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<?php |
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/** |
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* Simplify Polyline with the Douglas-Peucker-Algorithm |
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* |
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* The Algorithm is described here: |
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* http://en.wikipedia.org/wiki/Ramer%E2%80%93Douglas%E2%80%93Peucker_algorithm |
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* |
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* The formula for the Perpendicular Distance is described here: |
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* http://biodiversityinformatics.amnh.org/open_source/pdc/documentation.php |
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* |
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* @author Marcus Jaschen <[email protected]> |
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* @license https://opensource.org/licenses/GPL-3.0 GPL |
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* @link https://github.com/mjaschen/phpgeo |
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*/ |
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namespace Location\Processor\Polyline; |
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use Location\Coordinate; |
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use Location\Line; |
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use Location\Polyline; |
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/** |
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* Simplify Polyline with the Douglas-Peucker-Algorithm |
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* |
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* @author Marcus Jaschen <[email protected]> |
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* @license https://opensource.org/licenses/GPL-3.0 GPL |
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* @link https://github.com/mjaschen/phpgeo |
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*/ |
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class SimplifyDouglasPeucker implements SimplifyInterface |
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{ |
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/** |
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* @var float |
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*/ |
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private $tolerance; |
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/** |
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* @param float $tolerance the perpendicular distance threshold in meters |
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*/ |
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public function __construct($tolerance) |
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{ |
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$this->tolerance = $tolerance; |
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} |
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/** |
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* @param \Location\Polyline $polyline |
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* |
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* @return \Location\Polyline |
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*/ |
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View Code Duplication |
public function simplify(Polyline $polyline) |
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{ |
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$resultPolyline = new Polyline(); |
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$simplifiedLine = $this->douglasPeucker($polyline->getPoints()); |
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foreach ($simplifiedLine as $point) { |
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$resultPolyline->addPoint($point); |
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} |
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return $resultPolyline; |
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} |
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/** |
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* @param array $line |
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* |
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* @return array |
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*/ |
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protected function douglasPeucker(array $line) |
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{ |
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$distanceMax = 0; |
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$index = 0; |
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$lineSize = count($line); |
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View Code Duplication |
for ($i = 1; $i <= ($lineSize - 1); $i ++) { |
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$distance = $this->getPerpendicularDistance($line[$i], new Line($line[0], $line[$lineSize - 1])); |
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if ($distance > $distanceMax) { |
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$index = $i; |
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$distanceMax = $distance; |
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} |
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} |
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if ($distanceMax > $this->tolerance) { |
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$lineSplitFirst = array_slice($line, 0, $index); |
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$lineSplitSecond = array_slice($line, $index, $lineSize); |
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$resultsSplit1 = $this->douglasPeucker($lineSplitFirst); |
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$resultsSplit2 = $this->douglasPeucker($lineSplitSecond); |
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array_pop($resultsSplit1); |
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return array_merge($resultsSplit1, $resultsSplit2); |
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} |
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return [$line[0], $line[$lineSize - 1]]; |
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} |
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/** |
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* @param Coordinate $point |
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* @param Line $line |
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* |
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* @return number |
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*/ |
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View Code Duplication |
protected function getPerpendicularDistance(Coordinate $point, Line $line) |
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{ |
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$ellipsoid = $point->getEllipsoid(); |
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$ellipsoidRadius = $ellipsoid->getArithmeticMeanRadius(); |
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$firstLinePointLat = $this->deg2radLatitude($line->getPoint1()->getLat()); |
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$firstLinePointLng = $this->deg2radLongitude($line->getPoint1()->getLng()); |
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$firstLinePointX = $ellipsoidRadius * cos($firstLinePointLng) * sin($firstLinePointLat); |
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$firstLinePointY = $ellipsoidRadius * sin($firstLinePointLng) * sin($firstLinePointLat); |
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$firstLinePointZ = $ellipsoidRadius * cos($firstLinePointLat); |
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$secondLinePointLat = $this->deg2radLatitude($line->getPoint2()->getLat()); |
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$secondLinePointLng = $this->deg2radLongitude($line->getPoint2()->getLng()); |
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$secondLinePointX = $ellipsoidRadius * cos($secondLinePointLng) * sin($secondLinePointLat); |
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$secondLinePointY = $ellipsoidRadius * sin($secondLinePointLng) * sin($secondLinePointLat); |
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$secondLinePointZ = $ellipsoidRadius * cos($secondLinePointLat); |
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$pointLat = $this->deg2radLatitude($point->getLat()); |
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$pointLng = $this->deg2radLongitude($point->getLng()); |
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$pointX = $ellipsoidRadius * cos($pointLng) * sin($pointLat); |
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$pointY = $ellipsoidRadius * sin($pointLng) * sin($pointLat); |
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$pointZ = $ellipsoidRadius * cos($pointLat); |
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$normalizedX = $firstLinePointY * $secondLinePointZ - $firstLinePointZ * $secondLinePointY; |
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$normalizedY = $firstLinePointZ * $secondLinePointX - $firstLinePointX * $secondLinePointZ; |
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$normalizedZ = $firstLinePointX * $secondLinePointY - $firstLinePointY * $secondLinePointX; |
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$length = sqrt($normalizedX * $normalizedX + $normalizedY * $normalizedY + $normalizedZ * $normalizedZ); |
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$normalizedX /= $length; |
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$normalizedY /= $length; |
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$normalizedZ /= $length; |
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$thetaPoint = $normalizedX * $pointX + $normalizedY * $pointY + $normalizedZ * $pointZ; |
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$length = sqrt($pointX * $pointX + $pointY * $pointY + $pointZ * $pointZ); |
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$thetaPoint /= $length; |
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$distance = abs((M_PI / 2) - acos($thetaPoint)); |
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return $distance * $ellipsoidRadius; |
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} |
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/** |
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* @param float $latitude |
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* |
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* @return float |
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*/ |
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protected function deg2radLatitude($latitude) |
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{ |
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return deg2rad(90 - $latitude); |
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} |
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/** |
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* @param float $longitude |
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* |
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* @return float |
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*/ |
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protected function deg2radLongitude($longitude) |
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{ |
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if ($longitude > 0) { |
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return deg2rad($longitude); |
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} |
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return deg2rad($longitude + 360); |
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} |
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} |
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mjaschen /
phpgeo
Loading history...
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.