danharr/index.html

## readme.md

      
    Raw
  

              readme.md
            
          
    Trying to understand path interpolation. Example here followed:
http://bl.ocks.org/mbostock/1642989
Transition in my example above is jumpy rather than smooth like in above link.

  
## index.html
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>basic line example</title>
<script src="http://d3js.org/d3.v3.min.js"></script>

<style>

 path {
 stroke:red;
 stroke-width:2;
 fill:none;
 }

</style>
</head>
<body>
<script type="text/javascript">

var margin = {top: 20, right: 20, bottom: 20, left: 40},
    width = 1400 - margin.left - margin.right,
    height = 500 - margin.top - margin.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("defs")
    .append("clipPath")
    .attr("id","clip")
    .append("rect")
    .attr("width",width)
    .attr("height",height);


var dataset = [];
    for (var i = 0; i < 55; i++) {
        var newNumber = Math.random();
        dataset.push(newNumber);

}

var xScale = d3.scale.linear().domain([0,54]).range([0,width]);
var yScale = d3.scale.linear().domain([0,1]).range([height,0]);


var line = d3.svg.line()
    .interpolate("basis")
    .x(function(d,i) { return xScale(i); })
    .y(function(d) { return yScale(d); });


var path =  svg.append("g")
.attr("clip-path","url(#clip)")
.append("svg:path")
 .attr("transform","translate(" + xScale(0) + ")")
        .attr("d", line(dataset));


  function animate() {
  svg.selectAll("path")
  .attr("transform","translate(" + xScale(1) + ")")
  .attr("d",line(dataset))
  .transition()
  .ease("linear")
  .duration(3000)
  .attr("transform","translate(" + xScale(0) + ")");
  };


 setInterval(function() {
 dataset.push(Math.random());
 animate();
dataset.shift();}, 1500)


</script>


</body>
</html>
	<!DOCTYPE HTML>
	<html>
	<head>
	<meta charset="utf-8">
	<title>basic line example</title>
	<script src="http://d3js.org/d3.v3.min.js"></script>

	<style>

	path {
	stroke:red;
	stroke-width:2;
	fill:none;
	}

	</style>
	</head>
	<body>
	<script type="text/javascript">

	var margin = {top: 20, right: 20, bottom: 20, left: 40},
	width = 1400 - margin.left - margin.right,
	height = 500 - margin.top - margin.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("defs")
	.append("clipPath")
	.attr("id","clip")
	.append("rect")
	.attr("width",width)
	.attr("height",height);





	var dataset = [];
	for (var i = 0; i < 55; i++) {
	var newNumber = Math.random();
	dataset.push(newNumber);

	}

	var xScale = d3.scale.linear().domain([0,54]).range([0,width]);
	var yScale = d3.scale.linear().domain([0,1]).range([height,0]);




	var line = d3.svg.line()
	.interpolate("basis")
	.x(function(d,i) { return xScale(i); })
	.y(function(d) { return yScale(d); });






	var path = svg.append("g")
	.attr("clip-path","url(#clip)")
	.append("svg:path")
	.attr("transform","translate(" + xScale(0) + ")")
	.attr("d", line(dataset));







	function animate() {
	svg.selectAll("path")
	.attr("transform","translate(" + xScale(1) + ")")
	.attr("d",line(dataset))
	.transition()
	.ease("linear")
	.duration(3000)
	.attr("transform","translate(" + xScale(0) + ")");
	};




	setInterval(function() {
	dataset.push(Math.random());
	animate();
	dataset.shift();}, 1500)


	</script>


	</body>
	</html>