topojsonファイルを使って東京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
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Tokyo 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(55000) | |
| .center([139.463191, 35.710335]); | |
| /* 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.ward_ja; | |
| }); | |
| svg.call(tip); | |
| /* -------------------- | |
| データファイルの読み込み | |
| -------------------- */ | |
| queue() | |
| .defer(d3.json, "tokyo.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.tokyo).features; | |
| /* 描画 */ | |
| var countries = svg.append("g").selectAll(".ward").data(geometries); | |
| countries | |
| .enter().insert("path") | |
| .attr("class", "ward") | |
| .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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