Absolute screen position of child object?

Biggerplay

Is there a way to get the absolute screen position of a child sprite/image?

Daniel

You can easily get the coordinates in stage coordinates (which are basically the screen coordinates) — or, in fact, the coordinates within any coordinate system you want:

// get bounds of object "_quad" on the stage:
SPRectangle *stageBounds = [_quad boundsInSpace:self.stage];
NSLog(@"stagebounds: %@", stageBounds);

TTStu

Daniel, what about the SPDisplayObject localToGlobal...

Working with SPPoint, if you ONLY want to translate a single point (position) to the absolute screen, would localToGlobal not provide a performance benefit over boundsInSpace?

Daniel

Indeed, localToGlobal will be slightly faster! It's the preferred way if you just need to transform one single point.

That said: the majority of the time is spent in calculating the (internally used) transformation matrix between the two coordinate spaces. So the difference is probably hard to measure at all.