# 8-bit Chart Bar

> A simple 8-bit chart bar component

A shadcn/ui block from the [@8bitcn](https://www.8bitcn.com) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/8bitcn/chart-bar).

- Page, with a live preview: https://shadcn.exchange/r/8bitcn/chart-bar
- Screenshot: https://abzjhwgwpdpz7ua5.public.blob.vercel-storage.com/shots/8bitcn/chart-bar-light-31c2332505319650.png
- Registry item: https://www.8bitcn.com/r/chart-bar.json
- Categories: charts
- Listed: 2026-10-13, source last changed 2026-10-13

## Install

```bash
npx shadcn@latest add https://www.8bitcn.com/r/chart-bar.json
```

Run it in a project that has shadcn/ui set up. It adds the files below and installs what they depend on.

## Dependencies

- Registry items: `chart`

## Files

### `components/ui/8bit/blocks/chart-bar.tsx`

```tsx
"use client";

import { Bar, BarChart, CartesianGrid, XAxis } from "recharts";

import {
  type ChartConfig,
  ChartContainer,
  ChartTooltip,
  ChartTooltipContent,
} from "@/components/ui/8bit/chart";

export const description = "A multiple bar chart";

const chartData = [
  { month: "January", desktop: 186, mobile: 80 },
  { month: "February", desktop: 305, mobile: 200 },
  { month: "March", desktop: 237, mobile: 120 },
  { month: "April", desktop: 73, mobile: 190 },
  { month: "May", desktop: 209, mobile: 130 },
  { month: "June", desktop: 214, mobile: 140 },
];

const chartConfig = {
  desktop: {
    label: "Desktop",
    color: "var(--chart-1)",
  },
  mobile: {
    label: "Mobile",
    color: "var(--chart-2)",
  },
} satisfies ChartConfig;

export default function ChartBarMultiple() {
  return (
    <ChartContainer config={chartConfig}>
      <BarChart data={chartData}>
        <CartesianGrid vertical={false} />
        <XAxis
          dataKey="month"
          tickLine={false}
          tickMargin={10}
          axisLine={false}
          tickFormatter={(value) => value.slice(0, 3)}
        />
        <ChartTooltip
          cursor={false}
          content={<ChartTooltipContent indicator="dot" />}
        />
        <Bar dataKey="desktop" fill="var(--color-desktop)" />
        <Bar dataKey="mobile" fill="var(--color-mobile)" />
      </BarChart>
    </ChartContainer>
  );
}
```

### `components/ui/8bit/chart.tsx`

```tsx
"use client";

import * as React from "react";

import * as RechartsPrimitive from "recharts";

import { cn } from "@/lib/utils";

// Format: { THEME_NAME: CSS_SELECTOR }
const THEMES = { light: "", dark: ".dark" } as const;

export type ChartConfig = {
  [k in string]: {
    label?: React.ReactNode;
    icon?: React.ComponentType;
  } & (
    | { color?: string; theme?: never }
    | { color?: never; theme: Record<keyof typeof THEMES, string> }
  );
};

type ChartContextProps = {
  config: ChartConfig;
};

const ChartContext = React.createContext<ChartContextProps | null>(null);

function useChart() {
  const context = React.useContext(ChartContext);

  if (!context) {
    throw new Error("useChart must be used within a <ChartContainer />");
  }

  return context;
}

function ChartContainer({
  id,
  className,
  children,
  config,
  ...props
}: React.ComponentProps<"div"> & {
  config: ChartConfig;
  children: React.ComponentProps<
    typeof RechartsPrimitive.ResponsiveContainer
  >["children"];
}) {
  const uniqueId = React.useId();
  const chartId = `chart-${id || uniqueId.replace(/:/g, "")}`;

  return (
    <ChartContext.Provider value={{ config }}>
      <div
        data-slot="chart"
        data-chart={chartId}
        className={cn(
          "[&_.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 flex aspect-video 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",
          className
        )}
        {...props}
      >
        <ChartStyle id={chartId} config={config} />
        <RechartsPrimitive.ResponsiveContainer>
          {children}
        </RechartsPrimitive.ResponsiveContainer>
      </div>
    </ChartContext.Provider>
  );
}

const ChartStyle = ({ id, config }: { id: string; config: ChartConfig }) => {
  const colorConfig = Object.entries(config).filter(
    ([, config]) => config.theme || config.color
  );

  if (!colorConfig.length) {
    return null;
  }

  return (
    <style
      dangerouslySetInnerHTML={{
        __html: Object.entries(THEMES)
          .map(
            ([theme, prefix]) => `
${prefix} [data-chart=${id}] {
${colorConfig
  .map(([key, itemConfig]) => {
    const color =
      itemConfig.theme?.[theme as keyof typeof itemConfig.theme] ||
      itemConfig.color;
    return color ? `  --color-${key}: ${color};` : null;
  })
  .join("\n")}
}
`
          )
          .join("\n"),
      }}
    />
  );
};

const ChartTooltip = RechartsPrimitive.Tooltip;

function ChartTooltipContent({
  active,
  payload,
  className,
  indicator = "dot",
  hideLabel = false,
  hideIndicator = false,
  label,
  labelFormatter,
  labelClassName,
  formatter,
  color,
  nameKey,
  labelKey,
}: Partial<RechartsPrimitive.TooltipContentProps> &
  React.ComponentProps<"div"> & {
    hideLabel?: boolean;
    hideIndicator?: boolean;
    indicator?: "line" | "dot" | "dashed";
    nameKey?: string;
    labelKey?: string;
    color?: string;
  }) {
  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 as keyof typeof config]?.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) {
    return null;
  }

  const nestLabel = payload.length === 1 && indicator !== "dot";

  return (
    <div
      className={cn(
        "relative border-y-6 border-foreground dark:border-ring bg-background grid min-w-[8rem] items-start gap-1.5 px-2.5 py-1.5 text-xs shadow-xl",
        className
      )}
    >
      <div
        className="absolute inset-0 border-x-6 -mx-1.5 border-foreground dark:border-ring pointer-events-none"
        aria-hidden="true"
      />
      {!nestLabel ? tooltipLabel : null}
      <div className="grid gap-1.5">
        {payload.map((item, index) => {
          const key = `${nameKey || item.name || item.dataKey || "value"}`;
          const itemConfig = getPayloadConfigFromPayload(config, item, key);
          const indicatorColor = color || item.payload.fill || item.color;

          return (
            <div
              key={`${item.dataKey}`}
              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"
              )}
            >
              {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 border-(--color-border) bg-(--color-bg)",
                          {
                            "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={
                          {
                            "--color-bg": indicatorColor,
                            "--color-border": indicatorColor,
                          } as React.CSSProperties
                        }
                      />
                    )
                  )}
                  <div
                    className={cn(
                      "flex flex-1 justify-between 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>
                      {item.value && (
                        <span className="text-foreground font-medium tabular-nums">
                          {item.value.toLocaleString()}
                        </span>
                      )}
                    </div>
                  </div>
                </>
              )}
            </div>
          );
        })}
      </div>
    </div>
  );
}

const ChartLegend = RechartsPrimitive.Legend;

function ChartLegendContent({
  className,
  hideIcon = false,
  payload,
  verticalAlign = "bottom",
  nameKey,
}: React.ComponentProps<"div"> &
  Pick<RechartsPrimitive.DefaultLegendContentProps, "payload" | "verticalAlign"> & {
    hideIcon?: boolean;
    nameKey?: string;
  }) {
  const { config } = useChart();

  if (!payload?.length) {
    return null;
  }

  return (
    <div
      className={cn(
        "flex items-center justify-center gap-4",
        verticalAlign === "top" ? "pb-3" : "pt-3",
        className
      )}
    >
      {payload.map((item) => {
        const key = `${nameKey || item.dataKey || "value"}`;
        const itemConfig = getPayloadConfigFromPayload(config, item, key);

        return (
          <div
            key={item.value}
            className={cn(
              "[&>svg]:text-muted-foreground flex items-center gap-1.5 [&>svg]:h-3 [&>svg]:w-3"
            )}
          >
            {itemConfig?.icon && !hideIcon ? (
              <itemConfig.icon />
            ) : (
              <div
                className="h-2 w-2 shrink-0"
                style={{
                  backgroundColor: item.color,
                }}
              />
            )}
            {itemConfig?.label}
          </div>
        );
      })}
    </div>
  );
}

// Helper to extract item config from a payload.
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 as keyof typeof config];
}

export {
  ChartContainer,
  ChartTooltip,
  ChartTooltipContent,
  ChartLegend,
  ChartLegendContent,
  ChartStyle,
};
```

### `components/ui/8bit/styles/retro.css`

```css
@import url("https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap");

.retro {
  font-family:
    "Press Start 2P",
    system-ui,
    -apple-system,
    sans-serif;
  line-height: 1.5;
  letter-spacing: 0.5px;
}

.pixelated {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}
```