renderItem method

@override List<Figure> renderItem(Aes item, CoordConv coord, Offset origin)

Renders a single tuple if called by renderGroup.

Implementation

@override
List<Figure> renderItem(
  Aes item,
  CoordConv coord,
  Offset origin,
) {
  assert(item.shape is CandlestickShape);

  final path = Path();

  // Candle stick shape dosen't allow NaN value.
  final points = item.position.map((p) => coord.convert(p)).toList();
  final x = points.first.dx;
  final ys = points.map((p) => p.dy).toList()..sort();
  final bias = (item.size ?? defaultSize) / 2;
  final top = ys[0];
  final topEdge = ys[1];
  final bottomEdge = ys[2];
  final bottom = ys[3];

  if (hollow) {
    path.moveTo(x, top);
    path.lineTo(x, topEdge);
    path.moveTo(x, bottomEdge);
    path.lineTo(x, bottom);
  } else {
    // If the stoke style is fill, the lines created by Path.lineTo will not
    // be rendered.
    final strokeBias = strokeWidth / 2;
    path.addRect(Rect.fromPoints(
      Offset(x - strokeBias, top),
      Offset(x + strokeBias, topEdge),
    ));
    path.addRect(Rect.fromPoints(
      Offset(x - strokeBias, bottomEdge),
      Offset(x + strokeBias, bottom),
    ));
  }

  path.addRect(Rect.fromPoints(
    Offset(x - bias, topEdge),
    Offset(x + bias, bottomEdge),
  ));

  // Color variation should be controled by color attribute.
  return renderBasicItem(
    path,
    item,
    hollow,
    strokeWidth,
  );

  // No labels.
}