mirror of
https://github.com/friendica/friendica
synced 2024-11-15 05:33:53 +00:00
88 lines
3 KiB
JavaScript
88 lines
3 KiB
JavaScript
|
/* Copyright (c) 2011 by MapQuery Contributors (see AUTHORS for
|
||
|
|
* full list of contributors). Published under the MIT license.
|
||
|
|
* See https://github.com/mapquery/mapquery/blob/master/LICENSE for the
|
||
|
|
* full text of the license. */
|
||
|
|
|
||
|
|
/**
|
||
|
|
#jquery.mapquery.legend.js
|
||
|
|
A plugin on mapquery.core to add a legend to a layer. It will check if the layer
|
||
|
|
is within a valid extent and zoom range. And if not will return an error message.
|
||
|
|
*/
|
||
|
|
|
||
|
|
(function($, MQ) {
|
||
|
|
$.extend( $.fn.mapQuery.defaults.layer.all, {
|
||
|
|
legend: {
|
||
|
|
url: '',
|
||
|
|
msg: ''
|
||
|
|
}
|
||
|
|
});
|
||
|
|
//possible error messages to display in the legend
|
||
|
|
LEGEND_ERRORS= ['E_ZOOMOUT', 'E_ZOOMIN', 'E_OUTSIDEBOX'];
|
||
|
|
$.extend(MQ.Layer.prototype, {
|
||
|
|
/**
|
||
|
|
###**layer**.`legend([options])`
|
||
|
|
_version added 0.1_
|
||
|
|
####**Description**: get/set the legend of a layer
|
||
|
|
|
||
|
|
**options** url:url the url to the legend image
|
||
|
|
|
||
|
|
>Returns: {url:url, msg:'E\_ZOOMOUT' | 'E\_ZOOMIN' | 'E\_OUTSIDEBOX' | ''}
|
||
|
|
|
||
|
|
|
||
|
|
The `.legend()` function allows us to attach a legend image to a layer. It will
|
||
|
|
also check if the layer is not visible due to wrong extent or zoom level.
|
||
|
|
It will return an error message which can be used to notify the user.
|
||
|
|
|
||
|
|
|
||
|
|
var legend = layer.legend(); //get the current legend
|
||
|
|
//set the legend url to legendimage.png
|
||
|
|
layer.legend({url:'legendimage.png'})
|
||
|
|
|
||
|
|
*/
|
||
|
|
//get/set the legend object
|
||
|
|
legend: function(options) {
|
||
|
|
//get the legend object
|
||
|
|
var center = this.map.center();
|
||
|
|
if (arguments.length===0) {
|
||
|
|
this._checkZoom(center);
|
||
|
|
//if zoom = ok, check box
|
||
|
|
if(this.options.legend.msg==''){
|
||
|
|
this._checkBox(center);
|
||
|
|
}
|
||
|
|
return this.options.legend;
|
||
|
|
}
|
||
|
|
//set the legend url
|
||
|
|
if (options.url!==undefined) {
|
||
|
|
this.options.legend.url = options.url;
|
||
|
|
return this.options.legend;
|
||
|
|
}
|
||
|
|
},
|
||
|
|
//Check if the layer has a maximum box set and if the current box
|
||
|
|
//is outside these settings, set the legend.msg accordingly
|
||
|
|
_checkBox: function(center){
|
||
|
|
var maxExtent = this.options.maxExtent;
|
||
|
|
if(maxExtent!==undefined) {
|
||
|
|
var mapBounds = new OpenLayers.Bounds(
|
||
|
|
center.box[0],center.box[1],center.box[2],center.box[3]);
|
||
|
|
var layerBounds = new OpenLayers.Bounds(
|
||
|
|
maxExtent[0],maxExtent[1],maxExtent[2],maxExtent[3]);
|
||
|
|
var inside = layerBounds.containsBounds(mapBounds, true);
|
||
|
|
this.options.legend.msg = inside?'':LEGEND_ERRORS[2];
|
||
|
|
}
|
||
|
|
},
|
||
|
|
//Check if the layer has a minimum or maximum zoom set and if the
|
||
|
|
//current zoom is outside these settings, set the legend.msg accordingly
|
||
|
|
_checkZoom: function(center){
|
||
|
|
var zoom = center.zoom;
|
||
|
|
var maxZoom = this.options.maxZoom;
|
||
|
|
var minZoom = this.options.minZoom;
|
||
|
|
this.options.legend.msg=(
|
||
|
|
maxZoom!==undefined&&maxZoom<zoom)? LEGEND_ERRORS[0]:'';
|
||
|
|
this.options.legend.msg=(
|
||
|
|
minZoom!==undefined&&minZoom>zoom)? LEGEND_ERRORS[1]:'';
|
||
|
|
}
|
||
|
|
|
||
|
|
});
|
||
|
|
|
||
|
|
})(jQuery, $.MapQuery);
|