Skip to content

Instantly share code, notes, and snippets.

@ChrisLuv
Last active December 23, 2015 14:59
Show Gist options
  • Save ChrisLuv/6652581 to your computer and use it in GitHub Desktop.
Save ChrisLuv/6652581 to your computer and use it in GitHub Desktop.
Sample Mapping Example for CCG Boundaries
Display the source blob
Display the rendered blob
Raw
Sorry, something went wrong. Reload?
Sorry, we cannot display this file.
Sorry, this file is invalid so it cannot be displayed.
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.background {
fill: none;
pointer-events: all;
}
#states {
fill: #aaa;
}
#states .active {
fill: orange;
}
#state-borders {
fill: none;
stroke: #fff;
stroke-width: 1.5px;
stroke-linejoin: round;
stroke-linecap: round;
pointer-events: none;
}
#tooltip {
position: absolute;
width: 200px;
height: auto;
padding: 10px;
background-color: white;
-webkit-border-radius: 10px;
-moz-border-radius: 10px;
border-radius: 10px;
-webkit-box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.4);
-moz-box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.4);
box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.4);
pointer-events: none;
}
#tooltip.hidden {
display: none;
}
#tooltip p {
margin: 0;
font-family: sans-serif;
font-size: 16px;
line-height: 20px;
}
</style>
<body>
<div id="tooltip" class="hidden">
<p><strong>CCG Name</strong></p>
<p><span id="value">100</span></p>
</div>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script>
var width = 960,
height = 1160, centered;
var projection = d3.geo.albers()
.center([0, 52.4])
.rotate([4.4, 0])
.parallels([50, 60])
.scale(1200 * 5)
.translate([width / 2, height / 2]);
var path = d3.geo.path()
.projection(projection);
var zoom = d3.behavior.zoom()
.translate(projection.translate())
.scale(projection.scale())
.scaleExtent([height, 38 * height])
.on("zoom", zoomed);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var g = svg.append("g")
.call(zoom);
g.append("rect")
.attr("class", "background")
.attr("width", width)
.attr("height", height)
.on("click", clicked);
d3.json("ccg-boundaries.json", function(error, uk) {
g.append("g")
.attr("id", "states")
.selectAll("path")
.data(topojson.feature(uk, uk.objects.ccg_boundaries).features)
.enter().append("path")
.attr("d", path)
.on("click", clicked)
.on("mouseover", function(d) { d3.select(this).classed("active", true )
var centroid = path.centroid(d)
var xPosition = centroid[0]
var yPosition = centroid[1]
//Update the tooltip position and value
d3.select("#tooltip")
.style("left", xPosition + "px")
.style("top", yPosition + "px")
.select("#value")
.text(d.properties.ccg_name);
//Show the tooltip
d3.select("#tooltip").classed("hidden", false);
})
.on("mouseout", function(d) { d3.select(this).classed("active", false)
//Hide the tooltip
d3.select("#tooltip").classed("hidden", true);})
g.append("path")
.datum(topojson.mesh(uk, uk.objects.ccg_boundaries, function(a, b) { return a !== b; }))
.attr("id", "state-borders")
.attr("d", path);
});
function clicked(d) {
var x, y, k;
if (d && centered !== d) {
var centroid = path.centroid(d);
x = centroid[0];
y = centroid[1];
k = 4;
centered = d;
} else {
x = width / 2;
y = height / 2;
k = 1;
centered = null;
}
g.selectAll("path")
.classed("active", centered && function(d) { return d === centered; });
g.transition()
.duration(750)
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")scale(" + k + ")translate(" + -x + "," + -y + ")")
.style("stroke-width", 1.5 / k + "px");
}
function zoomed() {
projection.translate(d3.event.translate).scale(d3.event.scale);
g.selectAll("path").attr("d", path);
centered = null;
}
</script>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment