nl_tokens: for different line drawing modes ( line / step ) per series Helper function to trace a line back along the baseline .
pl_tokens: function ( ctx , baselineX , baselineY , pathBack ) { ctx . lineTo ( baselineX , baselineY ) ; if ( stackedGraph ) { for ( var i = pathBack . length - 1 ; i >= 0 ; i -- ) { var <mask> = pathBack [ i ] ; ctx . lineTo ( pt [ 0 ] , pt [ 1 ] ) ; } } }