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Snapping.html
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Snapping.html
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<html>
<head>
<script src="../../lib/OpenLayers.js"></script>
<script type="text/javascript">
function test_initialize(t) {
t.plan(5);
// construct with a single layer
var layer = new OpenLayers.Layer.Vector();
var control = new OpenLayers.Control.Snapping({
layer: layer
});
t.ok(control.layer === layer, "[a] source layer properly set");
t.eq(control.targets.length, 1, "[a] one target layer");
t.ok(control.targets[0].layer === layer, "[a] target set");
control.destroy();
// construct with a different target, default target config
var layer2 = new OpenLayers.Layer.Vector();
control = new OpenLayers.Control.Snapping({
layer: layer,
targets: [layer2]
});
t.eq(control.targets.length, 1, "[b] one target layer");
t.ok(control.targets[0].layer == layer2, "[b] target set");
control.destroy();
}
function test_setLayer(t) {
t.plan(4);
var layer = new OpenLayers.Layer.Vector();
var control = new OpenLayers.Control.Snapping();
control.setLayer(layer);
t.ok(control.layer === layer, "layer properly set");
// confirm that the control is deactivated and reactivated when setting new layer
var log = {
activated: 0,
deactivated: 0
};
control.activate = function() {
log.activated++;
}
control.deactivate = function() {
log.deactivated++;
}
control.active = true;
var layer2 = new OpenLayers.Layer.Vector();
control.setLayer(layer2);
t.eq(log.deactivated, 1, "control deactivated");
t.ok(control.layer === layer2, "layer properly reset");
t.eq(log.activated, 1, "control reactivated");
control.destroy();
}
function test_setTargets(t) {
t.plan(4);
var layer1 = new OpenLayers.Layer.Vector();
var layer2 = new OpenLayers.Layer.Vector();
var control = new OpenLayers.Control.Snapping();
var log = {
addTarget: [],
addTargetLayer: []
};
control.addTarget = function(target) {
log.addTarget.push(target);
};
control.addTargetLayer = function(target) {
log.addTargetLayer.push(target);
};
control.setTargets([layer1, {layer: layer2}]);
t.eq(log.addTargetLayer.length, 1, "setTargetLayer called once");
t.ok(log.addTargetLayer[0] === layer1, "setTargetLayer called with layer1");
t.eq(log.addTarget.length, 1, "setTarget called once");
t.ok(log.addTarget[0].layer === layer2, "setTarget called with layer2");
control.destroy();
}
function test_addTarget(t) {
t.plan(5);
var layer = new OpenLayers.Layer.Vector();
var control = new OpenLayers.Control.Snapping({
defaults: {
nodeTolerance: 30,
tolerance: 40
}
});
var log = {};
control.addTarget({layer: layer});
t.eq(control.targets.length, 1, "single target");
var target = control.targets[0];
t.ok(target.layer === layer, "correct target layer");
t.eq(target.nodeTolerance, 30, "correct nodeTolerance");
t.eq(target.edgeTolerance, 40, "correct edgeTolerance");
t.eq(target.vertexTolerance, 40, "correct vertexTolerance");
control.destroy();
}
function test_removeTargetLayer(t) {
t.plan(3);
var layer1 = new OpenLayers.Layer.Vector();
var layer2 = new OpenLayers.Layer.Vector();
var layer3 = new OpenLayers.Layer.Vector();
var control = new OpenLayers.Control.Snapping({
targets: [layer1, layer2, layer3]
});
control.removeTargetLayer(layer2);
t.eq(control.targets.length, 2, "correct targets length");
t.ok(control.targets[0].layer === layer1, "layer1 remains");
t.ok(control.targets[1].layer === layer3, "layer3 remains");
control.destroy();
}
function test_activate(t) {
t.plan(4);
var layer = new OpenLayers.Layer.Vector();
var control = new OpenLayers.Control.Snapping({
layer: layer
});
control.activate();
t.eq(layer.events.listeners.sketchmodified.length, 1, "one sketchmodified listener");
t.ok(layer.events.listeners.sketchmodified[0].func === control.onSketchModified, "correct sketchmodified listener");
t.eq(layer.events.listeners.vertexmodified.length, 1, "one vertexmodified listener");
t.ok(layer.events.listeners.vertexmodified[0].func === control.onVertexModified, "correct vertexmodified listener");
control.destroy();
}
function test_deactivate(t) {
t.plan(2);
var layer = new OpenLayers.Layer.Vector();
var control = new OpenLayers.Control.Snapping({
layer: layer
});
control.activate();
control.deactivate();
t.eq(layer.events.listeners.sketchmodified.length, 0, "no sketchmodified listeners");
t.eq(layer.events.listeners.vertexmodified.length, 0, "no vertexmodified listeners");
control.destroy();
}
function test_snapping(t) {
t.plan(46);
var map = new OpenLayers.Map("map", {
resolutions: [1],
maxExtent: new OpenLayers.Bounds(0, 0, 100, 100)
});
var layer1 = new OpenLayers.Layer.Vector(null, {
isBaseLayer: true
});
layer1.addFeatures([
new OpenLayers.Feature.Vector(OpenLayers.Geometry.fromWKT(
"LINESTRING(0 0, 10 10, 20 20, 30 30)"
)),
new OpenLayers.Feature.Vector(OpenLayers.Geometry.fromWKT(
"LINESTRING(11 10, 20 10, 30 10)"
))
]);
var layer2 = new OpenLayers.Layer.Vector();
layer2.addFeatures([
new OpenLayers.Feature.Vector(OpenLayers.Geometry.fromWKT(
"LINESTRING(10 10, 20 20, 30 30)"
)),
new OpenLayers.Feature.Vector(OpenLayers.Geometry.fromWKT(
"LINESTRING(21 10, 20 20, 20 30)"
))
]);
map.addLayers([layer1, layer2]);
map.zoomToMaxExtent();
var control = new OpenLayers.Control.Snapping({
layer: layer1,
targets: [layer1, layer2],
defaults: {tolerance: 4}
});
control.activate();
map.addControl(control);
// log beforesnap, snap, and unsnap events
var events = [];
function listener(event) {
events.push(event);
}
control.events.on({
beforesnap: listener,
snap: listener,
unsnap: listener
});
// create a vertex and a convenience method for mocking the drag
var vertex = new OpenLayers.Geometry.Point(-100, -100);
function drag(x, y) {
var px = map.getPixelFromLonLat(new OpenLayers.LonLat(x, y));
layer1.events.triggerEvent("vertexmodified", {
vertex: vertex, pixel: px
});
}
// mock up drag far from features
drag(-100, -100);
t.eq(events.length, 0, "no snapping");
// mock up drag near first node of first feature
drag(0, 1);
t.eq(events.length, 2, "[a] 2 events triggered");
t.eq(events[0].type, "beforesnap", "[a] beforesnap triggered");
t.eq(events[0].snapType, "node", "[a] beforesnap triggered for node");
t.ok(events[0].point === vertex, "[a] beforesnap triggered with vertex");
t.eq(events[0].x, 0, "[a] beforesnap triggered correct x");
t.eq(events[0].y, 0, "[a] beforesnap triggered with correct y");
t.eq(events[1].type, "snap", "[a] snap triggered");
t.eq(events[1].snapType, "node", "[a] snap triggered for node");
t.ok(events[1].point === vertex, "[a] snap triggered with point");
t.eq(events[1].distance, 1, "[a] snap triggered correct distance");
t.ok(events[1].layer === layer1, "[a] snap triggered with correct target layer");
t.eq(vertex.x, 0, "[a] vertex x modified");
t.eq(vertex.y, 0, "[a] vertex y modified");
events = [];
// mock up drag that unsnaps
drag(-100, -50);
t.eq(events.length, 1, "[b] 1 event triggered");
t.eq(events[0].type, "unsnap", "[b] unsnap triggered");
t.ok(events[0].point === vertex, "[b] unsnap triggered with vertex");
t.eq(vertex.x, -100, "[b] vertex x unsnapped");
t.eq(vertex.y, -50, "[b] vertex y unsnapped");
events = [];
// drag near node of second feature in first layer to demonstrate precedence of node snapping
drag(9, 10);
t.eq(events.length, 2, "[c] 2 events triggered");
t.eq(events[0].type, "beforesnap", "[c] beforesnap triggered first");
t.eq(events[1].type, "snap", "[c] snap triggered second");
t.eq(events[1].snapType, "node", "[c] snap to node");
// unsnap & reset
drag(-100, -50);
events = [];
// drag near node of second feature in second layer to demonstrate greedy property
// with greedy true (default) the best target from the first layer with eligible targets is used
drag(22, 10);
t.eq(events.length, 2, "[d] 2 events triggered");
t.eq(events[1].type, "snap", "[d] snap triggered second");
t.eq(events[1].snapType, "vertex", "[d] snap to vertex");
t.ok(events[1].layer === layer1, "[d] snap to vertex in first layer");
t.eq(vertex.x, 20, "[d] vertex x modified");
t.eq(vertex.y, 10, "[d] vertex y modified");
// unsnap & reset
drag(-100, -50);
events = [];
// do the same drag but with greedy false - this will look for best target in all layers
control.greedy = false;
drag(22, 10);
t.eq(events.length, 2, "[d] 2 events triggered");
t.eq(events[1].type, "snap", "[d] snap triggered second");
t.eq(events[1].snapType, "node", "[d] snap to node");
t.ok(events[1].layer === layer2, "[d] snap to node in second layer");
// unsnap & reset
drag(-100, -50);
control.greedy = true;
events = [];
// demonstrate snapping on sketchstarted
var p = new OpenLayers.Geometry.Point(0, 1);
layer1.events.triggerEvent("sketchstarted", {
vertex: p,
feature: new OpenLayers.Feature.Vector(p)
});
t.eq(events.length, 2, "[sketchstarted] 2 events triggered");
t.eq(events[0].type, "beforesnap", "[sketchstarted] beforesnap triggered");
t.eq(events[0].snapType, "node", "[sketchstarted] beforesnap triggered for node");
t.ok(events[0].point === p, "[sketchstarted] beforesnap triggered with vertex");
t.eq(events[0].x, 0, "[sketchstarted] beforesnap triggered correct x");
t.eq(events[0].y, 0, "[sketchstarted] beforesnap triggered with correct y");
t.eq(events[1].type, "snap", "[sketchstarted] snap triggered");
t.eq(events[1].snapType, "node", "[sketchstarted] snap triggered for node");
t.ok(events[1].point === p, "[sketchstarted] snap triggered with point");
t.eq(events[1].distance, 1, "[sketchstarted] snap triggered correct distance");
t.ok(events[1].layer === layer1, "[sketchstarted] snap triggered with correct target layer");
t.eq(p.x, 0, "[sketchstarted] vertex x modified");
t.eq(p.y, 0, "[sketchstarted] vertex y modified");
// reset
events = [];
map.destroy();
}
</script>
</head>
<body>
<div id="map" style="width: 100px; height: 100px;"></div>
</body>
</html>