closedquestion-8.x-3.x-dev/src/Question/Mapping/CqHotspotCircle.php

<?php

namespace Drupal\closedquestion\Question\Mapping;

/**
 * Class CqHotspotCircle.
 *
 * Implements a circle-shaped hotspot formed by a centre point and a radius.
 *
 * @package Drupal\closedquestion\Question\Mapping
 */
class CqHotspotCircle extends CqAbstractHotspot {

  /**
   * The x-coordinate of the center of the hotspot.
   *
   * @var int
   */
  private $x = 0;

  /**
   * The y-coordinate of the center of the hotspot.
   *
   * @var int
   */
  private $y = 0;

  /**
   * The radius of the hotspot.
   *
   * @var int
   */
  private $radius = 0;

  /**
   * The square of the radius.
   *
   * Its stored, so we don't need to re-calculate this or the root
   * when calculating a distance from the center.
   *
   * @var int
   */
  private $radius2 = 0;

  /**
   * Creates a new CqHotspotCircle.
   *
   * @param string $identifier
   *   The identifier to use for this hotspot.
   * @param int $x
   *   The x-coordinate of the center of the hotspot.
   * @param int $y
   *   The y-coordinate of the center of the hotspot.
   * @param int $radius
   *   The radius of the hotpot.
   */
  public function __construct($identifier, $x, $y, $radius) {
    $this->identifier = $identifier;
    $this->x = $x;
    $this->y = $y;
    $this->radius = $radius;
    $this->radius2 = $radius * $radius;
  }

  /**
   * Implements CqHotspotInterface::doMatch()
   */
  public function doMatch($location) {
    $x = $location[0];
    $y = $location[1];
    $dist2 = pow($this->x - $x, 2) + pow($this->y - $y, 2);
    return ($dist2 < $this->radius2);
  }

  /**
   * Implements CqHotspotInterface::getMapHtml()
   */
  public function getMapHtml() {
    return 'shape="circle" coords="' . $this->x . ',' . $this->y . ',' . $this->radius . '"';
  }

  /**
   * Implements CqHotspotInterface::getMapData()
   */
  public function getMapData() {
    return array('shape' => 'circle', 'coords' => $this->x . ',' . $this->y . ',' . $this->radius);
  }

}