On Thursday 22 Apr 2010 12:12:34 CHAN, KENNETH 1 [AG/7721] wrote:
> Hi all,
>
> I used colorAllocateAlpha to specify a transparent color. After
> filling a circle with it, I don't see the background line which is drawn
> before. The code is pasted below. What did I do wrong here? Thanks.
I think the Alpha color was drawn above the line, as the canvas of GD is not
multi-layered. Otherwise, here are some comments on your code:
>
>
>
> Regards,
>
> Kenneth
>
>
>
>
>
> ############## Code #######################
>
> print "Content-type: text/plain; charset-iso-8859-1\n\n";
>
Please add "use strict;" and "use warnings;" and correct all the problems.
Also use CGI.pm or something like that. You also probably want to print a head
with an "image/png" (IIRC) content-type instead of "text/plain".
Otherwise, looks fine.
Regards,
Shlomi Fish
>
>
> use GD;
>
> my $img = new GD::Image(100,100);
>
>
>
> $black = $img->colorAllocateAlpha(0,0,0,0);
>
> $blue = $img->colorAllocateAlpha(0,0,255,0);
>
> $redTrans = $img->colorAllocateAlpha(255,0,0,100);
>
>
>
> $img->rectangle(0,0,99,99,$black);
>
> $img->fill(50,50,$blue);
>
> $img->line(0,0,100,100,$black);
>
> # draw a transparent circle
>
> $img->filledArc(50,50,50,50,0,360, $redTrans);
>
>
>
> binmode STDOUT;
>
> print $img->png;
>
>
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