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