Line Chart

Installation

Examples

Props

Used by

Files installed (3)

• src/app/components/ui/charts/line-chart/line-chart.component.ts6.9 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 {
    getChartAxisColor,
    getChartColors,
    getChartSplitLineColor,
    getChartTextColor,
    getChartTooltipBg,
    getChartTooltipBorder,
    getChartTooltipText,
    mergeOptionBlock,
  } from '../use-chart-theme'
  
  export type LineCurve = 'smooth' | 'linear' | 'step' | 'stepStart' | 'stepEnd'
  
  /**
   * Angular port of the UIPKGE LineChart — ECharts wrapper with smooth/stepped/
   * dashed lines, multi-series, and point markers. Standalone, theme-aware via
   * registry tokens. Same inputs as the Vue `LineChart` (`data`, `xField`,
   * `yField`, `curve`, `stacked`, `markers`, `dashed`, `height`, `option`).
   */
  @Component({
    changeDetection: ChangeDetectionStrategy.Eager,
    selector: 'ui-line-chart, [ui-line-chart]',
    standalone: true,
    host: {
      '[attr.data-slot]': '"line-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 UiLineChartComponent implements AfterViewInit, OnChanges, OnDestroy {
    @Input() data: Record<string, unknown>[] = []
    @Input() xField = 'x'
    @Input() yField: string | string[] = 'y'
    /** Line interpolation. Default 'smooth'. */
    @Input() curve: LineCurve = 'smooth'
    /** Stack series cumulatively. Default false. */
    @Input() stacked = false
    /** Show point markers. Default true. */
    @Input() markers = true
    /** Dashed stroke on all series (forecast look). Default false. */
    @Input() dashed = false
    @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)
    }
  
    fields(): string[] {
      return Array.isArray(this.yField) ? this.yField : [this.yField]
    }
  
    /** Build the merged ECharts option (pure — no DOM needed, unit-testable). */
    getOption(): Record<string, unknown> {
      const fields = this.fields()
      const colors = getChartColors()
      const xData = this.data.map((d) => d[this.xField])
  
      const series = fields.map((field, i) => ({
        name: field,
        type: 'line',
        smooth: this.curve === 'smooth',
        step:
          this.curve === 'step'
            ? 'middle'
            : this.curve === 'stepStart'
              ? 'start'
              : this.curve === 'stepEnd'
                ? 'end'
                : false,
        stack: this.stacked ? 'lines' : undefined,
        symbol: this.markers ? 'circle' : 'none',
        symbolSize: 6,
        lineStyle: { width: 2, type: this.dashed ? 'dashed' : 'solid' },
        itemStyle: { color: colors[i % colors.length] },
        data: this.data.map((d) => d[field]),
      }))
  
      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
  
      const baseLegend =
        fields.length > 1
          ? {
              bottom: 0,
              icon: 'circle',
              itemWidth: 8,
              itemHeight: 8,
              textStyle: { fontSize: 11, color: getChartTextColor() },
            }
          : undefined
  
      return {
        color: colors,
        grid: mergeOptionBlock(
          {
            left: 16,
            right: 16,
            top: 24,
            bottom: fields.length > 1 ? 32 : 24,
            outerBoundsMode: 'same',
            outerBoundsContain: 'axisLabel',
          },
          userGrid,
        ),
        tooltip: mergeOptionBlock(
          {
            trigger: 'axis',
            backgroundColor: getChartTooltipBg(),
            borderColor: getChartTooltipBorder(),
            textStyle: { color: getChartTooltipText(), fontSize: 12 },
          },
          userTooltip,
        ),
        legend: userLegend?.show === false ? undefined : mergeOptionBlock(baseLegend ?? {}, userLegend),
        xAxis: mergeOptionBlock(
          {
            type: 'category',
            data: xData,
            axisLine: { lineStyle: { color: getChartAxisColor() } },
            axisLabel: { color: getChartTextColor(), fontSize: 11 },
            axisTick: { show: false },
          },
          userXAxis,
        ),
        yAxis: mergeOptionBlock(
          {
            type: 'value',
            splitLine: { lineStyle: { color: getChartSplitLineColor() } },
            axisLabel: { color: getChartTextColor(), fontSize: 11 },
            axisLine: { show: false },
            axisTick: { show: false },
          },
          userYAxis,
        ),
        series: mergedSeries,
        ...userRest,
      }
    }
  
    async ngAfterViewInit(): Promise<void> {
      if (typeof window === 'undefined' || !this.chartEl?.nativeElement) return
      const [{ use }, { CanvasRenderer }, { LineChart }, comps] = await Promise.all([
        import('echarts/core'),
        import('echarts/renderers'),
        import('echarts/charts'),
        import('echarts/components'),
      ])
      use([
        CanvasRenderer,
        LineChart,
        comps.GridComponent,
        comps.TooltipComponent,
        comps.LegendComponent,
        comps.MarkPointComponent,
        comps.MarkLineComponent,
        comps.MarkAreaComponent,
      ])
      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['curve'] ||
          changes['stacked'] ||
          changes['markers'] ||
          changes['dashed'])
      ) {
        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/line-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/line-chart.json

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