D3 堆栈图表中第一个柱之前不需要的白色 space

Question

我正在尝试将数据集填充到 D3 的条形图数据中。我正在使用 d3 中的这个示例： https://bl.ocks.org/mbostock/1134768

 var causes = ["wounds", "other", "disease"];

var parseDate = d3.time.format("%m/%Y").parse;

var margin = {top: 20, right: 50, bottom: 30, left: 40},
        width = 960 - margin.left - margin.right,
        height = 500 - margin.top - margin.bottom;

var svg = d3.select("body").append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
        .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.tsv("data.csv",  function(error, crimea) {
    if (error) throw error;
    var layers = d3.layout.stack()(causes.map(function(c) {
        return crimea.map(function(d) {
            return {x: parseDate(d.date), y: +d[c]};
        });
    }));
    var x =  d3.scale.ordinal()
            .domain([0,1])
            .rangeRoundBands([0, width], 0.1, 0);

    var y = d3.scale.linear()
            .rangeRound([height, 0]);

    var z = d3.scale.category10();

    var xAxis = d3.svg.axis()
            .scale(x)
            .orient("bottom")
            .tickFormat(d3.time.format("%b"));

    var yAxis = d3.svg.axis()
            .scale(y)
            .orient("left");
    console.log(layers);


    x.domain(layers[0].map(function(d) { return d.x; }));
    y.domain([0, d3.max(layers[layers.length - 1], function(d) { return d.y0 + d.y; })]).nice();

    var ticks = x.domain().filter(function(d,i){ return !(i%20); } );
    xAxis.tickValues( ticks );

    var layer = svg.selectAll(".layer")
            .data(layers)
            .enter().append("g")
            .attr("class", "layer")
            .style("fill", function(d, i) { return z(i); });

    layer.selectAll("rect")
            .data(function(d) { return d; })
            .enter().append("rect")
            .attr("x", function(d) { return x(d.x); })
            .attr("y", function(d) { return y(d.y + d.y0); })
            .attr("height", function(d) { return y(d.y0) - y(d.y + d.y0); })
            .attr("width", x.rangeBand() - 1);

    svg.append("g")
            .attr("class", "axis axis--x")
            .attr("transform", "translate(0," + height + ")")
            .call(xAxis);

    svg.append("g")
            .attr("class", "axis axis--y")
            .attr("transform", "translate(" + 0 + ",0)")
            .call(yAxis);
});

我遇到的这个问题是我有一些看起来很丑的白色 space。此 space 出现在图表的第一个柱之前和最后一个柱之后。我试过调整条形的 x 值，但我认为这不是一个好方法。

这个space在数据集小的时候不会来。但是当数据集很大时，这个 space 就会出现。如何从开头和结尾删除此 space。

JSFiddle 对于上面的代码是 https://jsfiddle.net/7qnngbdc/

Answer 1

看这里 --> https://github.com/mbostock/d3/wiki/Ordinal-Scales#ordinal_rangeRoundBands

"Note that rounding necessarily introduces additional outer padding which is, on average, proportional to the length of the domain. For example, for a domain of size 50, an additional 25px of outer padding on either side may be required. Modifying the range extent to be closer to a multiple of the domain length may reduce the additional padding."

设置域后，试试这个 -->

    var mult = Math.max (1, Math.floor (width / x.domain().length));
    x.rangeRoundBands ([0, (x.domain().length * mult)], 0.1, 0);

已更改 https://jsfiddle.net/7qnngbdc/1/

D3 堆栈图表中第一个柱之前不需要的白色 space

Unneeded white space before the 1st bar in D3 Stack chart

javascript

css

d3.js

charts

stacked-chart