Create Format.Text, and have Layer.Text use it. (Closes #1033)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5412 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
2007-12-14 22:02:00 +00:00
parent 7c04a7f88a
commit c9fdb6122f
3 changed files with 163 additions and 81 deletions
--- a/lib/OpenLayers/Format/Text.js
+++ b/lib/OpenLayers/Format/Text.js
@@ -0,0 +1,107 @@
+/* Copyright (c) 2006-2007 MetaCarta, Inc., published under a modified BSD license.
+ * See http://svn.openlayers.org/trunk/openlayers/repository-license.txt 
+ * 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, {
+    
+    /**
+     * 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) {
+        OpenLayers.Format.prototype.initialize.apply(this, [options]);
+    }, 
+
+    /**
+     * APIMethod: read
+     * Return a list of features from a Tab Seperated Values text string.
+     * 
+     * Parameters:
+     * data - {String} 
+     *
+     * Returns:
+     * An Array of <OpenLayers.Feature.Vector>s
+     */
+    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 = {};
+                    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['externalGraphic'] = vals[valIndex];
+                            else if (columns[valIndex] == 'iconSize') {
+                                var size = vals[valIndex].split(',');
+                                style['graphicWidth'] = parseFloat(size[0]);
+                                style['graphicHeight'] = parseFloat(size[1]);
+                            } else if (columns[valIndex] == 'iconOffset') {
+                                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];
+                            }    
+                        }
+                    }
+                    if (set) {
+                      var feature = new OpenLayers.Feature.Vector(geometry, attributes, style);
+                      features.push(feature);
+                    }
+                }
+            }
+        }
+        return features;
+    },   
+
+    CLASS_NAME: "OpenLayers.Format.Text" 
+});