1 function d3_scale_nice(domain, nice) {

     2   var i0 = 0,

     3       i1 = domain.length - 1,

     4       x0 = domain[i0],

     5       x1 = domain[i1],

     6       dx;

     7 

     8   if (x1 < x0) {

     9     dx = i0; i0 = i1; i1 = dx;

    10     dx = x0; x0 = x1; x1 = dx;

    11   }

    12 

    13   if (dx = x1 - x0) {

    14     nice = nice(dx);

    15     domain[i0] = nice.floor(x0);

    16     domain[i1] = nice.ceil(x1);

    17   }

    18 

    19   return domain;

    20 }

    21 

    22 function d3_scale_niceDefault() {

    23   return Math;

    24 }