selectionUnionBounds function

Rect2D? selectionUnionBounds(Iterable<ElementId> ids, { required Rect2D? getBounds(ElementId id), })

Axis-aligned union of the provided ids' bounds.

getBounds should return world-space AABBs for individual elements. In runtime/editor, getBounds is typically backed by ComputedScene.visualBoundsWorldById (computed once in the compute stage).

Returns null when there are no ids or no available bounds.

Implementation

Rect2D? selectionUnionBounds(
  Iterable<ElementId> ids, {
  required Rect2D? Function(ElementId id) getBounds,
}) {
  Rect2D? acc;
  for (final id in ids) {
    final b = getBounds(id);
    if (b == null) continue;
    acc = (acc == null) ? b : Rect2DX.union(acc, b);
  }
  return acc;
}