1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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2 | * full list of contributors). Published under the Clear BSD license. |
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3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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4 | * full text of the license. */ |
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5 | |
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6 | /** |
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7 | * @requires OpenLayers/Feature/Vector.js |
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8 | * @requires OpenLayers/Geometry/Point.js |
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9 | */ |
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10 | |
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11 | /** |
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12 | * Class: OpenLayers.Format.Text |
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13 | * Read Text format. Create a new instance with the <OpenLayers.Format.Text> |
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14 | * constructor. This reads text which is formatted like CSV text, using |
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15 | * tabs as the seperator by default. It provides parsing of data originally |
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16 | * used in the MapViewerService, described on the wiki. This Format is used |
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17 | * by the <OpenLayers.Layer.Text> class. |
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18 | * |
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19 | * Inherits from: |
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20 | * - <OpenLayers.Format> |
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21 | */ |
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22 | OpenLayers.Format.Text = OpenLayers.Class(OpenLayers.Format, { |
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23 | |
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24 | /** |
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25 | * APIProperty: defaultStyle |
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26 | * defaultStyle allows one to control the default styling of the features. |
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27 | * It should be a symbolizer hash. By default, this is set to match the |
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28 | * Layer.Text behavior, which is to use the default OpenLayers Icon. |
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29 | */ |
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30 | defaultStyle: null, |
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31 | |
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32 | /** |
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33 | * APIProperty: extractStyles |
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34 | * set to true to extract styles from the TSV files, using information |
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35 | * from the image or icon, iconSize and iconOffset fields. This will result |
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36 | * in features with a symbolizer (style) property set, using the |
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37 | * default symbolizer specified in <defaultStyle>. Set to false if you |
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38 | * wish to use a styleMap or OpenLayers.Style options to style your |
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39 | * layer instead. |
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40 | */ |
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41 | extractStyles: true, |
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42 | |
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43 | /** |
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44 | * Constructor: OpenLayers.Format.Text |
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45 | * Create a new parser for TSV Text. |
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46 | * |
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47 | * Parameters: |
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48 | * options - {Object} An optional object whose properties will be set on |
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49 | * this instance. |
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50 | */ |
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51 | initialize: function(options) { |
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52 | options = options || {}; |
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53 | |
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54 | if(options.extractStyles !== false) { |
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55 | options.defaultStyle = { |
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56 | 'externalGraphic': OpenLayers.Util.getImagesLocation() + |
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57 | "marker.png", |
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58 | 'graphicWidth': 21, |
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59 | 'graphicHeight': 25, |
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60 | 'graphicXOffset': -10.5, |
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61 | 'graphicYOffset': -12.5 |
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62 | }; |
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63 | } |
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64 | |
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65 | OpenLayers.Format.prototype.initialize.apply(this, [options]); |
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66 | }, |
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67 | |
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68 | /** |
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69 | * APIMethod: read |
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70 | * Return a list of features from a Tab Seperated Values text string. |
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71 | * |
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72 | * Parameters: |
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73 | * data - {String} |
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74 | * |
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75 | * Returns: |
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76 | * An Array of <OpenLayers.Feature.Vector>s |
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77 | */ |
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78 | read: function(text) { |
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79 | var lines = text.split('\n'); |
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80 | var columns; |
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81 | var features = []; |
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82 | // length - 1 to allow for trailing new line |
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83 | for (var lcv = 0; lcv < (lines.length - 1); lcv++) { |
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84 | var currLine = lines[lcv].replace(/^\s*/,'').replace(/\s*$/,''); |
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85 | |
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86 | if (currLine.charAt(0) != '#') { /* not a comment */ |
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87 | |
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88 | if (!columns) { |
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89 | //First line is columns |
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90 | columns = currLine.split('\t'); |
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91 | } else { |
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92 | var vals = currLine.split('\t'); |
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93 | var geometry = new OpenLayers.Geometry.Point(0,0); |
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94 | var attributes = {}; |
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95 | var style = this.defaultStyle ? |
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96 | OpenLayers.Util.applyDefaults({}, this.defaultStyle) : |
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97 | null; |
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98 | var icon, iconSize, iconOffset, overflow; |
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99 | var set = false; |
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100 | for (var valIndex = 0; valIndex < vals.length; valIndex++) { |
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101 | if (vals[valIndex]) { |
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102 | if (columns[valIndex] == 'point') { |
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103 | var coords = vals[valIndex].split(','); |
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104 | geometry.y = parseFloat(coords[0]); |
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105 | geometry.x = parseFloat(coords[1]); |
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106 | set = true; |
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107 | } else if (columns[valIndex] == 'lat') { |
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108 | geometry.y = parseFloat(vals[valIndex]); |
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109 | set = true; |
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110 | } else if (columns[valIndex] == 'lon') { |
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111 | geometry.x = parseFloat(vals[valIndex]); |
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112 | set = true; |
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113 | } else if (columns[valIndex] == 'title') |
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114 | attributes['title'] = vals[valIndex]; |
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115 | else if (columns[valIndex] == 'image' || |
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116 | columns[valIndex] == 'icon' && style) { |
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117 | style['externalGraphic'] = vals[valIndex]; |
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118 | } else if (columns[valIndex] == 'iconSize' && style) { |
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119 | var size = vals[valIndex].split(','); |
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120 | style['graphicWidth'] = parseFloat(size[0]); |
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121 | style['graphicHeight'] = parseFloat(size[1]); |
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122 | } else if (columns[valIndex] == 'iconOffset' && style) { |
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123 | var offset = vals[valIndex].split(','); |
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124 | style['graphicXOffset'] = parseFloat(offset[0]); |
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125 | style['graphicYOffset'] = parseFloat(offset[1]); |
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126 | } else if (columns[valIndex] == 'description') { |
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127 | attributes['description'] = vals[valIndex]; |
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128 | } else if (columns[valIndex] == 'overflow') { |
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129 | attributes['overflow'] = vals[valIndex]; |
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130 | } else { |
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131 | // For StyleMap filtering, allow additional |
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132 | // columns to be stored as attributes. |
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133 | attributes[columns[valIndex]] = vals[valIndex]; |
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134 | } |
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135 | } |
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136 | } |
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137 | if (set) { |
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138 | if (this.internalProjection && this.externalProjection) { |
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139 | geometry.transform(this.externalProjection, |
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140 | this.internalProjection); |
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141 | } |
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142 | var feature = new OpenLayers.Feature.Vector(geometry, attributes, style); |
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143 | features.push(feature); |
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144 | } |
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145 | } |
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146 | } |
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147 | } |
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148 | return features; |
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149 | }, |
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150 | |
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151 | CLASS_NAME: "OpenLayers.Format.Text" |
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152 | }); |
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