final int w = getWidth();
Rectangle cr;
int y;
info = dt.getBestSubsample( new Span( viewSpan.start, viewSpan.stop + 1 ), w );
dt.drawWaveform( info, this, g2 );
if( nullLinie ) {
g2.setPaint( pntNull );
g2.setStroke( strkNull );
for( int ch = 0; ch < fullChannels; ch++ ) {