Question

我看到很多D3代码都有这样的东西：

var x = d3.scale.ordinal()
  .rangeRoundBands([0, width], .1);

截至D3版本4.0 d3.scale.ordinal()现在为d3.scaleOrdinal，rangeRoundBands似乎已消失。

> d3.scaleOrdinal()

{ 
  [Function: scale]
  domain: [Function],
  range: [Function],
  unknown: [Function],
  copy: [Function] 
}

D3 v4相当于这段代码（来自Mike Bostock＆＃39; s bar chart example）会是什么？

var x = d3.scale.ordinal()
  .rangeRoundBands([0, width], .1);

Answer 1

在D3 4.x rangeRoundBands被移动到新的 Band 比例：

d3.scaleBand()
    .range([range])
    .round([round]);

相当于：

d3.scaleBand()
    .rangeRound([range]);

以下是API：https://github.com/d3/d3-scale#band-scales

Answer 2

var x = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);

以上计算波段并设置波段之间的填充。在v4中，等价物是

var x = d3.scaleBand()
    .rangeRound([0, width])
    .padding(0.1);

Answer 3

var svg = d3.select("svg"),

margin = {top: 20, right: 20, bottom: 30, left: 60},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom;

var x = d3.scaleBand().rangeRound([0, width]).padding(0.1),
    y = d3.scaleLinear().rangeRound([height, 0]);

var g = svg.append("g")
   .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.tsv("data.txt", function(d) {
  d.y = +d.y;
  return d;
}, function(error, data) {
  if (error) throw error;

  x.domain(data.map(function(d) { return d.x; }));
  y.domain([0, d3.max(data, function(d) { return d.y; })]);

使用scaleBand和scaleLinear的经典图表的可启动语法。

D3 4.0 rangeRoundBands相当于？

3 个答案: