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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/Layer.js
*/
/**
* Class: OpenLayers.Layer.Markers
*
* Inherits from:
* - <OpenLayers.Layer>
*/
OpenLayers.Layer.Markers = OpenLayers.Class(OpenLayers.Layer, {
/**
* APIProperty: isBaseLayer
* {Boolean} Markers layer is never a base layer.
*/
isBaseLayer: false,
/**
* APIProperty: markers
* {Array(<OpenLayers.Marker>)} internal marker list
*/
markers: null,
/**
* Property: drawn
* {Boolean} internal state of drawing. This is a workaround for the fact
* that the map does not call moveTo with a zoomChanged when the map is
* first starting up. This lets us catch the case where we have *never*
* drawn the layer, and draw it even if the zoom hasn't changed.
*/
drawn: false,
/**
* Constructor: OpenLayers.Layer.Markers
* Create a Markers layer.
*
* Parameters:
* name - {String}
* options - {Object} Hashtable of extra options to tag onto the layer
*/
initialize: function(name, options) {
OpenLayers.Layer.prototype.initialize.apply(this, arguments);
this.markers = [];
},
/**
* APIMethod: destroy
*/
destroy: function() {
this.clearMarkers();
this.markers = null;
OpenLayers.Layer.prototype.destroy.apply(this, arguments);
},
/**
* APIMethod: setOpacity
* Sets the opacity for all the markers.
*
* Parameters:
* opacity - {Float}
*/
setOpacity: function(opacity) {
if (opacity != this.opacity) {
this.opacity = opacity;
for (var i=0, len=this.markers.length; i<len; i++) {
this.markers[i].setOpacity(this.opacity);
}
}
},
/**
* Method: moveTo
*
* Parameters:
* bounds - {<OpenLayers.Bounds>}
* zoomChanged - {Boolean}
* dragging - {Boolean}
*/
moveTo:function(bounds, zoomChanged, dragging) {
OpenLayers.Layer.prototype.moveTo.apply(this, arguments);
if (zoomChanged || !this.drawn) {
for(var i=0, len=this.markers.length; i<len; i++) {
this.drawMarker(this.markers[i]);
}
this.drawn = true;
}
},
/**
* APIMethod: addMarker
*
* Parameters:
* marker - {<OpenLayers.Marker>}
*/
addMarker: function(marker) {
this.markers.push(marker);
if (this.opacity < 1) {
marker.setOpacity(this.opacity);
}
if (this.map && this.map.getExtent()) {
marker.map = this.map;
this.drawMarker(marker);
}
},
/**
* APIMethod: removeMarker
*
* Parameters:
* marker - {<OpenLayers.Marker>}
*/
removeMarker: function(marker) {
if (this.markers && this.markers.length) {
OpenLayers.Util.removeItem(this.markers, marker);
marker.erase();
}
},
/**
* Method: clearMarkers
* This method removes all markers from a layer. The markers are not
* destroyed by this function, but are removed from the list of markers.
*/
clearMarkers: function() {
if (this.markers != null) {
while(this.markers.length > 0) {
this.removeMarker(this.markers[0]);
}
}
},
/**
* Method: drawMarker
* Calculate the pixel location for the marker, create it, and
* add it to the layer's div
*
* Parameters:
* marker - {<OpenLayers.Marker>}
*/
drawMarker: function(marker) {
var px = this.map.getLayerPxFromLonLat(marker.lonlat);
if (px == null) {
marker.display(false);
} else {
if (!marker.isDrawn()) {
var markerImg = marker.draw(px);
this.div.appendChild(markerImg);
} else if(marker.icon) {
marker.icon.moveTo(px);
}
}
},
/**
* APIMethod: getDataExtent
* Calculates the max extent which includes all of the markers.
*
* Returns:
* {<OpenLayers.Bounds>}
*/
getDataExtent: function () {
var maxExtent = null;
if ( this.markers && (this.markers.length > 0)) {
var maxExtent = new OpenLayers.Bounds();
for(var i=0, len=this.markers.length; i<len; i++) {
var marker = this.markers[i];
maxExtent.extend(marker.lonlat);
}
}
return maxExtent;
},
CLASS_NAME: "OpenLayers.Layer.Markers"
});
|
