dc
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A multi-dimensional charting library built to work natively with crossfilter and rendered using d3.js
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HTML
<html lang="en">
<head>
<title>dc.js - Bar Chart with Extra Line Example</title>
<meta charset="UTF-8">
<link rel="stylesheet" type="text/css" href="../css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="../css/dc.css"/>
</head>
<body>
<div class="container">
<script type="text/javascript" src="header.js"></script>
<div id="test"></div>
<p style="clear:left">Example of drawing an extra line on top of a bar chart using a renderlet. This is often
wanted in order to show e.g. a regression line.</p>
<p>It would be nice to have better support in
dc.js for such "derived" values, but this example is here to tide folks over until that happens.</p>
<script type="text/javascript" src="../js/promise-polyfill.js"></script>
<script type="text/javascript" src="../js/fetch.umd.js"></script>
<script type="text/javascript" src="../js/d3.js"></script>
<script type="text/javascript" src="../js/crossfilter.js"></script>
<script type="text/javascript" src="../js/dc.js"></script>
<script type="text/javascript">
var chart = dc.barChart("#test");
d3.csv("morley.csv").then(function(experiments) {
experiments.forEach(function(x) {
x.Speed = +x.Speed;
});
var ndx = crossfilter(experiments),
runDimension = ndx.dimension(function(d) {return +d.Run;}),
speedSumGroup = runDimension.group().reduceSum(function(d) {return d.Speed * d.Run / 1000;});
chart
.width(768)
.height(480)
.x(d3.scaleLinear().domain([6,20]))
.brushOn(false)
.yAxisLabel("This is the Y Axis!")
.dimension(runDimension)
.group(speedSumGroup)
.renderLabel(true)
.on('renderlet', function(chart) {
chart.selectAll('rect').on("click", function(d) {
console.log("click!", d);
});
var left_y = 10, right_y = 70; // use real statistics here!
var extra_data = [{x: chart.x().range()[0], y: chart.y()(left_y)}, {x: chart.x().range()[1], y: chart.y()(right_y)}];
var line = d3.line()
.x(function(d) { return d.x; })
.y(function(d) { return d.y; })
.curve(d3.curveLinear);
var chartBody = chart.select('g.chart-body');
var path = chartBody.selectAll('path.extra').data([extra_data]);
path = path
.enter()
.append('path')
.attr('class', 'extra')
.attr('stroke', 'red')
.attr('id', 'extra-line')
.merge(path);
path.attr('d', line);
// and perhaps you'd like to label it?
var text = chartBody.selectAll('text.extra-label').data([0]);
text.enter()
.append('text')
.attr('text-anchor', 'middle')
.append('textPath')
.attr('class', 'extra-label')
.attr('xlink:href', '#extra-line')
.attr('startOffset', '50%')
.text('this is a label for the line');
});
chart.render();
});
</script>
</div>
</body>
</html>