DOCUMENT();

loadMacros(
	'PGstandard.pl',
	'MathObjects.pl',
	'PGML.pl',
	'parserGraphTool.pl',
	'PGcourse.pl'
);

$gt = GraphTool()->with(
	bBox => [-20, 20, 20, -20],
	ticksDistanceX => 4, ticksDistanceY => 4,
	minorTicksX => 3, minorTicksY => 3,
	ariaDescription => 'Graph a parabola that represents an odd function.',
	cmpOptions => { list_checker => sub { return 0; } }
);

my $cmp = $gt->cmp->withPreFilter('erase')->withPostFilter(sub {
	my $ans = shift;
	$ans->{score} = 1 if $ans->{student_value} eq '';
	return $ans;
});

BEGIN_PGML
Graph a parabola that represents an odd function.  If that is impossible, then leave the graph blank.

[@ $gt->ans_rule @]*
END_PGML

LABELED_ANS($gt->ANS_NAME, $cmp);

ENDDOCUMENT();