How to get the world coordinates of a point in a child actor?
coordinates, libgdx, scene2d
Solution
You can either use `Actor.localToParentCoordinates()` if you want to go just one step higher in your hierarchy of `Groups` and `Actors`, or directly use `Actor.localToStageCoordinates()` to get the "stage-global" coordinates directly. In this case, libGDX will recursively apply the `localToParentCoordinates` until it hits the root element of your stage.
Problem
I have `Group` objects that consist of other `Group` objects, that finally consist of `Actor` objects. Now, when the groups and actors are rotated, offset and scaled, the coordinates in the "world", or in relation to the root node change. How do I get the world coordinates of a point in an actor's local space? To illustrate a bit more, here's an example of what I want: ``` Group parentGroup; Actor childInGroup; ... parentGroup.addActor(childInGroup); childInGroup.setPosition(10f, 15f); childInGroup.setRotation(45f); // Get the childInGroup's position in the world float childWorldPosX = ...; // This is what I want to know float childWorldPosY = ...; // ... and this. ```