Function extractLegendInfo

apps/sim/lib/pptx-renderer/renderer/chart-renderer.ts:792–841

* Extract legend position from chartSpace > chart > legend > legendPos.

(chartNode: SafeXmlNode, ctx: RenderContext)

 * Extract legend position from chartSpace > chart > legend > legendPos.
 */
function extractLegendInfo(chartNode: SafeXmlNode, ctx: RenderContext): LegendInfo | undefined {
  const legend = chartNode.child('legend')
  if (!legend.exists()) return undefined

  const legendPos = legend.child('legendPos')
  // OOXML default legend position is 'r' (right) per the spec, not 'b'
  const posVal = legendPos.exists() ? legendPos.attr('val') || 'r' : 'r'

  const overlay = legend.child('overlay').attr('val') === '1'

  // Map OOXML positions to ECharts; keep legend inside and below chart title (avoid overlap on slide 4, 6, etc.)
  const base = { confine: true as const }
  const topBelowTitle = '14%' // leave room for chart title so legend does not overlap
  let option: echarts.EChartsOption['legend']
  switch (posVal) {
    case 'b':
      option = { ...base, bottom: '5%', orient: 'horizontal' as const }
      break
    case 't':
      option = { ...base, top: topBelowTitle, orient: 'horizontal' as const }
      break
    case 'l':
      option = { ...base, left: '2%', top: '44%', orient: 'vertical' as const }
      break
    case 'r':
      option = { ...base, right: '2%', top: '44%', orient: 'vertical' as const }
      break
    case 'tr':
      option = { ...base, top: topBelowTitle, right: '2%', orient: 'vertical' as const }
      break
    default:
      option = { ...base, right: '2%', top: '44%', orient: 'vertical' as const }
      break
  }
  return {
    option,
    overlay,
    textStyle: (() => {
      const s = extractTxPrStyle(legend, ctx)
      if (!s) return undefined
      return {
        ...(s.color ? { color: s.color } : {}),
        ...(s.fontSize !== undefined ? { fontSize: s.fontSize } : {}),
        ...(s.bold === true ? { fontWeight: 'bold' } : {}),
        ...(s.fontFamily ? { fontFamily: s.fontFamily } : {}),
      }
    })(),
    manualLayout: extractLegendManualLayout(legend),
  }
}

/**
 * Parse legend/layout/manualLayout to ECharts legend position/size override.