Viewing file:  GisMultiPolygon.php (20.39 KB) -rw-r--r--
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<?php
/**
* Handles actions related to GIS MULTIPOLYGON objects
*/
declare(strict_types=1);
namespace PhpMyAdmin\Gis;
use TCPDF;
use function array_merge;
use function array_push;
use function array_slice;
use function count;
use function explode;
use function hexdec;
use function imagecolorallocate;
use function imagefilledpolygon;
use function imagestring;
use function json_encode;
use function mb_strlen;
use function mb_strpos;
use function mb_substr;
use function trim;
/**
* Handles actions related to GIS MULTIPOLYGON objects
*/
class GisMultiPolygon extends GisGeometry
{
/** @var self */
private static $instance;
/**
* A private constructor; prevents direct creation of object.
*
* @access private
*/
private function __construct()
{
}
/**
* Returns the singleton.
*
* @return GisMultiPolygon the singleton
*
* @access public
*/
public static function singleton()
{
if (! isset(self::$instance)) {
self::$instance = new GisMultiPolygon();
}
return self::$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)
{
$min_max = [];
// Trim to remove leading 'MULTIPOLYGON(((' and trailing ')))'
$multipolygon
= mb_substr(
$spatial,
15,
mb_strlen($spatial) - 18
);
// Separate each polygon
$polygons = explode(')),((', $multipolygon);
foreach ($polygons as $polygon) {
// If the polygon doesn't have an inner ring, use polygon itself
if (mb_strpos($polygon, '),(') === false) {
$ring = $polygon;
} else {
// Separate outer ring and use it to determine min-max
$parts = explode('),(', $polygon);
$ring = $parts[0];
}
$min_max = $this->setMinMax($ring, $min_max);
}
return $min_max;
}
/**
* 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 $fill_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,
$fill_color,
array $scale_data,
$image
) {
// allocate colors
$black = imagecolorallocate($image, 0, 0, 0);
$red = hexdec(mb_substr($fill_color, 1, 2));
$green = hexdec(mb_substr($fill_color, 3, 2));
$blue = hexdec(mb_substr($fill_color, 4, 2));
$color = imagecolorallocate($image, $red, $green, $blue);
// Trim to remove leading 'MULTIPOLYGON(((' and trailing ')))'
$multipolygon
= mb_substr(
$spatial,
15,
mb_strlen($spatial) - 18
);
// Separate each polygon
$polygons = explode(')),((', $multipolygon);
$first_poly = true;
$points_arr = [];
foreach ($polygons as $polygon) {
// If the polygon doesn't have an inner polygon
if (mb_strpos($polygon, '),(') === false) {
$points_arr = $this->extractPoints($polygon, $scale_data, true);
} else {
// Separate outer and inner polygons
$parts = explode('),(', $polygon);
$outer = $parts[0];
$inner = array_slice($parts, 1);
$points_arr = $this->extractPoints($outer, $scale_data, true);
foreach ($inner as $inner_poly) {
$points_arr = array_merge(
$points_arr,
$this->extractPoints($inner_poly, $scale_data, true)
);
}
}
// draw polygon
@imagefilledpolygon($image, $points_arr, count($points_arr) / 2, $color);
// mark label point if applicable
if (isset($label) && trim($label) != '' && $first_poly) {
$label_point = [
$points_arr[2],
$points_arr[3],
];
}
$first_poly = false;
}
// print label if applicable
if (isset($label_point)) {
imagestring(
$image,
1,
$points_arr[2],
$points_arr[3],
trim((string) $label),
$black
);
}
return $image;
}
/**
* Adds to the TCPDF instance, the data related to a row in the GIS dataset.
*
* @param string $spatial GIS MULTIPOLYGON object
* @param string|null $label Label for the GIS MULTIPOLYGON object
* @param string $fill_color Color for the GIS MULTIPOLYGON 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, $fill_color, array $scale_data, $pdf)
{
// allocate colors
$red = hexdec(mb_substr($fill_color, 1, 2));
$green = hexdec(mb_substr($fill_color, 3, 2));
$blue = hexdec(mb_substr($fill_color, 4, 2));
$color = [
$red,
$green,
$blue,
];
// Trim to remove leading 'MULTIPOLYGON(((' and trailing ')))'
$multipolygon
= mb_substr(
$spatial,
15,
mb_strlen($spatial) - 18
);
// Separate each polygon
$polygons = explode(')),((', $multipolygon);
$first_poly = true;
foreach ($polygons as $polygon) {
// If the polygon doesn't have an inner polygon
if (mb_strpos($polygon, '),(') === false) {
$points_arr = $this->extractPoints($polygon, $scale_data, true);
} else {
// Separate outer and inner polygons
$parts = explode('),(', $polygon);
$outer = $parts[0];
$inner = array_slice($parts, 1);
$points_arr = $this->extractPoints($outer, $scale_data, true);
foreach ($inner as $inner_poly) {
$points_arr = array_merge(
$points_arr,
$this->extractPoints($inner_poly, $scale_data, true)
);
}
}
// draw polygon
$pdf->Polygon($points_arr, 'F*', [], $color, true);
// mark label point if applicable
if (isset($label) && trim($label) != '' && $first_poly) {
$label_point = [
$points_arr[2],
$points_arr[3],
];
}
$first_poly = false;
}
// print label if applicable
if (isset($label_point)) {
$pdf->SetXY($label_point[0], $label_point[1]);
$pdf->SetFontSize(5);
$pdf->Cell(0, 0, trim((string) $label));
}
return $pdf;
}
/**
* Prepares and returns the code related to a row in the GIS dataset as SVG.
*
* @param string $spatial GIS MULTIPOLYGON object
* @param string $label Label for the GIS MULTIPOLYGON object
* @param string $fill_color Color for the GIS MULTIPOLYGON 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, $fill_color, array $scale_data)
{
$polygon_options = [
'name' => $label,
'class' => 'multipolygon vector',
'stroke' => 'black',
'stroke-width' => 0.5,
'fill' => $fill_color,
'fill-rule' => 'evenodd',
'fill-opacity' => 0.8,
];
$row = '';
// Trim to remove leading 'MULTIPOLYGON(((' and trailing ')))'
$multipolygon
= mb_substr(
$spatial,
15,
mb_strlen($spatial) - 18
);
// Separate each polygon
$polygons = explode(')),((', $multipolygon);
foreach ($polygons as $polygon) {
$row .= '<path d="';
// If the polygon doesn't have an inner polygon
if (mb_strpos($polygon, '),(') === false) {
$row .= $this->drawPath($polygon, $scale_data);
} else {
// Separate outer and inner polygons
$parts = explode('),(', $polygon);
$outer = $parts[0];
$inner = array_slice($parts, 1);
$row .= $this->drawPath($outer, $scale_data);
foreach ($inner as $inner_poly) {
$row .= $this->drawPath($inner_poly, $scale_data);
}
}
$polygon_options['id'] = $label . $this->getRandomId();
$row .= '"';
foreach ($polygon_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 MULTIPOLYGON object
* @param int $srid Spatial reference ID
* @param string $label Label for the GIS MULTIPOLYGON object
* @param array $fill_color Color for the GIS MULTIPOLYGON 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, $fill_color, array $scale_data)
{
$fill_opacity = 0.8;
array_push($fill_color, $fill_opacity);
$fill_style = ['color' => $fill_color];
$stroke_style = [
'color' => [0,0,0],
'width' => 0.5,
];
$row = 'var style = new ol.style.Style({'
. 'fill: new ol.style.Fill(' . json_encode($fill_style) . '),'
. 'stroke: new ol.style.Stroke(' . json_encode($stroke_style) . ')';
if ($label) {
$text_style = ['text' => $label];
$row .= ',text: new ol.style.Text(' . json_encode($text_style) . ')';
}
$row .= '});';
if ($srid == 0) {
$srid = 4326;
}
$row .= $this->getBoundsForOl($srid, $scale_data);
// Trim to remove leading 'MULTIPOLYGON(((' and trailing ')))'
$multipolygon
= mb_substr(
$spatial,
15,
mb_strlen($spatial) - 18
);
// Separate each polygon
$polygons = explode(')),((', $multipolygon);
return $row . $this->getPolygonArrayForOpenLayers($polygons, $srid)
. 'var multiPolygon = new ol.geom.MultiPolygon(polygonArray);'
. 'var feature = new ol.Feature(multiPolygon);'
. 'feature.setStyle(style);'
. 'vectorLayer.addFeature(feature);';
}
/**
* Draws a ring of the polygon using SVG path element.
*
* @param string $polygon The ring
* @param array $scale_data Array containing data related to scaling
*
* @return string the code to draw the ring
*
* @access private
*/
private function drawPath($polygon, array $scale_data)
{
$points_arr = $this->extractPoints($polygon, $scale_data);
$row = ' M ' . $points_arr[0][0] . ', ' . $points_arr[0][1];
$other_points = array_slice($points_arr, 1, count($points_arr) - 2);
foreach ($other_points as $point) {
$row .= ' L ' . $point[0] . ', ' . $point[1];
}
$row .= ' Z ';
return $row;
}
/**
* 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 = '')
{
$data_row = $gis_data[$index]['MULTIPOLYGON'];
$no_of_polygons = $data_row['no_of_polygons'] ?? 1;
if ($no_of_polygons < 1) {
$no_of_polygons = 1;
}
$wkt = 'MULTIPOLYGON(';
for ($k = 0; $k < $no_of_polygons; $k++) {
$no_of_lines = $data_row[$k]['no_of_lines'] ?? 1;
if ($no_of_lines < 1) {
$no_of_lines = 1;
}
$wkt .= '(';
for ($i = 0; $i < $no_of_lines; $i++) {
$no_of_points = $data_row[$k][$i]['no_of_points'] ?? 4;
if ($no_of_points < 4) {
$no_of_points = 4;
}
$wkt .= '(';
for ($j = 0; $j < $no_of_points; $j++) {
$wkt .= (isset($data_row[$k][$i][$j]['x'])
&& trim((string) $data_row[$k][$i][$j]['x']) != ''
? $data_row[$k][$i][$j]['x'] : $empty)
. ' ' . (isset($data_row[$k][$i][$j]['y'])
&& trim((string) $data_row[$k][$i][$j]['y']) != ''
? $data_row[$k][$i][$j]['y'] : $empty) . ',';
}
$wkt
= mb_substr(
$wkt,
0,
mb_strlen($wkt) - 1
);
$wkt .= '),';
}
$wkt
= mb_substr(
$wkt,
0,
mb_strlen($wkt) - 1
);
$wkt .= '),';
}
$wkt
= mb_substr(
$wkt,
0,
mb_strlen($wkt) - 1
);
return $wkt . ')';
}
/**
* Generate the WKT for the data from ESRI shape files.
*
* @param array $row_data GIS data
*
* @return string the WKT for the data from ESRI shape files
*
* @access public
*/
public function getShape(array $row_data)
{
// Determines whether each line ring is an inner ring or an outer ring.
// If it's an inner ring get a point on the surface which can be used to
// correctly classify inner rings to their respective outer rings.
foreach ($row_data['parts'] as $i => $ring) {
$row_data['parts'][$i]['isOuter']
= GisPolygon::isOuterRing($ring['points']);
}
// Find points on surface for inner rings
foreach ($row_data['parts'] as $i => $ring) {
if ($ring['isOuter']) {
continue;
}
$row_data['parts'][$i]['pointOnSurface']
= GisPolygon::getPointOnSurface($ring['points']);
}
// Classify inner rings to their respective outer rings.
foreach ($row_data['parts'] as $j => $ring1) {
if ($ring1['isOuter']) {
continue;
}
foreach ($row_data['parts'] as $k => $ring2) {
if (! $ring2['isOuter']) {
continue;
}
// If the pointOnSurface of the inner ring
// is also inside the outer ring
if (! GisPolygon::isPointInsidePolygon(
$ring1['pointOnSurface'],
$ring2['points']
)
) {
continue;
}
if (! isset($ring2['inner'])) {
$row_data['parts'][$k]['inner'] = [];
}
$row_data['parts'][$k]['inner'][] = $j;
}
}
$wkt = 'MULTIPOLYGON(';
// for each polygon
foreach ($row_data['parts'] as $ring) {
if (! $ring['isOuter']) {
continue;
}
$wkt .= '('; // start of polygon
$wkt .= '('; // start of outer ring
foreach ($ring['points'] as $point) {
$wkt .= $point['x'] . ' ' . $point['y'] . ',';
}
$wkt
= mb_substr(
$wkt,
0,
mb_strlen($wkt) - 1
);
$wkt .= ')'; // end of outer ring
// inner rings if any
if (isset($ring['inner'])) {
foreach ($ring['inner'] as $j) {
$wkt .= ',('; // start of inner ring
foreach ($row_data['parts'][$j]['points'] as $innerPoint) {
$wkt .= $innerPoint['x'] . ' ' . $innerPoint['y'] . ',';
}
$wkt
= mb_substr(
$wkt,
0,
mb_strlen($wkt) - 1
);
$wkt .= ')'; // end of inner ring
}
}
$wkt .= '),'; // end of polygon
}
$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 Value of the GIS column
* @param int $index Index of the geometry
*
* @return array params for the GIS data editor from the value of the GIS column
*
* @access public
*/
public function generateParams($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'] = 'MULTIPOLYGON';
$wkt = $value;
}
// Trim to remove leading 'MULTIPOLYGON(((' and trailing ')))'
$multipolygon
= mb_substr(
$wkt,
15,
mb_strlen($wkt) - 18
);
// Separate each polygon
$polygons = explode(')),((', $multipolygon);
$param_row =& $params[$index]['MULTIPOLYGON'];
$param_row['no_of_polygons'] = count($polygons);
$k = 0;
foreach ($polygons as $polygon) {
// If the polygon doesn't have an inner polygon
if (mb_strpos($polygon, '),(') === false) {
$param_row[$k]['no_of_lines'] = 1;
$points_arr = $this->extractPoints($polygon, null);
$no_of_points = count($points_arr);
$param_row[$k][0]['no_of_points'] = $no_of_points;
for ($i = 0; $i < $no_of_points; $i++) {
$param_row[$k][0][$i]['x'] = $points_arr[$i][0];
$param_row[$k][0][$i]['y'] = $points_arr[$i][1];
}
} else {
// Separate outer and inner polygons
$parts = explode('),(', $polygon);
$param_row[$k]['no_of_lines'] = count($parts);
$j = 0;
foreach ($parts as $ring) {
$points_arr = $this->extractPoints($ring, null);
$no_of_points = count($points_arr);
$param_row[$k][$j]['no_of_points'] = $no_of_points;
for ($i = 0; $i < $no_of_points; $i++) {
$param_row[$k][$j][$i]['x'] = $points_arr[$i][0];
$param_row[$k][$j][$i]['y'] = $points_arr[$i][1];
}
$j++;
}
}
$k++;
}
return $params;
}
}
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