Distance class

Moved the convert unit logic out of the Convert class. Added a method to calculate distances between 2 points

classes/Convert.php

@@ -18,8 +18,8 @@
 /**
  * Convert Class
  *
- * Collection of statically called methods to help aid in converting formats as
- * well as distances.
+ * Collection of statically called methods to help aid in converting data
+ * formats.
  */
 class Convert
 {
@@ -117,23 +117,6 @@ class Convert
 		return $xml;
 	}
 
-	// }}}
-	// {{{ Meters to Miles
-
-	/**
-	 * Meters to Miles
-	 *
-	 * Converts meters to miles.
-	 *
-	 * @static
-	 * @param  mixed $meters meters to convert to miles
-	 * @return mixed number of miles
-	 */
-	public static function metersToMiles($meters)
-	{
-		return $meters * 0.00062137119;
-	}
-
 	// }}}
 	// {{{ To JSON
 

classes/Distance.php

@@ -0,0 +1,145 @@
+<?php
+
+/**
+ * Distance
+ *
+ * PHP version 5
+ *
+ * Licensed under The MIT License
+ * Redistribution of these files must retain the above copyright notice.
+ *
+ * @author    Josh Sherman <pickles@joshtronic.com>
+ * @copyright Copyright 2007-2012, Josh Sherman
+ * @license   http://www.opensource.org/licenses/mit-license.html
+ * @package   PICKLES
+ * @link      https://github.com/joshtronic/pickles
+ */
+
+/**
+ * Distance Class
+ *
+ * Collection of statically called methods to help aid distance-related
+ * conversions and calculations.
+ */
+class Distance
+{
+	// {{{ Call Static
+
+	/**
+	 * Call Static
+	 *
+	 * Magic method to power the unit conversion without much code.
+	 *
+	 * @static
+	 * @param  string $method name of the static method being called
+	 * @param  array $arguments array of the passed arguments
+	 * @return mixed converted units or false
+	 */
+	public static function __callStatic($method, $arguments)
+	{
+		$pieces = explode('to', strtolower($method));
+
+		if (count($pieces) == 2)
+		{
+			var_dump($arguments[0], $pieces[0], $pieces[1]);
+			return Distance::convertUnit($arguments[0], $pieces[0], $pieces[1]);
+		}
+
+		return false;
+	}
+
+	// }}}
+	// {{{ Convert Unit
+
+	/**
+	 * Convert Unit
+	 *
+	 * Converts a distance from one unit to another.
+	 *
+	 * @static
+	 * @param  mixed $distance starting distance
+	 * @param  string $from starting unit
+	 * @param  string $to ending unit
+	 * @return mixed
+	 */
+	private static function convertUnit($distance, $from, $to)
+	{
+		$multiplier = 1;
+
+		switch ($from)
+		{
+			case 'kilometers':
+				switch ($to)
+				{
+					case 'miles':  $multiplier = 0.621371; break;
+					case 'meters': $multiplier =     1000; break;
+					case 'yards':  $multiplier =  1093.61; break;
+				}
+				break;
+
+			case 'miles':
+				switch ($to)
+				{
+					case 'kilometers': $multiplier = 1.60934; break;
+					case 'meters':     $multiplier = 1609.34; break;
+					case 'yards':      $multiplier =    1760; break;
+				}
+				break;
+
+			case 'meters':
+				switch ($to)
+				{
+					case 'kilometers': $multiplier =       0.001; break;
+					case 'miles':      $multiplier = 0.000621371; break;
+					case 'yards':      $multiplier =     1.09361; break;
+				}
+				break;
+		}
+
+		return $distance * $multiplier;
+	}
+
+	// }}}
+	// {{{ Calculate Distance
+
+	/**
+	 * Calculate Distance
+	 *
+	 * Calculates the distance between two sets of coordinates and returns the
+	 * requested units. I really wanted to call this distance() but it seems
+	 * you can't do that in PHP due to the backwards compatibility of the
+	 * PHP4 constructors that were named the same as the class.
+	 *
+	 * @static
+	 * @param  mixed $latitude_from starting latitude
+	 * @param  mixed $longitude_from starting longitude
+	 * @param  mixed $latitude_from starting latitude
+	 * @param  mixed $longitude_from starting longitude
+	 * @param  string $unit optional units to return, miles by default
+	 * @return mixed distance between the points in the desired unit
+	 */
+	public static function calculateDistance($latitude_from, $longitude_from, $latitude_to, $latitude_from, $unit = 'miles')
+	{
+		$unit  = ucwords(strtolower($unit));
+		$theta = $lontitude_from - $longitude_to;
+
+		$distance =
+			sin(deg2rad($latitude_from))
+			* sin(deg2rad($latitude_to))
+			+ cos(deg2rad($latitude_from))
+			* cos(deg2rad($latitude_to))
+			* cos(deg2rad($theta));
+
+		$distance = acos($distance);
+		$distance = rad2deg($distance);
+		$miles    = $distance * 60 * 1.1515;
+
+		$method = 'milesTo' . $unit;
+
+		return Distance::$method($miles);
+	}
+
+	// }}}
+}
+
+?>