** Using WeBWorK **

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http://webhost.math.rochester.edu/webworkdocs/docs/pglanguage/pod/wwplot#methods_and_properties

size

($horizontal_pixels, $vertical_pixels) = $graph ->size();
Reads the size of the graph image in pixels. This cannot be reset.
It is defined by the new constructor and cannot be changed.

[ Later: Oops. I just looked at the code and $graph->size() returns a pointer to an array, not an array, so the code above should be

($horizontal_pixels, $vertical_pixels) = @{$graph ->size()};

WWPlot is build on the GD.pm module and our link seems to be broken at the moment, but a quick google search shows documentation at http://supportweb.cs.bham.ac.uk/documentation/perl-modules/GD.html. I didn't see a size method there.

It will clarify matters if you tell us how the object $pic was created.

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$pt = [34, 56];
@val= $pt;   # this is where you used $pic->size();
print $val[0];    # gives ARRAY(0x801180)
print $val[0][0];  # gives 34
print $val[0][1];  # gives 56
print $val[1];      # gives an undefined value.

I'm pretty sure that you ended up defining a one element array. The element was
a pointer to an array pair. In perl $val[0][0] is equivalent to $val[0]->[0]. All of the indices
AFTER the first one can be thought of as being preceeded by arrows.

Hope this helps.

Take care,

Mike

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