GD Graph Help

[herghost]

Hi all,

 

I am trying to create a graph from some variables, here is my code:

<?php
header("Content-type:image/png");
include('serverauth.php');

$query = "https://" . $ip . ":2087/json-api/loadavg";



$curl = curl_init();	
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST,0);		
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER,0);		
curl_setopt($curl, CURLOPT_RETURNTRANSFER,1);		
$header[0] = "Authorization: WHM $whmusername:" . preg_replace("'(\r|\n)'","",$whmhash);	
curl_setopt($curl,CURLOPT_HTTPHEADER,$header);		
curl_setopt($curl, CURLOPT_URL, $query);			
$result = curl_exec($curl);							
if ($result == false) {
error_log("curl_exec threw error \"" . curl_error($curl) . "\" for $query");
}
curl_close($curl);

$var = $result;

$one = $var[8] . $var[9] . $var[10] . $var[11];
$five = $var[22] . $var[23] . $var[24] . $var[25];
$fifteen =  $var[39] . $var[40] . $var[41] . $var[42];
?>

<?php

// read the post data
        $data = array($one,$five,$fifteen);
        $sum = array_sum($data);
        
        $height = 255;
        $width = 320;
        
        $im = imagecreate($width,$height); // width , height px

        $white = imagecolorallocate($im,255,255,255); 
        $black = imagecolorallocate($im,0,0,0);   
        $red = imagecolorallocate($im,255,0,0);   


        imageline($im, 10, 5, 10, 230, $black);
        imageline($im, 10, 230, 300, 230, $black);
    

        $x = 15;   
        $y = 230;   
        $x_width = 20;  
        $y_ht = 0; 
       
        for ($i=0;$i<7;$i++){
        
          $y_ht = ($data[$i]/$sum)* $height;    
          
              imagerectangle($im,$x,$y,$x+$x_width,($y-$y_ht),$red);
              imagestring( $im,2,$x-1,$y+10,$data[$i],$black);
              
          $x += ($x_width+20);  
         
        }
        
        imagejpeg($im);

?>

 

however I am just getting an missing image x where the graph should appear?

 

Any ideas? The GD library is installed so that shouldn't be a problem!

 

Thanks

 

[cags]

You are sending a Content-Type header to say the image is a png, but you are saving it with imagejpeg, this may not be causing your problem but it certainly won't help. Trying using imagepng instead. Another thing that would cause problems is if you have display_errors and error_reporting set. If an error occurs the error message will appear in the image. Try saving the image to file, opening it with a text editor and look for an error message at the start of the file.

[herghost]

Hi Cags,

 

Thanks sorted that but still have a problem, it should now be saving to file but I get this message:

Unable to open 'http://localhost/jolly/office/serverfuctions/graphs/chart1.png' for writing: Invalid argument in C:\wamp\www\jolly\office\serverfuctions\avload.php on line 96

 

There is no error in the .png file and its chmod 777?

 

Cheers

 

[herghost]

Here is the code for avload:

 

<?php

include('serverauth.php');

$query = "https://" . $ip . ":2087/json-api/loadavg";



$curl = curl_init();	
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST,0);		
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER,0);		
curl_setopt($curl, CURLOPT_RETURNTRANSFER,1);		
$header[0] = "Authorization: WHM $whmusername:" . preg_replace("'(\r|\n)'","",$whmhash);	
curl_setopt($curl,CURLOPT_HTTPHEADER,$header);		
curl_setopt($curl, CURLOPT_URL, $query);			
$result = curl_exec($curl);							
if ($result == false) {
error_log("curl_exec threw error \"" . curl_error($curl) . "\" for $query");
}
curl_close($curl);

$var = $result;

$one = $var[8] . $var[9] . $var[10] . $var[11];
$five = $var[22] . $var[23] . $var[24] . $var[25];
$fifteen =  $var[39] . $var[40] . $var[41] . $var[42];
?>

<?php

// read the post data
        //$values = array($one,$five,$fifteen);
        $values = array("jan" =>1,
					"feb" =>2
					);
        
       	$img_width=450;
$img_height=300; 
$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=20;
$total_bars=count($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);
$ratio= $graph_height/$max_value;


# -------- Create scale and draw horizontal lines  --------
$horizontal_lines=20;
$horizontal_gap=$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,$x1+3,$y1-10,$value,$bar_color);
	imagestring($img,0,$x1+3,$img_height-15,$key,$bar_color);		
	imagefilledrectangle($img,$x1,$y1,$x2,$y2,$bar_color);
}

$temp_chart_file_name = "graphs/chart1.png"; imagepng($img, $temp_chart_file_name,0);

?>