libraries/gis/pma_gis_linestring.php

   1 <?php
   2 /**
   3  * Handles the visualization of GIS LINESTRING objects.
   4  *
   5  * @package phpMyAdmin-GIS
   6  */
   7 class PMA_GIS_Linestring extends PMA_GIS_Geometry
   8 {
   9     // Hold the singleton instance of the class
  10     private static $_instance;
  11
  12     /**
  13      * A private constructor; prevents direct creation of object.
  14      */
  15     private function __construct()
  16     {
  17     }
  18
  19     /**
  20      * Returns the singleton.
  21      *
  22      * @return the singleton
  23      */
  24     public static function singleton()
  25     {
  26         if (!isset(self::$_instance)) {
  27             $class = __CLASS__;
  28             self::$_instance = new $class;
  29         }
  30
  31         return self::$_instance;
  32     }
  33
  34     /**
  35      * Scales each row.
  36      *
  37      * @param string $spatial spatial data of a row
  38      *
  39      * @return array containing the min, max values for x and y cordinates
  40      */
  41     public function scaleRow($spatial)
  42     {
  43         // Trim to remove leading 'LINESTRING(' and trailing ')'
  44         $linesrting = substr($spatial, 11, (strlen($spatial) - 12));
  45         return $this->setMinMax($linesrting, array());
  46     }
  47
  48     /**
  49      * Adds to the PNG image object, the data related to a row in the GIS dataset.
  50      *
  51      * @param string $spatial    GIS LINESTRING object
  52      * @param string $label      Label for the GIS LINESTRING object
  53      * @param string $line_color Color for the GIS LINESTRING object
  54      * @param array  $scale_data Array containing data related to scaling
  55      * @param image  $image      Image object
  56      *
  57      * @return the modified image object
  58      */
  59     public function prepareRowAsPng($spatial, $label, $line_color, $scale_data, $image)
  60     {
  61         // allocate colors
  62         $black = imagecolorallocate($image, 0, 0, 0);
  63         $red   = hexdec(substr($line_color, 1, 2));
  64         $green = hexdec(substr($line_color, 3, 2));
  65         $blue  = hexdec(substr($line_color, 4, 2));
  66         $color = imagecolorallocate($image, $red, $green, $blue);
  67
  68         // Trim to remove leading 'LINESTRING(' and trailing ')'
  69         $linesrting = substr($spatial, 11, (strlen($spatial) - 12));
  70         $points_arr = $this->extractPoints($linesrting, $scale_data);
  71
  72         foreach ($points_arr as $point) {
  73             if (! isset($temp_point)) {
  74                 $temp_point = $point;
  75             } else {
  76                 // draw line section
  77                 imageline($image, $temp_point[0], $temp_point[1], $point[0], $point[1], $color);
  78                 $temp_point = $point;
  79             }
  80         }
  81         // print label if applicable
  82         if (isset($label) && trim($label) != '') {
  83             imagestring($image, 1, $points_arr[1][0], $points_arr[1][1], trim($label), $black);
  84         }
  85         return $image;
  86     }
  87
  88     /**
  89      * Adds to the TCPDF instance, the data related to a row in the GIS dataset.
  90      *
  91      * @param string $spatial    GIS LINESTRING object
  92      * @param string $label      Label for the GIS LINESTRING object
  93      * @param string $line_color Color for the GIS LINESTRING object
  94      * @param array  $scale_data Array containing data related to scaling
  95      * @param image  $pdf        TCPDF instance
  96      *
  97      * @return the modified TCPDF instance
  98      */
  99     public function prepareRowAsPdf($spatial, $label, $line_color, $scale_data, $pdf)
 100     {
 101         // allocate colors
 102         $red   = hexdec(substr($line_color, 1, 2));
 103         $green = hexdec(substr($line_color, 3, 2));
 104         $blue  = hexdec(substr($line_color, 4, 2));
 105         $line  = array('width' => 1.5, 'color' => array($red, $green, $blue));
 106
 107         // Trim to remove leading 'LINESTRING(' and trailing ')'
 108         $linesrting = substr($spatial, 11, (strlen($spatial) - 12));
 109         $points_arr = $this->extractPoints($linesrting, $scale_data);
 110
 111         foreach ($points_arr as $point) {
 112             if (! isset($temp_point)) {
 113                 $temp_point = $point;
 114             } else {
 115                 // draw line section
 116                 $pdf->Line($temp_point[0], $temp_point[1], $point[0], $point[1], $line);
 117                 $temp_point = $point;
 118             }
 119         }
 120         // print label
 121         if (isset($label) && trim($label) != '') {
 122             $pdf->SetXY($points_arr[1][0], $points_arr[1][1]);
 123             $pdf->SetFontSize(5);
 124             $pdf->Cell(0, 0, trim($label));
 125         }
 126         return $pdf;
 127     }
 128
 129     /**
 130      * Prepares and returns the code related to a row in the GIS dataset as SVG.
 131      *
 132      * @param string $spatial    GIS LINESTRING object
 133      * @param string $label      Label for the GIS LINESTRING object
 134      * @param string $line_color Color for the GIS LINESTRING object
 135      * @param array  $scale_data Array containing data related to scaling
 136      *
 137      * @return the code related to a row in the GIS dataset
 138      */
 139     public function prepareRowAsSvg($spatial, $label, $line_color, $scale_data)
 140     {
 141         $line_options = array(
 142             'name'        => $label,
 143             'id'          => $label . rand(),
 144             'class'       => 'linestring vector',
 145             'fill'        => 'none',
 146             'stroke'      => $line_color,
 147             'stroke-width'=> 2,
 148         );
 149
 150         // Trim to remove leading 'LINESTRING(' and trailing ')'
 151         $linesrting = substr($spatial, 11, (strlen($spatial) - 12));
 152         $points_arr = $this->extractPoints($linesrting, $scale_data);
 153
 154         $row = '<polyline points="';
 155         foreach ($points_arr as $point) {
 156             $row .= $point[0] . ',' . $point[1] . ' ';
 157         }
 158         $row .= '"';
 159         foreach ($line_options as $option => $val) {
 160             $row .= ' ' . $option . '="' . trim($val) . '"';
 161         }
 162         $row .= '/>';
 163
 164         return $row;
 165     }
 166
 167     /**
 168      * Prepares JavaScript related to a row in the GIS dataset
 169      * to visualize it with OpenLayers.
 170      *
 171      * @param string $spatial    GIS LINESTRING object
 172      * @param int    $srid       Spatial reference ID
 173      * @param string $label      Label for the GIS LINESTRING object
 174      * @param string $line_color Color for the GIS LINESTRING object
 175      * @param array  $scale_data Array containing data related to scaling
 176      *
 177      * @return JavaScript related to a row in the GIS dataset
 178      */
 179     public function prepareRowAsOl($spatial, $srid, $label, $line_color, $scale_data)
 180     {
 181         $style_options = array(
 182             'strokeColor' => $line_color,
 183             'strokeWidth' => 2,
 184             'label'       => $label,
 185             'fontSize'    => 10,
 186         );
 187         if ($srid == 0) {
 188             $srid = 4326;
 189         }
 190         $result = $this->getBoundsForOl($srid, $scale_data);
 191
 192         // Trim to remove leading 'LINESTRING(' and trailing ')'
 193         $linesrting = substr($spatial, 11, (strlen($spatial) - 12));
 194         $points_arr = $this->extractPoints($linesrting, null);
 195
 196         $row = 'new Array(';
 197         foreach ($points_arr as $point) {
 198             $row .= '(new OpenLayers.Geometry.Point(' . $point[0] . ', '
 199                 . $point[1] . ')).transform(new OpenLayers.Projection("EPSG:'
 200                 . $srid . '"), map.getProjectionObject()), ';
 201         }
 202         $row = substr($row, 0, strlen($row) - 2);
 203         $row .= ')';
 204
 205         $result .= 'vectorLayer.addFeatures(new OpenLayers.Feature.Vector('
 206             . 'new OpenLayers.Geometry.LineString(' . $row . '), null, '
 207             . json_encode($style_options) . '));';
 208         return $result;
 209     }
 210
 211     /**
 212      * Generate the WKT with the set of parameters passed by the GIS editor.
 213      *
 214      * @param array  $gis_data GIS data
 215      * @param int    $index    Index into the parameter object
 216      * @param string $empty    Value for empty points
 217      *
 218      * @return WKT with the set of parameters passed by the GIS editor
 219      */
 220     public function generateWkt($gis_data, $index, $empty = '')
 221     {
 222         $no_of_points = isset($gis_data[$index]['LINESTRING']['no_of_points'])
 223             ? $gis_data[$index]['LINESTRING']['no_of_points'] : 2;
 224         if ($no_of_points < 2) {
 225             $no_of_points = 2;
 226         }
 227         $wkt = 'LINESTRING(';
 228         for ($i = 0; $i < $no_of_points; $i++) {
 229             $wkt .= ((isset($gis_data[$index]['LINESTRING'][$i]['x'])
 230                 && trim($gis_data[$index]['LINESTRING'][$i]['x']) != '')
 231                 ? $gis_data[$index]['LINESTRING'][$i]['x'] : $empty)
 232                 . ' ' . ((isset($gis_data[$index]['LINESTRING'][$i]['y'])
 233                 && trim($gis_data[$index]['LINESTRING'][$i]['y']) != '')
 234                 ? $gis_data[$index]['LINESTRING'][$i]['y'] : $empty) .',';
 235         }
 236         $wkt = substr($wkt, 0, strlen($wkt) - 1);
 237         $wkt .= ')';
 238         return $wkt;
 239     }
 240
 241     /**
 242      * Generate parameters for the GIS data editor from the value of the GIS column.
 243      *
 244      * @param string $value of the GIS column
 245      * @param index  $index of the geometry
 246      *
 247      * @return  parameters for the GIS data editor from the value of the GIS column
 248      */
 249     public function generateParams($value, $index = -1)
 250     {
 251         if ($index == -1) {
 252             $index = 0;
 253             $params = array();
 254             $data = PMA_GIS_Geometry::generateParams($value);
 255             $params['srid'] = $data['srid'];
 256             $wkt = $data['wkt'];
 257         } else {
 258             $params[$index]['gis_type'] = 'LINESTRING';
 259             $wkt = $value;
 260         }
 261
 262         // Trim to remove leading 'LINESTRING(' and trailing ')'
 263         $linestring = substr($wkt, 11, (strlen($wkt) - 12));
 264         $points_arr = $this->extractPoints($linestring, null);
 265
 266         $no_of_points = count($points_arr);
 267         $params[$index]['LINESTRING']['no_of_points'] = $no_of_points;
 268         for ($i = 0; $i < $no_of_points; $i++) {
 269             $params[$index]['LINESTRING'][$i]['x'] = $points_arr[$i][0];
 270             $params[$index]['LINESTRING'][$i]['y'] = $points_arr[$i][1];
 271         }
 272
 273         return $params;
 274     }
 275 }
 276 ?>