mirror of
https://github.com/Viglino/ol-ext.git
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104 lines
4.6 KiB
JavaScript
104 lines
4.6 KiB
JavaScript
/* Copyright (c) 2015 Jean-Marc VIGLINO,
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released under the CeCILL-B license (French BSD license)
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(http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt).
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*/
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/**
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* Return a preview image of the source.
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* @param {ol.Coordinate|undefined} lonlat The center of the preview.
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* @param {number} resolution of the preview.
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* @return {String} the preview url
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* @api
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*/
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ol.source.Source.prototype.getPreview = function(lonlat, resolution)
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{ return "data:image/png;base64,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";
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}
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/**
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* Return the tile image of the source.
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* @param {ol.Coordinate|undefined} lonlat The center of the preview.
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* @param {number} resolution of the preview.
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* @return {String} the preview url
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* @api
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*/
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ol.source.Tile.prototype.getPreview = function(lonlat, resolution)
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{ if (!lonlat) lonlat = [21020, 6355964];
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if (!resolution) resolution = 150;
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var coord = this.getTileGrid().getTileCoordForCoordAndResolution(lonlat, resolution);
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var fn = this.getTileUrlFunction();
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return fn.call(this, coord, this.getProjection());
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}
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/**
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* Return the tile image of the source.
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* @param {ol.Coordinate|undefined} lonlat The center of the preview.
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* @param {number} resolution of the preview.
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* @return {String} the preview url
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* @api
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*/
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ol.source.TileWMS.prototype.getPreview = function(lonlat, resolution)
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{ if (!lonlat) lonlat = [21020, 6355964];
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if (!resolution) resolution = 150;
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/* No way to acces tileUrlFunction...
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var fn = this.getTileUrlFunction();
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return fn.call(this, lonlat, this.getProjection());
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*/
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// Use getfeature info instead
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var url = this.getGetFeatureInfoUrl(lonlat, resolution, this.getProjection() || 'EPSG:3857', {});
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url = url.replace(/getfeatureinfo/i,"GetMap");
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return url;
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}
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/**
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* Return a preview for the layer.
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* @param {ol.Coordinate|undefined} lonlat The center of the preview.
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* @param {number} resolution of the preview.
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* @return {Array<String>} list of preview url
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* @api
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*/
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ol.layer.Layer.prototype.getPreview = function(lonlat, resolution)
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{ if (this.get("preview")) return [ this.get("preview") ];
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if (!resolution) resolution = 150;
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// Get middle resolution
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if (resolution < this.getMinResolution() || resolution > this.getMaxResolution())
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{ var rmin = this.getMinResolution(),
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rmax = this.getMaxResolution();
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if (rmax>100000) rmax = 156543; // min zoom : world
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if (rmin<0.15) rmin = 0.15; // max zoom
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resolution = rmax;
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while (rmax>rmin)
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{ rmin *= 2;
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rmax /= 2;
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resolution = rmin;
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}
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}
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var e = this.getExtent();
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if (!lonlat) lonlat = [21020, 6355964]; // Default lonlat
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if (e && !ol.extent.containsCoordinate(e,lonlat)) lonlat = [ (e[0]+e[2])/2, (e[1]+e[3])/2 ];
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if (this.getSource) return [ this.getSource().getPreview(lonlat, resolution) ];
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return [];
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}
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/**
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* Return a preview for the layer.
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* @param {ol.Coordinate|undefined} lonlat The center of the preview.
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* @param {number} resolution of the preview.
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* @return {Array<String>} list of preview url
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* @api
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*/
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ol.layer.Group.prototype.getPreview = function(lonlat, resolution)
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{ if (this.get("preview")) return [ this.get("preview") ];
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var t = [];
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if (this.getLayers)
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{ var l = this.getLayers().getArray();
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for (var i=0; i<l.length; i++)
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{ t = t.concat(l[i].getPreview(lonlat, resolution));
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}
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}
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return t;
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}
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