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Derick Rethans
52 lines
1.7 KiB
XML
52 lines
1.7 KiB
XML
<slide>
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<title>Finding Food</title>
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<subtitle>Getting The Data: SQLite</subtitle>
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<div effect="fade-out">
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<example><![CDATA[<?php
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include 'distance.php';
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header('Content-type: text/plain');
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require '/home/derick/dev/zetacomponents/trunk/Base/src/ezc_bootstrap.php';
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$d = ezcDbFactory::create( 'sqlite://' . dirname( __FILE__ ) . '/pois.sqlite' );
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$wantedD = isset($_GET['d']) ? $_GET['d']: 1;
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$q = $d->createSelectQuery();
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$q->select('*')->from('poi');
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if ( $_GET['cuisine'] !== 'all' )
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{
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$q->where($q->expr->eq('cuisine', $q->bindValue( $_GET['cuisine'] ) ) );
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}
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$s = $q->prepare();
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$s->execute();
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echo "lat\tlon\ttitle\tdescription\ticonSize\ticonOffset\ticon\r\n";
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foreach( $s as $res) {
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$e = distance2($_GET['lat'], $_GET['lon'], $res['lat'], $res['lon'] );
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if ($e < $wantedD) {
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echo $res['lat'], "\t", $res['lon'], "\t", $res['name'], "\t", sprintf('%.2f', $e). " km away\t16,16\t-8,-8\tpub.png\r\n";
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}
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}]]></example>
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<blurb><link href='/presentations/slides/map/examples/fetch.php?cuisine=all&lat=51.514&lon=-0.116&d=0.5'/></blurb>
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</div>
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<div effect="fade-in-out">
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<blurb>Calculating Distance</blurb>
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<example><![CDATA[<?php
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function distance2($latA, $lonA, $latB, $lonB)
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{
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$latA = deg2rad($latA);
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$lonA = deg2rad($lonA);
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$latB = deg2rad($latB);
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$lonB = deg2rad($lonB);
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$deltaLat = ($latA - $latB);
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$deltaLon = ($lonA - $lonB);
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$d = sin($deltaLat/2) * sin($deltaLat/2) +
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cos($latA) * cos($latB) * sin($deltaLon/2) * sin($deltaLon/2);
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$d = 2 * asin(sqrt($d));
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return $d * 6371.01;
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}
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]]></example>
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<div><blurb>See also: <link href='http://drck.me/spat-osm-sqlite-8la'/></blurb></div>
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</div>
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</slide>
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