1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
(function(){
OpenLayers.Protocol.Alloy = OpenLayers.Class(OpenLayers.Protocol.HTTP, {
currentRequests: [],
abort: function() {
if (this.currentRequests.length) {
for (var j = 0; j < this.currentRequests.length; j++) {
this.currentRequests[j].priv.abort();
}
this.currentRequests = [];
}
},
read: function(options) {
OpenLayers.Protocol.prototype.read.apply(this, arguments);
options = options || {};
options.params = OpenLayers.Util.applyDefaults(
options.params, this.options.params);
options = OpenLayers.Util.applyDefaults(options, this.options);
var all_tiles = this.getTileRange(options.scope.bounds, options.scope.layer.maxExtent, options.scope.layer.map);
var rresp;
var max = all_tiles.length;
options.scope.newRequest(max);
for (var i = 0; i < max; i++) {
var resp = new OpenLayers.Protocol.Response({requestType: "read"});
var url = this.getURL(all_tiles[i], options);
resp.priv = OpenLayers.Request.GET({
url: url, //options.url,
callback: this.createCallback(this.handleRead, resp, options),
params: options.params,
headers: options.headers
});
this.currentRequests.push(resp);
rresp = resp;
}
return rresp;
},
getURL: function(coords, options) {
return OpenLayers.String.format(options.base, {'layerid': options.layerid, 'environment': options.environment, 'layerVersion': options.layerVersion, 'z': 15, 'x': coords[0], 'y': coords[1]});
},
getTileRange: function(bounds, maxExtent, map) {
var min = this.getTileCoord([bounds.left, bounds.top], maxExtent, map, true);
var max = this.getTileCoord([bounds.right, bounds.bottom], maxExtent, map, false);
var coords = [];
for (var i = min[0], ii = max[0]; i <= ii; ++i) {
for (var j = min[1], jj = max[1]; j <= jj; ++j) {
coords.push([i,j]);
}
}
return coords;
},
getTileCoord: function(bounds, maxExtent, map, reverse) {
var origin = new OpenLayers.LonLat(maxExtent.left, maxExtent.top);
var resolution = map.getResolutionForZoom(3);
var adjustX = reverse ? 0.5 : 0;
var adjustY = reverse ? 0 : 0.5;
var xFromOrigin = Math.floor((bounds[0] - origin.lon) / resolution + adjustX);
var yFromOrigin = Math.floor((bounds[1] - origin.lat) / resolution + adjustY);
var tileCoordX = Math.floor(xFromOrigin / 512);
var tileCoordY = Math.floor(yFromOrigin / 512) * -1;
if (reverse) {
tileCoordX -= 1;
tileCoordY -= 1;
}
return [ tileCoordX, tileCoordY ];
}
});
OpenLayers.Strategy.Alloy = OpenLayers.Class(OpenLayers.Strategy.FixMyStreet, {
count: 0,
max: 0,
requestStart: 0,
initialize: function(name, options) {
OpenLayers.Strategy.FixMyStreet.prototype.initialize.apply(this, arguments);
},
newRequest: function(max) {
this.max = max;
this.count = 0;
this.failCount = 0;
this.layer.destroyFeatures();
},
merge: function(resp) {
this.count++;
// This if/else clause lifted from OpenLayers.Strategy.BBOX
if (resp.success()) {
var features = resp.features;
if(features && features.length > 0) {
var remote = this.layer.projection;
var local = this.layer.map.getProjectionObject();
if(!local.equals(remote)) {
var geom;
for(var i=0, len=features.length; i<len; ++i) {
geom = features[i].geometry;
if(geom) {
geom.transform(remote, local);
}
}
}
this.layer.addFeatures(features);
}
} else {
this.failCount++;
if (this.failCount >= this.max) {
this.bounds = null;
}
}
// only fire loadend things if we've got all the tiles
if (this.count == this.max) {
if ( this.layer.checkFeature ) {
this.layer.checkFeature(null, fixmystreet.get_lonlat_from_dom());
}
this.layer.events.triggerEvent("loadend", {response: resp});
}
},
});
fixmystreet.assets.alloy_defaults = {
http_options: {
base: "https://alloy-api-tile01.yotta.co.uk/api/render-layer/tile/${layerid}/${environment}/${layerVersion}/${z}/${x}/${y}",
},
format_class: OpenLayers.Format.GeoJSON,
srsName: "EPSG:3857",
strategy_class: OpenLayers.Strategy.Alloy
};
})();
|
