Trying to retrieve the x-value from a x-coordinate on a d3.js SVG graph -


i'm little stuck on something, , hoping maybe point me in correct direction solution. running searches on google isn't helping me out due wording of searches.

what i'm trying 'value' of x-position on graph. on graph, x-axis made of dates. so, if know plotted x co-ordinate point on graph 200 example, i'd date label x-position 200. there lots of tutorials , examples demonstrate how retrieve x-coordinate (200), not x-coordinate value (date object x-position 200).

what i'm going build user notes feature allows user select x-position on graph , make note @ point. i'll need store object note containing x , y value of coordinates, , since points on graph mapped , remapped applying date object .x, need date points plot on graph can recorded , re-applied, , moved if user decides move note tool around.

anyway, i'm kind of looking way reverse-engineer this...

function getdatex(x, data) {     var datex = x(data.date);     return datex; }

...but instead of, in case, getting x-coordinate position back, date based on provided x-coordinate position.

any pointers toward solution provide me appreciated. time.

var x = d3.scale.linear()           .domain([0,200])           .range([new date("2000-01-01"), new date("2001-01-01")]);  new date(x(150))  // sun oct 01 2000 21:00:00 gmt+0900 (東京 (標準時))

or, if have scale date -> number

var x = d3.time.scale()           .range([0,200])           .domain([new date("2000-01-01"), new date("2001-01-01")]);  x.invert(150)  // sun oct 01 2000 21:00:00 gmt+0900 (東京 (標準時))

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