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<?php
/**
* Geo galaxy class.
*
* Zed. The immensity of stars. The HyperShip. The people.
*
* (c) 2010, Dereckson, some rights reserved.
* Released under BSD license.
*
* A 3D grid of objects
*
* 0.1 2010-02-08 14:02 DcK
*
* @package Zed
* @subpackage Geo
* @author Sébastien Santoro aka Dereckson <dereckson@espace-win.org>
* @copyright 2010 Sébastien Santoro aka Dereckson
* @license http://www.opensource.org/licenses/bsd-license.php BSD
* @version 0.1
* @link http://scherzo.dereckson.be/doc/zed
* @link http://zed.dereckson.be/
* @filesource
*/
/**
* Geo galaxy class
*
* This class provides methods to convert coordinate polars.
*
* @todo add a cartesian_to_polar method
* @todo add a static method to get a grid of all the galaxy objects, with their x y z representation ; that will be useful to add in API, for a javascript galaxy viewer.
*
* @todo create a unit testing file dev/tests/GeoGalaxyTest.php
* @todo add unit testing for the normalize_angle method in dev/tests/GeoGalaxyTest.php
* @todo add unit testing for the polar_to_cartesian method
*/
class GeoGalaxy {
/*
* ----------------------------------------------------------------------- *
* Helper methods - math
* ----------------------------------------------------------------------- *
*/
/**
* Normalizes an angle, so 0 =< angle < 2 PI
*
* @param float $angle angle in radians (use deg2rad() if you've degrees)
* @return an angle in the 0 =< angle < 2 PI interval
*/
static function normalize_angle ($angle) {
while ($angle < 0) {
$angle += 2 * M_PI;
}
while ($angle >= 2 * M_PI) {
$angle -= 2 * M_PI;
}
return $angle;
}
/*
* Converts polar coordinates in cartesian x y coordinates
* @param float $angle angle in radians (use deg2rad() if you've degrees)
* @param float $height height
* @return array an array of 2 float items: x, y
*/
static function polar_to_cartesian ($angle, $height) {
//A story of numbers
if ($height < 0) {
//Adds 180° and gets absolute value
$height *= -1;
$angle + M_PI;
}
$x = abs(sin($angle)) . $height;
$y = abs(cos($angle)) . $height;
//And now, the sign
//Returns our coordinates
return array($x, $y);
}
}

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