Solved

Image creation via PHP

Posted on 2003-11-24
11
300 Views
Last Modified: 2010-04-17
Hi, I  have recently been working on a script which will create an image via PHP, but seems to have stumbled upon a big error.

My script is..

<?

if($ploc=="Hev") { $im = imagecreatefrompng('Hev.png'); }
else if($ploc=="Sky") { $im = imagecreatefrompng('Sky.png'); }
else if($ploc=="Sur") { $im = imagecreatefrompng('Sur.png'); }
else if($ploc=="Dun") { $im = imagecreatefrompng('Dun.png'); }
else if($ploc=="Hel") { $im = imagecreatefrompng('Hel.png'); }

      $kdc=0;
      $kds=0;

      ?>
            <script language="JavaScript" type="text/javascript">
                  function loc(x,y) { s_Loc.innerHTML="Location: "+x+","+y; }
                  function ut() { s_Loc.innerHTML="<br>"; }
                  function kd(kdnum) { s_KD.innerHTML=kdnum; }
                  function kds(kdnum) { s_KDS.innerHTML=kdnum; }
            </script>
      <?

      echo "Number of kingdoms: <span id=s_KD>".$kdc."</span> || Kingdoms Checked: <span id=s_KDS>".$kds."</span><p><span id=s_Pic>Old :: <br><img src=result.jpeg></span><p>";

$width=300;
$height=300;

$image=imagecreate($width,$height);
$bg=imagecolorallocate($image, 0x00,0x00,0x00);

for ($i=0;$i<300;$i++){
      for ($j=0;$j<300;$j++){
            $start_x = $j;
            $start_y = $i;
            $color=imagecolorat($im, $start_x, $start_y);
            if($color==$colour) {
                  $kdc++;
                  imagesetpixel($image,$start_x,$start_y,$color);
            }
            $kds++;
      }
      echo "<script>kds(\"".number_format($kds)."\");</script>";
      echo "<script>kd(\"".number_format($kdc)."\");</script>";
}

imagejpeg($image,"result.jpeg");
imagedestroy($image);

echo "<p>New :: <br><img src=result.jpeg>";

?>

The imagesetpixel() seems to not be working at all and therefore it prints a fully black image. This shouldn't happen. Can anyone suggest a fix? (based on the above script). Quickest and most efficient answer gets..... ooooohh.... 75 points?

EDIT: Upped to 100
0
Comment
Question by:Vampireofdarkness
  • 5
  • 4
11 Comments
 
LVL 8

Expert Comment

by:_corey_
ID: 9812916
Where is $colour defined?

Have you verified the color value and the fact that imagesetpixel even gets called?
0
 
LVL 9

Author Comment

by:Vampireofdarkness
ID: 9812935
Oh, sorry.
   $colour is a variable from a previous page (appears in /xx.php?colour=xx)
   $ploc is also the same
0
 
LVL 9

Author Comment

by:Vampireofdarkness
ID: 9812941
and imagesetpixel does get called as it shows that there are 10,144 color matches
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 9

Author Comment

by:Vampireofdarkness
ID: 9813539
Found a solution for myself... now to close this....

Thanks for your help anyway
0
 
LVL 8

Expert Comment

by:_corey_
ID: 9813874
I believe posting on the CS area will get it removed for you.

Was it a bad setting of $colour or something else?
0
 
LVL 9

Author Comment

by:Vampireofdarkness
ID: 9813901
All I needed to do was define $colour before the loop with

$black=imagecolorallocate($image, 0x00,0x00,0x00);

for a black colour, etc..etc.. then use those colours.
0
 
LVL 8

Expert Comment

by:_corey_
ID: 9813935
Ah, so $colour was simply being defined in the loop and constantly matching up with the value of black?
0
 
LVL 9

Author Comment

by:Vampireofdarkness
ID: 9813948
$colour wasn't being defined, for some reason although it should have been. Which is why it posted black.
0
 
LVL 8

Expert Comment

by:_corey_
ID: 9814000
That's what I had suspected when I saw it wasn't defined.  It was being defined with a default nothing value and so then black always matched with it.
0
 
LVL 1

Accepted Solution

by:
Computer101 earned 0 total points
ID: 9831768
PAQed, with points refunded (100)

Computer101
E-E Admin
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Displaying an arrayList in a listView using the default adapter is rarely the best solution. To get full control of your display data, and to be able to refresh it after editing, requires the use of a custom adapter.
If you’re thinking to yourself “That description sounds a lot like two people doing the work that one could accomplish,” you’re not alone.
In this fourth video of the Xpdf series, we discuss and demonstrate the PDFinfo utility, which retrieves the contents of a PDF's Info Dictionary, as well as some other information, including the page count. We show how to isolate the page count in a…
In this fifth video of the Xpdf series, we discuss and demonstrate the PDFdetach utility, which is able to list and, more importantly, extract attachments that are embedded in PDF files. It does this via a command line interface, making it suitable …

773 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question