Simple map to demonstrate the visualisation of polygons with Leaflet
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JavaScript: Leaflet Polygon Example
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<!DOCTYPE html> | |
<html> | |
<head> | |
<title>Simple polygon visualisation</title> | |
<meta charset="utf-8" /> | |
<script src="http://cdn.leafletjs.com/leaflet-0.6.1/leaflet.js"></script> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<style> | |
@import url(http://cdn.leafletjs.com/leaflet-0.6.1/leaflet.css); | |
</style> | |
</head> | |
<body> | |
<div id="map" style="width: 960px; height: 500px"></div> | |
<script> | |
var map = L.map('map').setView([53, 20], 5); | |
var data_attrib = " | Data: <a href='http://www.openstreetmap.org/'>© OpenStreetMap </a>contributers | <a href='http://d3js.org/'>D3.js</a>" | |
var osm = L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {attribution: "Map: <a href='http://www.openstreetmap.org/'>© OpenStreetMap </a>contributers" + data_attrib}); | |
var esri = L.tileLayer('http://services.arcgisonline.com/ArcGIS/rest/services/World_Physical_Map/MapServer/tile/{z}/{y}/{x}.png', {attribution: "Map: <a href='http://www.arcgis.com/home/item.html?id=c4ec722a1cd34cf0a23904aadf8923a0'>ArcGIS - World Physical Map</a>" + data_attrib}); | |
var stamen = L.tileLayer('http://{s}.tile.stamen.com/toner/{z}/{x}/{y}.png', {attribution: "Map: <a href='http://maps.stamen.com/#toner/12/37.7706/-122.3782'>Stamen Design</a>" + data_attrib}).addTo(map); | |
var baseLayers = {"stamen": stamen, "OpenStreetMap":osm, "World Physical Map":esri}; | |
var overlays = {}; | |
d3.json("result.geojson", function(error, json) { | |
var polygons1 = []; | |
json.features.map(function(poly,i){ | |
if(poly.geometry.type=='MultiPolygon') | |
var polygon = L.multiPolygon(poly.geometry.coordinates.map(function(d){return mapPolygon(d)}), {color: '#f00', weight:'2px'}).addTo(map); | |
else if(poly.geometry.type=='Polygon') | |
var polygon = L.polygon(mapPolygon(poly.geometry.coordinates), {color: '#f00', weight:'2px'}).addTo(map); | |
//overlays["Polygon ("+poly.properties.GEN+")"] = polygon; | |
polygons1.push(polygon) | |
}) | |
overlays["Original Polygons"]=polygons1; | |
function mapPolygon(poly){ | |
return poly.map(function(line){return mapLineString(line)}) | |
} | |
function mapLineString(line){ | |
return line.map(function(d){return [d[1],d[0]]}) | |
} | |
}); | |
d3.json("result_smooth_0.1.geojson", function(error, json) { | |
var polygons2 = []; | |
json.features.map(function(poly,i){ | |
if(poly.geometry.type=='MultiPolygon') | |
var polygon = L.multiPolygon(poly.geometry.coordinates.map(function(d){return mapPolygon(d)}), {color: '#0f0', weight:'1px'}).addTo(map); | |
else if(poly.geometry.type=='Polygon') | |
var polygon = L.polygon(mapPolygon(poly.geometry.coordinates), {color: '#0f0', weight:'1px'}).addTo(map); | |
//overlays["Polygon ("+poly.properties.GEN+")"] = polygon; | |
polygons2.push(polygon) | |
}) | |
overlays["Smoothed Polygons"]=polygons2; | |
L.control.layers(baseLayers, overlays).addTo(map); | |
function mapPolygon(poly){ | |
return poly.map(function(line){return mapLineString(line)}) | |
} | |
function mapLineString(line){ | |
return line.map(function(d){return [d[1],d[0]]}) | |
} | |
}); | |
</script> | |
</body> | |
</html> |
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