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<?php |
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/* |
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* This file is part of the CGI-Calc package. |
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* |
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* (c) Milos Tomic <[email protected]> |
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* |
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* This source file is subject to the MIT license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace Cgi\Calc\Field; |
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use Cgi\Calc\Point; |
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use Cgi\Calc\Point\PointSet; |
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class CircularCenterRadius extends AbstractFieldProducer |
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{ |
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/** @var Point */ |
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private $center; |
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/** @var int */ |
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private $radius; |
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/** @var bool */ |
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private $fill; |
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/** |
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* @param Point $center |
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* @param int $radius |
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* @param ValueProvider|callable $valueProvider |
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*/ |
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public function __construct(Point $center, $radius, $fill, $valueProvider = null) |
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{ |
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parent::__construct($valueProvider); |
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if (false === is_int($radius) || $radius < 0) { |
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throw new \InvalidArgumentException('Radius must be non-negative integer'); |
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} |
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$this->center = $center; |
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$this->radius = $radius; |
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$this->fill = (bool) $fill; |
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} |
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/** |
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* @return PointSet |
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*/ |
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public function produce() |
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{ |
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/* |
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* Bressenham's Midpoint Circle algorithm |
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* http://stackoverflow.com/questions/1022178/how-to-make-a-circle-on-a-grid |
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* http://rosettacode.org/wiki/Bitmap/Midpoint_circle_algorithm |
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*/ |
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$d = 3 - (2 * $this->radius); |
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$x = 0; |
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$y = $this->radius; |
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$result = new PointSet(); |
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do { |
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$this->addRow( |
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$result, |
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new Point($this->center->getX() + $x, $this->center->getY() + $y), |
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new Point($this->center->getX() - $x, $this->center->getY() + $y) |
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); |
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$this->addRow( |
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$result, |
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new Point($this->center->getX() - $x, $this->center->getY() - $y), |
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new Point($this->center->getX() + $x, $this->center->getY() - $y) |
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); |
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$this->addRow( |
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$result, |
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new Point($this->center->getX() - $y, $this->center->getY() + $x), |
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new Point($this->center->getX() + $y, $this->center->getY() + $x) |
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); |
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$this->addRow( |
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$result, |
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new Point($this->center->getX() - $y, $this->center->getY() - $x), |
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new Point($this->center->getX() + $y, $this->center->getY() - $x) |
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); |
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if ($d < 0) { |
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$d = $d + (4 * $x) + 6; |
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} else { |
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$d = $d + 4 * ($x - $y) + 10; |
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--$y; |
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} |
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++$x; |
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} while ($x <= $y); |
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return $result; |
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} |
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/** |
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* @param PointSet $result |
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* @param Point $a |
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* @param Point $b |
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*/ |
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private function addRow(PointSet $result, Point $a, Point $b) |
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{ |
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if ($a->getX() > $b->getX()) { |
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$t = $a; |
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$a = $b; |
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$b = $t; |
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} |
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if ($this->fill) { |
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foreach ($a->forXUpTo($b) as $x) { |
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$this->addPoint($result, new Point($x, $a->getY())); |
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} |
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} else { |
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$this->addPoint($result, $a); |
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$this->addPoint($result, $b); |
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} |
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} |
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/** |
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* @param PointSet $result |
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* @param Point $point |
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*/ |
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private function addPoint(PointSet $result, Point $point) |
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{ |
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$value = $this->getValue($point); |
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$result->attach($point, $value); |
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} |
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} |
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tmilos /
cgi-calc
