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fix openlayers centre bug #234

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merged 2 commits into from
Sep 14, 2016
Merged

fix openlayers centre bug #234

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c7f2c5d
fix openlayers centre bug
PeterTheOne Sep 14, 2016
91370b6
remove unused code
PeterTheOne Sep 14, 2016
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43 changes: 11 additions & 32 deletions includes/services/OpenLayers/jquery.openlayers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@

this.map = null;
this.options = options;
this.bounds = null;

OpenLayers._getScriptLocation = function() {
return mw.config.get('wgScriptPath') + '/extensions/Maps/includes/services/OpenLayers/OpenLayers/';
Expand Down Expand Up @@ -60,10 +61,9 @@
}

var locations = options.locations;
var bounds = null;

if (locations.length > 1 && ( options.centre === false || options.zoom === false )) {
bounds = new OpenLayers.Bounds();
this.bounds = new OpenLayers.Bounds();
}

this.groupLayers = new Object();
Expand All @@ -73,7 +73,7 @@
this.addMarker( locations[i] );
}

if (bounds != null) map.zoomToExtent(bounds); // If a bounds object has been created, use it to set the zoom and center.
if (this.bounds != null) map.zoomToExtent(this.bounds); // If a bounds object has been created, use it to set the zoom and center.
};

this.addMarker = function (markerData) {
Expand All @@ -100,6 +100,7 @@
markerData.lonlat.transform(new OpenLayers.Projection("EPSG:4326"), new OpenLayers.Projection("EPSG:900913"));
}

if (this.bounds != null) this.bounds.extend(markerData.lonlat); // Extend the bounds when no center is set.
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The way I'm reading this code is that the bounds will get extended every time a marker is added. Is that incorrect?

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That's how I understand it too and it's correct.

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Does this mean that once the map has been fully loaded, and some event is causing addMarker to be called, the map will re-zoom and re-center?

(I don't really recall how the bounds stuff works, and if this rezoom and re-center happens if something gets added to it or if you need to make another call somewhere)

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I guess. I tried to provoke something like this with the SemanticMaps ajax feature (which only loads and adds points that are within current bounds), but it worked fine.

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Ok, going to trust you used the right incantations then

var marker = this.getOLMarker(curLayer, markerData);
this.markers.push({
target:marker,
Expand Down Expand Up @@ -292,7 +293,7 @@
this.text( '' );

/**
* ToDo: That layers being created by 'eval' will deny us the possiblity to
* ToDo: That layers being created by 'eval' will deny us the possibility to
* set certain options. It's possible to set properties of course but they will
* show no effect since they are not passed as options to the constructor.
* With this working we could adjust max/minScale to display overlays independent
Expand Down Expand Up @@ -368,8 +369,7 @@
else if ( options.locations.length == 0 ) {
centre = new OpenLayers.LonLat( 0, 0 );
}
}
else { // When the center is provided, set it.
} else { // When the center is provided, set it.
centre = new OpenLayers.LonLat( options.centre.lon, options.centre.lat );
}

Expand All @@ -379,8 +379,10 @@
new OpenLayers.Projection( "EPSG:4326" ),
new OpenLayers.Projection( "EPSG:900913" )
);
map.setCenter( centre );
} else {
map.zoomToMaxExtent();
}
map.setCenter( centre );
}

if ( options.zoom !== false ) {
Expand Down Expand Up @@ -469,7 +471,7 @@
'strokeOpacity':feature.attributes.strokeOpacity,
'fillColor':feature.attributes.fillColor,
'fillOpacity':feature.attributes.fillOpacity
}
};
_this.polygonLayer.drawFeature(feature, style);
}
},
Expand All @@ -481,7 +483,7 @@
'strokeOpacity':0,
'fillColor':feature.attributes.fillColor,
'fillOpacity':0
}
};
_this.polygonLayer.drawFeature(feature, style);
}
},
Expand Down Expand Up @@ -572,29 +574,6 @@
map.zoomTo(options.zoom);
}

if (options.centre === false) {
if (options.locations.length == 1) {
centre = new OpenLayers.LonLat(options.locations[0].lon, options.locations[0].lat);
}
else if (options.locations.length == 0) {
centre = new OpenLayers.LonLat(0, 0);
}
}
else { // When the center is provided, set it.
centre = new OpenLayers.LonLat(options.centre.lon, options.centre.lat);
}

if (centre !== false) {
if (!hasImageLayer) {
centre.transform(new OpenLayers.Projection("EPSG:4326"), new OpenLayers.Projection("EPSG:900913"));
map.setCenter(centre);
} else {
map.zoomToMaxExtent();
}
}



if (options.copycoords) {
map.div.oncontextmenu = function () {
return false;
Expand Down