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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Draw features example</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v4.6.5/build/ol.js"></script>
<script>
var raster;
var source;
var vector;
var map;
var typeSelect;
var draw;
var features = new ol.Collection();
var format = new ol.format.WKT();
var current_shape = "point";
var fill = new ol.style.Fill({
color: 'rgba(210, 122, 167,0.2)'
});
var stroke = new ol.style.Stroke({
color: '#B40404',
width: 2
});
var styles = [
new ol.style.Style({
image: new ol.style.Circle({
fill: fill,
stroke: stroke,
radius: 5
}),
fill: fill,
stroke: stroke
})
];
function addInteraction(shape) {
draw = new ol.interaction.Draw({
features: features,
type: /** @type {ol.geom.GeometryType} */ shape
});
map.addInteraction(draw);
}
/**
* Let user change the geometry type.
* @param {Event} e Change event.
*/
function createVector() {
vector = new ol.layer.Vector({
source: new ol.source.Vector({ features: features }),
style: styles
});
}
function toEPSG4326(element, index, array) {
element = element.getGeometry().transform('EPSG:3857', 'EPSG:4326');
}
function toEPSG3857(element, index, array) {
element = element.getGeometry().transform('EPSG:4326', 'EPSG:3857');
}
function selectGeom(shape) {
current_shape = shape;
map.removeInteraction(draw);
addInteraction(shape);
}
function init() {
// document.getElementById("missing_wkt").style.display = "block";
createVector();
raster = new ol.layer.Tile({
source: new ol.source.OSM()
});
features.on("add", function (e) {
restoreDefaultColors();
features.forEach(toEPSG4326);
document.getElementById('wktStringTextArea').value = format.writeFeatures(features.getArray(), { rightHanded: true });
features.forEach(toEPSG3857);
});
map = new ol.Map({
layers: [raster, vector],
target: 'map',
view: new ol.View({
center: [-11000000, 4600000],
zoom: 4
})
});
if (window.location && window.location.hash) {
loadWKTfromURIFragment(window.location.hash);
}
plotWKT();
selectGeom('Point');
}
function restoreDefaultColors() {
document.getElementById("wktStringTextArea").style.borderColor = "";
document.getElementById("wktStringTextArea").style.backgroundColor = "";
};
// Plot wkt string on map
function plotWKT() {
var new_feature;
wkt_string = document.getElementById("wktStringTextArea").value;
if (wkt_string == "") {
document.getElementById("wktStringTextArea").style.borderColor = "red";
document.getElementById("wktStringTextArea").style.backgroundColor = "#F7E8F3";
return;
} else {
try {
new_feature = format.readFeature(wkt_string);
} catch (err) {
}
}
if (!new_feature) {
document.getElementById("wktStringTextArea").style.borderColor = "red";
document.getElementById("wktStringTextArea").style.backgroundColor = "#F7E8F3";
return;
} else {
map.removeLayer(vector);
features.clear();
new_feature.getGeometry().transform('EPSG:4326', 'EPSG:3857');
features.push(new_feature);
}
vector = new ol.layer.Vector({
source: new ol.source.Vector({ features: features }),
style: styles
});
selectGeom(current_shape);
map.addLayer(vector);
derived_feature = features.getArray()[0];
extent = derived_feature.getGeometry().getExtent();
minx = derived_feature.getGeometry().getExtent()[0];
miny = derived_feature.getGeometry().getExtent()[1];
maxx = derived_feature.getGeometry().getExtent()[2];
maxy = derived_feature.getGeometry().getExtent()[3];
centerx = (minx + maxx) / 2;
centery = (miny + maxy) / 2;
map.setView(new ol.View({
center: [centerx, centery],
zoom: 8
}));
map.getView().fit(extent, map.getSize());
}
function clearMap() {
map.removeLayer(vector);
features.clear();
vector = new ol.layer.Vector({
source: new ol.source.Vector({ features: features }),
style: styles
});
selectGeom(current_shape);
map.addLayer(vector);
document.getElementById("wktStringTextArea").value = "";
restoreDefaultColors();
}
function loadWKTfromURIFragment(fragment) {
// remove first character from fragment as it contains '#'
var wkt = window.location.hash.slice(1);
document.getElementById("wktStringTextArea").value = decodeURI(wkt);
}
</script>
<!-- Place this tag in your head or just before your close body tag. -->
<script async defer src="https://buttons.github.io/buttons.js"></script>
<style>
@media only screen and (min-width: 1366px) {
.map { height: 400px !important}
}
@media only screen and (min-width: 1440px) {
.map { height: 500px !important}
}
@media only screen and (min-width: 1680px) {
.map { height: 650px !important}
}
@media only screen and (min-width: 1920px) {
.map { height: 700px !important}
}
@media only screen and (min-width: 2560px) {
.map { height: 1050px !important}
}
</style>
</head>
<body onload="init()">
<nav class="navbar navbar-expand-sm bg-dark navbar-dark" style="height: 40px;line-height: 0.5">
<a class="navbar-brand" href="#">OpenStreetMap WKT Playground</a>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="https://github.com/clydedacruz/openstreetmap-wkt-playground">Code</a>
</li>
<li class="nav-item">
<!-- Place this tag where you want the button to render. -->
<a class="github-button" href="https://github.com/clydedacruz/openstreetmap-wkt-playground" data-icon="octicon-star" data-size="large" data-show-count="true"
aria-label="Star clydedacruz/openstreetmap-wkt-playground on GitHub">Star</a>
</li>
</ul>
</nav>
<div class="container-fluid" style="padding: 0px; border:0px">
<div class="span12">
<div id="overlay" class="row align-items-center justify-content-center" style="background-color: transparent; z-index:1; position: absolute; top:280px; right:26px">
<div class="btn-group-vertical ">
<button type="button" class="btn btn-primary" onclick="selectGeom('Point')">Point</button>
<button type="button" class="btn btn-primary" onclick="selectGeom('LineString')">Line String</button>
<button type="button" class="btn btn-primary" onclick="selectGeom('Polygon')">Polygon</button>
</div>
</div>
<div id="map" class="map" style="z-index: 0"></div>
</div>
<div class="span12" style="padding: 10px; border:0px">
<textarea id="wktStringTextArea" class="form-control" rows="4" onclick="restoreDefaultColors()">
MULTIPOLYGON(((-108.72070312499997 34.99400375757577,-100.01953124999997 46.58906908309183,-90.79101562499996 34.92197103616377,-108.72070312499997
34.99400375757577),(-100.10742187499997 41.47566020027821,-102.91992187499996 37.61423141542416,-96.85546874999996
37.54457732085582,-100.10742187499997 41.47566020027821)),((-85.16601562499999 34.84987503195417,-80.771484375 28.497660832963476,-76.904296875
34.92197103616377,-85.16601562499999 34.84987503195417)))
</textarea>
<div class="btn-group btn-group-md" style="padding: 10px; position: absolute; right:0px">
<button type="button" class="btn btn-primary" onclick="clearMap()">Clear</button>
<button type="button" class="btn btn-primary" onclick="plotWKT()">Plot Shape</button>
</div>
</div>
</div>
</body>
</html>