final int w = getWidth();
// Rectangle cr;
// int y;
info = dt.getBestSubsample( new Span( viewSpan.start, viewSpan.stop + 1 ), w );
dt.drawWaveform( info, this, g2 );
// XXX
// if( nullLinie ) {
// g2.setPaint( pntNull );
// g2.setStroke( strkNull );