Assigning alphanumeric characters to the axis for identification purposes

review the code in index.html

<!DOCTYPE html>
<html>
  <head>
    <title>D3 test</title>
          <style>

       .grid .tick {
stroke: lightgrey;
        opacity: 0.7;
   }
      .grid path {
stroke-width: 0;
 }
  .chart {
     }
    .main text {
   font: 10px sans-serif;
 }
    .axis line, .axis path {
shape-rendering: crispEdges;
stroke: black;
fill: none;
    }
    circle {
fill: steelblue;
      }



     </style>
    <script type="text/javascript" src="http://mbostock.github.com/d3/d3.v2.js">   

                    </script>
    <script src="http://d3js.org/d3.v3.min.js"></script>
    <script src="http://d3js.org/topojson.v1.min.js"></script>
  </head>
  <body>
    <div class='content'>
      <!-- /the chart goes here -->
    </div>

   <script type="text/javascript" src="scatterchart.js"></script>

  </body>
</html>

scatterchart.js script:

var color = d3.scale.ordinal().range(["#b41f2d", "#ff7f0e"]);

     var data = [

[2,2],
[3,3],

[4,4],
[5, 4],
[5.5, 5],
[6, 6],
[6, 7],

[6.5,8],
[6.5,16],

[17, 16]
 ];

var margin = {
top: 20,
right: 15,
bottom: 60,
left: 25
}, 
width = 950 - margin.left - margin.right,
height = 480 - margin.top - margin.bottom;

var x = d3.scale.linear()
.domain([0, d3.max(data, function (d) {
return d[0];
})])
.range([0, width]);

var y = d3.scale.linear()
.domain([0, d3.max(data, function (d) {
return d[1];
})])
.range([0, height]);

var chart = d3.select('body')
.append('svg:svg')
.attr('width', width + margin.right + margin.left)
.attr('height', height + margin.top + margin.bottom)
.attr('class', 'chart');

var main = chart.append('g')
.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')
.attr('width', width)
.attr('height', height)
.attr('class', 'main');

var xAxis = d3.svg.axis()
.scale(x)
.orient('top');

main.append('g')
.attr('transform', 'translate(0,0)')
.attr('class', 'main axis date')
.call(xAxis);

var yAxis = d3.svg.axis()
.scale(y)
.orient('left');

main.append('g')
.attr('transform', 'translate(0,0)')
.attr('class', 'main axis date')
.call(yAxis);

var g = main.append("svg:g");

g.selectAll("scatter-dots")
.data(data)
.enter().append("svg:circle")
.attr("cx", function (d, i) {
return x(d[0]);
}) 
.attr("cy", function (d) {
return y(d[1]);
}) 
.attr("r", 5)
.style("fill", function (d) { return color(d[0]);}) ;

var line = d3.svg.line()
.x(function(d){return x(d[0]);})
.y(function(d){return y(d[1]);})
.interpolate("linear");  

g.append("path")
.attr("d", function(d) { return line(data)})
.attr("transform", "translate(0,0)")
.style("stroke-width", 2)
.style("stroke", "steelblue")
.style("fill", "none");

main.append("g")
.attr("class", "grid")
.attr("transform", "translate(0," + height + ")")
.call(make_x_axis()
.tickSize(-height, 0, 0)
.tickFormat(function(d, i) { return 'x' + (i+1); }));

main.append("g")
.attr("class", "grid")
.call(make_y_axis()
.tickSize(-width, 0, 0)
.tickFormat(function(d, i) { return 'y' + (i+1); }));

function make_x_axis() {
return d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .ticks(30)
}

function make_y_axis() {
return d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(17)
}

To label the x-axis as x1, x2, x3... and y-axis as y1, y2, y3... instead of using 0, 1, 2...

Answer №1

If you're looking to create a customized format for your axis, you can utilize the axis.tickFormat method. Here's a simple example for formatting the x axis:

axis.tickFormat(function(d) {
    return "x" + d;
});

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