topojsonファイルを使って日本地図を表示する作例。
使用ファイル:https://github.com/dataofjapan/land
地図出典元:地球地図日本
Created
May 29, 2014 15:08
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Japan TopoJSON
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<!DOCTYPE html> | |
<head> | |
<meta charset="utf-8"> | |
<title>Japan TopoJSON</title> | |
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
<script src="http://d3js.org/queue.v1.min.js" charset="utf-8"></script> | |
<script src="http://d3js.org/topojson.v1.min.js" charset="utf-8"></script> | |
<script src="http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script> | |
<style> | |
#map { | |
border:1px solid #999; | |
width:960px; | |
height:500px; | |
} | |
.d3-tip { | |
line-height: 1; | |
font-weight: bold; | |
padding: 10px; | |
background: rgba(0, 0, 0, 0.8); | |
color: #fff; | |
border-radius: 2px; | |
font-size: 10px; | |
} | |
.d3-tip:after { | |
box-sizing: border-box; | |
display: inline; | |
font-size: 10px; | |
width: 100%; | |
line-height: 1; | |
color: rgba(0, 0, 0, 0.8); | |
content: "\25BC"; | |
position: absolute; | |
text-align: center; | |
} | |
.d3-tip.n:after { | |
margin: -1px 0 0 0; | |
top: 100%; | |
left: 0; | |
} | |
</style> | |
</head> | |
<body> | |
<div id="map"></div> | |
<script> | |
/* -------------------- | |
変数定義 | |
-------------------- */ | |
var width = 960, | |
height = 500; | |
var tip; | |
/* -------------------- | |
描画のための準備 | |
-------------------- */ | |
/* 地図投影の指定 */ | |
var projection = d3.geo.mercator() | |
.scale(1000) | |
.center([139.883565, 36.565725]); | |
/* 地形データをSVGに変換するための入れ物 */ | |
var path = d3.geo.path() | |
.projection(projection); | |
/* 描画領域の指定 */ | |
var svg = d3.select("#map").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
/* ツールチップ */ | |
tip = d3.tip() | |
.attr('class', 'd3-tip') | |
.offset([-10, 0]) | |
.html(function(d) { | |
return d.properties.nam_ja; | |
}); | |
svg.call(tip); | |
/* -------------------- | |
データファイルの読み込み | |
-------------------- */ | |
queue() | |
.defer(d3.json, "japan.topojson") | |
.await(loadReady); | |
/* -------------------- | |
地図の描画 | |
-------------------- */ | |
function loadReady(_error, _topojson) { | |
if (_error){ console.log(_error); } | |
/* 描画用の変数定義 */ | |
var geometries = topojson.feature(_topojson, _topojson.objects.japan).features; | |
/* 描画 */ | |
var countries = svg.append("g").selectAll(".prefecture").data(geometries); | |
countries | |
.enter().insert("path") | |
.attr("class", "prefecture") | |
.attr("d", path) | |
.style("fill", "#999") | |
.style("stroke", "#FFF") | |
.style("stroke-width", "1px") | |
.on('mouseover', tip.show) | |
.on('mouseout', tip.hide); | |
} | |
</script> | |
</body> | |
</html> |
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