<?PHP

// --- Convert RAW image airfoil into .DAT file - Caltabiano Salvatore - Frontier2  ---
// --- Convert RAW image airfoil shape into .DAT file                               ---
// --- By Caltabiano Salvatore - Frontier2 - 2006 September 06 - V 1.00 PHP Version ---

class Airfoil{
	var $info;
	var $cols;
	var $rows;
	var $data;
	var $coords;
	var $coordsr;
	var $coordsl;
	var $ratio;
	var $filename;
	var $filenameout;

	function Airfoil()
	{
		$this->info = "Airfoil coords :";
		$this->cols = 0;
		$this->rows = 0;
		$this->ratio = 1;
		$this->data = NULL;
		$this->coords = NULL;
		$this->coordsr = NULL;
		$this->coordsl = NULL;
		$this->filename = "airfoil.raw";
		$this->filenameout = "airfoil.dat";
	}

	function load()
	{
		$fpin = fopen($this->filename, "r+b");
		if ( $fpin )
		{
			$data = "";
			$curdata = "";
			do
			{
				$curdata = fread($fpin,8192);
				$data .= $curdata;
			}while($curdata != "");
			
			fclose($fpin);
		}

		if ( isset($data) ) $this->data = $data;
		// USE THIS CICLE IF RAW FILE IMAGE IS RGB AND NOT GREY SCALE
		//for ( $j=0 ; isset($data[$j]) ; $j += 3 )
		//	$this->data .= $data[$j];


		$filenameout = explode(".",basename($this->filename));
		$filenameout[0] .= ".DAT";
		$this->filenameout = $filenameout[0];

		$info = explode(".",basename($this->filename));
		$this->info = $info[0];
	}

	function calculate()
	{
		if ( !isset($this->data) )
			return FALSE;

		if ( $this->cols == 0 || $this->rows == 0 )
			return FALSE;

		for( $c=$this->cols-1 ; $c>=0 ; $c-- )
		{
			for( $r=0 ; $r<$this->rows-1 ; $r++ )
			{
				if ( ord($this->data[($this->rows*$r+$c)]) == 0 )
				{
					$x = $c;
					$y = (-($r-intval($this->rows/2-1)));
					if ( isset($coords) && $y+1 == $coords['y'])
						$coords = array ( "x" => $x, "y" => $y );
					else
					{
						$coords = array ( "x" => $x, "y" => $y );
						$this->coords[] = $coords;
					}
				}
			}
		}

		return TRUE;
	}

	function sort2()
	{
		if ( !isset($this->coords) )
			return FALSE;

		$coordsr = $this->coords[0];
		$coordsl = $this->coords[0];

		for ( $j=0 ; isset($this->coords[$j]) ; $j++)
		{
			if ( $this->coords[$j]['x'] >= $coordsr['x'] )
				$coordsr = $this->coords[$j];

			if ( $this->coords[$j]['x'] <= $coordsl['x'] )
				$coordsl = $this->coords[$j];

			if ( $j>0 && $this->coords[$j]['x'] == $this->coords[$j-1]['x'] )
				$coordsdown[] = $this->coords[$j];
			else
				$coordsup[] = $this->coords[$j];
		}

		if ( isset($coordsdown) ) $coordsdown = array_reverse($coordsdown);

		$this->coordsr = $coordsr;
		$this->coordsl = $coordsl;

		$this->ratio = (1+($coordsr['x']-$coordsl['x']));

		if ( isset($coordsup) && isset($coordsdown) )
			$this->coords = array_merge($coordsup,$coordsdown);
	}

	function displayCoords($step=5)
	{
		if ( !isset($this->coords) )
			return FALSE;

		echo $this->info."
";

		for ( $j=0 ; isset($this->coords[$j]) ; $j++)
			if ( $j%$step == 0 )
			echo $this->coords[$j]['x']/$this->ratio." ".$this->coords[$j]['y']/$this->ratio."
";
	}

	function displayCoordsRL()
	{
		if ( !isset($this->coords) )
			return FALSE;

		echo "LEFT: [".$this->coordsl['x']/$this->ratio."][".$this->coordsl['y']/$this->ratio."]<BR>\n";
		echo "RIGHT: [".$this->coordsr['x']/$this->ratio."][".$this->coordsr['y']/$this->ratio."]<BR>\n";
	}

	function saveCoords($step=5)
	{
		if ( !isset($this->coords) )
			return FALSE;

		$fpout = fopen("temp/".$this->filenameout, "w+t");
		{
			fwrite($fpout,$this->info."
");
			for ( $j=0 ; isset($this->coords[$j]) ; $j++)
			{
				if ( $j%$step == 0 ){
					fwrite($fpout,$this->coords[$j]['x']/$this->ratio." ".$this->coords[$j]['y']/$this->ratio);
				if ( isset($this->coords[$j+1]) )
					fwrite($fpout,"
");
				}
			}
			fclose($fpout);
		}
	}

}

?>