[JAVA3D] J3DGraphics2D: calling drawString with empty string

[Sean Sylvis]

I am developing on a Win2000 system using a 32mb ATI Radeon and the Java3D 1.3beta1 
OpenGL implementation.

My application extends a Canvas3D object, which has been placed in a JPanel, which is 
in a JFrame. In my Canvas3D class, I have subclassed the postRender() method as 
follows:

public void postRender()
{
        J3DGraphics2D vGraphics = super.getGraphics2D();

        vGraphics.setFont(new Font("sans-serif", Font.PLAIN, 16));
        vGraphics.setPaint(mColor);
        
        vGraphics.drawString(mText, 50, 50);
        
        vGraphics.flush(false);
}

On occasion, the variable 'mText' is set to an empty string (""), so that nothing is 
drawn. When this happens, the following exception is thrown:

Exception occurred during Canvas3D callback:
java.lang.IllegalArgumentException: Zero length string passed to TextLayout 
constructor.
        at java.awt.font.TextLayout.<init>(Unknown Source)
        at javax.media.j3d.J3DGraphics2DImpl.drawString(J3DGraphics2DImpl.java:676)
        at javax.media.j3d.J3DGraphics2DImpl.drawString(J3DGraphics2DImpl.java:689)
        at CaptureCanvas3d.postRender(CaptureCanvas3d.java:136)
        at javax.media.j3d.Renderer.doWork(Renderer.java:1219)
        at javax.media.j3d.J3dThread.run(J3dThread.java:256)

An exception is not thrown when this code is used in a normal, Graphics2D context in a 
Swing application without a Canvas3D. Is this just a change in implementation that has 
not been documented or a bug?

Thanks for any insight,

Sean

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