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Formats now support reprojection using internalProjection and

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externalProjection properties. These allow for the reprojection of data --
OpenLayers users with SphericalMercator get this built in for EPSG:900913, and
other users can use the external proj4js library available from MapBuilder SVN
to add support for any number of projections. This means that featres can be,
for example, transformed from a KML doc in 4326 to Spherical Mercator before
being added to a layer, making using SphericalMercator slightly more enticing. 
r=elemoine
(Closes #1039)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@5516 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
crschmidt
2007-12-19 22:07:12 +00:00
parent 7440556585
commit 6d6c08fbef
8 changed files with 128 additions and 11 deletions
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49
examples/vector-formats.html
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@@ -55,6 +55,32 @@
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
var map, vectors, formats;
function updateFormats() {
var in_options = {
'internalProjection': map.baseLayer.projection,
'externalProjection': new OpenLayers.Projection(OpenLayers.Util.getElement("inproj").value)
}
var out_options = {
'internalProjection': map.baseLayer.projection,
'externalProjection': new OpenLayers.Projection(OpenLayers.Util.getElement("outproj").value)
}
formats = {
'in': {
wkt: new OpenLayers.Format.WKT(in_options),
geojson: new OpenLayers.Format.GeoJSON(in_options),
georss: new OpenLayers.Format.GeoRSS(in_options),
gml: new OpenLayers.Format.GML(in_options),
kml: new OpenLayers.Format.KML(in_options)
},
'out': {
wkt: new OpenLayers.Format.WKT(out_options),
geojson: new OpenLayers.Format.GeoJSON(out_options),
georss: new OpenLayers.Format.GeoRSS(out_options),
gml: new OpenLayers.Format.GML(out_options),
kml: new OpenLayers.Format.KML(out_options)
}
};
}
function init(){
map = new OpenLayers.Map('map');
var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
@@ -73,14 +99,8 @@
var select = new OpenLayers.Control.SelectFeature(vectors, options);
map.addControl(select);
select.activate();
formats = {
wkt: new OpenLayers.Format.WKT(),
geojson: new OpenLayers.Format.GeoJSON(),
georss: new OpenLayers.Format.GeoRSS(),
gml: new OpenLayers.Format.GML(),
kml: new OpenLayers.Format.KML()
};
updateFormats();
map.setCenter(new OpenLayers.LonLat(0, 0), 1);
}
@@ -89,7 +109,7 @@
var type = document.getElementById("formatType").value;
// second argument for pretty printing (geojson only)
var pretty = document.getElementById("prettyPrint").checked;
var str = formats[type].write(feature, pretty);
var str = formats['out'][type].write(feature, pretty);
// not a good idea in general, just for this demo
str = str.replace(/,/g, ', ');
document.getElementById('output').value = str;
@@ -98,7 +118,7 @@
function deserialize() {
var element = document.getElementById('text');
var type = document.getElementById("formatType").value;
var features = formats[type].read(element.value);
var features = formats['in'][type].read(element.value);
var bounds;
if(features) {
if(features.constructor != Array) {
@@ -164,6 +184,15 @@
<input id="prettyPrint" type="checkbox"
name="prettyPrint" value="1" />
<br />
Input Projection: <select id="inproj" onchange='updateFormats()'>
<option value="EPSG:4326" selected="selected">EPSG:4326</option>
<option value="EPSG:900913">Spherical Mercator</option>
</select> <br />
Output Projection: <select id="outproj" onchange='updateFormats()'>
<option value="EPSG:4326" selected="selected">EPSG:4326</option>
<option value="EPSG:900913">Spherical Mercator</option>
</select>
<br />
<textarea id="text">paste text here...</textarea>
<br />
<input type="button" value="add feature" onclick="deserialize();" />