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New private movePyPx method to avoid going through all the unnecessary pixel-lonlat conversions. p=elemoine,me (closes #3062)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@11535 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
ahocevar
2011-02-25 18:02:12 +00:00
parent 4c40f7c11f
commit 2d5f29c55e
5 changed files with 262 additions and 59 deletions
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lib/OpenLayers/Layer.js
+21 -15
View File
@@ -569,6 +569,17 @@ OpenLayers.Layer = OpenLayers.Class({
this.display(display);
},
/**
* Method: moveByPx
* Move the layer based on pixel vector. To be implemented by subclasses.
*
* Parameters:
* dx - {Number} The x coord of the displacement vector.
* dy - {Number} The y coord of the displacement vector.
*/
moveByPx: function(dx, dy) {
},
/**
* Method: setMap
* Set the map property for the layer. This is done through an accessor
@@ -1201,22 +1212,17 @@ OpenLayers.Layer = OpenLayers.Class({
*/
getLonLatFromViewPortPx: function (viewPortPx) {
var lonlat = null;
if (viewPortPx != null) {
var size = this.map.getSize();
var center = this.map.getCenter();
if (center) {
var res = this.map.getResolution();
var delta_x = viewPortPx.x - (size.w / 2);
var delta_y = viewPortPx.y - (size.h / 2);
lonlat = new OpenLayers.LonLat(center.lon + delta_x * res ,
center.lat - delta_y * res);
var map = this.map;
if (viewPortPx != null && map.minPx) {
var res = map.getResolution();
var maxExtent = map.getMaxExtent();
var lon = (viewPortPx.x - map.minPx.x) * res + maxExtent.left;
var lat = (map.minPx.y - viewPortPx.y) * res + maxExtent.top;
lonlat = new OpenLayers.LonLat(lon, lat);
if (this.wrapDateLine) {
lonlat = lonlat.wrapDateLine(this.maxExtent);
}
} // else { DEBUG STATEMENT }
if (this.wrapDateLine) {
lonlat = lonlat.wrapDateLine(this.maxExtent);
}
}
return lonlat;
},