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Have NavigationHistory control deal with reprojection, r=ahocevar (closes #1997)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@10261 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
bartvde
2010-04-30 14:52:38 +00:00
parent 0bb5ab8191
commit dc4d5036e4
2 changed files with 61 additions and 3 deletions
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22
lib/OpenLayers/Control/NavigationHistory.js
View File

@@ -294,7 +294,10 @@ OpenLayers.Control.NavigationHistory = OpenLayers.Class(OpenLayers.Control, {
getState: function() {
return {
center: this.map.getCenter(),
resolution: this.map.getResolution()
resolution: this.map.getResolution(),
projection: this.map.getProjectionObject(),
units: this.map.getProjectionObject().getUnits() ||
this.map.units || this.map.baseLayer.units
};
},
@@ -306,8 +309,21 @@ OpenLayers.Control.NavigationHistory = OpenLayers.Class(OpenLayers.Control, {
* state - {Object} An object representing the state to restore.
*/
restore: function(state) {
var zoom = this.map.getZoomForResolution(state.resolution);
this.map.setCenter(state.center, zoom);
var center, zoom;
if (this.map.getProjectionObject() == state.projection) {
zoom = this.map.getZoomForResolution(state.resolution);
center = state.center;
} else {
center = state.center.clone();
center.transform(state.projection, this.map.getProjectionObject());
var sourceUnits = state.units;
var targetUnits = this.map.getProjectionObject().getUnits() ||
this.map.units || this.map.baseLayer.units;
var resolutionFactor = sourceUnits && targetUnits ?
OpenLayers.INCHES_PER_UNIT[sourceUnits] / OpenLayers.INCHES_PER_UNIT[targetUnits] : 1;
zoom = this.map.getZoomForResolution(resolutionFactor*state.resolution);
}
this.map.setCenter(center, zoom);
},
/**

42
tests/Control/NavigationHistory.html
View File

@@ -195,6 +195,48 @@
control.destroy();
}
function test_reprojection(t) {
t.plan(2);
var map = new OpenLayers.Map("map");
var layer = new OpenLayers.Layer(
"test", {isBaseLayer: true}
);
map.addLayer(layer);
map.zoomToMaxExtent();
var control = new OpenLayers.Control.NavigationHistory();
map.addControl(control);
map.zoomTo(4);
var bounds = map.getExtent().clone();
var expected = bounds.transform(new OpenLayers.Projection('EPSG:4326'),
new OpenLayers.Projection('EPSG:900913'));
// change the projection to EPSG:900913
var projSettings = {
units: "m",
maxExtent: new OpenLayers.Bounds(-20037508, -20037508, 20037508, 20037508),
maxResolution: 156543.0339
};
map.setOptions(projSettings);
map.projection = 'EPSG:900913';
delete projSettings.maxResolution;
projSettings.projection = new OpenLayers.Projection('EPSG:900913');
layer.addOptions(projSettings);
layer.initResolutions();
map.zoomTo(7);
// go back one in the history
control.previous.trigger();
t.eq(map.getExtent().left.toFixed(3), expected.left.toFixed(3), "The extent [left] is reprojected correctly");
t.eq(map.getExtent().right.toFixed(3), expected.right.toFixed(3), "The extent [right] is reprojected correctly");
// top and bottom cannot be checked here since in EPSG:900913 the extent is not a rectangle so they are adjusted.
control.destroy();
}
</script>
</head>
<body>