Added distance calculation for past trips. It is really something tha…

…t should be returned from the API, but this gets the hard work done. The calculation for total distance is very hack-ish.

includes/class.geocalculator.php

@@ -0,0 +1,95 @@
+<?php
+/**
+ * GeoCalculator
+ */
+class GeoCalculator {
+
+	static $earth_radius = 3960.00; // Measured in miles
+	static $GoogleMapsAPIKey = ''; // If you need to register your requests
+
+	/**
+	 * Get Geo Distance
+	 *
+	 * @param string $lat1 
+	 * @param string $lon1 
+	 * @param string $lat2 
+	 * @param string $lon2 
+	 * @return int
+	 */
+	public function getGeoDistance($lat1=0, $lon1=0, $lat2=0, $lon2=0) {
+
+		// If either set is not set, distance is automatically zero.
+		if ( (!$lat1 && !$lon1) || (!$lat2 && !$lon2) )
+			return 0;
+
+		return self::_distance_haversine($lat1, $lon1, $lat2, $lon2);
+	}
+
+	/**
+	 * Geocode an Address
+	 *
+	 * @param string $address
+	 */
+	public function geocodeAddress($address) {
+
+		if (!$address)
+			return false;
+
+		$api_key = self::$GoogleMapsAPIKey;
+		$address = urlencode($address);
+		$url = sprintf("http://maps.google.com/maps/geo?q=%s&key=%s&output=json", $address, $api_key);
+
+		/* cURL request */
+		$ch = curl_init($url);
+		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+		$data = curl_exec($ch);
+
+		if (!$data)
+			return false;
+
+		// Decode the JSON response
+		$json = json_decode($data);
+
+		if(!isset($json->Status->code) || $json->Status->code != "200")
+			return false;
+
+		// Parse coordinates into latitude and logitude
+		return ($json->Placemark[0]->Point->coordinates);
+
+	}
+
+	/* Private Methods */
+
+	/**
+	 * Constructor
+	 */
+	private function __construct() {
+		// Not an instatiated object.
+	}
+
+	/**
+	 * Haversine Distance Calculation
+	 *
+	 * @param string $lat1 
+	 * @param string $lon1 
+	 * @param string $lat2 
+	 * @param string $lon2 
+	 * @return int
+	 */
+	private function _distance_haversine($lat1, $lon1, $lat2, $lon2) {
+
+		// Calculate Deltas
+		$delta_lat = $lat2 - $lat1 ;
+		$delta_lon = $lon2 - $lon1 ;
+
+	  $alpha    = $delta_lat/2;
+	  $beta     = $delta_lon/2;
+	  $a        = sin(deg2rad($alpha)) * sin(deg2rad($alpha)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * sin(deg2rad($beta)) * sin(deg2rad($beta)) ;
+	  $c        = asin(min(1, sqrt($a)));
+	  $distance = 2*self::$earth_radius * $c;
+	  $distance = round($distance, 4);
+
+	  return (float) $distance;
+	}
+
+}

includes/master.inc.php

@@ -8,6 +8,7 @@
 require 'class.tripit.php';
 require 'class.smarty.php';
 require 'class.swift.php';
+require 'class.geocalculator.php';
 
 // Globals
 session_start();
@@ -35,8 +36,8 @@
 	$TripIt = new TripItShare( $token );
 
 	// Profile
-	$profile = $TripIt->GetProfile();
-	$Smarty->assign('profile', $profile->Profile);
+	$Profile = $TripIt->GetProfile();
+	$Smarty->assign('profile', $Profile->Profile);
 
 else:
 	// Don't process redirect if already on OAuth page

index.php

@@ -6,13 +6,40 @@
 if (!$TripIt)
 	header('Location: oauth.php');
 
+// Total Distance Traveled
+$total_distance = 0;
+
 // Past Trips
 $past_trips = $TripIt->GetTrips( array('past' => 'true') );
 if (isset($past_trips->Trip->display_name)) // if single trip
 	$Smarty->assign('past_trips', array($past_trips->Trip));
 else
 	$Smarty->assign('past_trips', $past_trips->Trip );
 
+/*
+	Calculating a Simple Distance between 'home' and
+	the primary location of the trip. Proof of concept.
+*/
+$track_miles = true;
+$home_city = $Profile->Profile->home_city;
+if (!$home_city)
+	$track_miles = false; // Can't calculate without city/state
+
+if ($track_miles):
+	$home_city_geo = GeoCalculator::geocodeAddress($home_city);
+	foreach ($past_trips->Trip as $key => $trip):
+		$lat1 = $trip->PrimaryLocationAddress->latitude;
+		$lon1 = $trip->PrimaryLocationAddress->longitude;
+		$distance = GeoCalculator::getGeoDistance($lat1, $lon1, $home_city_geo[0], $home_city_geo[1]);
+		$past_trips->Trip[$key]->distance_traveled = $distance;
+		$total_distance += ($distance * 2);
+	endforeach;
+	$Smarty->assign('miles_traveled', $total_distance);
+else:
+	$Smarty->assign('miles_traveled', 0);
+endif;
+$Smarty->assign('track_miles', (bool) $track_miles);
+
 // Future Trips
 $future_trips = $TripIt->GetTrips( array('past' => 'false') );
 if (isset($future_trips->Trip->display_name)) // if single trip

templates/main.tpl

@@ -47,13 +47,17 @@
 
 
 <h2>Past Trips</h2>
+<p><strong>Estimated Miles Traveled:</strong> {$miles_traveled|number_format} [<a href="javascript:void(0)" onclick="javascript:alert('Calculated between your home city and primary destination, multipled by two to get to/from distance.')">?</a>]</p>
 <table>
 	<thead>
 		<tr>
 			<th>Trip</th>
 			<th>City</th>
 			<th>Start Date</th>
 			<th>End Date</th>
+			{if $track_miles eq true}
+			<th>Distance (miles)</th>
+			{/if}
 		</tr>
 	</thead>
 	<tbody>
@@ -63,6 +67,9 @@
 			<td class="primary-location">{$trip->primary_location}</td>
 			<td class="start-date">{$trip->start_date|date_format}</td>
 			<td class="end-date">{$trip->end_date|date_format}</td>
+			{if $track_miles eq true}
+			<td>{$trip->distance_traveled|number_format}</td>
+			{/if}
 		</tr>
 	{/foreach}
 	{if $past_trips|count eq 0}