drawLine method
Implementation
@override
Future<int?> drawLine(int x0, int y0, int x1, int y1, int lineWidth) async {
Map<String, dynamic> param = <String, dynamic>{};
param['x0'] = x0;
param['y0'] = y0;
param['x1'] = x1;
param['y1'] = y1;
param['lineWidth'] = lineWidth;
return await methodChannel.invokeMethod<int>('drawLine', param);
}