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Adding a threshold property to the cluster strategy. If a threshold set, clusters will only be created if the number of features in a group meets or exceeds the threshold number. r=elemoine,crschmidt (closes #1815)

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@9119 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Tim Schaub
2009-03-23 17:34:28 +00:00
parent 85dc3a9880
commit 3e55ef6aa3
3 changed files with 193 additions and 11 deletions
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27
tests/Strategy/Cluster.html
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@@ -19,7 +19,7 @@
}
function test_clusters(t) {
t.plan(10);
t.plan(17);
function featuresEq(got, exp) {
var eq = false;
@@ -82,9 +82,28 @@
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)), "[2] second cluster includes second 21 features");
t.ok(featuresEq(layer.features[2].cluster, features.slice(42, 63)), "[2] third cluster includes third 21 features");
t.ok(featuresEq(layer.features[3].cluster, features.slice(63, 80)), "[2] fourth cluster includes last 17 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) {