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/* 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/Feature/Vector.js
* @requires OpenLayers/Geometry/Point.js
*/
/**
* Class: OpenLayers.Format.Text
* Read Text format. Create a new instance with the <OpenLayers.Format.Text>
* constructor. This reads text which is formatted like CSV text, using
* tabs as the seperator by default. It provides parsing of data originally
* used in the MapViewerService, described on the wiki. This Format is used
* by the <OpenLayers.Layer.Text> class.
*
* Inherits from:
* - <OpenLayers.Format>
*/
OpenLayers.Format.Text = OpenLayers.Class(OpenLayers.Format, {
/**
* APIProperty: defaultStyle
* defaultStyle allows one to control the default styling of the features.
* It should be a symbolizer hash. By default, this is set to match the
* Layer.Text behavior, which is to use the default OpenLayers Icon.
*/
defaultStyle: null,
/**
* APIProperty: extractStyles
* set to true to extract styles from the TSV files, using information
* from the image or icon, iconSize and iconOffset fields. This will result
* in features with a symbolizer (style) property set, using the
* default symbolizer specified in <defaultStyle>. Set to false if you
* wish to use a styleMap or OpenLayers.Style options to style your
* layer instead.
*/
extractStyles: true,
/**
* Constructor: OpenLayers.Format.Text
* Create a new parser for TSV Text.
*
* Parameters:
* options - {Object} An optional object whose properties will be set on
* this instance.
*/
initialize: function(options) {
options = options || {};
if(options.extractStyles !== false) {
options.defaultStyle = {
'externalGraphic': OpenLayers.Util.getImageLocation("marker.png"),
'graphicWidth': 21,
'graphicHeight': 25,
'graphicXOffset': -10.5,
'graphicYOffset': -12.5
};
}
OpenLayers.Format.prototype.initialize.apply(this, [options]);
},
/**
* APIMethod: read
* Return a list of features from a Tab Seperated Values text string.
*
* Parameters:
* text - {String}
*
* Returns:
* Array({<OpenLayers.Feature.Vector>})
*/
read: function(text) {
var lines = text.split('\n');
var columns;
var features = [];
// length - 1 to allow for trailing new line
for (var lcv = 0; lcv < (lines.length - 1); lcv++) {
var currLine = lines[lcv].replace(/^\s*/,'').replace(/\s*$/,'');
if (currLine.charAt(0) != '#') { /* not a comment */
if (!columns) {
//First line is columns
columns = currLine.split('\t');
} else {
var vals = currLine.split('\t');
var geometry = new OpenLayers.Geometry.Point(0,0);
var attributes = {};
var style = this.defaultStyle ?
OpenLayers.Util.applyDefaults({}, this.defaultStyle) :
null;
var icon, iconSize, iconOffset, overflow;
var set = false;
for (var valIndex = 0; valIndex < vals.length; valIndex++) {
if (vals[valIndex]) {
if (columns[valIndex] == 'point') {
var coords = vals[valIndex].split(',');
geometry.y = parseFloat(coords[0]);
geometry.x = parseFloat(coords[1]);
set = true;
} else if (columns[valIndex] == 'lat') {
geometry.y = parseFloat(vals[valIndex]);
set = true;
} else if (columns[valIndex] == 'lon') {
geometry.x = parseFloat(vals[valIndex]);
set = true;
} else if (columns[valIndex] == 'title')
attributes['title'] = vals[valIndex];
else if (columns[valIndex] == 'image' ||
columns[valIndex] == 'icon' && style) {
style['externalGraphic'] = vals[valIndex];
} else if (columns[valIndex] == 'iconSize' && style) {
var size = vals[valIndex].split(',');
style['graphicWidth'] = parseFloat(size[0]);
style['graphicHeight'] = parseFloat(size[1]);
} else if (columns[valIndex] == 'iconOffset' && style) {
var offset = vals[valIndex].split(',');
style['graphicXOffset'] = parseFloat(offset[0]);
style['graphicYOffset'] = parseFloat(offset[1]);
} else if (columns[valIndex] == 'description') {
attributes['description'] = vals[valIndex];
} else if (columns[valIndex] == 'overflow') {
attributes['overflow'] = vals[valIndex];
} else {
// For StyleMap filtering, allow additional
// columns to be stored as attributes.
attributes[columns[valIndex]] = vals[valIndex];
}
}
}
if (set) {
if (this.internalProjection && this.externalProjection) {
geometry.transform(this.externalProjection,
this.internalProjection);
}
var feature = new OpenLayers.Feature.Vector(geometry, attributes, style);
features.push(feature);
}
}
}
}
return features;
},
CLASS_NAME: "OpenLayers.Format.Text"
});