Schotten Tank Niveaumessung

PHP

/var/www/html/graph.php

<?php
$tankinhalt=24;  // in m3
# File usläsä

$file1 = "data.txt";
$lines = file($file1);
//$valuesold=array('0' => 0);
foreach($lines as $line_num => $line)
{
        $linesep = explode(',', $line);
        $date=gmdate("H", $linesep[0]);
        $linesepcalc= $linesep[1] / 1000;
//      echo $date;
        $values[$date] = $linesepcalc;
//      echo '<b>Messzeit:</b> '.gmdate("Y.m.d H:i:s ", $linesep[0]);
//      echo "<br>";
}

//      print_r($values);


# ------- The graph values in the form of associative array
//$values=array(
//    "Jan" => 110,
//    "Feb" => 130,
//    "Dec" => 196
//);


$img_width=800;
$img_height=400;
$margins=20;


# ---- Find the size of graph by substracting the size of borders
$graph_width=$img_width - $margins * 2;
$graph_height=$img_height - $margins * 2;
$img=imagecreate($img_width,$img_height);


$bar_width=8;
$total_bars=count($values);
$gap= ($graph_width- $total_bars * $bar_width ) / ($total_bars +1);


# -------  Define Colors ----------------
$bar_color=imagecolorallocate($img,0,64,128);
$background_color=imagecolorallocate($img,240,240,255);
$border_color=imagecolorallocate($img,200,200,200);
$line_color=imagecolorallocate($img,220,220,220);

# ------ Create the border around the graph ------

imagefilledrectangle($img,1,1,$img_width-2,$img_height-2,$border_color);
imagefilledrectangle($img,$margins,$margins,$img_width-1-$margins,$img_height-1-$margins,$background_color);



# ------- Max value is required to adjust the scale -------
//$max_value=max($values);
$max_value=$tankinhalt; // ersetzt mit $tankinhalt

$ratio= $graph_height/$max_value;


# -------- Create scale and draw horizontal lines  --------
$horizontal_lines=$tankinhalt; // 20 ersetzt $tankinhalt
$horizontal_gap=$graph_height/$horizontal_lines;

for($i=1;$i<=$horizontal_lines;$i++){
    $y=$img_height - $margins - $horizontal_gap * $i ;
    imageline($img,$margins,$y,$img_width-$margins,$y,$line_color);
    $v=intval($horizontal_gap * $i /$ratio);
    imagestring($img,0,5,$y-5,$v,$bar_color);

}


# ----------- Draw the bars here ------
for($i=0;$i< $total_bars; $i++){
    # ------ Extract key and value pair from the current pointer position
    list($key,$value)=each($values);
    $x1= $margins + $gap + $i * ($gap+$bar_width) ;
    $x2= $x1 + $bar_width;
    $y1=$margins +$graph_height- intval($value * $ratio) ;
    $y2=$img_height-$margins;
    imagestring($img,0,$x1-8,$y1-10,$value,$bar_color);
    imagestring($img,0,$x1+0,$img_height-15,$key,$bar_color);
    imagefilledrectangle($img,$x1,$y1,$x2,$y2,$bar_color);
}
header("Content-type:image/png");
imagepng($img);

?>