drawSubPane method

void drawSubPane({ required Canvas canvas, required Rect bounds, required IndicatorResult indicator, required VisibleIndices visible, required CoordinateConverter converter, PriceRange? priceRange, double candleWidth = 8.0, })

Draws sub-pane indicators (e.g. RSI, MACD) inside the dedicated sub-pane bounds.

Implementation

void drawSubPane({
  required Canvas canvas,
  required Rect bounds,
  required IndicatorResult indicator,
  required VisibleIndices visible,
  required CoordinateConverter converter,
  PriceRange? priceRange,
  double candleWidth = 8.0,
}) {
  final range = priceRange ??
      PriceRange(indicator.fixedMin ?? 0.0, indicator.fixedMax ?? 100.0);

  // Draw horizontal reference levels (e.g. 30, 50, 70 for RSI or 0.0 for MACD)
  if (indicator.horizontalLevels != null) {
    final levelPaint = Paint()
      ..color = theme.gridColor.withValues(alpha: 0.8)
      ..strokeWidth = 0.8
      ..style = PaintingStyle.stroke;

    for (final level in indicator.horizontalLevels!) {
      final y = CoordinateConverter.priceToY(level, bounds, range);
      if (y >= bounds.top && y <= bounds.bottom) {
        canvas.drawLine(
          Offset(bounds.left, y),
          Offset(bounds.right, y),
          levelPaint,
        );
      }
    }
  }

  // Draw histogram series first (if any) so line series render on top
  for (final s in indicator.series) {
    if (s.id == 'histogram') {
      _drawHistogramBars(
        canvas: canvas,
        bounds: bounds,
        series: s,
        visible: visible,
        priceRange: range,
        converter: converter,
        candleWidth: candleWidth,
      );
    }
  }

  // Draw line series
  for (final s in indicator.series) {
    if (s.id == 'histogram') continue;
    _drawSeriesLine(
      canvas: canvas,
      bounds: bounds,
      series: s,
      visible: visible,
      priceRange: range,
      converter: converter,
    );
  }
}