collate method Null safety

Future<Image> collate(
  1. int cellsPerRow

Returns an result image by putting all frames together in a table.

This method returns a table of captured frames, cellsPerRow images per row, from left to right, top to bottom.

An example of using this method can be found at AnimationSheetBuilder.


Future<ui.Image> collate(int cellsPerRow) async {
  final List<ui.Image> frames = await _frames;
    'No frames are collected. Have you forgot to set `recording` to true?');
  return _collateFrames(frames, frameSize, cellsPerRow);