GDGraph Installation

Lhamo_rin has asked for the wisdom of the Perl Monks concerning the following question:

Monks,

I have installed GD and GD::Graph along with the required zlib and libpng. When running a simple script I get the following error:

Can't locate object method "png" via package "GD:;Image" at ./gd_test2.pl line 33.

Can someone explain why I might get this message?


use GD;

    # create a new image
    $im = new GD::Image(100,100);

    # allocate some colors
    $white = $im->colorAllocate(255,255,255);
    $black = $im->colorAllocate(0,0,0);       
    $red = $im->colorAllocate(255,0,0);      
    $blue = $im->colorAllocate(0,0,255);

    # make the background transparent and interlaced
    $im->transparent($white);
    $im->interlaced('true');

    # Put a black frame around the picture
    $im->rectangle(0,0,99,99,$black);

    # Draw a blue oval
    $im->arc(50,50,95,75,0,360,$blue);

    # And fill it with red
    $im->fill(50,50,$red);

    # make sure we are writing to a binary stream
    binmode STDOUT;

    # Convert the image to PNG and print it on standard output
    print $im->png;
[download]

Comment on GDGraph Installation Download Code

Replies are listed 'Best First'.
Re: GDGraph Installation by Tanktalus (Canon) on Aug 30, 2005 at 17:46 UTC
`$ perl -we 'print $im->png' Name "main::im" used only once: possible typo at -e line 1. Can't call method "png" on an undefined value at -e line 1.` [download] I think I need a bit more code to replicate the same problem as you're having. ;-)	[reply] [d/l]
Re: GDGraph Installation by Fang (Pilgrim) on Aug 30, 2005 at 17:48 UTC
Paste the whole code instead of only the line causing trouble. When you installed GD, did it correctly detect libpng? Did it tell you explicitely that PNG support was enabled? Update (after Lhamo_rin posted the full code): this is the example code from the GD doc, it works perfectly on my system, so I guess your issue has to do with how you installed all the needed libs. As johnnywang suggested, now that libpng is installed, recompile libgd, then reinstall GD.	[reply]
Re: GDGraph Installation by johnnywang (Priest) on Aug 30, 2005 at 18:01 UTC
The code itself runs ok on my system. I'm thinking may be you need to install libpng before libgd and GD module? I did them in that order, didn't need to do any special configuration or flags.	[reply]


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