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don't let users select areas bigger than allowed

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This commit is contained in:
Christopher Schmidt 2008-04-22 11:29:24 +00:00
parent adc823ce1b
commit 19a57c97b1
1 changed files with 32 additions and 13 deletions
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45
app/views/browse/start.rjs
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@ -7,19 +7,21 @@ page << <<EOJ
OpenLayers.Feature.Vector.style['default'].cursor = "pointer";
function start() {
openSidebar({ onclose: stopBrowse });
var vectors = new OpenLayers.Layer.Vector();
openSidebar({ onclose: stopBrowse });
var vectors = new OpenLayers.Layer.Vector();
box = new OpenLayers.Control.DrawFeature(vectors, OpenLayers.Handler.RegularPolygon, {
handlerOptions: {
sides: 4,
snapAngle: 90,
irregular: true,
persist: true,
callbacks: { done: endDrag }
}
});
map.addControl(box);
box = new OpenLayers.Control.DrawFeature(vectors, OpenLayers.Handler.RegularPolygon, {
handlerOptions: {
sides: 4,
snapAngle: 90,
irregular: true,
persist: true,
callbacks: { done: endDrag }
}
});
map.addControl(box);
map.events.register("moveend", map, validateLinks);
map.events.triggerEvent("moveend");
}
function stopBrowse() {
@ -35,6 +37,7 @@ page << <<EOJ
currentFeature.destroy();
currentFeature = null;
}
map.events.unregister("moveend", map, validateLinks);
}
function startDrag() {
@ -59,6 +62,7 @@ page << <<EOJ
getData(bounds);
$("drag_box").innerHTML = "Manually select a different area";
}
function displayFeatureWarning() {
var div = document.createElement("div");
var p = document.createElement("p");
@ -106,11 +110,17 @@ page << <<EOJ
}
function getData(bounds) {
$("status").innerHTML = "Loading...";
bounds.transform(new OpenLayers.Projection("EPSG:900913"), new OpenLayers.Projection("EPSG:4326"));
var size = bounds.getWidth() * bounds.getHeight();
if (size > 0.25) {
$("status").innerHTML = "Unable to load: Bounding box size of " + size + " is too large. (Must be smaller than 0.25)";
return;
}
var url = "/api/0.5/map?bbox="+bounds.toBBOX();
$("status").innerHTML = "Loading...";
if (!gml) {
var def = OpenLayers.Feature.Vector.style['default'];
var style = new OpenLayers.Style();
@ -257,6 +267,15 @@ page << <<EOJ
$("maxlon").innerHTML = Math.round(bounds.right * decimals) / decimals;
$("maxlat").innerHTML = Math.round(bounds.top * decimals) / decimals;
}
function validateLinks() {
var bounds = this.getExtent();
bounds = bounds.clone().transform(map.getProjectionObject(), epsg4326);
if (bounds.getWidth() * bounds.getHeight() > 0.25) {
$("use_map").style.display = "none";
} else {
$("use_map").style.display = "inline";
}
}
start();
EOJ