cropImage function

Future<File> cropImage (File imageFile)

Crops and compresses an image, as File. It is used to compress the profile pictures.

Implementation 

Future<File> cropImage(File imageFile) async {
  print("cropping image"); //todo: remove debug print
  final tempDir = await getTemporaryDirectory();
  final path = tempDir.path;
  int rand = new Random().nextInt(10000);
  int proPicDimension = 200; //here is defined the size width of the profile pictures

  Im.Image image = Im.decodeImage(imageFile.readAsBytesSync());
  image = _imageSquarer(image);
  image = Im.copyResize(image, proPicDimension);
  print("image cropped");
  imageFile = new File('$path/img_$rand.jpg')
    ..writeAsBytesSync(Im.encodeJpg(image, quality: 75));
  return imageFile;
}