/usr/share/perl5/PostScript/Elements.pm is in libpostscript-perl 0.06-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 | # -*- Perl -*-
# PostScript::Elements.pm
# An object for representing lines, circles, boxes, and images
# such that they can be easily output as PostScript code.
#
# You may distribute this under the same terms as Perl
# itself.
#
PostScript::Elements::VERSION = '0.06';
package PostScript::Elements;
use strict;
# @paramnames is the list of valid parameters,
# %defaults is the hash of default values for those parameters.
#
my @paramnames = qw( type points linewidth linetint filltint );
my %defaults = (
linewidth => 1, # 1 pt
filltint => -1, # -1 represents transparent
linetint => 0, # 0 == black, 1 = white
);
sub new {
# The constructor method.
# An Element object can be one or more lines, circles,
# boxes or images.
#
my $class = shift;
my $self = [];
bless($self,$class);
return $self;
}
sub addType {
# A general routine for adding lines, circle, box, or
# image objects to an Element.
#
my $self = shift;
my %params = @_;
# If a parameter is not specified, use the default...
#
foreach (@paramnames) {
$params{$_} = $defaults{$_} unless (defined($params{$_}));
};
# Add the object to the current element
#
push @$self, { type => $params{'type'},
points => $params{'points'},
linewidth => $params{'linewidth'},
filltint => $params{'filltint'},
linetint => $params{'linetint'},
};
}
sub addArc {
# Add an arc to the Element.
# A points parameter is required, consisting of a reference to
# list specifying the center coordinate, the radius
# of the arc, and two numbers specifying the starting angle
# and the ending angle describing the sweep of the arc. E.g.:
# addArc(points=>[50,50,25,0,360])
# would add a complete circle centered at 50,50 with a radius of 25.
#
my $self = shift;
$self->addType(type => 'arc',
@_);
}
sub addBox {
# Add a Box to the Element.
# The points parameter should consist of the upper left coordinate
# of the box, its width, and its height.
#
my $self = shift;
$self->addType(type => 'box',
@_);
}
sub addLine {
# Add a Line to the Element.
# The points parameter should contain the starting coordinate and
# the end coordinate.
#
my $self = shift;
$self->addType(type => 'line',
@_);
}
sub Write() {
# A method to create the PostScript code that will render the
# objects in the Element.
#
my $self = shift;
my $returnval = "";
my ($width, $height);
foreach my $element (@$self) {
# Generate the appropriate PostScript based on the
# type attribute.
# Arc:
if ($element->{type} =~ /arc/i) {
# First save the current path (if any),
# then create the path of the arc
#
$returnval .= "gsave\n".
$element->{'points'}->[0]." ". # x value
$element->{'points'}->[1]." ". # y value
$element->{'points'}->[2]." ". # radius
$element->{'points'}->[3]." ". # start angle
$element->{'points'}->[4]." ". # end angle
"arc\n";
# Don't fill the arc if filltint attribute is -1
# otherwise fill the current path with the tint specified by
# the filltint attribute. Save the path so it can be restored
# after the fill and it can be used by the stroke function.
#
if ($element->{'filltint'} >= 0 ) {
$returnval .= $element->{'filltint'}." setgray\n".
"gsave \nfill \ngrestore\n";
}
# Stroke the arc with the width indicated by linewidth
# and a greyscale percentage specified by linetint
#
$returnval .= $element->{'linetint'}." setgray\n".
$element->{'linewidth'}." setlinewidth\n".
"stroke\n".
"1 setgray\n".
$defaults{'linewidth'}." setlinewidth\n".
"grestore\n";
# Box:
#
} elsif ($element->{type} =~ /box/i) {
# A box is described by the upper left corner, a width
# and a height
#
$width = $element->{'points'}->[2];
$height = $element->{'points'}->[3];
$returnval .= "gsave\n";
$returnval .= $element->{'points'}->[0]." ". # x value
$element->{'points'}->[1]." ". # y value
"moveto\n".
# now draw it clockwise...
#
"$width 0 rlineto\n".
"0 ".(0-$height)." rlineto\n".
(0-$width)." 0 rlineto\n".
"0 $height rlineto\n".
"closepath\n";
# Don't fill the box if filltint attribute is -1
#
if ($element->{'filltint'} >= 0 ) {
$returnval .= $element->{'filltint'}." setgray\n".
"gsave \nfill \ngrestore\n";
}
$returnval .= $element->{'linetint'}." setgray\n".
$element->{'linewidth'}." setlinewidth\n".
"stroke\n".
"1 setgray\n".
$defaults{'linewidth'}." setlinewidth\n".
"grestore\n";
# Line:
#
} elsif ($element->{type} =~ /line/i) {
$returnval .= "gsave\n";
$returnval .= $element->{'points'}->[0]." ". # start x
$element->{'points'}->[1]." ". # start y
"moveto\n".
$element->{'points'}->[2]." ". # end x
$element->{'points'}->[3]." ". # end y
"lineto\n".
$element->{'linetint'}." setgray\n".
$element->{'linewidth'}." setlinewidth\n".
"stroke\n".
"1 setgray\n".
$defaults{'linewidth'}." setlinewidth\n".
"grestore\n";
} else {
# Do nothing
}
}
return ($returnval);
}
1;
__END__
=head1 NAME
PostScript::Elements - Generate PostScript code for circles, boxes, lines
=head1 DESCRIPTION
An object for representing lines, circles, boxes, and images
such that they can be easily output as PostScript code.
=head1 SYNOPSIS
=head1 AUTHOR
=cut
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