Yusuke, do you mind adding your jp.sourceforge.qrcode.example.QRCodeDecoderSampleGUI class to the CVS repository so that I can understand what's hapening here ?
RE: Where is getCanvas() ? (2006-04-19 10:20 by yanbe #21363)
Oops, I had to explain that operation in CVS comment.
I removed QRCodeDecoder.getCanvas() with other some out of dated methods.
I applied Singleton pattern to DebugCanvas.
And now you can get canvas with following code code anywhare:
DebugCanvas canvas = DebugCanvas.getCanvas();
Although I think this is better way than before, please tell me when you got some problems.