138 lines
3.3 KiB
JavaScript
138 lines
3.3 KiB
JavaScript
goog.require('ol.Feature');
|
|
goog.require('ol.Map');
|
|
goog.require('ol.Overlay');
|
|
goog.require('ol.View2D');
|
|
goog.require('ol.geom.LineString');
|
|
goog.require('ol.geom.Point');
|
|
goog.require('ol.layer.Vector');
|
|
goog.require('ol.source.Vector');
|
|
goog.require('ol.style.Circle');
|
|
goog.require('ol.style.Fill');
|
|
goog.require('ol.style.Stroke');
|
|
goog.require('ol.style.Style');
|
|
|
|
|
|
var count = 20000;
|
|
var features = new Array(count);
|
|
var e = 18000000;
|
|
for (var i = 0; i < count; ++i) {
|
|
features[i] = new ol.Feature({
|
|
'geometry': new ol.geom.Point(
|
|
[2 * e * Math.random() - e, 2 * e * Math.random() - e]),
|
|
'i': i,
|
|
'size': i % 2 ? 10 : 20
|
|
});
|
|
}
|
|
|
|
var styles = {
|
|
'10': [new ol.style.Style({
|
|
image: new ol.style.Circle({
|
|
radius: 5,
|
|
fill: new ol.style.Fill({color: '#666666'}),
|
|
stroke: new ol.style.Stroke({color: '#bada55', width: 1})
|
|
})
|
|
})],
|
|
'20': [new ol.style.Style({
|
|
image: new ol.style.Circle({
|
|
radius: 10,
|
|
fill: new ol.style.Fill({color: '#666666'}),
|
|
stroke: new ol.style.Stroke({color: '#bada55', width: 1})
|
|
})
|
|
})]
|
|
};
|
|
|
|
var vectorSource = new ol.source.Vector({
|
|
features: features
|
|
});
|
|
var vector = new ol.layer.Vector({
|
|
source: vectorSource,
|
|
style: function(feature, resolution) {
|
|
return styles[feature.get('size')];
|
|
}
|
|
});
|
|
|
|
var popup = new ol.Overlay({
|
|
element: document.getElementById('popup')
|
|
});
|
|
|
|
var map = new ol.Map({
|
|
layers: [vector],
|
|
target: document.getElementById('map'),
|
|
view: new ol.View2D({
|
|
center: [0, 0],
|
|
zoom: 2
|
|
}),
|
|
overlays: [popup]
|
|
});
|
|
|
|
var point = null;
|
|
var line = null;
|
|
var displaySnap = function(coordinate) {
|
|
var closestFeature = vectorSource.getClosestFeatureToCoordinate(coordinate);
|
|
if (closestFeature === null) {
|
|
point = null;
|
|
line = null;
|
|
} else {
|
|
var geometry = closestFeature.getGeometry();
|
|
var closestPoint = geometry.getClosestPoint(coordinate);
|
|
if (point === null) {
|
|
point = new ol.geom.Point(closestPoint);
|
|
} else {
|
|
point.setCoordinates(closestPoint);
|
|
}
|
|
if (line === null) {
|
|
line = new ol.geom.LineString([coordinate, closestPoint]);
|
|
} else {
|
|
line.setCoordinates([coordinate, closestPoint]);
|
|
}
|
|
}
|
|
map.render();
|
|
};
|
|
|
|
$(map.getViewport()).on('mousemove', function(evt) {
|
|
var coordinate = map.getEventCoordinate(evt.originalEvent);
|
|
displaySnap(coordinate);
|
|
});
|
|
|
|
map.on('click', function(evt) {
|
|
displaySnap(evt.coordinate);
|
|
});
|
|
|
|
var imageStyle = new ol.style.Circle({
|
|
radius: 10,
|
|
fill: null,
|
|
stroke: new ol.style.Stroke({
|
|
color: 'rgba(255,255,0,0.9)',
|
|
width: 3
|
|
})
|
|
});
|
|
var strokeStyle = new ol.style.Stroke({
|
|
color: 'rgba(255,255,0,0.9)',
|
|
width: 3
|
|
});
|
|
map.on('postcompose', function(evt) {
|
|
var vectorContext = evt.vectorContext;
|
|
if (point !== null) {
|
|
vectorContext.setImageStyle(imageStyle);
|
|
vectorContext.drawPointGeometry(point);
|
|
}
|
|
if (line !== null) {
|
|
vectorContext.setFillStrokeStyle(null, strokeStyle);
|
|
vectorContext.drawLineStringGeometry(line);
|
|
}
|
|
});
|
|
|
|
$(map.getViewport()).on('mousemove', function(e) {
|
|
var pixel = map.getEventPixel(e.originalEvent);
|
|
|
|
var hit = map.forEachFeatureAtPixel(pixel, function(feature, layer) {
|
|
return true;
|
|
});
|
|
|
|
if (hit) {
|
|
map.getTarget().style.cursor = 'pointer';
|
|
} else {
|
|
map.getTarget().style.cursor = '';
|
|
}
|
|
});
|