Transparent color

[CHAN, KENNETH 1 [AG/7721]]

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.

 

Regards,

Kenneth

 

 

############## Code #######################

print "Content-type: text/plain; charset-iso-8859-1\n\n";

 

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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