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protect px-lonlat translation from null values in default layer

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@1494 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
euzuro
2006-09-20 09:44:53 +00:00
parent 439ff9943e
commit c52e730378
1 changed files with 22 additions and 14 deletions
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lib/OpenLayers/Layer.js
+10 -2
View File
@@ -409,6 +409,8 @@ OpenLayers.Layer.prototype = {
* @type OpenLayers.LonLat * @type OpenLayers.LonLat
*/ */
getLonLatFromViewPortPx: function (viewPortPx) { getLonLatFromViewPortPx: function (viewPortPx) {
var lonlat = null;
if (viewPortPx != null) {
var size = this.map.getSize(); var size = this.map.getSize();
var center = this.map.getCenter(); var center = this.map.getCenter();
var res = this.map.getResolution(); var res = this.map.getResolution();
@@ -416,8 +418,10 @@ OpenLayers.Layer.prototype = {
var delta_x = viewPortPx.x - (size.w / 2); var delta_x = viewPortPx.x - (size.w / 2);
var delta_y = viewPortPx.y - (size.h / 2); var delta_y = viewPortPx.y - (size.h / 2);
return new OpenLayers.LonLat(center.lon + delta_x * res , lonlat = new OpenLayers.LonLat(center.lon + delta_x * res ,
center.lat - delta_y * res); center.lat - delta_y * res);
}
return lonlat;
}, },
/** /**
@@ -428,12 +432,16 @@ OpenLayers.Layer.prototype = {
* @type OpenLayers.Pixel * @type OpenLayers.Pixel
*/ */
getViewPortPxFromLonLat: function (lonlat) { getViewPortPxFromLonLat: function (lonlat) {
var px = null;
if (lonlat != null) {
var resolution = this.map.getResolution(); var resolution = this.map.getResolution();
var extent = this.map.getExtent(); var extent = this.map.getExtent();
return new OpenLayers.Pixel( px = new OpenLayers.Pixel(
Math.round(1/resolution * (lonlat.lon - extent.left)), Math.round(1/resolution * (lonlat.lon - extent.left)),
Math.round(1/resolution * (extent.top - lonlat.lat)) Math.round(1/resolution * (extent.top - lonlat.lat))
); );
}
return px;
}, },
/** /**