LocalToScene Transformation (related to Affine Transforms)

Kevin Rushforth kevin.rushforth at oracle.com
Fri May 11 07:19:04 PDT 2012

I'm not sure that the existing Transform class should ever support 
non-affine matrices. Perhaps it would be better to provide a different 
base class for that.

-- Kevin

Martin Desruisseaux wrote:
> Hello Pavel
> Right, I was not expecting the scene graph to support such general 
> transform. To make my long email short, I was just pointing that 
> adding 'getScaleX()', 'getScaleY()' and similar methods in the 
> 'Transform' class effectively restrict the Transform class to the 
> Affine case, in which case the current class names become problematic. 
> Using a 'getMatrix' method (we could find a better name) with a 
> 'Point3d' argument would solve the conceptual problem, without 
> obligation for JavaFX to support such general transforms - that would 
> be left to users (I would be fine with JavaFX throwing an exception if 
> given a unrecognized transform).
> The intend was just to avoid a class naming problem while keeping the 
> current class hierarchy, and keeping door open for non-linear 
> transforms in the future.
>     Regards,
>         Martin
> Le 11/05/12 11:09, Pavel Safrata a écrit :
>> Hello Martin,
>> your comments make perfect sense. However, I seriously doubt our 
>> scene graph would ever be able to operate with such general 
>> transformations. Apart from the fact that we would most probably have 
>> a great trouble to implement all the existing functionality if such 
>> transformations were allowed, it would bring a serious performance 
>> drop and would create an API considerably less handy for the usual 
>> cases. Anyway, if we decide that the naming issue is serious and/or 
>> that we want to leave the door open to the generic transforms, we can 
>> do following: insert a new class (say AffineBase) as a subclass of 
>> Transform and superclass of all the existing transforms, then go with 
>> our proposed solution using AffineBase instead of Transform. To me it 
>> seems as a good thing to do.

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