shripadk/README.md

## README.md

      
    Raw
  

              README.md
            
          
    A line chart with mouseover so that you can read the y-value based on the closest x-value. The x-value is found using d3.mouse and scale.invert. The y-value is then found by bisecting the data.

  
## data-small.tsv

          
            date
            close

            
              1-May-12
              582.13

            
              30-Apr-12
              583.98

            
              27-Apr-12
              603.00

            
              26-Apr-12
              607.70

            
              25-Apr-12
              610.00

            
              24-Apr-12
              560.28

            
              23-Apr-12
              571.70

            
              20-Apr-12
              572.98

            
              19-Apr-12
              587.44

            
              18-Apr-12
              608.34

            
              17-Apr-12
              609.70

            
              16-Apr-12
              580.13

            
              13-Apr-12
              605.23

            
              12-Apr-12
              622.77

            
              11-Apr-12
              626.20

## 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;
}

.x.axis path {
  display: none;
}

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

.overlay {
  fill: none;
  pointer-events: all;
}

.focus circle {
  fill: none;
  stroke: steelblue;
}

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

var margin = {top: 20, right: 50, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var parseDate = d3.time.format("%d-%b-%y").parse,
    bisectDate = d3.bisector(function(d) { return d.date; }).left,
    formatValue = d3.format(",.2f"),
    formatCurrency = function(d) { return "$" + formatValue(d); };

var x = d3.time.scale()
    .range([0, width]);

var y = d3.scale.linear()
    .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()
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.close); })
    .interpolate('basis');

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 + ")");

d3.tsv("data-small.tsv", function(error, data) {
  data.forEach(function(d) {
    d.date = parseDate(d.date);
    d.close = +d.close;
  });

  data.sort(function(a, b) {
    return a.date - b.date;
  });

  x.domain([data[0].date, data[data.length - 1].date]);
  y.domain(d3.extent(data, function(d) { return d.close; }));

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

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Price ($)");

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

  var focus = svg.append("g")
      .attr("class", "focus")
      .style("display", "none");

  focus.append("circle")
      .attr("r", 4.5);

  focus.append("text")
      .attr("x", 9)
      .attr("dy", ".35em");

  svg.append("rect")
      .attr("class", "overlay")
      .attr("width", width)
      .attr("height", height)
      .on("mouseover", function() { focus.style("display", null); })
      .on("mouseout", function() { focus.style("display", "none"); })
      .on("mousemove", mousemove);

  function mousemove() {
    var x0 = x.invert(d3.mouse(this)[0]),
        i = bisectDate(data, x0, 1),
        d0 = data[i - 1],
        d1 = data[i],
        d = x0 - d0.date > d1.date - x0 ? d1 : d0;
    focus.attr("transform", "translate(" + x(d.date) + "," + y(d.close) + ")");
    focus.select("text").text(formatCurrency(d.close));
  }
});

</script>

## thumbnail.png

      
    Raw
  

              thumbnail.png
	date	close
	1-May-12	582.13
	30-Apr-12	583.98
	27-Apr-12	603.00
	26-Apr-12	607.70
	25-Apr-12	610.00
	24-Apr-12	560.28
	23-Apr-12	571.70
	20-Apr-12	572.98
	19-Apr-12	587.44
	18-Apr-12	608.34
	17-Apr-12	609.70
	16-Apr-12	580.13
	13-Apr-12	605.23
	12-Apr-12	622.77
	11-Apr-12	626.20
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	body {
	font: 10px sans-serif;
	}

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

	.x.axis path {
	display: none;
	}

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

	.overlay {
	fill: none;
	pointer-events: all;
	}

	.focus circle {
	fill: none;
	stroke: steelblue;
	}

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

	var margin = {top: 20, right: 50, bottom: 30, left: 50},
	width = 960 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom;

	var parseDate = d3.time.format("%d-%b-%y").parse,
	bisectDate = d3.bisector(function(d) { return d.date; }).left,
	formatValue = d3.format(",.2f"),
	formatCurrency = function(d) { return "$" + formatValue(d); };

	var x = d3.time.scale()
	.range([0, width]);

	var y = d3.scale.linear()
	.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()
	.x(function(d) { return x(d.date); })
	.y(function(d) { return y(d.close); })
	.interpolate('basis');

	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 + ")");

	d3.tsv("data-small.tsv", function(error, data) {
	data.forEach(function(d) {
	d.date = parseDate(d.date);
	d.close = +d.close;
	});

	data.sort(function(a, b) {
	return a.date - b.date;
	});

	x.domain([data[0].date, data[data.length - 1].date]);
	y.domain(d3.extent(data, function(d) { return d.close; }));

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

	svg.append("g")
	.attr("class", "y axis")
	.call(yAxis)
	.append("text")
	.attr("transform", "rotate(-90)")
	.attr("y", 6)
	.attr("dy", ".71em")
	.style("text-anchor", "end")
	.text("Price ($)");

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

	var focus = svg.append("g")
	.attr("class", "focus")
	.style("display", "none");

	focus.append("circle")
	.attr("r", 4.5);

	focus.append("text")
	.attr("x", 9)
	.attr("dy", ".35em");

	svg.append("rect")
	.attr("class", "overlay")
	.attr("width", width)
	.attr("height", height)
	.on("mouseover", function() { focus.style("display", null); })
	.on("mouseout", function() { focus.style("display", "none"); })
	.on("mousemove", mousemove);

	function mousemove() {
	var x0 = x.invert(d3.mouse(this)[0]),
	i = bisectDate(data, x0, 1),
	d0 = data[i - 1],
	d1 = data[i],
	d = x0 - d0.date > d1.date - x0 ? d1 : d0;
	focus.attr("transform", "translate(" + x(d.date) + "," + y(d.close) + ")");
	focus.select("text").text(formatCurrency(d.close));
	}
	});

	</script>