我在d3.js中构建一个带有序数x轴的条形图,其刻度应该用文本标记图表。任何人都可以解释序数规模"映射" x勾选到相应的栏位置?具体来说,如果我想用条形图中相应条形指定带有文本值数组的x刻度标签。
目前,我将域名设置如下:
var labels = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t"];
var xScale = d3.scale.ordinal()
.domain(labels)
但是,文本标签后显示的值为1-19。
正如此小提琴所见:
http://jsfiddle.net/chartguy/FbqjD/
Associated Fiddle源代码:
//Width and height
var margin = {top: 20, right: 20, bottom: 30, left: 40};
var width = 600 - margin.left - margin.right;
var height= 500-margin.top -margin.bottom;
var w = width;
var h = height;
var dataset = [ 5, 10, 13, 19, 21, 25, 22, 18, 15, 13,
11, 12, 15, 20, 18, 17, 16, 18, 23, 25 ];
var labels = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t"];
var xScale = d3.scale.ordinal()
.domain(labels)
.rangeRoundBands([margin.left, width], 0.05);
var xAxis = d3.svg.axis().scale(xScale).orient("bottom");
var yScale = d3.scale.linear()
.domain([0, d3.max(dataset)])
.range([h,0]);
//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create bars
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", function(d, i) {
return xScale(i);
})
.attr("y", function(d) {
return yScale(d);
})
.attr("width", xScale.rangeBand())
.attr("height", function(d) {
return h - yScale(d);
})
.attr("fill", function(d) {
return "rgb(0, 0, 0)";
});
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + 0 + ")")
.call(xAxis);
//Create labels
svg.selectAll("text")
.data(dataset)
.enter()
.append("text")
.text(function(d) {
return d;
})
.attr("x", function(d, i) {
return xScale(i) + xScale.rangeBand() / 2;
})
.attr("y", function(d) {
return h - yScale(d) + 14;
});
答案 0 :(得分:15)
您可以使用d3.svg.axis().tickValues(*array*)
明确设置序号轴的刻度值。
但这是一种奇怪的方法,因为它会危险地分离您的键和值,这意味着您必须小心手动对齐刻度并确保您的数据正确对应。它有助于将键和值分组到单个对象中,然后使用以下格式:
axis.domain(array.map(function (d) { return d.value; }))
映射您的轴域。
我已经重新设计了你的数据,并在我认为更多的d3 way中进行了操作。 (另请注意,我为了好玩而进行了一些其他更改,即改善了边距并清理了轴对齐等)。