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/* layers */
var default_pointer = "/media/images/default-pointer.png";
var marker_cluster = "/media/images/marker-cluster.png";
var view_projection = 'EPSG:3857';
var map_default_center = 'SRID=4326;POINT (2.4397 46.5528)';
var map_default_zoom = '7';
var source_osm = function(options){
return new ol.layer.Tile({
source: new ol.source.OSM()
});
};
var default_map_layers = {
'osm': source_osm
};
var get_layers = function(layers){
if (!layers){
layers = [{'type': 'osm', 'options': null}];
}
var ol_layers = [];
for (idx in layers){
var layer_attr = layers[idx];
ol_layers.push(
default_map_layers[layer_attr['type']](layer_attr['options'])
);
}
return ol_layers;
};
/* get markers */
var get_markers = function(points){
};
/* styles */
var get_style = function(feature){
return new ol.style.Style({
image: new ol.style.Icon({
anchor: [17, 50],
anchorXUnits: 'pixels',
anchorYUnits: 'pixels',
size: [35, 50],
src: static_path + default_pointer
})
});
};
/* clustering */
var invisible_style_icon;
var _styleCache;
var _remindOldStyle;
var _remindUpdated;
var _currentRemind;
var _revision = 1;
var cluster_source;
var cluster_layer;
var enable_clustering = function(){
if (!invisible_style_icon){
invisible_style_icon = new ol.style.Style({
image: new ol.style.Icon({
//still need something even if it's invisible
src : static_path + marker_cluster,
opacity : 0
})
});
}
// Style clusters and hide items inside clusters
_styleCache = {};
_remindOldStyle = {};
_remindUpdated = {};
_currentRemind = -1;
function cluster_get_style (feature, resolution){
feature.set('key', 'cluster');
var features = feature.get('features');
var size = features.length;
feature.set('size', size);
var style = _styleCache[size];
// no cluster for lonely marker
if (!style && size > 1){
var color = size > 25 ? "192,0,0" : size > 8 ? "255,128,0" : "0,128,0";
var radius = Math.max(8, Math.min(size * 0.75, 20));
var lbl = size.toString();
style = _styleCache[size] = [
new ol.style.Style({
image: new ol.style.Circle({
radius: radius,
stroke: new ol.style.Stroke({
color:"rgba("+color+",0.5)",
width:15
}),
fill: new ol.style.Fill({
color:"rgba("+color+",1)"
})
}),
text: new ol.style.Text({
text: lbl,
fill: new ol.style.Fill({
color: '#fff'
})
})
})
];
}
// don't reapply the style when no modif have been opered
if (_currentRemind != _revision){
_remindUpdated = [];
_currentRemind = _revision;
}
if (size > 1){
// marker himself disappear
for (idx in features){
var feat = features[idx];
if (!_remindUpdated[feat.getProperties()['id']]){
if (!_remindOldStyle[feat.getProperties()['id']]){
_remindOldStyle[feat.getProperties()['id']] = feat.getStyle();
}
feat.setStyle(invisible_style_icon);
_remindUpdated[feat.getProperties()['id']] = 1;
}
}
} else {
// or re-appear
var feat = features[0];
if (!_remindUpdated[feat.getProperties()['id']] &&
_remindOldStyle[feat.getProperties()['id']]){
feat.setStyle(_remindOldStyle[feat.getProperties()['id']]);
_remindUpdated[feat.getProperties()['id']] = 1;
}
}
return style;
}
// Cluster Source
cluster_source = new ol.source.Cluster({
distance: 40,
source: new ol.source.Vector()
});
// Animated cluster layer
cluster_layer = new ol.layer.Vector({
name: 'Cluster',
source: cluster_source,
// Cluster style
style: cluster_get_style
});
map.addLayer(cluster_layer);
};
var reinit_clustering = function(){
cluster_source.getSource().clear();
_styleCache = {};
_remindOldStyle = {};
_remindUpdated = {};
_currentRemind = -1;
};
/* display map */
var vector_source;
var vector_layer;
var center;
var point_features;
var map;
var map_view;
var map_layers;
var proj_options = {
dataProjection:'EPSG:4326', featureProjection: view_projection
}
var geojson_format = new ol.format.GeoJSON(proj_options);
var wkt_format = new ol.format.WKT(proj_options);
var initialize_map = function(map_id, layers){
center = wkt_format.readGeometry(map_default_center).getCoordinates();
/*
vector_source = new ol.source.Vector({
features: geojson_format.readFeatures(points)
});
*/
vector_source = new ol.source.Vector();
vector_layer = new ol.layer.Vector({
source: vector_source,
style: get_style
});
map_layers = get_layers(layers);
map_layers.push(vector_layer);
map_view = new ol.View({
projection: view_projection,
center: ol.proj.fromLonLat([center[0], center[1]]),
zoom: map_default_zoom
});
map = new ol.Map({
target: map_id,
layers: map_layers,
view: map_view
});
}
var redraw_map = function(map_id, layers){
map.setTarget(null);
map = null;
initialize_map(map_id, layers);
};
var display_map = function(map_id, points, layers){
if (map){
redraw_map(map_id, layers);
} else {
initialize_map(map_id, layers);
}
point_features = geojson_format.readFeatures(points);
vector_source.clear();
vector_source.addFeatures(point_features);
map.updateSize();
if (points.features.length){
map_view.fit(vector_source.getExtent());
if (map_view.getZoom() > 12){
map_view.setZoom(12);
}
}
enable_clustering();
cluster_source.getSource().addFeatures(point_features);
}
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