jsl6906/index.html

## readme.md

      
    Raw
  

              readme.md
            
          
    Grouping of an ordinal scale not using the axis component
In response to: http://stackoverflow.com/questions/25913528/add-second-x-axis-to-scatterplot-to-display-group-information

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<style>
  text {
    font: 12px sans-serif;
  }
  .axis path, .axis line, g.chartGroup path {
    fill: none;
    stroke: #000;
    shape-rendering: crispEdges;
  }
  circle.point {
    fill: steelblue;
    stroke: black;
  }
</style>
<script>

var margin = {top: 10, right: 10, bottom: 30, left: 30},
    width = 500 - margin.left - margin.right,
    height = 300 - margin.top - margin.bottom,
    offset = 7;

var chartData = [
  {name: "AB", group: "A", number: 0.5},
  {name: "ABC", group: "A", number: 10.0},
  {name: "BC", group: "B", number: 3.0},
  {name: "BCD", group: "B", number: 5.0},
  {name: "BCDE", group: "B", number: 0.3},
  {name: "CD", group: "C", number: 1.6},
  {name: "DE", group: "D", number: 1.5}
];

var x = d3.scale.ordinal()
      .domain(chartData.map(function(d) { return d.name; }))
      .rangePoints([0, width]);

var chartGroups = [];
chartData.forEach(function(d, i, array) {
  if (i === 0) d.first = true; else if (d.group !== array[i - 1].group) d.first = true;
  if (i === array.length - 1) d.last = true; else if (d.group !== array[i + 1].group) d.last = true;
  if (d.first) chartGroups.push({
    group: d.group,
    start: i === 0 ? x(d.name) : ((x(d.name) + x(array[i - 1].name)) / 2)
  });
  if (d.last) chartGroups[chartGroups.length - 1].end =
    i === array.length - 1 ? x(d.name) : ((x(d.name) + x(array[i + 1].name)) / 2);
});

var y = d3.scale.linear()
      .domain([0, d3.max(chartData, function(d) { return d.number; })])
      .range([height, 0]),
    xAxis = d3.svg.axis()
      .scale(x)
      .tickValues([])
      .outerTickSize(offset)
      .orient("bottom"),
    yAxis = d3.svg.axis()
      .scale(y)
      .orient("left");

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.selectAll("circle.point")
    .data(chartData)
  .enter().append("circle")
    .attr({
      "class": "point",
      cx: function(d) { return x(d.name); },
      cy: function(d) { return y(d.number); },
      r: 5
    });

var groups = svg.selectAll("g.chartGroup")
    .data(chartGroups)
  .enter().append("g")
    .attr("class", "chartGroup")
    .attr("transform", "translate(" + 0 + "," + (height + offset) + ")");
groups.append("text")
    .attr({
      x: function(d) { return (d.start + d.end) / 2; },
      dy: "1em",
      "text-anchor": "middle"
    })
    .text(function(d) { return d.group; });
groups.append("path")
    .attr("d", function(d) {
      var t = d3.select(this.parentNode).select("text").node().getBBox(),
          ttop = [t.x + t.width / 2, t.y];
      console.log(d, t, ttop);
      return "M" + d.start + ",0" + "V" + -offset;
    });

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

svg.append("g")
    .attr("class", "y axis")
    .call(yAxis);

</script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<style>
	text {
	font: 12px sans-serif;
	}
	.axis path, .axis line, g.chartGroup path {
	fill: none;
	stroke: #000;
	shape-rendering: crispEdges;
	}
	circle.point {
	fill: steelblue;
	stroke: black;
	}
	</style>
	<script>

	var margin = {top: 10, right: 10, bottom: 30, left: 30},
	width = 500 - margin.left - margin.right,
	height = 300 - margin.top - margin.bottom,
	offset = 7;

	var chartData = [
	{name: "AB", group: "A", number: 0.5},
	{name: "ABC", group: "A", number: 10.0},
	{name: "BC", group: "B", number: 3.0},
	{name: "BCD", group: "B", number: 5.0},
	{name: "BCDE", group: "B", number: 0.3},
	{name: "CD", group: "C", number: 1.6},
	{name: "DE", group: "D", number: 1.5}
	];

	var x = d3.scale.ordinal()
	.domain(chartData.map(function(d) { return d.name; }))
	.rangePoints([0, width]);

	var chartGroups = [];
	chartData.forEach(function(d, i, array) {
	if (i === 0) d.first = true; else if (d.group !== array[i - 1].group) d.first = true;
	if (i === array.length - 1) d.last = true; else if (d.group !== array[i + 1].group) d.last = true;
	if (d.first) chartGroups.push({
	group: d.group,
	start: i === 0 ? x(d.name) : ((x(d.name) + x(array[i - 1].name)) / 2)
	});
	if (d.last) chartGroups[chartGroups.length - 1].end =
	i === array.length - 1 ? x(d.name) : ((x(d.name) + x(array[i + 1].name)) / 2);
	});

	var y = d3.scale.linear()
	.domain([0, d3.max(chartData, function(d) { return d.number; })])
	.range([height, 0]),
	xAxis = d3.svg.axis()
	.scale(x)
	.tickValues([])
	.outerTickSize(offset)
	.orient("bottom"),
	yAxis = d3.svg.axis()
	.scale(y)
	.orient("left");

	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.selectAll("circle.point")
	.data(chartData)
	.enter().append("circle")
	.attr({
	"class": "point",
	cx: function(d) { return x(d.name); },
	cy: function(d) { return y(d.number); },
	r: 5
	});

	var groups = svg.selectAll("g.chartGroup")
	.data(chartGroups)
	.enter().append("g")
	.attr("class", "chartGroup")
	.attr("transform", "translate(" + 0 + "," + (height + offset) + ")");
	groups.append("text")
	.attr({
	x: function(d) { return (d.start + d.end) / 2; },
	dy: "1em",
	"text-anchor": "middle"
	})
	.text(function(d) { return d.group; });
	groups.append("path")
	.attr("d", function(d) {
	var t = d3.select(this.parentNode).select("text").node().getBBox(),
	ttop = [t.x + t.width / 2, t.y];
	console.log(d, t, ttop);
	return "M" + d.start + ",0" + "V" + -offset;
	});

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

	svg.append("g")
	.attr("class", "y axis")
	.call(yAxis);

	</script>