如何在d3.js中添加自定义刻度标签？

Question

I want to add custom tick labels on the x axis,like 1,2,3,4,3,2,1 in this pattern. But the code that I am using doesn't show the decreasing numbers.

var margin = {
    top: 100,
    right: 100,
    bottom: 100,
    left: 100
},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;

var x = d3.scale.ordinal()
    .domain([1, 2, 3, 4, 5, 4, 3, 2, 1])
    .rangePoints([0, width]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("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 + ")");

svg.append("g")
.attr("class", "x axis")
.call(xAxis);

Any kind of help would be appreciated. Thanks.

Answer 1

Little hack it needed to solve this issue.

Cause

• d3.scale.ordinal(), domain calculation in purely mathematical logic. Each domain associated with a range. ( f(x)=y ).
• Duplication not allowed because it will make ambiguity

Solution

• Create linear scale with total item in the axis as domain [0, itemLength]
• While creating axis use tickFormat to find out the index of the element

 var margin = { top: 100, right: 100, bottom: 100, left: 100 }, width = 560 - margin.left - margin.right, height = 500 - margin.top - margin.bottom; var xdata = ["1", "2", "3", "4", "5", "4", "3", "2", "1", "0"]; var linear = d3.scale.linear() .domain([0, 10]) .range([0, width]); var xAxis = d3.svg.axis() .scale(linear) .orient("bottom"); var axis = d3.svg.axis() .scale(linear) .orient("top") .ticks(10) .tickFormat(function (d) { return xdata[d]; }); 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 + ")"); svg.append("g") .attr("class", "x axis") .call(axis); 

 .axis path, line { fill: none; stroke: #000; stroke-linecap: round; } 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>