# All files / components LineLayer.tsx

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     import React, {FunctionComponent, RefObject, useMemo} from 'react'

    import {LayerProps, LineLayerSpec, LineLayerConfig} from '../types'
    import {LineHoverLayer} from './LineHoverLayer'
    import {simplifyLineData} from '../utils/lineData'
    import {useCanvas} from '../utils/useCanvas'
    import {drawLines} from '../utils/drawLines'
    import {useHoverPointIndices} from '../utils/useHoverPointIndices'
    import {FILL} from '../constants/columnKeys'

    export interface Props extends LayerProps {
      spec: LineLayerSpec
      config: LineLayerConfig
      canvasRef: RefObject<HTMLCanvasElement>
    }

    export const LineLayer: FunctionComponent<Props> = props => {
      const {
        config,
        spec,
        height,
        width,
        xScale,
        yScale,
        hoverX,
        hoverY,
        legendHide,
        canvasRef,
      } = props
      const {position} = config

      const simplifiedLineData = useMemo(
        () => simplifyLineData(spec.lineData, xScale, yScale),
        [spec.lineData, xScale, yScale]
      )

      const drawLinesOptions = {
        lineData: simplifiedLineData,
        interpolation: config.interpolation,
        lineWidth: config.lineWidth,
        shadeBelow: config.shadeBelow,
        shadeBelowOpacity: config.shadeBelowOpacity,
        shadeAboveY: height,
      }

      Iif (config.colorMapping && config.colorMappingCallback) {
        config.colorMappingCallback(config.colorMapping)
      }

      useCanvas(
        canvasRef,
        width,
        height,
        context => drawLines({context, ...drawLinesOptions}),
        Object.values(drawLinesOptions)
      )

      let hoverDimension: 'x' | 'y' | 'xy'

      if (config.hoverDimension === 'auto') {
        hoverDimension = 'x'
        Iif (Object.keys(spec.lineData).length > config.maxTooltipRows) {
          hoverDimension = 'xy'
        }
      } else {
        hoverDimension = config.hoverDimension
      }

      const hoverYColumnData =
        position === 'stacked'
          ? spec.stackedDomainValueColumn
          : spec.table.getColumn(config.y, 'number')
      const hoverRowIndices = useHoverPointIndices(
        hoverDimension,
        hoverX,
        hoverY,
        spec.table.getColumn(config.x, 'number'),
        hoverYColumnData,
        spec.table.getColumn(FILL, 'number'),
        xScale,
        yScale,
        width,
        height
      )

      const hasHoverData =
        hoverRowIndices && hoverRowIndices.length > 0 && !legendHide

      return (
        <>
          <canvas
            className="giraffe-layer giraffe-layer-line"
            ref={canvasRef}
            style={{
              position: 'absolute',
              opacity: hoverDimension === 'xy' && hasHoverData ? 0.4 : 1,
            }}
            data-testid="giraffe-layer-line"
          />
          {hasHoverData && (
            <LineHoverLayer
              {...props}
              rowIndices={hoverRowIndices}
              dimension={hoverDimension}
              simplifiedLineData={simplifiedLineData}
            />
          )}
        </>
      )
    }

    LineLayer.displayName = 'LineLayer'