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  AffineTransform#createTransformedShape(GeneralPath)  (Read 1556 times)
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Offline NVaidya

Junior Devvie




Java games rock!


« Posted 2006-05-31 18:31:25 »

Would appreciate some help with the following please:

My application which works correctly with jdk1.5.0_06 fails with the following ClassCastException with Mustang b85 (-source 1.5):
1  
java.lang.ClassCastException: java.awt.geom.Path2D$Double cannot be cast to java.awt.geom.GeneralPath


when I try to retrieve a transformed GeneralPath as follows:
1  
GeneralPath outputGeneralPath  = (GeneralPath)affineTransform.createTransformedShape( inputGeneralPath );


From a quick look at the source code for 1.5 and 1.6 for the method createTransformedShape(...), it appears that 1.5 can conditionally return a GeneralPath, while 1.6 unconditionally returns a Path2D.Double, and the exception occurs because GeneralPath extends Path2D.Float.

Am I missing anythin' obvious ?

Thanks in advance

Gravity Sucks !
Offline ryanm

Senior Devvie


Projects: 1
Exp: 15 years


Used to be bleb


« Reply #1 - Posted 2006-05-31 18:41:46 »

In trying to make the cast to a GeneralPath, you're making an unsafe assumption about the implementation of createTransformedShape(), which is liable to change at any time.

Hows about coding to the API -rather than the implementation- like so:
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GeneralPath outputGeneralPath = new GeneralPath( affineTransform.createTransformedShape( inputGeneralPath ) );
Offline trembovetski

Senior Devvie




If only I knew what I'm talking about!


« Reply #2 - Posted 2006-05-31 20:01:21 »

Bleb is correct - you shouldn't cast the return of createTransformedShape().

Here's the fix which caused the change:
   4172661: GeneralPath needs double version
   http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4172661

Thanks,
  Dmitri
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Offline NVaidya

Junior Devvie




Java games rock!


« Reply #3 - Posted 2006-06-01 22:20:47 »

Thanks for the quick help guys ! alright, I get the big picture now after reading  that Bug Fix.   
After looking at the 1.5 docs again, I think I could actually get away with clobbering the input data with an in-place transform by doing inputGeneralPath.transform( affineTransform ) since I really didn't need to keep the original data around. I'm using the GeneralPath to build a couple of hand-crafted icons to display in the ToolBar, and the application was crashing right at the start-up.

Thanks again !

Gravity Sucks !
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