setWatermark method
Implementation
Future<int> setWatermark(String imagePath, Point<double> position, double zoom) async {
Map<String, dynamic> arguments = {
'imagePath': imagePath,
'position': {'x': position.x, 'y': position.y},
'zoom': zoom,
};
int code = await _channel.invokeMethod('setWatermark', arguments) ?? -1;
return code;
}