Heikin Ashi Chart

Installation

Examples

Props

Used by

Files installed (3)

• src/app/components/ui/charts/heikin-ashi-chart/heikin-ashi-chart.component.ts6.2 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 HeikinAshiChart — OHLC averaged candle-over-candle (pure ha()). Standalone, theme-aware. Same inputs as the Vue `HeikinAshiChart` (`data`, `zoom`, `height`, `option`).
   */
  @Component({
    changeDetection: ChangeDetectionStrategy.Eager,
    selector: 'ui-heikin-ashi-chart, [ui-heikin-ashi-chart]',
    standalone: true,
    host: {
      '[attr.data-slot]': '"heikin-ashi-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 UiHeikinAshiChartComponent implements AfterViewInit, OnChanges, OnDestroy {
    /** `{ date, open, high, low, close }` per candle. */
    @Input() data: { date: string; open: number; high: number; low: number; close: number }[] = []
    /** Show the data-zoom slider. Default false. */
    @Input() zoom = false
    @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)
    }
    /** Heikin-Ashi averaging: each candle blends the previous one. Pure — unit-tested. */
    ha(): { date: string; open: number; high: number; low: number; close: number }[] {
      let prevOpen = this.data[0]?.open ?? 0
      let prevClose = this.data[0]?.close ?? 0
      return this.data.map((c) => {
        const haClose = (c.open + c.high + c.low + c.close) / 4
        const haOpen = (prevOpen + prevClose) / 2
        const haHigh = Math.max(c.high, haOpen, haClose)
        const haLow = Math.min(c.low, haOpen, haClose)
        prevOpen = haOpen
        prevClose = haClose
        return {
          date: c.date,
          open: +haOpen.toFixed(2),
          close: +haClose.toFixed(2),
          low: +haLow.toFixed(2),
          high: +haHigh.toFixed(2),
        }
      })
    }
  
    /** Build the merged ECharts option (pure — no DOM needed, unit-testable). */
    getOption(): Record<string, unknown> {
      const colors = getChartColors()
      const rows = this.ha()
      const series = [
        {
          type: 'candlestick',
          data: rows.map((c) => [c.open, c.close, c.low, c.high]),
          itemStyle: { color: colors[1], color0: colors[3], borderColor: colors[1], borderColor0: colors[3] },
        },
      ]
      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
      return {
        color: colors,
        grid: mergeOptionBlock(
          {
            left: 16,
            right: 16,
            top: 24,
            bottom: this.zoom ? 56 : 24,
            outerBoundsMode: 'same',
            outerBoundsContain: 'axisLabel',
          },
          userGrid,
        ),
        tooltip: mergeOptionBlock(
          {
            trigger: 'axis',
            axisPointer: { type: 'cross' },
            backgroundColor: getChartTooltipBg(),
            borderColor: getChartTooltipBorder(),
            textStyle: { color: getChartTooltipText(), fontSize: 12 },
          },
          userTooltip,
        ),
        xAxis: mergeOptionBlock(
          {
            type: 'category',
            data: rows.map((c) => c.date),
            scale: true,
            axisLine: { lineStyle: { color: getChartAxisColor() } },
            axisLabel: { color: getChartTextColor(), fontSize: 11 },
            axisTick: { show: false },
          },
          userXAxis,
        ),
        yAxis: mergeOptionBlock(
          {
            type: 'value',
            scale: true,
            splitLine: { lineStyle: { color: getChartSplitLineColor() } },
            axisLabel: { color: getChartTextColor(), fontSize: 11 },
          },
          userYAxis,
        ),
        dataZoom: this.zoom ? [{ type: 'inside' }, { type: 'slider' }] : undefined,
        series: mergedSeries,
        ...userRest,
      }
    }
  
    async ngAfterViewInit(): Promise<void> {
      if (typeof window === 'undefined' || !this.chartEl?.nativeElement) return
      const [{ use }, { CanvasRenderer }, { CandlestickChart: EChartsCandlestickChart }, comps] = await Promise.all([
        import('echarts/core'),
        import('echarts/renderers'),
        import('echarts/charts'),
        import('echarts/components'),
      ])
      use([CanvasRenderer, EChartsCandlestickChart, comps.GridComponent, comps.TooltipComponent, comps.DataZoomComponent])
      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['zoom'])) {
        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/heikin-ashi-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/heikin-ashi-chart.json

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