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add displayProjection API Property on the Map, and on relevant controls.

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Spherical mercator example now makes use of this, displaying coordinates 
in lon/lat instead of meters, and permalink/argparser now work in lon/lat
as well. this functionality will make using SphericalMercator easier for
a number of applications. 
r=tschaub (Closes #1036)


git-svn-id: http://svn.openlayers.org/trunk/openlayers@5519 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
crschmidt
2007-12-19 23:36:34 +00:00
parent 811e35cff3
commit acc8cfc0f2
6 changed files with 117 additions and 14 deletions
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lib/OpenLayers/Control/Permalink.js
+36 -4
View File
@@ -25,6 +25,18 @@ OpenLayers.Control.Permalink = OpenLayers.Class(OpenLayers.Control, {
*/
base: '',
/**
* APIProperty: displayProjection
* {<OpenLayers.Projection>} Requires proj4js support. Projection used
* when creating the coordinates in the link. This will reproject the
* map coordinates into display coordinates. If you are using this
* functionality, the permalink which is last added to the map will
* determine the coordinate type which is read from the URL, which
* means you should not add permalinks with different
* displayProjections to the same map.
*/
displayProjection: null,
/**
* Constructor: OpenLayers.Control.Permalink
*
@@ -67,11 +79,20 @@ OpenLayers.Control.Permalink = OpenLayers.Class(OpenLayers.Control, {
for(var i=0; i< this.map.controls.length; i++) {
var control = this.map.controls[i];
if (control.CLASS_NAME == "OpenLayers.Control.ArgParser") {
// If a permalink is added to the map, and an ArgParser already
// exists, we override the displayProjection to be the one
// on the permalink.
if (control.displayProjection != this.displayProjection) {
this.displayProjection = control.displayProjection;
}
break;
}
}
if (i == this.map.controls.length) {
this.map.addControl(new OpenLayers.Control.ArgParser());
this.map.addControl(new OpenLayers.Control.ArgParser(
{ 'displayProjection': this.displayProjection }));
}
},
@@ -112,9 +133,20 @@ OpenLayers.Control.Permalink = OpenLayers.Class(OpenLayers.Control, {
var params = OpenLayers.Util.getParameters(this.base);
params.zoom = this.map.getZoom();
params.lat = Math.round(center.lat*100000)/100000;
params.lon = Math.round(center.lon*100000)/100000;
var lat = center.lat;
var lon = center.lon;
if (this.displayProjection) {
var mapPosition = OpenLayers.Projection.transform(
{ x: lon, y: lat },
this.map.getProjectionObject(),
this.displayProjection );
lon = mapPosition.x;
lat = mapPosition.y;
}
params.lat = Math.round(lat*100000)/100000;
params.lon = Math.round(lon*100000)/100000;
params.layers = '';
for(var i=0; i< this.map.layers.length; i++) {
var layer = this.map.layers[i];