Pareto Chart

Installation

Examples

Props

Used by

Files installed (3)

• src/app/components/ui/charts/pareto-chart/pareto-chart.component.ts6.6 kB

  Copy

  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 ParetoChart — sorted bars with an auto-computed cumulative % line. Standalone, theme-aware. Same inputs as the Vue `ParetoChart` (`data`, `height`, `option`).
   */
  @Component({
    changeDetection: ChangeDetectionStrategy.Eager,
    selector: 'ui-pareto-chart, [ui-pareto-chart]',
    standalone: true,
    host: {
      '[attr.data-slot]': '"pareto-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 UiParetoChartComponent implements AfterViewInit, OnChanges, OnDestroy {
    /** `{ category, value }` per cause. Sorted descending in getOption. */
    @Input() data: { category: string; value: number }[] = []
    @Input() height: number | string = 320
    @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)
    }
    /** Descending rows with running cumulative percent. Pure — unit-tested. */
    ranked(): { category: string; value: number; cumPct: number }[] {
      const rows = [...this.data].sort((a, b) => b.value - a.value)
      const total = rows.reduce((s, r) => s + r.value, 0) || 1
      let acc = 0
      return rows.map((r) => {
        acc += r.value
        return { ...r, cumPct: +((acc / total) * 100).toFixed(1) }
      })
    }
  
    /** Build the merged ECharts option (pure — no DOM needed, unit-testable). */
    getOption(): Record<string, unknown> {
      const colors = getChartColors()
      const rows = this.ranked()
      const series = [
        {
          name: 'value',
          type: 'bar',
          yAxisIndex: 0,
          barMaxWidth: 30,
          itemStyle: { color: colors[0], borderRadius: [6, 6, 6, 6] },
          data: rows.map((r) => r.value),
        },
        {
          name: 'cumulative %',
          type: 'line',
          yAxisIndex: 1,
          smooth: true,
          symbol: 'circle',
          symbolSize: 7,
          lineStyle: { width: 2, color: colors[3] },
          itemStyle: { color: colors[3] },
          data: rows.map((r) => r.cumPct),
        },
      ]
      const userOption: Record<string, any> = this.option ?? {}
      const {
        series: userSeries,
        xAxis: userXAxis,
        yAxis: userYAxis,
        grid: userGrid,
        tooltip: userTooltip,
        legend: userLegend,
        ...userRest
      } = userOption
      const mergedSeries = Array.isArray(userSeries) ? series.map((s, i) => ({ ...s, ...(userSeries[i] ?? {}) })) : series
      return {
        color: colors,
        grid: mergeOptionBlock(
          { left: 16, right: 16, top: 24, bottom: 32, outerBoundsMode: 'same', outerBoundsContain: 'axisLabel' },
          userGrid,
        ),
        tooltip: mergeOptionBlock(
          {
            trigger: 'axis',
            backgroundColor: getChartTooltipBg(),
            borderColor: getChartTooltipBorder(),
            textStyle: { color: getChartTooltipText(), fontSize: 12 },
          },
          userTooltip,
        ),
        legend: mergeOptionBlock(
          {
            bottom: 0,
            icon: 'circle',
            itemWidth: 8,
            itemHeight: 8,
            textStyle: { fontSize: 11, color: getChartTextColor() },
          },
          userLegend,
        ),
        xAxis: mergeOptionBlock(
          {
            type: 'category',
            data: rows.map((r) => r.category),
            axisLine: { lineStyle: { color: getChartAxisColor() } },
            axisLabel: { color: getChartTextColor(), fontSize: 11, rotate: 20 },
            axisTick: { show: false },
          },
          userXAxis,
        ),
        yAxis: Array.isArray(userYAxis)
          ? userYAxis
          : [
              mergeOptionBlock(
                {
                  type: 'value',
                  splitLine: { lineStyle: { color: getChartSplitLineColor() } },
                  axisLabel: { color: getChartTextColor(), fontSize: 11 },
                },
                (userYAxis as any)?.[0],
              ),
              mergeOptionBlock(
                {
                  type: 'value',
                  max: 100,
                  splitLine: { show: false },
                  axisLabel: { color: getChartTextColor(), fontSize: 11, formatter: '{value}%' },
                },
                (userYAxis as any)?.[1],
              ),
            ],
        series: mergedSeries,
        ...userRest,
      }
    }
  
    async ngAfterViewInit(): Promise<void> {
      if (typeof window === 'undefined' || !this.chartEl?.nativeElement) return
      const [{ use }, { CanvasRenderer }, { BarChart: EChartsBarChart, LineChart: EChartsLineChart }, comps] =
        await Promise.all([
          import('echarts/core'),
          import('echarts/renderers'),
          import('echarts/charts'),
          import('echarts/components'),
        ])
      use([CanvasRenderer, EChartsBarChart, EChartsLineChart, 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'])) {
        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/pareto-chart/index.ts0.1 kB

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

  Copy

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

Related components