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<html>
<head>
<script src="../OLLoader.js"></script>
<script type="text/javascript">
function test_activate(t) {
t.plan(2);
var strategy = new OpenLayers.Strategy.Cluster();
t.eq(strategy.active, false, "not active after construction");
var layer = new OpenLayers.Layer.Vector("Vector Layer", {
strategies: [strategy]
});
var map = new OpenLayers.Map('map');
map.addLayer(layer);
t.eq(strategy.active, true, "active after adding to map");
}
function test_clusters(t) {
t.plan(17);
function featuresEq(got, exp) {
var eq = false;
if(got instanceof Array && exp instanceof Array) {
if(got.length === exp.length) {
for(var i=0; i<got.length; ++i) {
if(got[i] !== exp[i]) {
console.log(got[i], exp[i]);
break;
}
}
eq = (i == got.length);
}
}
return eq;
}
var strategy = new OpenLayers.Strategy.Cluster();
var layer = new OpenLayers.Layer.Vector("Vector Layer", {
strategies: [strategy],
isBaseLayer: true
});
var map = new OpenLayers.Map('map', {
resolutions: [4, 2, 1],
maxExtent: new OpenLayers.Bounds(-40, -40, 40, 40)
});
map.addLayer(layer);
// create features in a line, 1 unit apart
var features = new Array(80);
for(var i=0; i<80; ++i) {
features[i] = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point(-40 + i, 0)
);
}
// add one additional feature, with no geometry - just to confirm it doesn't break things
features.push(new OpenLayers.Feature.Vector());
layer.addFeatures(features);
map.setCenter(new OpenLayers.LonLat(0, 0), 0);
// resolution 4
// threshold: 4 * 20 = 80 units
// one cluster
t.eq(layer.features.length, 1, "[4] layer has one cluster");
t.ok(featuresEq(layer.features[0].cluster, features.slice(0, 80)), "[4] cluster includes all features with geometries");
// resolution 2
// threshold: 2 * 20 = 40 units
// two clusters (41 and 39) - first cluster includes all features within 40 units of the first (0-40 or 41 features)
map.zoomIn();
t.eq(layer.features.length, 2, "[2] layer has two clusters");
t.ok(featuresEq(layer.features[0].cluster, features.slice(0, 41)), "[2] first cluster includes first 41 features");
t.ok(featuresEq(layer.features[1].cluster, features.slice(41, 80)), "[2] second cluster includes last 39 features");
// resolution 1
// threshold: 1 * 20 = 20 units
// four clusters (21, 21, 21, and 17)
map.zoomIn();
t.eq(layer.features.length, 4, "[1] layer has four clusters");
t.ok(featuresEq(layer.features[0].cluster, features.slice(0, 21)), "[1] first cluster includes first 21 features");
t.ok(featuresEq(layer.features[1].cluster, features.slice(21, 42)), "[1] second cluster includes second 21 features");
t.ok(featuresEq(layer.features[2].cluster, features.slice(42, 63)), "[1] third cluster includes third 21 features");
t.ok(featuresEq(layer.features[3].cluster, features.slice(63, 80)), "[1] fourth cluster includes last 17 features");
// zoom out and back in to test threshold property (21)
map.zoomOut();
strategy.threshold = 21;
map.zoomIn();
t.eq(layer.features.length, 20, "[1-threshold 21] layer has 20 clusters");
t.ok(featuresEq(layer.features[0].cluster, features.slice(0, 21)), "[1-threshold 21] first cluster includes first 21 features");
t.ok(featuresEq(layer.features[1].cluster, features.slice(21, 42)), "[1-threshold 21] second cluster includes second 21 features");
t.ok(featuresEq(layer.features[2].cluster, features.slice(42, 63)), "[1-threshold 21] third cluster includes third 21 features");
t.ok(featuresEq(layer.features.slice(3, 20), features.slice(63, 80)), "[1-threshold 21] last 17 features are not clustered");
// zoom out and back in to test high threshold
map.zoomOut();
strategy.threshold = 100; // clusters must contain 100 features or more
map.zoomIn();
// the one feature with no geometry is not added to the layer
t.eq(layer.features.length, features.length-1, "[1-threshold 100] layer has " + (features.length-1) + " clusters");
t.ok(featuresEq(layer.features, features.slice(0, 80)), "[1-threshold 100] layer has all features with geometry");
}
function test_deactivate(t) {
t.plan(2);
var strategy = new OpenLayers.Strategy.Cluster();
var layer = new OpenLayers.Layer.Vector("Vector Layer", {
strategies: [strategy]
});
var map = new OpenLayers.Map('map');
map.addLayer(layer);
t.eq(strategy.active, true, "active after adding to map");
map.removeLayer(layer);
t.eq(strategy.active, false, "not active after removing from map");
}
</script>
</head>
<body>
<div id="map" style="width: 400px; height: 200px" />
</body>
</html>
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