Dumbbell Chart

Installation

Examples

Props

Used by

Files installed (3)

• src/app/components/ui/charts/dumbbell-chart/dumbbell-chart.component.ts6.5 kB

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  import {
    AfterViewInit,
    Component,
    ElementRef,
    Input,
    OnChanges,
    OnDestroy,
    SimpleChanges,
    ViewChild,
    ChangeDetectionStrategy,
  } from '@angular/core'
  import type * as echarts from 'echarts/core'
  import { cn } from '@/lib/utils'
  import {
    getChartColors,
    getChartTextColor,
    getChartAxisColor,
    getChartSplitLineColor,
    getChartTooltipBg,
    getChartTooltipBorder,
    getChartTooltipText,
    mergeOptionBlock,
  } from '../use-chart-theme'
  
  /**
   * Angular port of the UIPKGE DumbbellChart — before/after dots joined per category via a custom series. Standalone, theme-aware. Same inputs as the React/Vue `DumbbellChart` (`data`, `names`, `height`, `option`).
   */
  @Component({
    changeDetection: ChangeDetectionStrategy.Eager,
    selector: 'ui-dumbbell-chart, [ui-dumbbell-chart]',
    standalone: true,
    host: {
      '[attr.data-slot]': '"dumbbell-chart"',
      '[attr.data-uipkge]': '""',
      '[class]': 'hostClass',
      '[attr.role]': '"img"',
      '[attr.aria-label]': 'ariaLabel || "Chart"',
      '[attr.tabindex]': '0',
      '[style.height]': 'heightStyle',
    },
    template: `<div #chartEl class="size-full"></div>`,
  })
  export class UiDumbbellChartComponent implements AfterViewInit, OnChanges, OnDestroy {
    /** One row per category: compare `a` vs `b`. */
    @Input() data: { label: string; a: number; b: number }[] = []
    /** Series names for [a, b]. Default ['Before', 'After']. */
    @Input() names: [string, string] = ['Before', 'After']
    @Input() height: number | string = 300
    @Input() option?: Record<string, unknown>
    /** Accessible name announced for the chart image. Defaults to "Chart". */
    @Input() ariaLabel?: string
    @Input('class') className?: string
  
    @ViewChild('chartEl', { static: false }) chartEl?: ElementRef<HTMLDivElement>
  
    private chart: echarts.ECharts | null = null
    private unsubscribeTheme: (() => void) | null = null
  
    get hostClass(): string {
      return cn('block focus-visible:ring-ring w-full focus-visible:ring-2 focus-visible:outline-none', this.className)
    }
  
    get heightStyle(): string {
      return /^\d+$/.test(String(this.height)) ? `${this.height}px` : String(this.height)
    }
  
    /** Build the merged ECharts option (pure — no DOM needed, unit-testable). */
    getOption(): Record<string, unknown> {
      const colors = getChartColors()
      const colorA = colors[2]!
      const colorB = colors[0]!
      const axis = getChartAxisColor()
      const series = [
        {
          type: 'custom',
          renderItem: (
            params: { dataIndex: number },
            api: { coord: (p: number[]) => number[]; value: (i: number) => number },
          ) => {
            const y = api.coord([0, params.dataIndex])[1]!
            const a = api.coord([api.value(0), params.dataIndex])
            const b = api.coord([api.value(1), params.dataIndex])
            return {
              type: 'group',
              children: [
                { type: 'line', shape: { x1: a[0], y1: y, x2: b[0], y2: y }, style: { stroke: axis, lineWidth: 2 } },
                { type: 'circle', shape: { cx: a[0], cy: y, r: 6 }, style: { fill: colorA } },
                { type: 'circle', shape: { cx: b[0], cy: y, r: 6 }, style: { fill: colorB } },
              ],
            }
          },
          data: this.data.map((d) => [d.a, d.b]),
        },
      ]
      const userOption: Record<string, any> = this.option ?? {}
      const {
        series: userSeries,
        xAxis: userXAxis,
        yAxis: userYAxis,
        grid: userGrid,
        tooltip: userTooltip,
        ...userRest
      } = userOption
      const mergedSeries = Array.isArray(userSeries) ? series.map((s, i) => ({ ...s, ...(userSeries[i] ?? {}) })) : series
      const rows = this.data
      const names = this.names
      return {
        color: colors,
        grid: mergeOptionBlock(
          { left: 16, right: 16, top: 32, bottom: 24, outerBoundsMode: 'same', outerBoundsContain: 'axisLabel' },
          userGrid,
        ),
        tooltip: mergeOptionBlock(
          {
            trigger: 'item',
            backgroundColor: getChartTooltipBg(),
            borderColor: getChartTooltipBorder(),
            textStyle: { color: getChartTooltipText(), fontSize: 12 },
            formatter: (p: { dataIndex: number; value: [number, number] }) =>
              `${rows[p.dataIndex]?.label}<br/>${names[0]}: ${p.value[0]}<br/>${names[1]}: ${p.value[1]}`,
          },
          userTooltip,
        ),
        legend: {
          bottom: 0,
          icon: 'circle',
          itemWidth: 8,
          itemHeight: 8,
          textStyle: { fontSize: 11, color: getChartTextColor() },
          data: [
            { name: names[0], itemStyle: { color: colorA } },
            { name: names[1], itemStyle: { color: colorB } },
          ],
        },
        xAxis: mergeOptionBlock(
          {
            type: 'value',
            splitLine: { lineStyle: { color: getChartSplitLineColor() } },
            axisLabel: { color: getChartTextColor(), fontSize: 11 },
          },
          userXAxis,
        ),
        yAxis: mergeOptionBlock(
          {
            type: 'category',
            inverse: true,
            data: rows.map((d) => d.label),
            axisLine: { lineStyle: { color: getChartAxisColor() } },
            axisLabel: { color: getChartTextColor(), fontSize: 11 },
            axisTick: { show: false },
          },
          userYAxis,
        ),
        series: mergedSeries,
        ...userRest,
      }
    }
  
    async ngAfterViewInit(): Promise<void> {
      if (typeof window === 'undefined' || !this.chartEl?.nativeElement) return
      const [{ use }, { CanvasRenderer }, { CustomChart: EChartsCustomChart }, comps] = await Promise.all([
        import('echarts/core'),
        import('echarts/renderers'),
        import('echarts/charts'),
        import('echarts/components'),
      ])
      use([CanvasRenderer, EChartsCustomChart, comps.GridComponent, comps.TooltipComponent, comps.LegendComponent])
      const { init } = await import('echarts/core')
      this.chart = init(this.chartEl.nativeElement)
      this.chart.setOption(this.getOption())
      const { onChartThemeChange } = await import('../use-chart-theme')
      this.unsubscribeTheme = onChartThemeChange(() => this.chart?.setOption(this.getOption()))
      if (typeof ResizeObserver !== 'undefined') {
        new ResizeObserver(() => this.chart?.resize()).observe(this.chartEl.nativeElement)
      }
    }
  
    ngOnChanges(changes: SimpleChanges): void {
      if (this.chart && (changes['data'] || changes['option'] || changes['names'])) {
        this.chart.setOption(this.getOption())
      }
    }
  
    ngOnDestroy(): void {
      this.unsubscribeTheme?.()
      this.unsubscribeTheme = null
      try {
        this.chart?.dispose()
      } catch {
        /* already disposed */
      }
      this.chart = null
    }
  }
  

• src/app/components/ui/charts/dumbbell-chart/index.ts0.1 kB

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• src/app/components/ui/charts/use-chart-theme.ts7.4 kB

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Raw manifest:https://uipkge.dev/r/angular/dumbbell-chart.json

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