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contour.html
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contour.html
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<!doctype html>
<html>
<head>
<meta charset='utf-8'>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<title> Javascript绘制等值线</title>
<style>
*{
margin:0;
padding:0;
}
html,body {
height:100%;
}
#container {
position:relative;
height:100%;
}
#tips{
height:10%;
overflow:hidden;
}
#tips h2{
color:blue;
margin:20px;
}
#map_canvas {
height:90%;
width:100%;
}
</style>
<script src='https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js'></script>
<script src='Contour.js'></script>
<script src='diamond4.js'></script>
<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyAUKAs1-DrqpqSWrithelhbPXVFAQbxCCA&libraries=drawing&v=weekly">
</script>
<script type="text/javascript">
$(function(){
//initialize_map()
var latlng = new google.maps.LatLng(34.397, 115.644);
var myOptions = {
zoom: 6,
center: latlng,
mapTypeId: google.maps.MapTypeId.TERRAIN
};
window.map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
for(var lat=10; lat <= 80; lat += 2.5){
var flightPath = new google.maps.Polyline({
path: [new google.maps.LatLng(lat, 30), new google.maps.LatLng(lat, 160)],
strokeColor: "#666666",
strokeOpacity: 0.8,
strokeWeight: 1
});
flightPath.setMap(map);
}
for(var lon = 30; lon <=160; lon += 2.5){
var flightPath = new google.maps.Polyline({
path: [new google.maps.LatLng(10, lon), new google.maps.LatLng(80, lon)],
strokeColor: "#666666",
strokeOpacity: 0.8,
strokeWeight: 1
});
flightPath.setMap(map);
}
})
</script>
<script>
$(function(){
if (!window.FileReader){
$('#container').text('你的浏览器不支持拖放操作啊，同学!');
return;
}
$('#container').on({
'dragenter': function(){//处理拖动进入事件
//$(this).css({'border-style': 'dashed'});
},
'dragleave': function(){//处理拖动离开事件
//$(this).css({'border-style': 'solid'});
},
'dragover': function(){//处理拖动移动事件
return false;
},
'drop': function(evt){//处理释放事件
var file = evt.originalEvent.dataTransfer.files[0];
var reader = new FileReader();
reader.onload = function(e){
var diamond4file = diamond4(e.target.result);
var con = new Contour(diamond4file.data);
con.setContourLevel(diamond4file.levels);
var all_iso_line = con.track();
for(var i in all_iso_line){
var line = all_iso_line[i].path;
var apath = [];
for(var j=0; j< line.length; j++){
apath.push(new google.maps.LatLng(line[j].x, line[j].y) );
}
var flightPath = new google.maps.Polyline({
path: apath,
strokeColor: "#0000FF",
strokeOpacity: 1.0,
strokeWeight: 2
});
flightPath.setMap(map);
}
}
reader.readAsText(file);
return false;
}
})
})
</script>
</head>
<body>
<div id='container'>
<div id='tips'>
<h2>将Micaps第四类数据格式文件拖入下面的地图中，即可在地图上查看等值线</h2>
</div>
<div id='map_canvas'>
</div>
</div>
</body>
</html>