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@lewang
Forked from maaquib/index.html
Last active September 15, 2015 23:02
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D3JS Bar Graph (Above and Below x-axis with animation)
window.onload=function(){
var data = [-15, 20, -22, 18, -2, 6, -26, 18],
duration = 300;
var margin = {top: 30, right: 10, bottom: 10, left: 30},
width = 320 - margin.left - margin.right,
height = 250 - margin.top - margin.bottom;
var y0 = Math.max(Math.abs(d3.min(data)), Math.abs(d3.max(data)));
var y = d3.scale.linear()
.domain([-y0, y0])
.range([height,0])
.nice();
var x = d3.scale.ordinal()
.domain(d3.range(data.length * 2))
.rangeRoundBands([0, width], .1);
var 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("rect")
.data(data)
.enter().append("rect")
.attr("class", function(d) { return d < 0 ? "bar negative" : "bar positive"; })
.attr("y", function(d) { return y(0); })
.attr("x", function(d, i) {
if (d < 0) { return x(i)/2; }
else { return x(i-1)/2; }
})
.attr("width", x.rangeBand())
.attr("height", 0)
.transition().delay(function (d,i){
if (d < 0) { return i * duration + data.length * duration; }
else {return i * duration;}
})
.duration(duration)
.attr("height", function(d) { return Math.abs(y(d) - y(0)); })
.attr("y", function(d) { return y(Math.max(0, d)); });
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
svg.append("g")
.attr("class", "x axis")
.append("line")
.attr("y1", y(0))
.attr("y2", y(0))
.attr("x1", 0)
.attr("x2", width);
}
<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script>
<script type="text/javascript" src="dualbar.js"></script>
<style type="text/css">
.bar.positive {
fill: steelblue;
}
.bar.negative {
fill: brown;
}
.axis text {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
</style>
</head>
<body></body>
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