rectsFor method

Implementation

List<Rect> rectsFor(int start, int end, {UDocTextGeometry geometry = UDocTextGeometry.auto}) {
  final int from = start.clamp(0, text.length);
  final int to = end.clamp(0, text.length);
  if (to <= from) return const <Rect>[];
  if (usesBox(geometry)) return <Rect>[rect];
  final List<Rect> pieces = <Rect>[];
  for (int i = from; i < to; i++) {
    final Rect piece = charRects[i];
    if (piece.width <= 0.01 || piece.height <= 0.01) continue;
    pieces.add(piece);
  }
  if (pieces.isEmpty) return <Rect>[rect];
  pieces.sort((Rect a, Rect b) => a.left.compareTo(b.left));
  final List<Rect> merged = <Rect>[];
  Rect current = pieces.first;
  for (int i = 1; i < pieces.length; i++) {
    final Rect next = pieces[i];
    if (next.left <= current.right + current.height * 0.6) {
      current = current.expandToInclude(next);
    } else {
      merged.add(current);
      current = next;
    }
  }
  merged.add(current);
  return merged;
}