rowLayout function

VenueLayoutDocument rowLayout({ int rows = 5, int seatsPerRow = 8, int blocks = 1, double aisle = 80, double spacing = 56, double rowSpacing = 64, double x = 100, double y = 100, double arc = 0, String? id, TableSeating seating = const TableSeating(), })

Implementation

VenueLayoutDocument rowLayout({
  int rows = 5,
  int seatsPerRow = 8,
  int blocks = 1,
  double aisle = 80,
  double spacing = 56,
  double rowSpacing = 64,
  double x = 100,
  double y = 100,
  double arc = 0,
  String? id,
  TableSeating seating = const TableSeating(),
}) {
  if (rows < 1 ||
      seatsPerRow < 1 ||
      blocks < 1 ||
      rows * seatsPerRow * blocks > 20000) {
    throw ArgumentError('Invalid row count');
  }
  if (!spacing.isFinite ||
      spacing <= 0 ||
      !rowSpacing.isFinite ||
      rowSpacing <= 0 ||
      !aisle.isFinite ||
      aisle < 0 ||
      !arc.isFinite ||
      !x.isFinite ||
      !y.isFinite) {
    throw ArgumentError('Invalid row geometry');
  }
  final root = id ?? newLayoutId(),
      parameters = <String, dynamic>{
        'rows': rows,
        'seatsPerRow': seatsPerRow,
        'blocks': blocks,
        'aisle': aisle,
        'spacing': spacing,
        'rowSpacing': rowSpacing,
        'arc': arc,
      };
  final nodes = <LayoutNode>[
    LayoutNode(
      id: root,
      kind: 'group',
      x: x,
      y: y,
      properties: const {},
      assembly: {'kind': 'rows', ...parameters},
      seating: seating.record,
    ),
    for (var r = 0; r < rows; r++)
      for (var b = 0; b < blocks; b++)
        for (var i = 0; i < seatsPerRow; i++)
          LayoutNode(
            id: newLayoutId(),
            kind: 'seat',
            width: seating.width,
            height: seating.height,
            parentId: root,
            x: b * (seatsPerRow * spacing + aisle) + i * spacing,
            y: r * rowSpacing + arc * pow(i - (seatsPerRow - 1) / 2, 2),
            rotation:
                atan(2 * arc * (i - (seatsPerRow - 1) / 2) / spacing) *
                180 /
                pi,
            label: _rowSeatLabel(r, b * seatsPerRow + i),
            properties: {'slot': '$r:$b:$i'},
          ),
  ];
  return VenueLayoutDocument(
    schemaVersion: 2,
    nodes: nodes,
    seatingDefaults: seating.record,
    attachments: [
      for (final node in nodes.where((node) => node.kind == 'seat'))
        {
          'seatId': node.id,
          'targetId': root,
          'rotationMode': 'auto',
          'placement': {'mode': 'automatic'},
        },
    ],
  );
}