anchor.diff:    void _applyTransforms() {
       // Apply the transforms only once. This allows for multiple render calls but
       // a single transforms application phase.
  -    if (transformsApplied == false)
  -      return;
  +    if (transformsApplied == false) return;
       transformsApplied = true;
       // Go through data transforms first and apply them to every point.
       for (DataTransformFunction transform in _dataTransforms) {
  
positive.code: part of many_points;
  
  class Visualisation {
    final String _imagePrefix = 'output/image/';
  
    List<DataTransformFunction> _dataTransforms = [];
    ColorTransformFunction _colorTransform;
  
negative.code:     if (width != -1) {
        image = copyResize(image, width, height, NEAREST);
      }
      String filename = _outputFolder;
      if (_outputFilename == null) {
        filename = filename + new DateTime.now().toString() + '.png';
      } else {
        filename = filename + _outputFilename;
      }
      new io.File(filename).create(recursive: true).then((io.File file) {
        file.writeAsBytesSync(encodePng(image));
      });
    }
  