d3
Version:
A small, free JavaScript library for manipulating documents based on data.
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HTML
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>Albers Projection</title>
<script type="text/javascript" src="../../d3.js"></script>
<script type="text/javascript" src="../../d3.geo.js"></script>
<script type="text/javascript" src="../../lib/jquery/jquery.min.js"></script>
<script type="text/javascript" src="../../lib/jquery-ui/jquery-ui.min.js"></script>
<style type="text/css">
@import url("../../lib/jquery-ui/jquery-ui.css");
body, .ui-widget {
font: 14px Helvetica Neue;
}
svg {
width: 960px;
height: 500px;
border: solid 1px #ccc;
background: #eee;
}
#states path {
fill: #ccc;
stroke: #fff;
}
#states circle {
fill: #fcc;
stroke: #000;
}
div {
width: 960px;
}
</style>
</head>
<body>
<h3>Albers Projection</h3>
<script type="text/javascript">
// Our projection.
var xy = d3.geo.albers(),
path = d3.geo.path().projection(xy);
d3.select("body")
.append("svg:svg")
.append("svg:g")
.attr("id", "states");
d3.json("../data/us-states.json", function(collection) {
d3.select("#states")
.selectAll("path")
.data(collection.features)
.enter().append("svg:path")
.attr("d", path);
d3.select("#states")
.append("svg:circle")
.attr("r", 10)
.attr("transform", "translate(" + xy(xy.origin()).join(",") + ")")
});
function refresh() {
d3.selectAll("#states path")
.attr("d", path);
d3.select("#states circle")
.attr("transform", "translate(" + xy(xy.origin()).join(",") + ")")
d3.select("#parallels span")
.text(xy.parallels());
d3.select("#lon span")
.text(xy.origin()[0]);
d3.select("#lat span")
.text(xy.origin()[1]);
d3.select("#scale span")
.text(xy.scale());
d3.select("#translate-x span")
.text(xy.translate()[0]);
d3.select("#translate-y span")
.text(xy.translate()[1]);
}
</script><p>
<div id="lon">origin.longitude: <span>-98</span></div>
<div id="lat">origin.latitude: <span>38</span></div><p>
<div id="parallels">parallels: <span>29.5,45.5</span></div><p>
<div id="scale">scale: <span>1000</span></div><p>
<div id="translate-x">translate.x: <span>480</span></div>
<div id="translate-y">translate.y: <span>250</span></div>
<script type="text/javascript">
$("#parallels").slider({
range: true,
min: -90,
max: 90,
step: 1e-1,
values: [29.5, 45.5],
slide: function(event, ui) {
xy.parallels(ui.values);
refresh();
}
});
$("#lon").slider({
min: -180,
max: 180,
step: 1e-1,
value: -98,
slide: function(event, ui) {
var origin = xy.origin();
origin[0] = ui.value;
xy.origin(origin);
refresh();
}
});
$("#lat").slider({
min: -90,
max: 90,
step: 1e-1,
value: 38,
slide: function(event, ui) {
var origin = xy.origin();
origin[1] = ui.value;
xy.origin(origin);
refresh();
}
});
$("#scale").slider({
min: 0,
max: 3000,
value: 1000,
slide: function(event, ui) {
xy.scale(ui.value);
refresh();
}
});
$("#translate-x").slider({
min: -2000,
max: 2000,
value: 480,
slide: function(event, ui) {
var translate = xy.translate();
translate[0] = ui.value;
xy.translate(translate);
refresh();
}
});
$("#translate-y").slider({
min: -2000,
max: 2000,
value: 250,
slide: function(event, ui) {
var translate = xy.translate();
translate[1] = ui.value;
xy.translate(translate);
refresh();
}
});
</script>
</body>
</html>