javascript - d3 getting invert value of Band Scales -

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i writing gantt chart using d3

i have xscale time scale(time)

this.xscale = d3.scaletime()             .domain([this.startdate,this.enddate])             .range([0,this.getwidth()]);

and yscale band scale (resources)

this.yscale = d3.scaleband()         .domain(resources.map(function(res){             return res.res_num;         }))         .rangeround([0,this.getheight()])         .paddinginner(.3)

problem need drag , drop task( svg rect) 1 resource resources

when drag using transfrom moving on svg

_ondrag : function(d)     {         var x = d3.event.dx+d3.event.x;         var y = d3.event.dy+d3.event.y;         d3.select(this).raise().attr("transform","translate(" + [x,y] + ")");     },

but on drop have handle logic below:

  1. the rect should not in between resources, need transform band based on d3.event.y
    1. in xaxis time scale has invert yscale not have this. how this?

solved below don't know standard way, if other way please answer this.

var eachband = self.yscale.step(); var index = math.round((d3.event.y / eachband)); var val = self.yscale.domain()[index];

eachband gives size of band in pixels if divide y value (drag event) eachband index gives yscale value


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