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<?php
/**
* Geo octocube class.
*
* Zed. The immensity of stars. The HyperShip. The people.
*
* (c) 2010, Dereckson, some rights reserved.
* Released under BSD license.
*
* @package Zed
* @subpackage Geo
* @author S饕astien Santoro aka Dereckson <dereckson@espace-win.org>
* @copyright 2010 S饕astien 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 octocube class
*
* An octocube is a cube divided in 8 parts (sliced in two in x, y and z)
*
* The coordinates (0, 0, 0) represents the octocube center.
*/
class GeoOctocube {
/**
* Gets the sector from the (x, y, z) specified coordinates
*
* Sector will be:
* <code>
* // _____ _____
* // / 5 / 6 /|
* // /- - -/- - -/ |
* // /_____/____ /| |
* // | | | |/|
* // | 7 | 8 | / | 2
* // |_____|_____|/| |
* // | | | |/
* // | 3 | 4 | /
* // |_____|_____|/
* </code>
*
* @param int $x the x coordinate
* @param int $y the y coordinate
* @param int $z the z coordinate
* @return int the number of the sector (0 if x = y = z = 0 ; otherwise, 1 to 8)
*/
static function get_sector ($x, $y, $z) {
//Cube center
if ($x == 0 && $y == 0 && $z == 0) return 0;
//One of the 8 cubes
$sector = 1;
if ($x >= 0) $sector++; //we're at right
if ($y < 0) $sector += 2; //we're at bottom
if ($z >= 0) $sector += 4; //we're on the top layer
return $sector;
}
/**
* Gets the sector from the (x, y, z) specified coordinates
* @see get_sector
*
* @param mixed $pt a GeoPoint3D object for the x, y, z coordinates or a parsable string
* @return int the number of the sector (0 if x = y = z 0 ; otherwise, 1 to 8)
*/
static function get_sector_from_point3D ($pt) {
if (is_string($pt)) {
$pt = GeoPoint3D::fromString($pt);
}
return self::get_sector($pt->x, $pt->y, $pt->z);
}
/**
* Gets the base vector for the specified sector
*
* Example code:
*
* $vector = GeoOctocube::get_base_vector(4);
* //$vector is a (1, -1, -1) array
*
* @param int $sector the sector number (0-8)
* @return array if the sector is 0, (0, 0, 0) ; otherwise, an array with three signed 1 values.
*/
static function get_base_vector ($sector) {
switch ($sector) {
case 0: return array(0, 0, 0);
case 1: return array(-1, 1, -1);
case 2: return array(1, 1, -1);
case 3: return array(-1, -1, -1);
case 4: return array(1, -1, -1);
case 5: return array(-1, 1, 1);
case 6: return array(1, 1, 1);
case 7: return array(-1, -1, 1);
case 8: return array(1, -1, 1);
default: message_die(GENERAL_ERROR, "Invalid sector: $sector", "GeoOctocube::get_base_vector");
}
}
/**
* Gets SQL RLIKE pattern for the specified sector
*
* @param int $sector the sector number (0-8)
* @param int $z if not null, limits the query to the specified z coordinate [optional]
* @return string a SQL clause like "([0-9]+, -[0,9]+, [0,9]+)"
*/
static function get_rlike_pattern_from_sector ($sector, $z = null) {
if ($sector == 0) return "(0, 0, 0)";
$vector = self::get_base_vector($sector);
//x
if ($vector[0] == 1)
$query = "([0-9]+, ";
else
$query = "(-[0-9]+, ";
//y
if ($vector[1] == 1)
$query .= "[0-9]+, ";
else
$query .= "-[0-9]+, ";
//z
if ($z !== null) {
$query .= "$z)";
} elseif ($vector[2] == "1") {
$query .= "[0-9]+)";
} else {
$query .= "-[0-9]+)";
}
return $query;
}
}

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