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worldmap.html
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>World Map</title>
<style>
.map_path {
stroke: black;
stroke-width: 1;
}
.grid_path{
stroke: gray;
stroke-width: 1;
fill:white;
opacity: 1;
}
</style>
<!-- Bootstrap core CSS -->
<link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="row">
<div class="panel panel-success">
<div class="panel-heading">
<h3 class="panel-title">世界地图</h3>
</div>
<div class="panel-body">
<div class="col-sm-8">
<div id="map"></div>
</div>
<div class="col-sm-4">
<form role="form">
<div class="form-group">
<label>投影</label>
<select class="form-control" id="select-map-projection">
<option value="1">墨卡托投影（等角正切圆柱投影）</option>
<option value="2">方位角直角投影</option>
<option value="3">圆锥正形投影</option>
<option value="4">方位角立体投影</option>
<option value="5">等角投影（普通圆柱投影）</option>
<option value="6">球心投影</option>
<option value="7">横向墨卡托投影</option>
</select>
</div>
<div class="form-group">
<label>比例尺<font style="color: gray">（设置不同的比例尺，获取更好的展示效果）</font></label>
<input id="map-scale" class="form-control" value="150"/>
</div>
<div class="form-group pull-right">
<button id="btn-draw-map" type="button" class="btn btn-lg btn-success" >绘制</button>
</div>
</form>
</div>
</div>
</div>
</div>
</div>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
function drawEarth ( projection ){
var width = 754; var height = 754;
var svg = d3.select("#map").append("svg")
.attr("width", width)
.attr("height", height);
var graticule = d3.geoGraticule();
var path = d3.geoPath()
.projection(projection);
d3.json("world.json", function(error, root) {
if (error)
return console.error(error);
var grid = graticule();
var map = svg.append("g")
.attr("transform", "translate(" + -100 + "," + 40 + ")");
map.append("path")
.datum( grid )
.attr("id","grid_id")
.attr("class","grid_path")
.attr("d",path);
map.selectAll(".map_path")
.data( root.features )
.enter()
.append("path")
.attr("class","map_path")
.attr("fill",function(d,i){
return "#81DBC6";
}).attr("d", path );
});
}
$(document).ready(function(){
drawEarth(d3.geoMercator().scale(120));
$("#btn-draw-map").click(function () {
var selprojection = $("#select-map-projection").children('option:selected').val();
var mapScale = parseInt($("#map-scale").val());
var projection = null;
switch (parseInt(selprojection)){
case 1:
projection = d3.geoMercator().scale(mapScale);
break;
case 2:
projection = d3.geoOrthographic().scale(mapScale);
break;
case 3:
projection = d3.geoConicConformal().scale(mapScale);
break;
case 4:
projection = d3.geoStereographic().scale(mapScale);
break;
case 5:
projection = d3.geoEquirectangular().scale(mapScale);
break;
case 6:
projection = d3.geoGnomonic().scale(mapScale);
break;
case 7:
projection = d3.geoTransverseMercator().scale(mapScale);
break;
}
$("#map").empty();
if ( projection != null){
drawEarth(projection);
}
});
});
</script>
</body>
</html>