How can I rotate a Container widget in 2D around a specified anchor point?

Question

I\'d like to perform a very simple 2D rotation of a Container widget (that contains a handful of other widgets.) This widget would be rotated around a single fixed point in the

Answer 1

For those who want to make an app like me, just using Transform and Gesturedetector. And remember don't use Draggable and Gesturedetector together because you only can drag and drop but you can't zooming widget :)).

Refer: A Deep Dive Into Transform Widgets in Flutter

barbswatanabe

:

             Transform.rotate(
                  alignment: FractionalOffset.center,
                  angle: state.listStickerModel[index].angle,
                  child: Transform(
                    alignment: FractionalOffset.center,
                    transform: new Matrix4.diagonal3(vector.Vector3(
                        state.listStickerModel[index].zoom,
                        state.listStickerModel[index].zoom,
                        state.listStickerModel[index].zoom)),
                    child: GestureDetector(
                      onScaleStart: (detail) {
                        _editPhotoBloc.add(UpdateSticker(
                          index: index,
                          offset: detail.focalPoint,
                          previousZoom: state.listStickerModel[index].zoom,
                        ));
                      },
                      onScaleUpdate: (detail) {
                        _editPhotoBloc.add(UpdateSticker(
                            index: index,
                            offset: Offset(detail.localFocalPoint.dx,
                                detail.focalPoint.dy),
                            angle: detail.rotation,
                            zoom:
                                state.listStickerModel[index].previousZoom *
                                    detail.scale));
                      },
                      child: Container(
                        alignment: Alignment.center,
                        child: SvgPicture.asset(
                            state.listStickerModel[index].src),
                      ),
                    ),
                  ),
                ),