tomgp/index.html

## readme.md

      
    Raw
  

              readme.md
            
          
    based on http://bl.ocks.org/mbostock/3310323 this shows how you put gaps in your line for missinng data -- here denoted by randomly inserting NaN values (so you may need to refresh the page if you don't see any breaks)

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 10px sans-serif;
}

.axis path, .axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

.dot {
  fill: white;
  stroke: steelblue;
  stroke-width: 1.5px;
}

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>

var data = d3.range(20).map(function(i) {
  return {x: i / 19, y: (Math.sin(i / 3) + 2) / 4};
}).map(function(d){ //remove y values at random
  if(Math.random() < 0.1){
    return {
      x:d.x,
      y:NaN
    }
  }
  return d;
});


var margin = {top: 20, right: 30, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.linear()
    .domain([0, 1])
    .range([0, width]);

var y = d3.scale.linear()
    .domain([0, 1])
    .range([height, 0]);

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

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

var line = d3.svg.line()
    .interpolate(function(points){  //interpolate straight lines with gaps for NaN
      var section = 0;
      var arrays = [[]];
      points.forEach(function(d,i){
        if(isNaN(d[1])){
          section++;
          arrays[section] = [];
        }else{
          arrays[section].push(d)
        }
      });

      var pathSections = [];
      arrays.forEach(function(points){
        pathSections.push(d3.svg.line()(points));
      })
      var joined = pathSections.join('');
      return joined.substr(1); //substring becasue D£ always adds an M to a path so we end up with MM at the start
    })
    .x(function(d) { return x(d.x); })
    .y(function(d) { return y(d.y); });

var svg = d3.select("body").append("svg")
    .datum(data)
    .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")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

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

svg.append("path")
    .attr("class", "line")
    .attr("d", line);

</script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	body {
	font: 10px sans-serif;
	}

	.axis path, .axis line {
	fill: none;
	stroke: #000;
	shape-rendering: crispEdges;
	}

	.line {
	fill: none;
	stroke: steelblue;
	stroke-width: 1.5px;
	}

	.dot {
	fill: white;
	stroke: steelblue;
	stroke-width: 1.5px;
	}

	</style>
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script>

	var data = d3.range(20).map(function(i) {
	return {x: i / 19, y: (Math.sin(i / 3) + 2) / 4};
	}).map(function(d){ //remove y values at random
	if(Math.random() < 0.1){
	return {
	x:d.x,
	y:NaN
	}
	}
	return d;
	});


	var margin = {top: 20, right: 30, bottom: 30, left: 40},
	width = 960 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom;

	var x = d3.scale.linear()
	.domain([0, 1])
	.range([0, width]);

	var y = d3.scale.linear()
	.domain([0, 1])
	.range([height, 0]);

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

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

	var line = d3.svg.line()
	.interpolate(function(points){ //interpolate straight lines with gaps for NaN
	var section = 0;
	var arrays = [[]];
	points.forEach(function(d,i){
	if(isNaN(d[1])){
	section++;
	arrays[section] = [];
	}else{
	arrays[section].push(d)
	}
	});

	var pathSections = [];
	arrays.forEach(function(points){
	pathSections.push(d3.svg.line()(points));
	})
	var joined = pathSections.join('');
	return joined.substr(1); //substring becasue D£ always adds an M to a path so we end up with MM at the start
	})
	.x(function(d) { return x(d.x); })
	.y(function(d) { return y(d.y); });

	var svg = d3.select("body").append("svg")
	.datum(data)
	.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")
	.attr("transform", "translate(0," + height + ")")
	.call(xAxis);

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

	svg.append("path")
	.attr("class", "line")
	.attr("d", line);

	</script>