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09_axes.html
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09_axes.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: Axes</title>
<script type="text/javascript" src="d3.js"></script>
<style type="text/css">
body {
background-color: #ccc;
}
svg {
background-color: white;
}
.axis path,
.axis line {
fill: none;
stroke: black;
shape-rendering: crispEdges;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
</style>
</head>
<body>
<script type="text/javascript">
//Width and height
var w = 500;
var h = 300;
var padding = 40;
//Dynamic, random dataset
var dataset = []; //Initialize empty array
var numDataPoints = 50; //Number of dummy data points to create
var maxRange = Math.random() * 1000; //Max range of new values
for (var i = 0; i < numDataPoints; i++) { //Loop numDataPoints times
var newNumber1 = Math.floor(Math.random() * maxRange); //New random integer
var newNumber2 = Math.floor(Math.random() * maxRange); //New random integer
dataset.push([newNumber1, newNumber2]); //Add new number to array
}
//Create scale functions
var xScale = d3.scale.linear()
.domain([0, d3.max(dataset, function(d) { return d[0]; })])
.range([padding, w - padding]);
var yScale = d3.scale.linear()
.domain([0, d3.max(dataset, function(d) { return d[1]; })])
.range([h - padding, padding]);
//Define X axis
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.ticks(5);
//Define Y axis
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left")
.ticks(5);
//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Create circles
svg.append("g")
.attr("id", "circles")
.selectAll("circle")
.data(dataset)
.enter()
.append("circle")
.attr("cx", function(d) {
return xScale(d[0]);
})
.attr("cy", function(d) {
return yScale(d[1]);
})
.attr("r", 2);
//Create X axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + (h - padding + 5) + ")")
.call(xAxis);
//Create Y axis
svg.append("g")
.attr("class", "y axis")
.attr("transform", "translate(" + (padding - 5) + ",0)")
.call(yAxis);
</script>
</body>
</html>