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

Per Ian's advice, I gave the following a try. It appears to work, at least in my limited testing.

The container is nested within a Transform widget. Using alignment allows one to adjust the transform-origin in relative terms, i.e., in the center, the top left, etc.

var container = new Container (
  child: new Stack (
    children: [
      new Image.asset ( // background photo
        "assets/texture.jpg",
        fit: ImageFit.cover,
      ),
      new Center (
        child: new Transform (
          child: new Container (
            child: new Text (
              "Lorem ipsum",
              style: new TextStyle(
                color: Colors.white,
                fontSize: 42.0,
                fontWeight: FontWeight.w900,
              )
            ),
            decoration: new BoxDecoration (
              backgroundColor: Colors.black,
            ),
            padding: new EdgeInsets.fromLTRB(16.0, 16.0, 16.0, 16.0),              
          ),
          alignment: FractionalOffset.center, // set transform origin
          transform: new Matrix4.rotationZ(0.174533), // rotate -10 deg
        ),
      ),
    ],
  ),
  width: 400.0,
  height: 200.0,
);