[piccolo2d-dev] Transparent PCanvas

[Sam Reid]

I'd like to make it possible to make PCanvas partly transparent, but
that's impossible with current implementation of PCanvas.  Line 605
gives:

  g2.setColor( getBackground() );
  g2.fillRect( 0, 0, getWidth(), getHeight() );

I'd recommend changing this to:

        if ( isOpaque() ) {
            g2.setColor( getBackground() );
            g2.fillRect( 0, 0, getWidth(), getHeight() );
        }

This is similar to the swing ui implementation.

I couldn't find a workaround that involved using a Color with a
transparent alpha channel, see discussions here:
http://www.chka.de/swing/components/opacity.html

Any comments, questions or objections to this change?

Sam Reid
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