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58 lines
868 B
58 lines
868 B
package
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Turtle;
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# Written by jreed@itis.com, adapted by Cristy.
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sub new
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{
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my $class = shift;
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my $self = {};
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@{$self}{qw(x y theta mirror)} = @_;
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bless $self, $class;
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}
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sub forward
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{
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my $self = shift;
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my ($r, $what) = @_;
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my ($newx, $newy)=($self->{x}+$r* sin($self->{theta}),
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$self->{y}+$r*-cos($self->{theta}));
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if ($what) {
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&$what($self->{x}, $self->{y}, $newx, $newy); # motion
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}
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# According to the coderef passed in
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($self->{x}, $self->{y})=($newx, $newy); # change the old coords
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}
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sub turn
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{
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my $self = shift;
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my $dtheta = shift;
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$self->{theta} += $dtheta*$self->{mirror};
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}
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sub state
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{
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my $self = shift;
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@{$self}{qw(x y theta mirror)};
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}
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sub setstate
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{
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my $self = shift;
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@{$self}{qw(x y theta mirror)} = @_;
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}
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sub mirror
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{
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my $self = shift;
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$self->{mirror} *= -1;
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}
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"Turtle.pm";
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