melder/vendor/Shapefile/Geometry/Polygon.php
2024-03-13 12:03:56 +01:00

342 lines
10 KiB
PHP

<?php
/**
* PHP Shapefile - PHP library to read and write ESRI Shapefiles, compatible with WKT and GeoJSON
*
* @package Shapefile
* @author Gaspare Sganga
* @version 4.0.0dev
* @license MIT
* @link https://gasparesganga.com/labs/php-shapefile/
*/
namespace Shapefile\Geometry;
use Shapefile\Shapefile;
use Shapefile\ShapefileException;
/**
* Polygon Geometry.
*
* - Array: [
* [numrings] => int
* [rings] => [
* [
* [numpoints] => int
* [points] => [
* [
* [x] => float
* [y] => float
* [z] => float
* [m] => float/bool
* ]
* ]
* ]
* ]
* ]
*
* - WKT:
* POLYGON [Z][M] ((x y z m, x y z m, x y z m, x y z m), (x y z m, x y z m, x y z m))
*
* - GeoJSON:
* {
* "type": "Polygon" / "PolygonM"
* "coordinates": [
* [
* [x, y, z] / [x, y, m] / [x, y, z, m]
* ]
* ]
* }
*/
class Polygon extends MultiLinestring
{
/**
* WKT and GeoJSON basetypes, collection class type
*/
const WKT_BASETYPE = 'POLYGON';
const GEOJSON_BASETYPE = 'Polygon';
const COLLECTION_CLASS = 'Linestring';
/**
* @var int Action to perform on polygon rings.
*/
private $closed_rings;
/**
* @var int Orientation to force for polygon rings.
*/
private $force_orientation;
/////////////////////////////// PUBLIC ///////////////////////////////
/**
* Constructor.
*
* @param \Shapefile\Geometry\Linestring[] $linestrings Optional array of linestrings to initialize the polygon.
* @param int $closed_rings Optional action to perform on polygon rings. Possible values:
* - Shapefile::ACTION_IGNORE
* - Shapefile::ACTION_CHECK
* - Shapefile::ACTION_FORCE
* @param int $force_orientation Optional orientation to force for polygon rings. Possible values:
* - Shapefile::ORIENTATION_CLOCKWISE
* - Shapefile::ORIENTATION_COUNTERCLOCKWISE
* - Shapefile::ORIENTATION_UNCHANGED
*/
public function __construct(array $linestrings = null, $closed_rings = Shapefile::ACTION_CHECK, $force_orientation = Shapefile::ORIENTATION_COUNTERCLOCKWISE)
{
$this->closed_rings = $closed_rings;
$this->force_orientation = $force_orientation;
parent::__construct($linestrings);
}
public function initFromArray($array)
{
$this->checkInit();
if (!isset($array['rings']) || !is_array($array['rings'])) {
throw new ShapefileException(Shapefile::ERR_INPUT_ARRAY_NOT_VALID);
}
foreach ($array['rings'] as $part) {
if (!isset($part['points']) || !is_array($part['points'])) {
throw new ShapefileException(Shapefile::ERR_INPUT_ARRAY_NOT_VALID);
}
$Linestring = new Linestring();
foreach ($part['points'] as $coordinates) {
$Point = new Point();
$Point->initFromArray($coordinates);
$Linestring->addPoint($Point);
}
$this->addRing($Linestring);
}
return $this;
}
public function getArray()
{
$rings = [];
foreach ($this->getLinestrings() as $Linestring) {
$rings[] = $Linestring->getArray();
}
return [
'numrings' => $this->getNumGeometries(),
'rings' => $rings,
];
}
/**
* Adds a ring to the collection.
*
* @param \Shapefile\Geometry\Linestring $Linestring
*
* @return self Returns $this to provide a fluent interface.
*/
public function addRing(Linestring $Linestring)
{
$this->addGeometry($Linestring);
return $this;
}
/**
* Gets a ring at specified index from the collection.
*
* @param int $index The index of the ring.
*
* @return \Shapefile\Geometry\Linestring
*/
public function getRing($index)
{
return $this->getGeometry($index);
}
/**
* Gets all the rings in the collection.
*
* @return \Shapefile\Geometry\Linestring[]
*/
public function getRings()
{
return $this->getGeometries();
}
/**
* Gets the number of rings in the collection.
*
* @return int
*/
public function getNumRings()
{
return $this->getNumGeometries();
}
/**
* Gets the polygon outer ring.
*
* @return \Shapefile\Geometry\Linestring
*/
public function getOuterRing()
{
return $this->isEmpty() ? null : $this->getRing(0);
}
/**
* Gets polygon inners rings.
*
* @return \Shapefile\Geometry\Linestring[]
*/
public function getInnerRings()
{
return array_slice($this->getRings(), 1);
}
/**
* Forces polygon rings to be closed.
*
* @return self Returns $this to provide a fluent interface.
*/
public function forceClosedRings()
{
foreach ($this->getRings() as $Linestring) {
$Linestring->forceClosedRing();
}
return $this;
}
/**
* Checks whether polygon outer ring has a clockwise orientation and all the inner rings have a counterclockwise one.
* Note that a false return value does not guarantee polygon is strictly counterclockwise. Use Polygon::forceCounterClockwise() to enforce that!
*
* Returns Shapefile::UNDEFINED if geometry is empty.
*
* @return bool|Shapefile::UNDEFINED
*/
public function isClockwise()
{
if ($this->isEmpty()) {
return Shapefile::UNDEFINED;
}
if ($this->getOuterRing()->isClockwise(true) === false) {
return false;
}
foreach ($this->getInnerRings() as $Linestring) {
if ($Linestring->isClockwise(true) === true) {
return false;
}
}
return true;
}
/**
* Checks whether polygon outer ring has a counterclockwise orientation and all the inner rings have a clockwise one.
* Note that a false return value does not guarantee polygon is strictly clockwise. Use Polygon::forceClockwise() to enforce that!
*
* Returns Shapefile::UNDEFINED if geometry is empty.
*
* @return bool|Shapefile::UNDEFINED
*/
public function isCounterClockwise()
{
if ($this->isEmpty()) {
return Shapefile::UNDEFINED;
}
if ($this->getOuterRing()->isClockwise(true) === true) {
return false;
}
foreach ($this->getInnerRings() as $Linestring) {
if ($Linestring->isClockwise(true) === false) {
return false;
}
}
return true;
}
/**
* Forces polygon outer ring to have a clockwise orientation and all the inner rings to have a counterclockwise one.
*
* @return self Returns $this to provide a fluent interface.
*/
public function forceClockwise()
{
if (!$this->isEmpty()) {
$this->getOuterRing()->forceClockwise();
foreach ($this->getInnerRings() as $Linestring) {
$Linestring->forceCounterClockwise();
}
}
return $this;
}
/**
* Forces polygon outer ring to have a counterclockwise orientation and all the inner rings to have a clockwise one.
*
* @return self Returns $this to provide a fluent interface.
*/
public function forceCounterClockwise()
{
if (!$this->isEmpty()) {
$this->getOuterRing()->forceCounterClockwise();
foreach ($this->getInnerRings() as $Linestring) {
$Linestring->forceClockwise();
}
}
return $this;
}
public function getSHPBasetype()
{
return Shapefile::SHAPE_TYPE_POLYGON;
}
/////////////////////////////// PROTECTED ///////////////////////////////
/**
* Performs selected action and eventually forces orientation for polygon rings.
*
* @param \Shapefile\Geometry\Geometry $Linestring
*
* @return self Returns $this to provide a fluent interface.
*/
protected function addGeometry(Geometry $Linestring)
{
parent::addGeometry($Linestring);
// Closed rings
if ($this->closed_rings == Shapefile::ACTION_FORCE) {
$Linestring->forceClosedRing();
} elseif ($this->closed_rings == Shapefile::ACTION_CHECK && !$Linestring->isClosedRing()) {
throw new ShapefileException(Shapefile::ERR_GEOM_POLYGON_OPEN_RING);
}
// Orientation
if ($this->force_orientation == Shapefile::ORIENTATION_CLOCKWISE) {
$Linestring->{($this->getNumGeometries() == 1) ? 'forceClockwise' : 'forceCounterClockwise'}();
} elseif ($this->force_orientation == Shapefile::ORIENTATION_COUNTERCLOCKWISE) {
$Linestring->{($this->getNumGeometries() == 1) ? 'forceCounterClockwise' : 'forceClockwise'}();
}
return $this;
}
protected function getWKTBasetype()
{
return static::WKT_BASETYPE;
}
protected function getGeoJSONBasetype()
{
return static::GEOJSON_BASETYPE;
}
protected function getCollectionClass()
{
return __NAMESPACE__ . '\\' . static::COLLECTION_CLASS;
}
}