Using some ideas extrapolated from here:
http://forevermore.net/photozoom/
I developed this code which works great:
function onMapLoad() {
map = new GMap2(document.getElementById("WellMap"));
map.setCenter(new GLatLng(47.563, -122.730385), 11);
map.addMapType(G_PHYSICAL_MAP);
map.setMapType(G_PHYSICAL_MAP);
map.addControl(new GSmallMapControl());
map.addControl(new GMapTypeControl());
for(var layer in layers) {
addTR(layer, layers[layer].name);
document.getElementById(layer).checked = layers[layer].checked;
toggleGeoXML(layer, layers[layer].checked);
}
function addGeoXML() {
var theUrl = document.getElementById("url").value;
theUrl = theUrl.replace(/^\s+/, "");
theUrl = theUrl.replace(/\s+$/, "");
if (theUrl.indexOf(' ') != -1) {
alert('Error - that address has a space in it');
} else {
var id = "userAdded" + userAdded;
layers[id] = {};
layers[id].url = theUrl;
layers[id].name = "User Layer " + userAdded;
addTR(id);
document.getElementById(id).checked = true;
toggleGeoXML(id, true);
userAdded++;
}
}
function addTR(id) {
var layerTR = document.createElement("tr");
var inputTD = document.createElement("td");
var input = document.createElement("input");
input.type = "checkbox";
input.id = id;
input.onclick = function () { toggleGeoXML(this.id, this.checked) };
inputTD.appendChild(input);
var nameTD = document.createElement("td");
var nameA = document.createElement("a");
nameA.href = layers[id].url;
var name = document.createTextNode(layers[id].name);
nameA.appendChild(name);
nameTD.appendChild(nameA);
layerTR.appendChild(inputTD);
layerTR.appendChild(nameTD);
document.getElementById("sidebarTBODY").appendChild(layerTR);
}
function toggleGeoXML(id, checked) {
if (checked) {
var geoXml = new GGeoXml(layers[id].url);
layers[id].geoXml = geoXml;
var C = map.getCenter();
var mapzoom = map.getZoom();
if (layers[id].zoom) {
var new_zoom=(layers[id].zoom)
if (new_zoom > mapzoom) map.setZoom(layers[id].zoom);
}
else {map.setZoom(mapzoom);
}
if (layers[id].lat && layers[id].lng) {
var centerlng= C.lng();
var centerlat= C.lat();
var maptotal = centerlat + centerlng;
var newtotal=layers[id].lat+layers[id].lng;
}else {map.setCenter(new GLatLng(centerlat,centerlng))}
if (newtotal != -75.167385){
map.setCenter(new GLatLng(layers[id].lat, layers[id].lng));
} else {map.setCenter(new GLatLng(centerlat,centerlng));}
if (layers[id].map) {
var nowmap= map.getCurrentMapType();}
else{map.setMapType(G_NORMAL_MAP);}
if (nowmap!=G_NORMAL_MAP){
map.setMapType(layers[id].map);
} else{map.setMapType(G_NORMAL_MAP);}
map.addOverlay(geoXml);
}else if (layers[id].geoXml) {
map.removeOverlay(layers[id].geoXml);
}}
}
On Feb 26, 8:31 am, Dommer <[email protected]> wrote:
> I could use a few pointers, just to get an idea on where to start with
> this problem.
>
> My map: http://freeforthepicking.com/WaterResources/WaterResourcesMap.html
>
> Essentially, when you click on a polygon, things go great.
>
> When you click on 2 polygons, it defaults to the zoom settings of the
> polygon you clicked last. So, if you had already zoomed in to a
> property in footprints and then you added another layer you had lost
> all of that zooming.
>
> What I need to do is have the map check the current map settings, if
> the center isn't the default map center; don't change it. If the zoom
> level for the map the user checks is lower than the present zoom
> level, don't change the zoom level.
>
> What functions can I use to get the mapper to do checks like this of
> the state of the map before deciding whether or not to perform a
> function like zooming out or changing the map center?
>
> Thanks in advance.
> Help me out and get a cookie!
>
> Dominic
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