<?php
include ("/usr/local/jpgraph/jpgraph.php");
include ("/usr/local/jpgraph/jpgraph_log.php");
include ("/usr/local/jpgraph/jpgraph_line.php");

$y  = array();
$x = array();

$fy = file("fft.dat");	// FFTデータファイル
$f = 1/3600;			// サンプリング周波数

for($i=0;$i<(count($fy)/2);$i++){
	$y[$i]=trim($fy[$i]);
	if($i==0){$x[0]=$f/count($fy);$y[0]=trim($fy[1]);}
	else {$x[$i]=$f*$i/count($fy);}
}

// Create the graph.
$graph = new Graph(550,350,"auto");
$graph->SetScale('loglog');
$graph->SetBox();
$graph->SetMarginColor('white');
$graph->SetFrame(false);

$graph->img->SetMargin(60,10,30,50);     
$graph->title->Set("FFT of the Temperature");       
$graph->xaxis->title->Set("Frequency[Hz]");  
$graph->yaxis->title->Set("PS[a.u.]");     

$graph->title->SetFont(FF_FONT1,FS_BOLD);       
$graph->xaxis->title->SetFont(FF_FONT1,FS_BOLD);
$graph->yaxis->title->SetFont(FF_FONT1,FS_BOLD); 
$graph->xgrid->Show(true,true);
$graph->ygrid->Show(true,true);
$graph->xaxis->SetTitleMargin(10);
$graph->yaxis->SetTitleMargin(40);

$graph->yaxis->SetPos("min");
$graph->xaxis->SetPos("min");

$lineplot=new LinePlot($y,$x);       
$lineplot->SetColor("darkgreen");

// Add plots to the graph
$graph->Add($lineplot);


// Display the graph
$graph->Stroke();

?>