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<?php
/**
* Handles actions related to GIS LINESTRING objects
*/
declare(strict_types=1);
namespace PhpMyAdmin\Gis;
use TCPDF;
use function count;
use function hexdec;
use function imagecolorallocate;
use function imageline;
use function imagestring;
use function json_encode;
use function mb_strlen;
use function mb_substr;
use function trim;
/**
* Handles actions related to GIS LINESTRING objects
*/
class GisLineString extends GisGeometry
{
/** @var self */
private static $instance;
/**
* A private constructor; prevents direct creation of object.
*
* @access private
*/
private function __construct()
{
}
/**
* Returns the singleton.
*
* @return GisLineString the singleton
*
* @access public
*/
public static function singleton()
{
if (! isset(self::$instance)) {
self::$instance = new GisLineString();
}
return self::$instance;
}
/**
* Scales each row.
*
* @param string $spatial spatial data of a row
*
* @return array an array containing the min, max values for x and y coordinates
*
* @access public
*/
public function scaleRow($spatial)
{
// Trim to remove leading 'LINESTRING(' and trailing ')'
$linestring
= mb_substr(
$spatial,
11,
mb_strlen($spatial) - 12
);
return $this->setMinMax($linestring, []);
}
/**
* Adds to the PNG image object, the data related to a row in the GIS dataset.
*
* @param string $spatial GIS POLYGON object
* @param string|null $label Label for the GIS POLYGON object
* @param string $line_color Color for the GIS POLYGON object
* @param array $scale_data Array containing data related to scaling
* @param resource $image Image object
*
* @return resource the modified image object
*
* @access public
*/
public function prepareRowAsPng(
$spatial,
?string $label,
$line_color,
array $scale_data,
$image
) {
// allocate colors
$black = imagecolorallocate($image, 0, 0, 0);
$red = hexdec(mb_substr($line_color, 1, 2));
$green = hexdec(mb_substr($line_color, 3, 2));
$blue = hexdec(mb_substr($line_color, 4, 2));
$color = imagecolorallocate($image, $red, $green, $blue);
// Trim to remove leading 'LINESTRING(' and trailing ')'
$linesrting
= mb_substr(
$spatial,
11,
mb_strlen($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,
(int) $temp_point[0],
(int) $temp_point[1],
(int) $point[0],
(int) $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|null $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, ?string $label, $line_color, array $scale_data, $pdf)
{
// allocate colors
$red = hexdec(mb_substr($line_color, 1, 2));
$green = hexdec(mb_substr($line_color, 3, 2));
$blue = hexdec(mb_substr($line_color, 4, 2));
$line = [
'width' => 1.5,
'color' => [
$red,
$green,
$blue,
],
];
// Trim to remove leading 'LINESTRING(' and trailing ')'
$linesrting
= mb_substr(
$spatial,
11,
mb_strlen($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, array $scale_data)
{
$line_options = [
'name' => $label,
'id' => $label . $this->getRandomId(),
'class' => 'linestring vector',
'fill' => 'none',
'stroke' => $line_color,
'stroke-width' => 2,
];
// Trim to remove leading 'LINESTRING(' and trailing ')'
$linesrting
= mb_substr(
$spatial,
11,
mb_strlen($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((string) $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 array $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, array $scale_data)
{
$stroke_style = [
'color' => $line_color,
'width' => 2,
];
$result = 'var style = new ol.style.Style({'
. 'stroke: new ol.style.Stroke(' . json_encode($stroke_style) . ')';
if ($label) {
$text_style = ['text' => $label];
$result .= ', text: new ol.style.Text(' . json_encode($text_style) . ')';
}
$result .= '});';
if ($srid == 0) {
$srid = 4326;
}
$result .= $this->getBoundsForOl($srid, $scale_data);
// Trim to remove leading 'LINESTRING(' and trailing ')'
$linesrting
= mb_substr(
$spatial,
11,
mb_strlen($spatial) - 12
);
$points_arr = $this->extractPoints($linesrting, null);
return $result . 'var line = new ol.Feature({geometry: '
. $this->getLineForOpenLayers($points_arr, $srid) . '});'
. 'line.setStyle(style);'
. 'vectorLayer.addFeature(line);';
}
/**
* 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(array $gis_data, $index, $empty = '')
{
$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((string) $gis_data[$index]['LINESTRING'][$i]['x']) != ''
? $gis_data[$index]['LINESTRING'][$i]['x'] : $empty)
. ' ' . (isset($gis_data[$index]['LINESTRING'][$i]['y'])
&& trim((string) $gis_data[$index]['LINESTRING'][$i]['y']) != ''
? $gis_data[$index]['LINESTRING'][$i]['y'] : $empty) . ',';
}
$wkt
= mb_substr(
$wkt,
0,
mb_strlen($wkt) - 1
);
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)
{
$params = [];
if ($index == -1) {
$index = 0;
$data = GisGeometry::generateParams($value);
$params['srid'] = $data['srid'];
$wkt = $data['wkt'];
} else {
$params[$index]['gis_type'] = 'LINESTRING';
$wkt = $value;
}
// Trim to remove leading 'LINESTRING(' and trailing ')'
$linestring
= mb_substr(
$wkt,
11,
mb_strlen($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;
}
}