<?php

/* vim: set expandtab sw=4 ts=4 sts=4: */

/**

 * Handles actions related to GIS LINESTRING objects

 *

 * @package PhpMyAdmin-GIS

 */



if (! defined('PHPMYADMIN')) {

    exit;

}



/**

 * Handles actions related to GIS LINESTRING objects

 *

 * @package PhpMyAdmin-GIS

 */

class PMA_GIS_Linestring extends PMA_GIS_Geometry

{

    // Hold the singleton instance of the class

    private static $_instance;



    /**

     * A private constructor; prevents direct creation of object.

     *

     * @access private

     */

    private function __construct()

    {

    }



    /**

     * Returns the singleton.

     *

     * @return PMA_GIS_Linestring the singleton

     * @access public

     */

    public static function singleton()

    {

        if (!isset(self::$_instance)) {

            $class = __CLASS__;

            self::$_instance = new $class;

        }



        return self::$_instance;

    }



    /**

     * Scales each row.

     *

     * @param string $spatial spatial data of a row

     *

     * @return array an array containing the min, max values for x and y cordinates

     * @access public

     */

    public function scaleRow($spatial)

    {

        // Trim to remove leading 'LINESTRING(' and trailing ')'

        $linesrting = substr($spatial, 11, (strlen($spatial) - 12));

        return $this->setMinMax($linesrting, array());

    }



    /**

     * Adds to the PNG image object, the data related to a row in the GIS dataset.

     *

     * @param string $spatial    GIS LINESTRING object

     * @param string $label      Label for the GIS LINESTRING object

     * @param string $line_color Color for the GIS LINESTRING object

     * @param array  $scale_data Array containing data related to scaling

     * @param object $image      Image object

     *

     * @return resource the modified image object

     * @access public

     */

    public function prepareRowAsPng($spatial, $label, $line_color,

        $scale_data, $image

    ) {

        // allocate colors

        $black = imagecolorallocate($image, 0, 0, 0);

        $red   = hexdec(substr($line_color, 1, 2));

        $green = hexdec(substr($line_color, 3, 2));

        $blue  = hexdec(substr($line_color, 4, 2));

        $color = imagecolorallocate($image, $red, $green, $blue);



        // Trim to remove leading 'LINESTRING(' and trailing ')'

        $linesrting = substr($spatial, 11, (strlen($spatial) - 12));

        $points_arr = $this->extractPoints($linesrting, $scale_data);



        foreach ($points_arr as $point) {

            if (! isset($temp_point)) {

                $temp_point = $point;

            } else {

                // draw line section

                imageline(

                    $image, $temp_point[0], $temp_point[1],

                    $point[0], $point[1], $color

                );

                $temp_point = $point;

            }

        }

        // print label if applicable

        if (isset($label) && trim($label) != '') {

            imagestring(

                $image, 1, $points_arr[1][0],

                $points_arr[1][1], trim($label), $black

            );

        }

        return $image;

    }



    /**

     * Adds to the TCPDF instance, the data related to a row in the GIS dataset.

     *

     * @param string $spatial    GIS LINESTRING object

     * @param string $label      Label for the GIS LINESTRING object

     * @param string $line_color Color for the GIS LINESTRING object

     * @param array  $scale_data Array containing data related to scaling

     * @param TCPDF  $pdf        TCPDF instance

     *

     * @return TCPDF the modified TCPDF instance

     * @access public

     */

    public function prepareRowAsPdf($spatial, $label, $line_color, $scale_data, $pdf)

    {

        // allocate colors

        $red   = hexdec(substr($line_color, 1, 2));

        $green = hexdec(substr($line_color, 3, 2));

        $blue  = hexdec(substr($line_color, 4, 2));

        $line  = array('width' => 1.5, 'color' => array($red, $green, $blue));



        // Trim to remove leading 'LINESTRING(' and trailing ')'

        $linesrting = substr($spatial, 11, (strlen($spatial) - 12));

        $points_arr = $this->extractPoints($linesrting, $scale_data);



        foreach ($points_arr as $point) {

            if (! isset($temp_point)) {

                $temp_point = $point;

            } else {

                // draw line section

                $pdf->Line(

                    $temp_point[0], $temp_point[1],

                    $point[0], $point[1], $line

                );

                $temp_point = $point;

            }

        }

        // print label

        if (isset($label) && trim($label) != '') {

            $pdf->SetXY($points_arr[1][0], $points_arr[1][1]);

            $pdf->SetFontSize(5);

            $pdf->Cell(0, 0, trim($label));

        }

        return $pdf;

    }



    /**

     * Prepares and returns the code related to a row in the GIS dataset as SVG.

     *

     * @param string $spatial    GIS LINESTRING object

     * @param string $label      Label for the GIS LINESTRING object

     * @param string $line_color Color for the GIS LINESTRING object

     * @param array  $scale_data Array containing data related to scaling

     *

     * @return string the code related to a row in the GIS dataset

     * @access public

     */

    public function prepareRowAsSvg($spatial, $label, $line_color, $scale_data)

    {

        $line_options = array(

            'name'        => $label,

            'id'          => $label . rand(),

            'class'       => 'linestring vector',

            'fill'        => 'none',

            'stroke'      => $line_color,

            'stroke-width'=> 2,

        );



        // Trim to remove leading 'LINESTRING(' and trailing ')'

        $linesrting = substr($spatial, 11, (strlen($spatial) - 12));

        $points_arr = $this->extractPoints($linesrting, $scale_data);



        $row = '<polyline points="';

        foreach ($points_arr as $point) {

            $row .= $point[0] . ',' . $point[1] . ' ';

        }

        $row .= '"';

        foreach ($line_options as $option => $val) {

            $row .= ' ' . $option . '="' . trim($val) . '"';

        }

        $row .= '/>';



        return $row;

    }



    /**

     * Prepares JavaScript related to a row in the GIS dataset

     * to visualize it with OpenLayers.

     *

     * @param string $spatial    GIS LINESTRING object

     * @param int    $srid       Spatial reference ID

     * @param string $label      Label for the GIS LINESTRING object

     * @param string $line_color Color for the GIS LINESTRING object

     * @param array  $scale_data Array containing data related to scaling

     *

     * @return string JavaScript related to a row in the GIS dataset

     * @access public

     */

    public function prepareRowAsOl($spatial, $srid, $label, $line_color, $scale_data)

    {

        $style_options = array(

            'strokeColor' => $line_color,

            'strokeWidth' => 2,

            'label'       => $label,

            'fontSize'    => 10,

        );

        if ($srid == 0) {

            $srid = 4326;

        }

        $result = $this->getBoundsForOl($srid, $scale_data);



        // Trim to remove leading 'LINESTRING(' and trailing ')'

        $linesrting = substr($spatial, 11, (strlen($spatial) - 12));

        $points_arr = $this->extractPoints($linesrting, null);



        $result .= 'vectorLayer.addFeatures(new OpenLayers.Feature.Vector('

            . $this->getLineForOpenLayers($points_arr, $srid)

            . ', null, ' . json_encode($style_options) . '));';

        return $result;

    }



    /**

     * Generate the WKT with the set of parameters passed by the GIS editor.

     *

     * @param array  $gis_data GIS data

     * @param int    $index    Index into the parameter object

     * @param string $empty    Value for empty points

     *

     * @return string WKT with the set of parameters passed by the GIS editor

     * @access public

     */

    public function generateWkt($gis_data, $index, $empty = '')

    {

        $no_of_points = isset($gis_data[$index]['LINESTRING']['no_of_points'])

            ? $gis_data[$index]['LINESTRING']['no_of_points'] : 2;

        if ($no_of_points < 2) {

            $no_of_points = 2;

        }

        $wkt = 'LINESTRING(';

        for ($i = 0; $i < $no_of_points; $i++) {

            $wkt .= ((isset($gis_data[$index]['LINESTRING'][$i]['x'])

                && trim($gis_data[$index]['LINESTRING'][$i]['x']) != '')

                ? $gis_data[$index]['LINESTRING'][$i]['x'] : $empty)

                . ' ' . ((isset($gis_data[$index]['LINESTRING'][$i]['y'])

                && trim($gis_data[$index]['LINESTRING'][$i]['y']) != '')

                ? $gis_data[$index]['LINESTRING'][$i]['y'] : $empty) . ',';

        }

        $wkt = substr($wkt, 0, strlen($wkt) - 1);

        $wkt .= ')';

        return $wkt;

    }



    /**

     * Generate parameters for the GIS data editor from the value of the GIS column.

     *

     * @param string $value of the GIS column

     * @param int    $index of the geometry

     *

     * @return array params for the GIS data editor from the value of the GIS column

     * @access public

     */

    public function generateParams($value, $index = -1)

    {

        if ($index == -1) {

            $index = 0;

            $params = array();

            $data = PMA_GIS_Geometry::generateParams($value);

            $params['srid'] = $data['srid'];

            $wkt = $data['wkt'];

        } else {

            $params[$index]['gis_type'] = 'LINESTRING';

            $wkt = $value;

        }



        // Trim to remove leading 'LINESTRING(' and trailing ')'

        $linestring = substr($wkt, 11, (strlen($wkt) - 12));

        $points_arr = $this->extractPoints($linestring, null);



        $no_of_points = count($points_arr);

        $params[$index]['LINESTRING']['no_of_points'] = $no_of_points;

        for ($i = 0; $i < $no_of_points; $i++) {

            $params[$index]['LINESTRING'][$i]['x'] = $points_arr[$i][0];

            $params[$index]['LINESTRING'][$i]['y'] = $points_arr[$i][1];

        }



        return $params;

    }

}

?>