={`${chartId}-bar-glow-${dataKey}`}
id={`${chartId}-bar-glow-${dataKey}`}
x="-100%"
y="-100%"
width="300%"
height="300%"
>
<feGaussianBlur in="SourceGraphic" stdDeviation="8" result="blur" />
<feColorMatrix
in="blur"
type="matrix"
values="1 0 0 0 0
0 1 0 0 0
0 0 1 0 0
0 0 0 0.5 0"
result="glow"
/>
<feMerge>
<feMergeNode in="glow" />
<feMergeNode in="SourceGraphic" />
</feMerge>
</filter>
))}
</>
)
}
// Generate gradient stops with smooth easing for loading animation
const generateEasedGradientStops = (
steps: number = 17,
minOpacity: number = 0.05,
maxOpacity: number = 0.9
) => {
return Array.from({ length: steps }, (_, i) => {
const t = i / (steps - 1)
const eased = Math.sin(t * Math.PI) ** 2
const opacity = minOpacity + eased * (maxOpacity - minOpacity)
return {
offset: `${(t * 100).toFixed(0)}%`,
opacity: Number(opacity.toFixed(3)),
}
})
}
/**
* Hook to manage loading data with pixel-perfect shimmer synchronization.
*/
export function useLoadingData(isLoading: boolean, loadingBars: number = 12) {
const [loadingDataKey, setLoadingDataKey] = useState(false)
const onShimmerExit = useCallback(() => {
if (isLoading) {
setLoadingDataKey((prev) => !prev)
}
}, [isLoading])
const loadingData = useMemo(
() => getLoadingData(loadingBars, 20, 80),
// eslint-disable-next-line react-hooks/exhaustive-deps
[loadingBars, loadingDataKey]
)
return { loadingData, onShimmerExit }
}
/**
* Loading bar pattern with animated skeleton effect
*/
const LoadingBarPatternStyle = ({
chartId,
onShimmerExit,
}: {
chartId: string
onShimmerExit: () => void
}) => {
const gradientStops = generateEasedGradientStops()
const patternWidth = 3
const startX = -1
const endX = 2
const lastXRef = useRef(startX)
return (
<>
<linearGradient
id={`${chartId}-loading-mask-gradient`}
x1="0"
y1="0"
x2="1"
y2="0"
>
{gradientStops.map(({ offset, opacity }) => (
<stop
key={offset}
offset={offset}
stopColor="white"
stopOpacity={opacity}
/>
))}
</linearGradient>
<pattern
id={`${chartId}-loading-mask-pattern`}
patternUnits="objectBoundingBox"
patternContentUnits="objectBoundingBox"
patternTransform="rotate(25)"
width={patternWidth}
height="1"
x="0"
y="0"
>
<motion.rect
y="0"
width="1"
height="1"
fill={`url(#${chartId}-loading-mask-gradient)`}
initial={{ x: startX }}
animate={{ x: endX }}
transition={{
duration: LOADING_ANIMATION_DURATION / 1000,
ease: "linear",
repeat: Infinity,
repeatType: "loop",
}}
onUpdate={(latest) => {
const xValue = typeof latest.x === "number" ? latest.x : startX
const lastX = lastXRef.current
if (xValue >= 1 && lastX < 1) {
onShimmerExit()
}
lastXRef.current = xValue
}}
/>
</pattern>
<mask id={`${chartId}-loading-mask`} maskUnits="userSpaceOnUse">
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-loading-mask-pattern)`}
/>
</mask>
</>
)
}
/**
* Calculate bar opacity based on click selection and hover highlight state
*/
const getBarOpacity = ({
isClickable,
selectedDataKey,
dataKey,
enableHoverHighlight,
isMouseInChart,
isActive,
}: {
isClickable?: boolean
selectedDataKey?: string | null
dataKey: string
enableHoverHighlight?: boolean
isMouseInChart?: boolean
isActive?: boolean
}) => {
// Check if this dataKey is selected (for click selection)
const isSelectedDataKey =
selectedDataKey === null || selectedDataKey === dataKey
// Base opacity from click selection
const clickOpacity =
isClickable && selectedDataKey !== null ? (isSelectedDataKey ? 1 : 0.3) : 1
// If hover highlight is enabled and mouse is in chart
if (enableHoverHighlight && isMouseInChart) {
// Combine: if this bar is active/hovered, show full opacity (respecting click selection)
// If not hovered, dim it further
return isActive ? clickOpacity : clickOpacity * 0.3
}
return clickOpacity
}
src/components/evilcharts/ui/chart.tsx
"use client";
import * as RechartsPrimitive from "recharts";
import { cn } from "@/lib/utils";
import * as React from "react";
// Format: { THEME_NAME: CSS_SELECTOR }
const THEMES = { light: "", dark: ".dark" } as const;
type ThemeKey = keyof typeof THEMES;
// All Keys are optional at first
type ThemeColorsBase = {
[K in ThemeKey]?: string[];
};
// Require at least one theme key
type AtLeastOneThemeColor = {
[K in ThemeKey]: Required<Pick<ThemeColorsBase, K>> & Partial<Omit<ThemeColorsBase, K>>;
}[ThemeKey];
const VALID_THEME_KEYS = Object.keys(THEMES) as ThemeKey[];
// Validation for chart config colors at runtime
function validateChartConfigColors(config: ChartConfig): void {
for (const [key, value] of Object.entries(config)) {
if (value.colors) {
const hasValidThemeKey = VALID_THEME_KEYS.some(
(themeKey) => value.colors?.[themeKey] !== undefined,
);
if (!hasValidThemeKey) {
throw new Error(
`[EvilCharts] Invalid chart config for "${key}": colors object must have at least one theme key (${VALID_THEME_KEYS.join(", ")}). Received empty object or invalid keys.`,
);
}
}
}
}
export type ChartConfig = Record<
string,
{
label?: React.ReactNode;
icon?: React.ComponentType;
colors?: AtLeastOneThemeColor;
}
>;
interface ChartContextProps {
config: ChartConfig;
}
const ChartContext = React.createContext<ChartContextProps | null>(null);
export function useChart() {
const context = React.useContext(ChartContext);
if (!context) {
throw new Error("useChart must be used within a <ChartContainer />");
}
return context;
}
interface ChartContainerProps
extends
Omit<React.ComponentProps<"div">, "children">,
Pick<
React.ComponentProps<typeof RechartsPrimitive.ResponsiveContainer>,
| "initialDimension"
| "aspect"
| "debounce"
| "minHeight"
| "minWidth"
| "maxHeight"
| "height"
| "width"
| "onResize"
| "children"
> {
config: ChartConfig;
innerResponsiveContainerStyle?: React.ComponentProps<
typeof RechartsPrimitive.ResponsiveContainer
>["style"];
/** Optional content rendered below the chart (e.g. EvilBrush) */
footer?: React.ReactNode;
}
function ChartContainer({
id,
config,
initialDimension = { width: 320, height: 200 },
className,
children,
footer,
...props
}: Readonly<ChartContainerProps>) {
const uniqueId = React.useId();
const chartId = `chart-${id ?? uniqueId.replace(/:/g, "")}`;
// Validate chart config at runtime
validateChartConfigColors(config);
return (
<ChartContext.Provider value={{ config }}>
<div
data-slot="chart"
data-chart={chartId}
className={cn(
"min-h-0 w-full flex-1",
"[&_.recharts-cartesian-axis-tick_text]:fill-muted-foreground [&_.recharts-cartesian-grid_line[stroke='#ccc']]:stroke-border/50 [&_.recharts-curve.recharts-tooltip-cursor]:stroke-border [&_.recharts-polar-grid_[stroke='#ccc']]:stroke-border [&_.recharts-radial-bar-background-sector]:fill-muted [&_.recharts-rectangle.recharts-tooltip-cursor]:fill-muted [&_.recharts-reference-line_[stroke='#ccc']]:stroke-border relative flex flex-col justify-center text-xs [&_.recharts-dot[stroke='#fff']]:stroke-transparent [&_.recharts-layer]:outline-hidden [&_.recharts-sector]:outline-hidden [&_.recharts-sector[stroke='#fff']]:stroke-transparent [&_.recharts-surface]:outline-hidden",
!footer && "aspect-video",
className,
)}
{...props}
>
<ChartStyle id={chartId} config={config} />
<RechartsPrimitive.ResponsiveContainer
className="min-h-0 w-full flex-1"
initialDimension={initialDimension}
>
{children}
</RechartsPrimitive.ResponsiveContainer>
{footer}
</div>
</ChartContext.Provider>
);
}
function LoadingIndicator({ isLoading }: { isLoading: boolean }) {
if (!isLoading) {
return null;
}
return (
<div className="pointer-events-none absolute inset-0 z-20 flex items-center justify-center">
<div className="text-primary bg-background flex items-center justify-center gap-2 rounded-md border px-2 py-0.5 text-sm">
<div className="border-border border-t-primary h-3 w-3 animate-spin rounded-full border" />
<span>Loading</span>
</div>
</div>
);
}
// Distribute colors evenly across slots, extra slots go to last color(s)
// Example: 2 colors for 4 slots → [red, red, pink, pink]
// Example: 3 colors for 4 slots → [red, pink, blue, blue]
function distributeColors(colorsArray: string[], maxCount: number): string[] {
const availableCount = colorsArray.length;
if (availableCount >= maxCount) {
return colorsArray.slice(0, maxCount);
}
const result: string[] = [];
const baseSlots = Math.floor(maxCount / availableCount);
const extraSlots = maxCount % availableCount;
// First (availableCount - extraSlots) colors get baseSlots each
// Last extraSlots colors get (baseSlots + 1) each
for (let colorIdx = 0; colorIdx < availableCount; colorIdx++) {
const isExtraColor = colorIdx >= availableCount - extraSlots;
const slotsForThisColor = baseSlots + (isExtraColor ? 1 : 0);
for (let j = 0; j < slotsForThisColor; j++) {
result.push(colorsArray[colorIdx]);
}
}
return result;
}
const ChartStyle = ({ id, config }: { id: string; config: ChartConfig }) => {
const colorConfig = Object.entries(config).filter(([, config]) => config.colors);
if (!colorConfig.length) {
return null;
}
const generateCssVars = (theme: keyof typeof THEMES) =>
colorConfig
.flatMap(([key, itemConfig]) => {
const colorsArray = itemConfig.colors?.[theme];
if (!colorsArray || !Array.isArray(colorsArray) || colorsArray.length === 0) {
return [];
}
// Get max count across all themes for this key
const maxCount = getColorsCount(itemConfig);
// Distribute colors evenly across all required slots
const distributedColors = distributeColors(colorsArray, maxCount);
return distributedColors.map((color, index) => ` --color-${key}-${index}: ${color};`);
})
.filter(Boolean)
.join("\n");
const css = Object.entries(THEMES)
.map(
([theme, prefix]) =>
`${prefix} [data-chart=${id}] {\n${generateCssVars(theme as keyof typeof THEMES)}\n}`,
)
.join("\n");
return <style dangerouslySetInnerHTML={{ __html: css }} />;
};
// Helper to extract item config from a payload.
export function getPayloadConfigFromPayload(config: ChartConfig, payload: unknown, key: string) {
if (typeof payload !== "object" || payload === null) {
return undefined;
}
const payloadPayload =
"payload" in payload && typeof payload.payload === "object" && payload.payload !== null
? payload.payload
: undefined;
let configLabelKey: string = key;
if (key in payload && typeof payload[key as keyof typeof payload] === "string") {
configLabelKey = payload[key as keyof typeof payload] as string;
} else if (
payloadPayload &&
key in payloadPayload &&
typeof payloadPayload[key as keyof typeof payloadPayload] === "string"
) {
configLabelKey = payloadPayload[key as keyof typeof payloadPayload] as string;
}
return configLabelKey in config ? config[configLabelKey] : config[key];
}
// Format values to percent for expanded charts
function axisValueToPercentFormatter(value: number) {
return `${Math.round(value * 100).toFixed(0)}%`;
}
// Get max colors count across all themes for a config entry
function getColorsCount(config: ChartConfig[string]): number {
if (!config.colors) return 1;
const counts = VALID_THEME_KEYS.map((theme) => config.colors?.[theme]?.length ?? 0);
return Math.max(...counts, 1);
}
// Generate random loading data for skeleton/loading state
// min/max represent percentage of the range (0-100), defaults to 20-80 for realistic look
export const getLoadingData = (points: number = 10, min: number = 0, max: number = 70) => {
const range = max - min;
return Array.from({ length: points }, () => ({
loading: Math.floor(Math.random() * range) + min,
}));
};
export {
ChartContainer,
ChartStyle,
axisValueToPercentFormatter,
LoadingIndicator,
getColorsCount,
};
src/components/evilcharts/ui/tooltip.tsx
import { getPayloadConfigFromPayload, getColorsCount, useChart } from "@/components/evilcharts/ui/chart";
import type { NameType, ValueType } from "recharts/types/component/DefaultTooltipContent";
import * as RechartsPrimitive from "recharts";
import { cn } from "@/lib/utils";
import * as React from "react";
type TooltipRoundness = "sm" | "md" | "lg" | "xl";
type TooltipVariant = "default" | "frosted-glass";
const roundnessMap: Record<TooltipRoundness, string> = {
sm: "rounded-sm",
md: "rounded-md",
lg: "rounded-lg",
xl: "rounded-xl",
};
const variantMap: Record<TooltipVariant, string> = {
default: "bg-background",
"frosted-glass": "bg-background/70 backdrop-blur-sm",
};
function ChartTooltipContent({
active,
payload,
className,
indicator = "dot",
hideLabel = false,
hideIndicator = false,
label,
labelFormatter,
labelClassName,
formatter,
nameKey,
labelKey,
selected,
roundness = "lg",
variant = "default",
}: React.ComponentProps<typeof RechartsPrimitive.Tooltip> &
React.ComponentProps<"div"> & {
hideLabel?: boolean;
hideIndicator?: boolean;
indicator?: "line" | "dot" | "dashed";
nameKey?: string;
labelKey?: string;
selected?: string | null;
roundness?: TooltipRoundness;
variant?: TooltipVariant;
} & Omit<
RechartsPrimitive.DefaultTooltipContentProps<ValueType, NameType>,
"accessibilityLayer"
>) {
const { config } = useChart();
const tooltipLabel = React.useMemo(() => {
if (hideLabel || !payload?.length) {
return null;
}
const [item] = payload;
const key = `${labelKey ?? item?.dataKey ?? item?.name ?? "value"}`;
const itemConfig = getPayloadConfigFromPayload(config, item, key);
const value =
!labelKey && typeof label === "string" ? (config[label]?.label ?? label) : itemConfig?.label;
if (labelFormatter) {
return (
<div className={cn("font-medium", labelClassName)}>{labelFormatter(value, payload)}</div>
);
}
if (!value) {
return null;
}
return <div className={cn("font-medium", labelClassName)}>{value}</div>;
}, [label, labelFormatter, payload, hideLabel, labelClassName, config, labelKey]);
if (!active || !payload?.length) {
// Empty tooltip - to prevent position getting 0.0 so it doesnt animate tooltip every time from 0.0 origin
return <span className="p-4" />;
}
const nestLabel = payload.length === 1 && indicator !== "dot";
return (
<div
className={cn(
"border-border/50 grid min-w-32 items-start gap-1.5 border px-2.5 py-1.5 text-xs shadow-xl",
roundnessMap[roundness],
variantMap[variant],
className,
)}
>
{!nestLabel ? tooltipLabel : null}
<div className="grid gap-1.5">
{payload
.filter((item) => item.type !== "none")
.map((item, index) => {
// For pie charts, item.name contains the sector name (e.g., "chrome")
// For radial charts, the name is in item.payload[nameKey]
// For other charts, item.name or item.dataKey contains the series name
const payloadName =
nameKey && item.payload
? (item.payload as Record<string, unknown>)[nameKey]
: undefined;
const key = `${payloadName ?? item.name ?? item.dataKey ?? "value"}`;
const itemConfig = getPayloadConfigFromPayload(config, item, key);
// Get colors count for this item to determine gradient vs solid
const colorsCount = itemConfig ? getColorsCount(itemConfig) : 1;
return (
<div
key={index}
className={cn(
"[&>svg]:text-muted-foreground flex w-full flex-wrap items-stretch gap-2 [&>svg]:h-2.5 [&>svg]:w-2.5",
indicator === "dot" && "items-center",
selected != null && selected !== item.dataKey && "opacity-30",
)}
>
{formatter && item?.value !== undefined && item.name ? (
formatter(item.value, item.name, item, index, item.payload)
) : (
<>
{itemConfig?.icon ? (
<itemConfig.icon />
) : (
!hideIndicator && (
<div
className={cn("shrink-0 rounded-[2px]", {
"h-2.5 w-2.5": indicator === "dot",
"w-1": indicator === "line",
"w-0 border-[1.5px] border-dashed bg-transparent!":
indicator === "dashed",
"my-0.5": nestLabel && indicator === "dashed",
})}
style={getIndicatorColorStyle(key, colorsCount)}
/>
)
)}
<div
className={cn(
"flex flex-1 justify-between gap-4 leading-none",
nestLabel ? "items-end" : "items-center",
)}
>
<div className="grid gap-1.5">
{nestLabel ? tooltipLabel : null}
<span className="text-muted-foreground">
{itemConfig?.label ?? item.name}
</span>
</div>
{item.value != null && (
<span className="text-foreground font-mono font-medium tabular-nums">
{typeof item.value === "number"
? item.value.toLocaleString()
: String(item.value)}
</span>
)}
</div>
</>
)}
</div>
);
})}
</div>
</div>
);
}
function getIndicatorColorStyle(dataKey: string, colorsCount: number): React.CSSProperties {
if (colorsCount <= 1) {
return { background: `var(--color-${dataKey}-0)` };
}
// Multiple colors: create linear gradient with evenly distributed stops
const stops = Array.from({ length: colorsCount }, (_, index) => {
const offset = (index / (colorsCount - 1)) * 100;
return `var(--color-${dataKey}-${index}) ${offset}%`;
}).join(", ");
return { background: `linear-gradient(to right, ${stops})` };
}
const ChartTooltip = ({
animationDuration = 200,
...props
}: React.ComponentProps<typeof RechartsPrimitive.Tooltip>) => (
<RechartsPrimitive.Tooltip animationDuration={animationDuration} {...props} />
);
export { ChartTooltip, ChartTooltipContent };
export type { TooltipRoundness, TooltipVariant };
src/components/evilcharts/ui/legend.tsx
import { getPayloadConfigFromPayload, getColorsCount, useChart } from "@/components/evilcharts/ui/chart";
import * as RechartsPrimitive from "recharts";
import { cn } from "@/lib/utils";
import * as React from "react";
type ChartLegendVariant =
| "square"
| "circle"
| "circle-outline"
| "rounded-square"
| "rounded-square-outline"
| "vertical-bar"
| "horizontal-bar";
function ChartLegendContent({
className,
hideIcon = false,
nameKey,
payload,
verticalAlign,
align = "right",
selected,
onSelectChange,
isClickable,
variant = "rounded-square",
}: React.ComponentProps<"div"> & {
hideIcon?: boolean;
nameKey?: string;
selected?: string | null;
isClickable?: boolean;
onSelectChange?: (selected: string | null) => void;
variant?: ChartLegendVariant;
} & RechartsPrimitive.DefaultLegendContentProps) {
const { config } = useChart();
if (!payload?.length) {
return null;
}
return (
<div
className={cn(
"flex items-center gap-4 select-none",
align === "left" && "justify-start",
align === "center" && "justify-center",
align === "right" && "justify-end",
verticalAlign === "top" ? "pb-4" : "pt-4",
className,
)}
>
{payload
.filter((item) => item.type !== "none")
.map((item) => {
// For pie charts, item.value contains the sector name (e.g., "chrome")
// For radial charts, the name is in item.payload[nameKey]
// For other charts, item.dataKey contains the series name (e.g., "desktop")
const payloadName =
nameKey && item.payload
? (item.payload as Record<string, unknown>)[nameKey]
: undefined;
const key = `${payloadName ?? item.value ?? item.dataKey ?? "value"}`;
const itemConfig = getPayloadConfigFromPayload(config, item, key);
const isSelected = selected === null || selected === key;
// Get colors count for this item to determine gradient vs solid
const colorsCount = itemConfig ? getColorsCount(itemConfig) : 1;
return (
<div
key={key}
className={cn(
"[&>svg]:text-muted-foreground flex items-center gap-1.5 transition-opacity [&>svg]:h-3 [&>svg]:w-3",
!isSelected && "opacity-30",
isClickable && "cursor-pointer",
)}
onClick={() => {
if (!isClickable) return;
onSelectChange?.(selected === key ? null : key);
}}
>
{itemConfig?.icon && !hideIcon ? (
<itemConfig.icon />
) : (
<LegendIndicator
variant={variant}
dataKey={key}
colorsCount={colorsCount}
/>
)}
{itemConfig?.label}
</div>
);
})}
</div>
);
}
// ---------------------------------------------------------------------------
// Legend indicator — each variant gets its own branch so future variants
// can diverge freely in markup & style.
// ---------------------------------------------------------------------------
function LegendIndicator({
variant,
dataKey,
colorsCount,
}: {
variant: ChartLegendVariant;
dataKey: string;
colorsCount: number;
}) {
const fillStyle = getLegendFillStyle(dataKey, colorsCount);
const outlineStyle = getLegendOutlineStyle(dataKey, colorsCount);
switch (variant) {
case "square":
return <div className="h-2 w-2 shrink-0" style={fillStyle} />;
case "circle":
return <div className="h-2 w-2 shrink-0 rounded-full" style={fillStyle} />;
case "circle-outline":
return (
<div
className="h-2.5 w-2.5 shrink-0 rounded-full p-[1.5px]"
style={outlineStyle}
/>
);
case "vertical-bar":
return <div className="h-3 w-1 shrink-0 rounded-[2px]" style={fillStyle} />;
case "horizontal-bar":
return <div className="h-1 w-3 shrink-0 rounded-[2px]" style={fillStyle} />;
case "rounded-square-outline":
return (
<div
className="h-2.5 w-2.5 shrink-0 rounded-[3px] p-[1.5px]"
style={outlineStyle}
/>
);
case "rounded-square":
default:
return <div className="h-2 w-2 shrink-0 rounded-[2px]" style={fillStyle} />;
}
}
// ---------------------------------------------------------------------------
// Style helpers
// ---------------------------------------------------------------------------
/** Solid fill / gradient background for filled variants. */
function getLegendFillStyle(dataKey: string, colorsCount: number): React.CSSProperties {
if (colorsCount <= 1) {
return { backgroundColor: `var(--color-${dataKey}-0)` };
}
const stops = Array.from({ length: colorsCount }, (_, i) => {
const offset = (i / (colorsCount - 1)) * 100;
return `var(--color-${dataKey}-${i}) ${offset}%`;
}).join(", ");
return { background: `linear-gradient(to right, ${stops})` };
}
/**
* Outline style for stroke variants.
* Uses background + mask-composite to punch out the center, leaving only the
* "border" visible. Works with both solid colors and gradients, and respects
* border-radius — unlike plain `border-color`.
*/
function getLegendOutlineStyle(dataKey: string, colorsCount: number): React.CSSProperties {
const maskStyle: React.CSSProperties = {
WebkitMask:
"linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0)",
WebkitMaskComposite: "xor",
mask: "linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0)",
maskComposite: "exclude",
};
if (colorsCount <= 1) {
return {
backgroundColor: `var(--color-${dataKey}-0)`,
...maskStyle,
};
}
const stops = Array.from({ length: colorsCount }, (_, i) => {
const offset = (i / (colorsCount - 1)) * 100;
return `var(--color-${dataKey}-${i}) ${offset}%`;
}).join(", ");
return {
background: `linear-gradient(to right, ${stops})`,
...maskStyle,
};
}
const ChartLegend = RechartsPrimitive.Legend;
export { ChartLegend, ChartLegendContent, type ChartLegendVariant };
src/components/evilcharts/ui/background.tsx
"use client";
import { ZIndexLayer } from "recharts";
import { useId } from "react";
// ── Background Variant Types ─────────────────────────────────────────────────
// To add a new variant:
// 1. Add its name to the BackgroundVariant union type below
// 2. Create a pattern component with PatternProps
// 3. Register it in PATTERN_MAP
export type BackgroundVariant =
| "dots"
| "grid"
| "cross-hatch"
| "diagonal-lines"
| "plus"
| "falling-triangles"
| "4-pointed-star"
| "tiny-checkers"
| "overlapping-circles"
| "wiggle-lines"
| "bubbles";
// ── Pattern Components ───────────────────────────────────────────────────────
type PatternProps = { id: string };
const DotsPattern = ({ id }: PatternProps) => (
<pattern id={id} x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse">
<circle className="text-border dark:text-border" cx="2" cy="2" r="1" fill="currentColor" />
</pattern>
);
const GridPattern = ({ id }: PatternProps) => (
<pattern id={id} x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse">
<path
className="text-border dark:text-border"
d="M 20 0 L 0 0 0 20"
fill="none"
stroke="currentColor"
strokeWidth="0.5"
/>
</pattern>
);
const CrossHatchPattern = ({ id }: PatternProps) => (
<pattern id={id} x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse">
<path
className="text-border/60 dark:text-border/50"
d="M 0 0 L 20 20 M 20 0 L 0 20"
fill="none"
stroke="currentColor"
strokeWidth="0.5"
/>
</pattern>
);
const DiagonalLinesPattern = ({ id }: PatternProps) => (
<pattern
id={id}
x="0"
y="0"
width="6"
height="6"
patternUnits="userSpaceOnUse"
patternTransform="rotate(45)"
>
<line
className="text-border dark:text-border"
x1="0"
y1="0"
x2="0"
y2="6"
stroke="currentColor"
strokeWidth="0.5"
/>
</pattern>
);
const PlusPattern = ({ id }: PatternProps) => (
<pattern id={id} x="0" y="0" width="16" height="16" patternUnits="userSpaceOnUse">
<path
className="text-border dark:text-border"
d="M 8 4 L 8 12 M 4 8 L 12 8"
fill="none"
stroke="currentColor"
strokeWidth="0.5"
strokeLinecap="round"
/>
</pattern>
);
const FallingTrianglesPattern = ({ id }: PatternProps) => (
<pattern id={id} x="0" y="0" width="18" height="36" patternUnits="userSpaceOnUse">
<path
className="text-border dark:text-border"
d="M2 6h12L8 18 2 6zm18 36h12l-6 12-6-12z"
transform="scale(0.5)"
fill="currentColor"
fillOpacity="0.4"
/>
</pattern>
);
const FourPointedStarPattern = ({ id }: PatternProps) => (
<pattern id={id} x="0" y="0" width="16" height="16" patternUnits="userSpaceOnUse">
<polygon
className="text-border dark:text-border"
fillRule="evenodd"
points="5 3 8 4 5 5 4 8 3 5 0 4 3 3 4 0 5 3"
fill="currentColor"
fillOpacity="0.4"
/>
</pattern>
);
const TinyCheckersPattern = ({ id }: PatternProps) => (
<pattern id={id} x="0" y="0" width="8" height="8" patternUnits="userSpaceOnUse">
<path
className="text-border dark:text-border"
fillRule="evenodd"
d="M0 0h4v4H0V0zm4 4h4v4H4V4z"
fill="currentColor"
fillOpacity="0.2"
/>
</pattern>
);
const OverlappingCirclesPattern = ({ id }: PatternProps) => (
<pattern id={id} x="0" y="0" width="40" height="40" patternUnits="userSpaceOnUse">
<path
className="text-border dark:text-border"
fillRule="evenodd"
d="M25 25c0-2.762 2.238-5 5-5s5 2.238 5 5-2.238 5-5 5c0 2.762-2.238 5-5 5s-5-2.238-5-5 2.238-5 5-5zM5 5c0-2.762 2.238-5 5-5s5 2.238 5 5-2.238 5-5 5c0 2.762-2.238 5-5 5S0 12.762 0 10s2.238-5 5-5zm5 4c2.209 0 4-1.791 4-4s-1.791-4-4-4-4 1.791-4 4 1.791 4 4 4zm20 20c2.209 0 4-1.791 4-4s-1.791-4-4-4-4 1.791-4 4 1.791 4 4 4z"
fill="currentColor"
fillOpacity="0.4"
/>
</pattern>
);
const WiggleLinesPattern = ({ id }: PatternProps) => (
<pattern
id={id}
x="0"
y="0"
width="52"
height="26"
patternUnits="userSpaceOnUse"
patternTransform="scale(0.6)"
>
<path
className="text-border dark:text-border"
d="M10 10c0-2.21-1.79-4-4-4-3.314 0-6-2.686-6-6h2c0 2.21 1.79 4 4 4 3.314 0 6 2.686 6 6 0 2.21 1.79 4 4 4 3.314 0 6 2.686 6 6 0 2.21 1.79 4 4 4v2c-3.314 0-6-2.686-6-6 0-2.21-1.79-4-4-4-3.314 0-6-2.686-6-6zm25.464-1.95l8.486 8.486-1.414 1.414-8.486-8.486 1.414-1.414z"
fill="currentColor"
fillOpacity="0.4"
/>
</pattern>
);
const BubblesPattern = ({ id }: PatternProps) => (
<pattern
id={id}
x="0"
y="0"
width="100"
height="100"
patternUnits="userSpaceOnUse"
patternTransform="scale(0.6667)"
>
<path
className="text-border dark:text-border"
d="M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z"
fill="currentColor"
fillOpacity="0.4"
fillRule="evenodd"
/>
</pattern>
);
// ── Pattern Registry ─────────────────────────────────────────────────────────
// Map variant names to pattern components
const PATTERN_MAP: Record<BackgroundVariant, React.FC<PatternProps>> = {
dots: DotsPattern,
grid: GridPattern,
plus: PlusPattern,
bubbles: BubblesPattern,
"cross-hatch": CrossHatchPattern,
"diagonal-lines": DiagonalLinesPattern,
"falling-triangles": FallingTrianglesPattern,
"4-pointed-star": FourPointedStarPattern,
"tiny-checkers": TinyCheckersPattern,
"overlapping-circles": OverlappingCirclesPattern,
"wiggle-lines": WiggleLinesPattern,
};
// ── Main Component ───────────────────────────────────────────────────────────
// Usage: Place <ChartBackground variant="dots" /> inside any Recharts chart component.
// ZIndexLayer with zIndex={-1} ensures the background renders behind all chart content.
interface ChartBackgroundProps {
variant: BackgroundVariant;
}
export function ChartBackground({ variant }: ChartBackgroundProps) {
const baseId = useId().replace(/:/g, "");
const patternId = `${baseId}-bg-${variant}`;
const maskId = `${baseId}-bg-edge-fade`;
const filterId = `${baseId}-bg-blur`;
const PatternComponent = PATTERN_MAP[variant];
return (
<ZIndexLayer zIndex={-1}>
<defs>
<PatternComponent id={patternId} />
{/* Gaussian blur filter for soft edge fade */}
<filter id={filterId}>
<feGaussianBlur stdDeviation="25" />
</filter>
{/* Mask: a slightly inset white rect with blur creates smooth transparent edges */}
<mask id={maskId} maskUnits="userSpaceOnUse">
<rect x="8%" y="20%" width="85%" height="60%" fill="white" filter={`url(#${filterId})`} />
</mask>
</defs>
<rect width="100%" height="100%" fill={`url(#${patternId})`} mask={`url(#${maskId})`} />
</ZIndexLayer>
);
}
src/components/evilcharts/ui/dot.tsx
import { cn } from "@/lib/utils";
import * as React from "react";
export type DotVariant = "default" | "border" | "colored-border";
type ChartDotProps = {
cx?: number;
cy?: number;
dataKey: string;
chartId: string;
className?: string;
fillOpacity?: number;
type?: DotVariant;
};
const ChartDot = React.memo(function ChartDot({
cx,
cy,
dataKey,
chartId,
className,
fillOpacity = 1,
type = "default",
}: ChartDotProps) {
const dotId = React.useId().replace(/:/g, "");
const gradientUrl = `url(#${chartId}-colors-${String(dataKey)})`;
if (cx === undefined || cy === undefined) return null;
switch (type) {
case "border":
return (
<PrimaryBorderDot
cx={cx}
cy={cy}
dotId={dotId}
fillOpacity={fillOpacity}
gradientUrl={gradientUrl}
className={className}
/>
);
case "colored-border":
return (
<ColoredBorderDot
cx={cx}
cy={cy}
dotId={dotId}
fillOpacity={fillOpacity}
gradientUrl={gradientUrl}
className={className}
/>
);
default:
return (
<DefaultDot
cx={cx}
cy={cy}
dotId={dotId}
fillOpacity={fillOpacity}
gradientUrl={gradientUrl}
className={className}
/>
);
}
});
type DotVariantProps = {
cx: number;
cy: number;
dotId: string;
fillOpacity: number;
gradientUrl: string;
className?: string;
};
const DefaultDot = React.memo(
({ cx, cy, dotId, fillOpacity, gradientUrl, className }: DotVariantProps) => {
const r = 3;
return (
<g className={className}>
<defs>
<clipPath id={`dot-clip-${dotId}`}>
<circle cx={cx} cy={cy} r={r} />
</clipPath>
</defs>
{/* Full-width gradient rectangle clipped to dot shape */}
<rect
x="0"
y={cy - r}
width="100%"
height={r * 2}
fill={gradientUrl}
fillOpacity={fillOpacity}
clipPath={`url(#dot-clip-${dotId})`}
/>
</g>
);
},
);
DefaultDot.displayName = "DefaultDot";
const PrimaryBorderDot = React.memo(
({ cx, cy, dotId, fillOpacity, gradientUrl, className }: DotVariantProps) => {
const r = 6;
const strokeWidth = 5;
return (
<g className={cn(className, "text-background")}>
<defs>
<clipPath id={`dot-clip-${dotId}`}>
<circle cx={cx} cy={cy} r={r} />
</clipPath>
</defs>
{/* Background stroke (border) */}
<circle cx={cx} cy={cy} r={r} fill="currentColor" />
{/* Inner gradient circle clipped */}
<rect
x="0"
y={cy - (r - strokeWidth / 2)}
width="100%"
height={(r - strokeWidth / 2) * 2}
fill={gradientUrl}
fillOpacity={fillOpacity}
clipPath={`url(#dot-clip-inner-${dotId})`}
/>
<defs>
<clipPath id={`dot-clip-inner-${dotId}`}>
<circle cx={cx} cy={cy} r={r - strokeWidth / 2} />
</clipPath>
</defs>
</g>
);
},
);
PrimaryBorderDot.displayName = "PrimaryBorderDot";
const ColoredBorderDot = React.memo(
({ cx, cy, dotId, fillOpacity, gradientUrl, className }: DotVariantProps) => {
const r = 3;
const strokeWidth = 1;
return (
<g className={cn(className, "text-background")}>
<defs>
<clipPath id={`dot-clip-${dotId}`}>
<circle cx={cx} cy={cy} r={r + strokeWidth / 2} />
</clipPath>
</defs>
{/* Gradient stroke (border) via clipped rect */}
<rect
x="0"
y={cy - r - strokeWidth / 2}
width="100%"
height={(r + strokeWidth / 2) * 2}
fill={gradientUrl}
fillOpacity={fillOpacity}
clipPath={`url(#dot-clip-${dotId})`}
/>
{/* Inner solid fill */}
<circle cx={cx} cy={cy} r={r - strokeWidth / 2} fill="currentColor" />
</g>
);
},
);
ColoredBorderDot.displayName = "ColoredBorderDot";
export { ChartDot };
src/components/evilcharts/ui/evil-brush.tsx
"use client";
import { motion, useMotionValue, useMotionValueEvent, useSpring, useTransform } from "motion/react";
import { ResponsiveContainer, AreaChart, Area, LineChart, Line, BarChart, Bar } from "recharts";
import { ChartStyle, getColorsCount, type ChartConfig } from "@/components/evilcharts/ui/chart";
import type { MotionValue } from "motion/react";
import { useCallback, useEffect, type ComponentProps } from "react";
import { cn } from "@/lib/utils";
import * as React from "react";
// ─── Types ──────────────────────────────────────────────────────────────────
type EvilBrushVariant = "line" | "area" | "bar";
type CurveType = ComponentProps<typeof Area>["type"];
interface EvilBrushRange {
startIndex: number;
endIndex: number;
}
interface EvilBrushProps {
/** Full dataset – always rendered in the miniature chart */
data: Record<string, unknown>[];
/** Chart config with colour definitions */
chartConfig: ChartConfig;
/** Data keys to plot (default: all keys from chartConfig) */
dataKeys?: string[];
/** X-axis data key – used for handle labels */
xDataKey?: string;
/** Visual variant of the mini chart */
variant?: EvilBrushVariant;
/** Pixel height of the brush */
height?: number;
/** Extra className */
className?: string;
/** Whether areas/bars should be stacked in the mini chart */
stacked?: boolean;
/** Stroke variant for line / area strokes in the mini chart */
strokeVariant?: "solid" | "dashed" | "animated-dashed";
/** Whether to connect null data points in line / area variants */
connectNulls?: boolean;
/** Radius for bar corners in the bar variant */
barRadius?: number;
// ── Controlled mode ──────────────────────────────────────────────────
/** Controlled start index */
startIndex?: number;
/** Controlled end index */
endIndex?: number;
// ── Uncontrolled mode ────────────────────────────────────────────────
/** Initial start index (uncontrolled) */
defaultStartIndex?: number;
/** Initial end index (uncontrolled) */
defaultEndIndex?: number;
/** Fired whenever the visible range changes */
onChange?: (range: EvilBrushRange) => void;
/** Format the handle label from the xDataKey value */
formatLabel?: (value: unknown, index: number) => string;
/** Curve type for line / area variants */
curveType?: CurveType;
/** Minimum number of data points that must remain selected */
minSpan?: number;
/** Whether to render labels on the handles */
showLabels?: boolean;
/** Skip rendering own ChartStyle (when inside a ChartContainer that already provides CSS vars) */
skipStyle?: boolean;
}
// ─── Spring config ──────────────────────────────────────────────────────────
const SPRING_CONFIG = { stiffness: 300, damping: 35, mass: 0.8 };
// ─── Pointer-capture drag hook ──────────────────────────────────────────────
// Replaces raw addEventListener with the modern Pointer Events API.
// setPointerCapture routes all pointer events to the originating element,
// so we get mouse + touch + pen support with zero global listeners.
type DragType = "left" | "right" | "middle";
interface DragState {
type: DragType;
originX: number;
originRange: EvilBrushRange;
}
function useBrushDrag({
range,
totalPoints,
containerRef,
commit,
}: {
range: EvilBrushRange;
totalPoints: number;
containerRef: React.RefObject<HTMLDivElement | null>;
commit: (next: EvilBrushRange, mode?: DragType) => void;
}) {
const dragRef = React.useRef<DragState | null>(null);
const [isDragging, setIsDragging] = React.useState(false);
const toIndexDelta = useCallback(
(px: number) => {
if (!containerRef.current || totalPoints <= 1) return 0;
return Math.round(
(px / containerRef.current.getBoundingClientRect().width) * (totalPoints - 1),
);
},
[totalPoints, containerRef],
);
const onPointerDown = useCallback(
(e: React.PointerEvent, type: DragType) => {
e.preventDefault();
(e.target as HTMLElement).setPointerCapture(e.pointerId);
dragRef.current = { type, originX: e.clientX, originRange: { ...range } };
setIsDragging(true);
},
[range],
);
const onPointerMove = useCallback(
(e: React.PointerEvent) => {
const d = dragRef.current;
if (!d) return;
const delta = toIndexDelta(e.clientX - d.originX);
const { type, originRange: o } = d;
if (type === "left") {
commit({ startIndex: o.startIndex + delta, endIndex: o.endIndex }, "left");
} else if (type === "right") {
commit({ startIndex: o.startIndex, endIndex: o.endIndex + delta }, "right");
} else {
const span = o.endIndex - o.startIndex;
let s = o.startIndex + delta;
let e2 = s + span;
if (s < 0) {
s = 0;
e2 = span;
}
if (e2 > totalPoints - 1) {
e2 = totalPoints - 1;
s = Math.max(0, e2 - span);
}
commit({ startIndex: s, endIndex: e2 }, "middle");
}
},
[toIndexDelta, totalPoints, commit],
);
const onPointerUp = useCallback((e: React.PointerEvent) => {
(e.target as HTMLElement).releasePointerCapture(e.pointerId);
dragRef.current = null;
setIsDragging(false);
}, []);
// Helper to bind all three pointer handlers for a given drag type
const bind = useCallback(
(type: DragType) => ({
onPointerDown: (e: React.PointerEvent) => onPointerDown(e, type),
onPointerMove,
onPointerUp,
}),
[onPointerDown, onPointerMove, onPointerUp],
);
return { isDragging, bind };
}
// ─── EvilBrush ────────────────────────────────────────────────────────────
function EvilBrush({
data,
chartConfig,
dataKeys,
xDataKey,
variant = "area",
height = 56,
className,
stacked = false,
strokeVariant = "solid",
connectNulls = false,
barRadius,
startIndex: controlledStart,
endIndex: controlledEnd,
defaultStartIndex = 0,
defaultEndIndex,
onChange,
formatLabel,
curveType = "monotone",
minSpan = 2,
showLabels = true,
skipStyle = false,
}: EvilBrushProps) {
const containerRef = React.useRef<HTMLDivElement>(null);
const keys = React.useMemo(() => dataKeys ?? Object.keys(chartConfig), [dataKeys, chartConfig]);
const totalPoints = data.length;
const chartId = React.useId().replace(/:/g, "");
// ── Controlled vs uncontrolled ──────────────────────────────────────────
const isControlled = controlledStart !== undefined && controlledEnd !== undefined;
const [internalRange, setInternalRange] = React.useState<EvilBrushRange>(() => ({
startIndex: Math.max(0, Math.min(defaultStartIndex, totalPoints - 1)),
endIndex: Math.max(0, Math.min(defaultEndIndex ?? totalPoints - 1, totalPoints - 1)),
}));
// Track the last committed range to avoid duplicate updates when small
// mouse movements don't produce index changes (e.g., at boundaries)
const lastCommittedRef = React.useRef<EvilBrushRange>(internalRange);
useEffect(() => {
if (!isControlled) {
setInternalRange((prev) => {
const adjusted = {
startIndex: Math.min(prev.startIndex, Math.max(0, totalPoints - 1)),
endIndex: Math.min(prev.endIndex, Math.max(0, totalPoints - 1)),
};
lastCommittedRef.current = adjusted;
return adjusted;
});
}
}, [totalPoints, isControlled]);
// ── Clamping & committing ───────────────────────────────────────────────
const clampRange = useCallback(
(range: EvilBrushRange, mode?: DragType): EvilBrushRange => {
let { startIndex, endIndex } = range;
const maxIndex = Math.max(0, totalPoints - 1);
startIndex = Math.max(0, Math.min(startIndex, maxIndex));
endIndex = Math.max(0, Math.min(endIndex, maxIndex));
if (mode === "left") {
const maxStart = Math.max(0, endIndex - minSpan);
startIndex = Math.min(startIndex, maxStart);
return { startIndex, endIndex };
}
if (mode === "right") {
const minEnd = Math.min(maxIndex, startIndex + minSpan);
endIndex = Math.max(endIndex, minEnd);
return { startIndex, endIndex };
}
if (endIndex - startIndex < minSpan) {
endIndex = Math.min(startIndex + minSpan, maxIndex);
if (endIndex - startIndex < minSpan) {
startIndex = Math.max(0, endIndex - minSpan);
}
}
return { startIndex, endIndex };
},
[totalPoints, minSpan],
);
const commit = useCallback(
(next: EvilBrushRange, mode?: DragType) => {
const clamped = clampRange(next, mode);
const last = lastCommittedRef.current;
// Only update if the range has actually changed — avoids unnecessary
// re-renders when the brush is at a boundary and small mouse movements
// don't produce index changes
if (last.startIndex === clamped.startIndex && last.endIndex === clamped.endIndex) {
return;
}
lastCommittedRef.current = clamped;
setInternalRange(clamped);
// Defer the parent callback — chart re-render happens at lower priority,
// React can skip intermediate frames during fast drags
React.startTransition(() => {
onChange?.(clamped);
});
},
[clampRange, onChange],
);
// ── Drag ────────────────────────────────────────────────────────────────
const { isDragging, bind } = useBrushDrag({
range: internalRange,
totalPoints,
containerRef,
commit,
});
// Position always driven by internalRange (never lags behind controlled props)
const range = internalRange;
// Sync internalRange with controlled props when not dragging
useEffect(() => {
if (isControlled && !isDragging) {
const syncedRange = { startIndex: controlledStart, endIndex: controlledEnd };
// eslint-disable-next-line react-hooks/set-state-in-effect
setInternalRange(syncedRange);
lastCommittedRef.current = syncedRange;
}
}, [isControlled, controlledStart, controlledEnd, isDragging]);
// ── Computed positions (%) ──────────────────────────────────────────────
const leftPct = totalPoints > 1 ? (range.startIndex / (totalPoints - 1)) * 100 : 0;
const rightPct = totalPoints > 1 ? (range.endIndex / (totalPoints - 1)) * 100 : 100;
// Drive all moving brush UI from the same springed edge values.
const leftTarget = useMotionValue(leftPct);
const rightTarget = useMotionValue(rightPct);
if (leftTarget.get() !== leftPct) leftTarget.set(leftPct);
if (rightTarget.get() !== rightPct) rightTarget.set(rightPct);
const leftSpring = useSpring(leftTarget, SPRING_CONFIG);
const rightSpring = useSpring(rightTarget, SPRING_CONFIG);
const leftPosition = useTransform(leftSpring, (v) => `${v}%`);
const rightPosition = useTransform(rightSpring, (v) => `${v}%`);
const leftOverlayWidth = useTransform(leftSpring, (v) => `${v}%`);
const rightOverlayWidth = useTransform(rightSpring, (v) => `${Math.max(0, 100 - v)}%`);
const selectedWidth = useMotionValue(`${Math.max(0, rightPct - leftPct)}%`);
const updateSelectedWidth = useCallback(() => {
selectedWidth.set(`${Math.max(0, rightSpring.get() - leftSpring.get())}%`);
}, [leftSpring, rightSpring, selectedWidth]);
useMotionValueEvent(leftSpring, "change", updateSelectedWidth);
useMotionValueEvent(rightSpring, "change", updateSelectedWidth);
const getLabel = useCallback(
(idx: number) => {
if (!xDataKey) return String(idx);
const v = data[idx]?.[xDataKey];
return formatLabel ? formatLabel(v, idx) : String(v ?? idx);
},
[data, xDataKey, formatLabel],
);
// ── Render ──────────────────────────────────────────────────────────────
if (totalPoints === 0) return null;
return (
<div
ref={containerRef}
data-chart={skipStyle ? undefined : chartId}
className={cn("group relative select-none", className)}
style={{ height }}
>
{!skipStyle && <ChartStyle id={chartId} config={chartConfig} />}
{/* Mini chart – always shows all data */}
<div className="absolute inset-0 overflow-hidden rounded-md">
<MiniChart
data={data}
keys={keys}
chartConfig={chartConfig}
variant={variant}
curveType={curveType}
chartId={chartId}
stacked={stacked}
strokeVariant={strokeVariant === "animated-dashed" ? "dashed" : strokeVariant}
connectNulls={connectNulls}
barRadius={barRadius}
/>
</div>
{/* Dim overlay – left */}
<motion.div
className="bg-background/70 pointer-events-none absolute inset-y-0 left-0 rounded-l-md"
style={{ width: leftOverlayWidth }}
/>
{/* Dim overlay – right */}
<motion.div
className="bg-background/70 pointer-events-none absolute inset-y-0 right-0 rounded-r-md"
style={{ width: rightOverlayWidth }}
/>
{/* Selected region – draggable to pan */}
<motion.div
className="absolute inset-y-0 cursor-grab touch-none rounded-sm border active:cursor-grabbing"
style={{ left: leftPosition, width: selectedWidth }}
{...bind("middle")}
/>
{/* Left handle */}
<BrushHandle
side="left"
position={leftPosition}
label={showLabels ? getLabel(range.startIndex) : undefined}
bind={bind("left")}
/>
{/* Right handle */}
<BrushHandle
side="right"
position={rightPosition}
label={showLabels ? getLabel(range.endIndex) : undefined}
bind={bind("right")}
/>
</div>
);
}
// ─── Brush Handle ───────────────────────────────────────────────────────────
function BrushHandle({
side,
position,
label,
bind,
}: {
side: "left" | "right";
position: MotionValue<string>;
label?: string;
bind: {
onPointerDown: (e: React.PointerEvent) => void;
onPointerMove: (e: React.PointerEvent) => void;
onPointerUp: (e: React.PointerEvent) => void;
};
}) {
const isLeft = side === "left";
return (
<motion.div className="absolute inset-y-0 z-10" style={{ left: position }}>
<div
className={cn(
"group absolute inset-y-0 flex w-3 cursor-ew-resize touch-none items-center justify-center after:absolute after:inset-y-0 after:-left-4 after:w-11 after:content-['']",
isLeft ? "" : "-translate-x-full",
)}
{...bind}
>
<div
className={cn(
"bg-muted-foreground group-hover:bg-foreground relative flex h-4 w-1.5 items-center justify-center rounded-md transition-colors",
isLeft ? "-left-[5.5px]" : "-right-[5.5px]",
)}
>
<div className="flex flex-col gap-[2px]">
<div className="bg-background/70 h-[2px] w-[2px] rounded-full" />
<div className="bg-background/70 h-[2px] w-[2px] rounded-full" />
<div className="bg-background/70 h-[2px] w-[2px] rounded-full" />
</div>
</div>
</div>
{label && (
<div
className={cn(
"bg-foreground text-background pointer-events-none absolute -bottom-3 -translate-y-1/2 rounded-[3px] px-1 py-px text-[8px] leading-tight font-medium whitespace-nowrap opacity-0 group-hover:opacity-100",
isLeft ? "left-1.5" : "right-1.5",
)}
>
{label}
</div>
)}
</motion.div>
);
}
// ─── Mini Chart ─────────────────────────────────────────────────────────────
function MiniChart({
data,
keys,
chartConfig,
variant,
curveType,
chartId,
stacked,
strokeVariant = "solid",
connectNulls = false,
barRadius,
}: {
data: Record<string, unknown>[];
keys: string[];
chartConfig: ChartConfig;
variant: EvilBrushVariant;
curveType: CurveType;
chartId: string;
stacked: boolean;
strokeVariant?: "solid" | "dashed" | "animated-dashed";
connectNulls?: boolean;
barRadius?: number;
}) {
const gradients = React.useMemo(
() =>
Object.entries(chartConfig)
.filter(([key]) => keys.includes(key))
.map(([dataKey, config]) => ({
dataKey,
colorsCount: getColorsCount(config),
})),
[chartConfig, keys],
);
const dashArray =
strokeVariant === "dashed" || strokeVariant === "animated-dashed" ? "4 4" : undefined;
const defsContent = (
<>
{/* Vertical fade gradient for area fill mask */}
{variant === "area" && (
<linearGradient id={`${chartId}-zm-vertical-fade`} x1="0" y1="0" x2="0" y2="1">
<stop offset="0%" stopColor="white" stopOpacity={0.15} />
<stop offset="100%" stopColor="white" stopOpacity={0} />
</linearGradient>
)}
{gradients.map(({ dataKey, colorsCount }) => {
const colorStops =
colorsCount === 1 ? (
<>
<stop offset="0%" stopColor={`var(--color-${dataKey}-0)`} />
<stop offset="100%" stopColor={`var(--color-${dataKey}-0)`} />
</>
) : (
Array.from({ length: colorsCount }, (_, i) => (
<stop
key={i}
offset={`${(i / (colorsCount - 1)) * 100}%`}
stopColor={`var(--color-${dataKey}-${i}, var(--color-${dataKey}-0))`}
/>
))
);
return (
<React.Fragment key={dataKey}>
{/* Vertical color gradient (stroke + bar fill) */}
<linearGradient id={`${chartId}-zm-${dataKey}`} x1="0" y1="0" x2="0" y2="1">
{colorStops}
</linearGradient>
{/* Area fill: color gradient masked with vertical fade */}
{variant === "area" && (
<>
<mask id={`${chartId}-zm-fill-mask-${dataKey}`}>
<rect width="100%" height="100%" fill={`url(#${chartId}-zm-vertical-fade)`} />
</mask>
<pattern
id={`${chartId}-zm-fill-${dataKey}`}
patternUnits="userSpaceOnUse"
width="100%"
height="100%"
>
<rect
width="100%"
height="100%"
fill={`url(#${chartId}-zm-${dataKey})`}
mask={`url(#${chartId}-zm-fill-mask-${dataKey})`}
/>
</pattern>
</>
)}
</React.Fragment>
);
})}
</>
);
if (variant === "line") {
return (
<ResponsiveContainer width="100%" height="100%">
<LineChart data={data} margin={{ top: 4, right: 0, bottom: 0, left: 0 }}>
<defs>{defsContent}</defs>
{keys.map((dk) => (
<Line
key={dk}
type={curveType}
dataKey={dk}
stroke={`url(#${chartId}-zm-${dk})`}
strokeWidth={1}
strokeOpacity={0.5}
strokeDasharray={dashArray}
connectNulls={connectNulls}
dot={false}
activeDot={false}
isAnimationActive={false}
/>
))}
</LineChart>
</ResponsiveContainer>
);
}
if (variant === "bar") {
const r = barRadius ?? 3;
return (
<ResponsiveContainer width="100%" height="100%">
<BarChart
data={data}
margin={{ top: 2, right: 0, bottom: 0, left: 0 }}
barGap={2}
barSize={14}
>
<defs>{defsContent}</defs>
{keys.map((dk) => (
<Bar
key={dk}
dataKey={dk}
fill={`url(#${chartId}-zm-${dk})`}
fillOpacity={0.35}
stackId={stacked ? "zm-stack" : undefined}
isAnimationActive={false}
radius={[r, r, r, r]}
/>
))}
</BarChart>
</ResponsiveContainer>
);
}
// Default: area
return (
<ResponsiveContainer width="100%" height="100%">
<AreaChart data={data} margin={{ top: 4, right: 0, bottom: 0, left: 0 }}>
<defs>{defsContent}</defs>
{keys.map((dk) => (
<Area
key={dk}
type={curveType}
dataKey={dk}
stroke={`url(#${chartId}-zm-${dk})`}
fill={`url(#${chartId}-zm-fill-${dk})`}
strokeWidth={1}
strokeOpacity={0.5}
strokeDasharray={dashArray}
connectNulls={connectNulls}
fillOpacity={1}
stackId={stacked ? "zm-stack" : undefined}
dot={false}
activeDot={false}
isAnimationActive={false}
/>
))}
</AreaChart>
</ResponsiveContainer>
);
}
// ─── useEvilBrush Hook ──────────────────────────────────────────────────────
function useEvilBrush<TData extends Record<string, unknown>>({
data,
defaultStartIndex = 0,
defaultEndIndex,
}: {
data: TData[];
defaultStartIndex?: number;
defaultEndIndex?: number;
}) {
const [range, setRange] = React.useState<EvilBrushRange>({
startIndex: defaultStartIndex,
endIndex: defaultEndIndex ?? Math.max(0, data.length - 1),
});
// Defer the range used for data slicing — the brush handles move at the
// immediate `range` cadence while the expensive chart re-render uses the
// deferred value. React can skip intermediate slices during fast drags.
const deferredRange = React.useDeferredValue(range);
useEffect(() => {
// eslint-disable-next-line react-hooks/set-state-in-effect
setRange({
startIndex: 0,
endIndex: Math.max(0, data.length - 1),
});
}, [data.length]);
const visibleData = React.useMemo(
() => data.slice(deferredRange.startIndex, deferredRange.endIndex + 1),
[data, deferredRange.startIndex, deferredRange.endIndex],
);
return {
range,
visibleData,
brushProps: {
startIndex: range.startIndex,
endIndex: range.endIndex,
onChange: setRange,
} satisfies Pick<EvilBrushProps, "startIndex" | "endIndex" | "onChange">,
};
}
export { EvilBrush, useEvilBrush, type EvilBrushProps, type EvilBrushRange, type EvilBrushVariant };