diff options
Diffstat (limited to 'Master/tlpkg/tlperl/lib/GD/Polygon.pm')
-rwxr-xr-x | Master/tlpkg/tlperl/lib/GD/Polygon.pm | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl/lib/GD/Polygon.pm b/Master/tlpkg/tlperl/lib/GD/Polygon.pm new file mode 100755 index 00000000000..42319b266fe --- /dev/null +++ b/Master/tlpkg/tlperl/lib/GD/Polygon.pm @@ -0,0 +1,183 @@ +package GD::Polygon; + +use strict; +use Carp 'carp'; +use GD; + +# old documentation error +*GD::Polygon::delete = \&deletePt; + +=head1 NAME + +GD::Polygon - Polygon class for the GD image library + +=head1 SYNOPSIS + +See L<GD> + +=head1 DESCRIPTION + +See L<GD> + +=head1 AUTHOR + +The GD.pm interface is copyright 1995-2005, Lincoln D. Stein. It is +distributed under the same terms as Perl itself. See the "Artistic +License" in the Perl source code distribution for licensing terms. + +The latest versions of GD.pm are available on CPAN: + + http://www.cpan.org + +=head1 SEE ALSO + +L<GD> +L<GD::Polyline>, +L<GD::SVG>, +L<GD::Simple>, +L<Image::Magick> + +=cut + +### The polygon object ### +# create a new polygon +sub new { + my $class = shift; + return bless { 'length'=>0,'points'=>[] },$class; +} + +# automatic destruction of the polygon +sub DESTROY { + my $self = shift; + undef $self->{'points'}; +} + +sub clear { + my $self = shift; + $self->{'points'} = []; +} + +# add an x,y vertex to the polygon +sub addPt { + my($self,$x,$y) = @_; + push(@{$self->{'points'}},[$x,$y]); + $self->{'length'}++; +} + +# get a vertex +sub getPt { + my($self,$index) = @_; + return () unless ($index>=0) && ($index<$self->{'length'}); + return @{$self->{'points'}->[$index]}; +} + +# change the value of a vertex +sub setPt { + my($self,$index,$x,$y) = @_; + unless (($index>=0) && ($index<$self->{'length'})) { + carp "Attempt to set an undefined polygon vertex"; + return undef; + } + @{$self->{'points'}->[$index]} = ($x,$y); + 1; +} + +# return the total number of vertices +sub length { + my $self = shift; + return $self->{'length'}; +} + +# return the array of vertices. +# each vertex is an two-member (x,y) array +sub vertices { + my $self = shift; + return @{$self->{'points'}}; +} + +# return the bounding box of the polygon +# (smallest rectangle that contains it) +sub bounds { + my $self = shift; + my($top,$bottom,$left,$right) = @_; + $top = 99999999; + $bottom =-99999999; + $left = 99999999; + $right = -99999999; + my $v; + foreach $v ($self->vertices) { + $left = $v->[0] if $left > $v->[0]; + $right = $v->[0] if $right < $v->[0]; + $top = $v->[1] if $top > $v->[1]; + $bottom = $v->[1] if $bottom < $v->[1]; + } + return ($left,$top,$right,$bottom); +} + +# delete a vertex, returning it, just for fun +sub deletePt { + my($self,$index) = @_; + unless (($index>=0) && ($index<@{$self->{'points'}})) { + carp "Attempt to delete an undefined polygon vertex"; + return undef; + } + my($vertex) = splice(@{$self->{'points'}},$index,1); + $self->{'length'}--; + return @$vertex; + } + +# translate the polygon in space by deltaX and deltaY +sub offset { + my($self,$dh,$dv) = @_; + my $size = $self->length; + my($i); + for ($i=0;$i<$size;$i++) { + my($x,$y)=$self->getPt($i); + $self->setPt($i,$x+$dh,$y+$dv); + } +} + +# map the polygon from sourceRect to destRect, +# translating and resizing it if necessary +sub map { + my($self,$srcL,$srcT,$srcR,$srcB,$destL,$destT,$destR,$destB) = @_; + my($factorV) = ($destB-$destT)/($srcB-$srcT); + my($factorH) = ($destR-$destL)/($srcR-$srcL); + my($vertices) = $self->length; + my($i); + for ($i=0;$i<$vertices;$i++) { + my($x,$y) = $self->getPt($i); + $x = int($destL + ($x - $srcL) * $factorH); + $y = int($destT + ($y - $srcT) * $factorV); + $self->setPt($i,$x,$y); + } +} + +# These routines added by Winfriend Koenig. +sub toPt { + my($self, $dx, $dy) = @_; + unless ($self->length > 0) { + $self->addPt($dx,$dy); + return; + } + my ($x, $y) = $self->getPt($self->length-1); + $self->addPt($x+$dx,$y+$dy); +} + +sub transform($$$$$$$) { + # see PostScript Ref. page 154 + my($self, $a, $b, $c, $d, $tx, $ty) = @_; + my $size = $self->length; + for (my $i=0;$i<$size;$i++) { + my($x,$y)=$self->getPt($i); + $self->setPt($i, $a*$x+$c*$y+$tx, $b*$x+$d*$y+$ty); + } +} + +sub scale { + my($self, $sx, $sy, $cx, $cy) = @_; + $self->offset(-$cx,-$cy) if defined $cx or defined $cy; + $self->transform($sx,0,0,$sy,$cx,$cy); +} + +1; |