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<?php |
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/* |
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* This file is part of the core-library package. |
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* |
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* (c) 2020 WEBEWEB |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace WBW\Library\Core\Geometry; |
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/** |
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* Line. |
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* |
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* @author webeweb <https://github.com/webeweb> |
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* @package WBW\Library\Core\Geometry |
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*/ |
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class Line { |
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/** |
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* Point "A". |
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* |
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* @var Point |
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*/ |
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private $a; |
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/** |
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* Point "B". |
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* |
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* @var Point |
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*/ |
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private $b; |
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/** |
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* Constructor. |
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* |
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* @param Point $a The point "A". |
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* @param Point $b The point "B". |
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*/ |
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public function __construct(Point $a = null, Point $b = null) { |
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$this->setA($a); |
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$this->setB($b); |
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} |
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/** |
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* Get the point "A". |
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* |
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* @return Point Returns the point "A". |
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*/ |
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public function getA() { |
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return $this->a; |
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} |
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/** |
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* Get the point "B". |
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* |
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* @return Point Returns the point "B". |
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*/ |
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public function getB() { |
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return $this->b; |
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} |
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/** |
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* Originally abscissa y = mx + b. |
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* |
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* @return Point Returns the originally abscissa. |
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*/ |
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public function originallyAbscissa() { |
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$m = $this->getB()->m($this->getA()); |
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$b = $this->originallyOrdered()->getY(); |
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// x = (y - b) / m |
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$x = (0 - $b) / $m; |
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return new Point($x, 0); |
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} |
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/** |
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* Originally ordered y = mx + b. |
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* |
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* @return Point Returns the originally ordered. |
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*/ |
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public function originallyOrdered() { |
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$m = $this->getB()->m($this->getA()); |
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$mx = $m * $this->getB()->getX(); |
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// b = y - mx |
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$b = $this->getB()->getY() - $mx; |
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return new Point(0, $b); |
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} |
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/** |
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* Set the point "A". |
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* |
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* @param Point $a The point "A". |
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* @return Line Returns this line. |
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*/ |
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public function setA(Point $a = null) { |
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$this->a = $a; |
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return $this; |
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} |
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/** |
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* Set the point "B". |
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* |
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* @param Point $b The point "B". |
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* @return Line Returns this line. |
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*/ |
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public function setB(Point $b = null) { |
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$this->b = $b; |
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return $this; |
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} |
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} |
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webeweb /
core-library
