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<?php
namespace Cgi\Calc\Func;
use Cgi\Calc\FunctionInterface;
use Cgi\Calc\Point;
class LinearFunction implements FunctionInterface
{
/** @var float */
private $k;
private $n;
/**
* @param float $k
* @param float $n
*/
public function __construct($k, $n)
$this->k = $k;
$this->n = $n;
}
* @param Point $a
* @param Point $b
*
* @return LinearFunction
* @throws \RuntimeException When $a and $b points have same x
public static function fromTwoPoints(Point $a, Point $b)
if ($a->getX() === $b->getX()) {
throw new \RuntimeException('Line can be defined only by two points with different X');
$k = ($a->getY() - $b->getY()) / ($a->getX() - $b->getX());
$n = $a->getY() - $k * $a->getX();
return new LinearFunction($k, $n);
* @param float $x
* @return float
public function evaluate($x)
return $this->k * $x + $this->n;
tmilos /
cgi-calc
