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@HarryStevens HarryStevens/.block

Last active Jul 4, 2018
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Basic Map Zooming
license: gpl-3.0

It's ridiculous how easy d3-zoom makes it to zoom elements.

<!DOCTYPE html>
<html>
<head>
<style>
body {
margin: 0;
font-family: "Helvetica Neue", sans-serif;
cursor: default;
}
.subunit {
stroke: #fff;
stroke-width: .5px;
}
.subunit.highlight {
stroke: #000;
stroke-width: 2px;
}
.subunit-boundary {
fill: none;
stroke: #000;
stroke-width: 1px;
}
</style>
</head>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<!-- <script src="https://d3js.org/d3-geo-projection.v2.min.js"></script> -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.min.js"></script>
<script>
var width = window.innerWidth, height = window.innerHeight;
var projection = d3.geoAzimuthalEqualArea()
.rotate([-70, -10, -1]);
var path = d3.geoPath()
.projection(projection)
.pointRadius(2);
var svg = d3.select("body").append("svg").attr("width", width).attr("height", height);
var g = svg.append("g").attr("width", width).attr("height", height);
var colors = ["#8dd3c7", "#ffffb3", "#bebada", "#fb8072", "#80b1d3", "#fdb462", "#b3de69", "#fccde5", "#fbb4ae", "#b3cde3", "#ccebc5", "#decbe4", "#fed9a6", "#ffffcc", "#e5d8bd", "#fddaec", "#e41a1c", "#377eb8", "#4daf4a", "#984ea3", "#ff7f00", "#ffff33", "#a65628", "#f781bf"];
d3.json("india_state.json", (error, data) => {
var feature = topojson.feature(data, data.objects.polygons);
projection.fitSize([width, height], feature);
g.selectAll(".subunit")
.data(feature.features, d => d.properties.ST_NM)
.enter().append("path")
.attr("class", "subunit")
.attr("d", path)
.style("fill", (d, i) => colors[i % colors.length])
.on("mouseover", function(){
d3.select(this).classed("highlight", true).raise();
d3.select(".subunit-boundary").raise();
})
.on("mouseout", () => {
d3.selectAll(".subunit").classed("highlight", false);
});
g.append("path")
.datum(topojson.mesh(data, data.objects.polygons, (a, b) => a === b))
.attr("d", path)
.attr("class", "subunit-boundary");
var zoom = d3.zoom().scaleExtent([1, 8]).translateExtent([[0, 0], [width, height]]).on("zoom", () => g.attr("transform", d3.event.transform));
svg.call(zoom);
window.onresize = () => {
width = window.innerWidth, height = window.innerHeight;
svg.attr("width", width).attr("height", height);
g.attr("width", width).attr("height", height);
projection.fitSize([width, height], topojson.feature(data, data.objects.polygons));
g.selectAll("path").attr("d", path);
zoom.translateExtent([[0, 0], [width, height]]);
svg.call(zoom);
}
});
</script>
</body>
</html>
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