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