how can you put this?

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

Hi!
In the GD::Graph module, how can I put an array of colours in the dclrs attribute?
I mean, instead of saying:

$graph->set(
'dclrs' => [ qw(lblue lyellow blue yellow lgreen lred
green red purple orange pink dyellow) ]
[download]

if I have an array, like:

@colour_array = ("lblue", "lyellow", "blue", "yellow", "lgreen", "lred
+", "green", "red", "purple", "orange", "pink", "dyellow");
[download]

can I pass it inside?

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Re: how can you put this? by tobyink (Canon) on Jun 27, 2013 at 18:21 UTC
`$graph->set(dclrs => \@colour_array)` [download] or: `$graph->set(dclrs => [@colour_array])` [download] There's a slight difference between the two; the first gives `$graph` a reference to your original array, so `$graph` could theoretically modify it (push elements onto it, for example). The second creates an empty array, copies from your original array into the new one, and gives `$graph` a reference to the new array. That way your original array is safe from any modification. Which one you choose depends on whether you want to allow `$graph` to be able to modify `@colour_array` at all. If you don't care whether it does, then use the first as it will be very marginally faster. `package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name`	[reply] [d/l] [select]
Re: how can you put this? by Eily (Monsignor) on Jun 27, 2013 at 18:22 UTC
Sure. What the first bit of code does is use an (anonymous) array ref. What you want to do is use a reference to your array. `$graph->set( dclrs => \@colour_array );` Upgrade : Oh well, just go along with tobyink's answer, since it's more complete.	[reply] [d/l]