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<?php
declare(strict_types=1);
namespace PrinsFrank\PhpGeoSVG\Projection;
use PrinsFrank\PhpGeoSVG\Geometry\Position\Position;
abstract class AbstractCylindricalEqualAreaProjection implements Projection
{
abstract public function getWidthToHeightAspectRatio(): float;
public function getX(Position $position): float
return ($position->longitude - Position::MIN_LONGITUDE) * $this->getWidthToHeightAspectRatio() / 2;
}
public function getY(Position $position): float
return (-sin(deg2rad($position->latitude)) + 1) * .5 * Position::TOTAL_LATITUDE;
public function getMaxX(): float
return $this->getMaxY() * $this->getWidthToHeightAspectRatio();
public function getMaxY(): float
return Position::TOTAL_LATITUDE;
public function getMaxLatitude(): float
return Position::MAX_LATITUDE;
PrinsFrank /
php-geo-svg
