table = $table;
$this->connection = &$connection;
$this->sensId = $sensId;
$this->_fetchWindData();
}
/* Funktion, die die Klasse mit den Weten initialisiert */
function _fetchWindData(){
/* Aktuelle Wind bestimmen */
$nowQuery = "SELECT geschw as wind, richt as dir, to_char(timestamp, 'DD.MM.YYYY HH24:MI') as text_timestamp FROM ".$this->table." WHERE sens_id=".$this->sensId." ORDER BY timestamp DESC LIMIT 1";
$nowData = $this->connection->fetchQueryResultLine($nowQuery);
/* Max und Min-Werte bestimmen */
$maxQuery = "SELECT geschw as wind, richt as dir, to_char(timestamp, 'DD.MM.YYYY HH24:MI') as text_timestamp FROM ".$this->table." WHERE sens_id=".$this->sensId." AND geschw=(SELECT max(geschw) FROM ".$this->table." WHERE sens_id=".$this->sensId.") ORDER BY timestamp DESC LIMIT 1";
$maxData = $this->connection->fetchQueryResultLine($maxQuery);
/* Bestimmte Werte den Klassenvariablen zuordnen */
$this->nowWind = $nowData['wind'];
$this->nowDir = $this->_calcDirection($nowData['dir']);
$this->nowDate = $nowData['text_timestamp'];
$this->maxWind = $maxData['wind'];
$this->maxDir = $this->_calcDirection($maxData['dir']);
$this->maxDate = $maxData['text_timestamp'];
}
function _calcDirection($deg){
$part = 11.25;
$val = floor($deg/$part);
$i = 0;
if($val == ++$i || $val == ++$i)
return "N-N-O";
elseif($val == ++$i || $val == ++$i)
return "N-O";
elseif($val == ++$i || $val == ++$i)
return "O-N-O";
elseif($val == ++$i || $val == ++$i)
return "O";
elseif($val == ++$i || $val == ++$i)
return "O-S-O";
elseif($val == ++$i || $val == ++$i)
return "S-O";
elseif($val == ++$i || $val == ++$i)
return "S-S-O";
elseif($val == ++$i || $val == ++$i)
return "S";
elseif($val == ++$i || $val == ++$i)
return "S-S-W";
elseif($val == ++$i || $val == ++$i)
return "S-W";
elseif($val == ++$i || $val == ++$i)
return "W-S-W";
elseif($val == ++$i || $val == ++$i)
return "W";
elseif($val == ++$i || $val == ++$i)
return "W-N-W";
elseif($val == ++$i || $val == ++$i)
return "N-W";
elseif($val == ++$i || $val == ++$i)
return "N-N-W";
else
return "N";
}
function _genFullDirection($shortDir){
switch ($shortDir){
case "N":
return "Nord";
case "N-N-O":
return "Nord-Nord-Ost";
case "N-O":
return "Nord-Ost";
case "O-N-O":
return "Ost-Nord-Ost";
case "O":
return "Ost";
case "O-S-O":
return "Ost-Süd-Ost";
case "S-O":
return "Süd-Ost";
case "S-S-O":
return "Süd-Süd-Ost";
case "S":
return "Süd";
case "S-S-W":
return "Süd-Süd-West";
case "S-W":
return "Süd-West";
case "W-S-W":
return "West-Süd-West";
case "W":
return "West";
case "W-N-W":
return "West-Nord-West";
case "N-W":
return "Nord-West";
case "N-N-W":
return "Nord-Nord-West";
}
}
/* liefert den Durchschnittswert in einem bestimmtem Interval */
function _getAverage($interval){
$avQuery = "SELECT avg(geschw) as average, count(geschw) as count FROM ".$this->table." WHERE sens_id=".$this->sensId." AND timestamp>(select (current_timestamp - INTERVAL '".$interval."'))";
$avData = $this->connection->fetchQueryResultLine($avQuery);
return $avData;
}
/* momentanen Durchschnittswert bestimmen */
function _fetchAverage(){
$avData = array('average'=>0, 'count'=>0); /* Array initialisieren */
$i = 1; /* Laufvariable */
while($avData['count']<5){ /* Schleife prueft, in welchem Interval 5 Werte zusammenkommen */
$i++; /* Laufvariable erhoehen */
$avData = $this->_getAverage(($i*(Config::getAvInterval()))." minutes"); /* Holt Werte mit gegebenem Interval */
}
/* Werte den Klassenvariablen zuordnen */
$this->avVal = $avData['average'];
$this->avInter = $i*(Config::getAvInterval());
}
/* Bestimmt die Tendenz */
function _fetchMoving(){
$shortAvData = $this->_getAverage("15 minutes"); /* Durchschnitt der letzten 15 minuten */
$longAvData = $this->_getAverage("120 minutes"); /* Durchschnitt der letzten 120 Minuten */
if($shortAvData['count'] < 1 || $longAvData['count'] < 2){ /* Wenn in den letzten 5 minuten kein Wert kam oder in den letzten 120 min weniger als 3 Werte kamen */
$this->changing = "Berechnung momentan nicht moeglich"; /* Dann ausgeben, dass momentan nichts berechnet werden kann */
return; /* und aus der Funktion huepfen */
}
$changing = $shortAvData['average'] - $longAvData['average']; /* Aenderung berechnen */
if($changing > 0){ /* Wenn Aenderung positiv */
$this->changing = "steigend (+ ".abs(round($changing * 0.1, 1))." km/h)"; /* dann steigende Tendenz ausgeben */
} elseif($changing < 0) { /* wenn Negativ */
$this->changing = "fallend (- ".abs(round($changing * 0.1, 1))." km/h)"; /* Fallende Tendenz ausgeben */
} else { /* an sonsten */
$this->changing = "gleichbleibend (± 0 km/h)"; /* sagen, das es gleich geblieben ist */
}
return;
}
/* --- Funktionen, die aufgerufen werden um die geholeten Werte auszugeben --- */
function get_now_val(){
return round($this->nowWind * 0.1, 1);
}
function get_now_dir(){
return $this->nowDir;
}
function get_now_dir_full(){
return $this->_genFullDirection($this->nowDir);
}
function get_now_date(){
return $this->nowDate;
}
function get_av_value(){
if($this->avVal == "nc")
$this->_fetchAverage();
return round($this->avVal * 0.1, 1);
}
function get_av_interval(){
if($this->avInter == "nc")
$this->_fetchAverage();
return $this->avInter;
}
function get_changing(){
if($this->changing == "nc")
$this->_fetchMoving();
return $this->changing;
}
function get_max_val(){
return round($this->maxWind * 0.1, 1);
}
function get_max_dir(){
return $this->maxDir;
}
function get_max_dir_full(){
return $this->_genFullDirection($this->maxDir);
}
function get_max_date(){
return $this->maxDate;
}
}
?>