nl_tokens: Converts rectangular to polar coordinates . An origin can be specified otherwise it s 0
pl_tokens: function ( o ) { o = ( o && point ( o ) ) || <mask> ( 0 , 0 ) ; var x = this . x ; var y = this . y ; this . x = sqrt ( ( x - o . x ) * ( x - o . x ) + ( y - o . y ) * ( y - o . y ) ) ; // r this . y = toRad ( o . theta ( point ( x , y ) ) ) ; return this ; }