| SVG - Perl extension for generating Scalable Vector Graphics documents |
SVG - Perl extension for generating Scalable Vector Graphics (SVG) documents
#!/usr/bin/perl
use strict;
use warnings;
use SVG;
# create an SVG object
my $svg= SVG->new( width => 200, height => 200);
# use explicit element constructor to generate a group element
my $y = $svg->group(
id => 'group_y',
style => {
stroke => 'red',
fill => 'green'
},
);
# add a circle to the group
$y->circle( cx => 100, cy => 100, r => 50, id => 'circle_in_group_y' );
# or, use the generic 'tag' method to generate a group element by name
my $z = $svg->tag('g',
id => 'group_z',
style => {
stroke => 'rgb(100,200,50)',
fill => 'rgb(10,100,150)'
}
);
# create and add a circle using the generic 'tag' method
$z->tag('circle', cx => 50, cy => 50, r => 100, id => 'circle_in_group_z');
# create an anchor on a rectangle within a group within the group z
my $k = $z->anchor(
id => 'anchor_k',
-href => 'http://test.hackmare.com/',
target => 'new_window_0'
)->rectangle(
x => 20, y => 50,
width => 20, height => 30,
rx => 10, ry => 5,
id => 'rect_k_in_anchor_k_in_group_z'
);
# now render the SVG object, implicitly use svg namespace
print $svg->xmlify;
# or render a child node of the SVG object without rendering the entire object
print $k->xmlify; #renders the anchor $k above containing a rectangle, but does not
#render any of the ancestor nodes of $k
# or, explicitly use svg namespace and generate a document with its own DTD
print $svg->xmlify(-namespace=>'svg');
# or, explicitly use svg namespace and generate an inline docunent
print $svg->xmlify(
-namespace => "svg",
-pubid => "-//W3C//DTD SVG 1.0//EN",
-inline => 1
);
See the other modules in this distribution: the SVG::DOM manpage, the SVG::XML manpage, the SVG::Element manpage, the SVG::Parser manpage, the SVG::Extension manpage
The convert command of http://www.imagemagick.org/ (also via the Image::Magick manpage ) can convert SVG files to PNG and other formats.
the Image::LibRSVG manpage can convert SVG to other format.
examples/circle.pl generates the following image:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd"> <svg height="200" width="200" xmlns="http://www.w3.org/2000/svg"; xmlns:svg="http://www.w3.org/2000/svg"; xmlns:xlink="http://www.w3.org/1999/xlink"> <title >I am a title</title> <g id="group_y" style="fill: green; stroke: red"> <circle cx="100" cy="100" id="circle_in_group_y" r="50" /> <!-- This is a comment --> </g> </svg>
That you can either embed directly into HTML or can include it using:
<object data="file.svg" type="image/svg+xml"></object>
(The image was converted to png using the Image::LibRSVG manpage. See the svg2png.pl script in the examples directory.)
See also the examples directory in this distribution which contain several fully documented examples.
SVG is a 100% Perl module which generates a nested data structure containing the DOM representation of an SVG (Scalable Vector Graphics) image. Using SVG, you can generate SVG objects, embed other SVG instances into it, access the DOM object, create and access javascript, and generate SMIL animation content.
Generating SVG is a simple three step process:
The xmlify method takes a number of optional arguments that control how SVG renders the object into XML, and in particular determine whether a standalone SVG document or an inline SVG document fragment is generated:
A complete SVG document with its own associated DTD. A namespace for the SVG elements may be optionally specified.
An inline SVG document fragment with no DTD that be embedded within other XML content. As with standalone documents, an alternate namespace may be specified.
No XML content is generated until the third step is reached. Up until this point, all constructed element definitions reside in a DOM-like data structure from which they can be accessed and modified.
None. However, SVG permits both options and additional element methods to be specified in the import list. These options and elements are then available for all SVG instances that are created with the new constructor. For example, to change the indent string to two spaces per level:
use SVG (-indent => " ");
With the exception of -auto, all options may also be specified to the new constructor. The currently supported options and their default value are:
# processing options
-auto => 0, # permit arbitrary autoloading of all unrecognised elements
-printerror => 1, # print error messages to STDERR
-raiseerror => 1, # die on errors (implies -printerror)
# rendering options
-indent => "\t", # what to indent with
-elsep => "\n", # element line (vertical) separator
# (note that not all agents ignor trailing blanks)
-nocredits => 0, # enable/disable credit note comment
-namespace => '', # The root element's (and it's children's) namespace prefix
# XML and Doctype declarations
-inline => 0, # inline or stand alone
-docroot => 'svg', # The document's root element
-version => '1.0',
-extension => '',
-encoding => 'UTF-8',
-xml_svg => 'http://www.w3.org/2000/svg', # the svg xmlns attribute
-xml_xlink => 'http://www.w3.org/1999/xlink', # the svg tag xmlns:xlink attribute
-standalone => 'yes',
-pubid => "-//W3C//DTD SVG 1.0//EN", # formerly -identifier
-sysid => 'http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd', # the system id
SVG also allows additional element generation methods to be specified in the import list. For example to generate 'star' and 'planet' element methods:
use SVG qw(star planet);
or:
use SVG ("star","planet");
This will add 'star' to the list of elements supported by SVG.pm (but not of course other SVG parsers...). Alternatively the '-auto' option will allow any unknown method call to generate an element of the same name:
use SVG (-auto => 1, "star", "planet");
Any elements specified explicitly (as 'star' and 'planet' are here) are predeclared; other elements are defined as and when they are seen by Perl. Note that enabling '-auto' effectively disables compile-time syntax checking for valid method names.
use SVG (
-auto => 0,
-indent => " ",
-raiseerror => 0,
-printerror => 1,
"star", "planet", "moon"
);
The Default SVG tag will generate the following XML:
$svg = SVG->new; print $svg->xmlify;
Resulting XML snippet:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg height="100%" width="100%" xmlns="http://www.w3.org/2000/svg"; xmlns:svg="http://www.w3.org/2000/svg"; xmlns:xlink="http://www.w3.org/1999/xlink">
<!--
Generated using the Perl SVG Module V2.50
by Ronan Oger
Info: http://www.roitsystems.com/
-->
SVG provides both explicit and generic element constructor methods. Explicit generators are generally (with a few exceptions) named for the element they generate. If a tag method is required for a tag containing hyphens, the method name replaces the hyphen with an underscore. ie: to generate tag <column-heading id=``new''> you would use method $svg->column_heading(id=>'new').
All element constructors take a hash of element attributes and options; element attributes such as 'id' or 'border' are passed by name, while options for the method (such as the type of an element that supports multiple alternate forms) are passed preceded by a hyphen, e.g '-type'. Both types may be freely intermixed; see the fe method and code examples througout the documentation for more examples.
$svg = SVG->new(%attributes)
Creates a new SVG object. Attributes of the document SVG element be passed as an optional list of key value pairs. Additionally, SVG options (prefixed with a hyphen) may be set on a per object basis:
my $svg1 = SVG->new;
my $svg2 = SVG->new(id => 'document_element');
my $svg3 = SVG->new(s
-printerror => 1,
-raiseerror => 0,
-indent => ' ',
-docroot => 'svg', #default document root element (SVG specification assumes svg). Defaults to 'svg' if undefined
-sysid => 'abc', #optional system identifyer
-pubid => "-//W3C//DTD SVG 1.0//EN", #public identifyer default value is "-//W3C//DTD SVG 1.0//EN" if undefined
-namespace => 'mysvg',
-inline => 1
id => 'document_element',
width => 300,
height => 200,
);
Default SVG options may also be set in the import list. See EXPORTS above for more on the available options.
Furthermore, the following options:
-version
-encoding
-standalone
-namespace Defines the document or element level namespace. The order of assignment priority is element,document .
-inline
-identifier
-nostub
-dtd (standalone)
may also be set in xmlify, overriding any corresponding values set in the SVG->new declaration
$string = $svg->xmlify(%attributes);
Returns xml representation of svg document.
XML Declaration
Name Default Value
-version '1.0'
-encoding 'UTF-8'
-standalone 'yes'
-namespace 'svg' - namespace for elements
-inline '0' - If '1', then this is an inline document.
-pubid '-//W3C//DTD SVG 1.0//EN';
-dtd (standalone) 'http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd'
$tag = $svg->tag($name, %attributes)
Generic element generator. Creates the element named $name with the attributes specified in %attributes. This method is the basis of most of the explicit element generators.
my $tag = $svg->tag('g', transform=>'rotate(-45)');
$tag = $svg->anchor(%attributes)
Generate an anchor element. Anchors are put around objects to make them 'live' (i.e. clickable). It therefore requires a drawn object or group element as a child.
the following attributes are expected for anchor tags (any any tags which use -href links):
For more information on the options, refer to the w3c XLink specification at http://www.w3.org/TR/xlink/
Example:
# generate an anchor
$tag = $SVG->anchor(
-href=>'http://here.com/some/simpler/SVG.SVG'
-title => 'new window 2 example title',
-actuate => 'onLoad',
-show=> 'embed',
);
for more information about the options above, refer to Link section in the SVG recommendation: http://www.w3.org/TR/SVG11/linking.html#Links
# add a circle to the anchor. The circle can be clicked on.
$tag->circle(cx => 10, cy => 10, r => 1);
# more complex anchor with both URL and target
$tag = $SVG->anchor(
-href => 'http://somewhere.org/some/other/page.html',
target => 'new_window'
);
# generate an anchor
$tag = $svg->anchor(
-href=>'http://here.com/some/simpler/svg.svg'
);
# add a circle to the anchor. The circle can be clicked on.
$tag->circle(cx => 10, cy => 10, r => 1);
# more complex anchor with both URL and target
$tag = $svg->anchor(
-href => 'http://somewhere.org/some/other/page.html',
target => 'new_window'
);
$tag = $svg->circle(%attributes)
Draw a circle at (cx,cy) with radius r.
my $tag = $svg->circle(cx => 4, cy => 2, r => 1);
$tag = $svg->ellipse(%attributes)
Draw an ellipse at (cx,cy) with radii rx,ry.
use SVG;
# create an SVG object
my $svg= SVG->new( width => 200, height => 200);
my $tag = $svg->ellipse(
cx => 10,
cy => 10,
rx => 5,
ry => 7,
id => 'ellipse',
style => {
'stroke' => 'red',
'fill' => 'green',
'stroke-width' => '4',
'stroke-opacity' => '0.5',
'fill-opacity' => '0.2',
}
);
See The example/ellipse.pl
$tag = $svg->rectangle(%attributes)
Draw a rectangle at (x,y) with width 'width' and height 'height' and side radii 'rx' and 'ry'.
$tag = $svg->rectangle(
x => 10,
y => 20,
width => 4,
height => 5,
rx => 5.2,
ry => 2.4,
id => 'rect_1'
);
$tag = $svg->image(%attributes)
Draw an image at (x,y) with width 'width' and height 'height' linked to image resource '-href'. See also use.
$tag = $svg->image(
x => 100,
y => 100,
width => 300,
height => 200,
'-href' => "image.png", #may also embed SVG, e.g. "image.svg"
id => 'image_1'
);
Output:
<image xlink:href="image.png" x="100" y="100" width="300" height="200"/>
$tag = $svg->use(%attributes)
Retrieve the content from an entity within an SVG document and apply it at (x,y) with width 'width' and height 'height' linked to image resource '-href'.
$tag = $svg->use(
x => 100,
y => 100,
width => 300,
height => 200,
'-href' => "pic.svg#image_1",
id => 'image_1'
);
Output:
<use xlink:href="pic.svg#image_1" x="100" y="100" width="300" height="200"/>
According to the SVG specification, the 'use' element in SVG can point to a single element within an external SVG file.
$tag = $svg->polygon(%attributes)
Draw an n-sided polygon with vertices at points defined by a string of the form 'x1,y1,x2,y2,x3,y3,... xy,yn'. The the get_path manpage method is provided as a convenience to generate a suitable string from coordinate data.
# a five-sided polygon
my $xv = [0, 2, 4, 5, 1];
my $yv = [0, 0, 2, 7, 5];
my $points = $svg->get_path(
x => $xv,
y => $yv,
-type =>'polygon'
);
my $poly = $svg->polygon(
%$points,
id => 'pgon1',
style => \%polygon_style
);
SEE ALSO:
the polyline manpage, the path manpage, the get_path manpage.
$tag = $svg->polyline(%attributes)
Draw an n-point polyline with points defined by a string of the form 'x1,y1,x2,y2,x3,y3,... xy,yn'. The get_path method is provided as a convenience to generate a suitable string from coordinate data.
# a 10-pointsaw-tooth pattern
my $xv = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
my $yv = [0, 1, 0, 1, 0, 1, 0, 1, 0, 1];
my $points = $svg->get_path(
x => $xv,
y => $yv,
-type => 'polyline',
-closed => 'true' #specify that the polyline is closed.
);
my $tag = $svg->polyline (
%$points,
id =>'pline_1',
style => {
'fill-opacity' => 0,
'stroke' => 'rgb(250,123,23)'
}
);
$tag = $svg->line(%attributes)
Draw a straight line between two points (x1,y1) and (x2,y2).
my $tag = $svg->line(
id => 'l1',
x1 => 0,
y1 => 10,
x2 => 10,
y2 => 0,
);
To draw multiple connected lines, use polyline.
$text = $svg->text(%attributes)->cdata();
$text_path = $svg->text(-type=>'path'); $text_span = $text_path->text(-type=>'span')->cdata('A'); $text_span = $text_path->text(-type=>'span')->cdata('B'); $text_span = $text_path->text(-type=>'span')->cdata('C');
Define the container for a text string to be drawn in the image.
Input:
-type = path type (path | polyline | polygon)
-type = text element type (path | span | normal [default])
my $text1 = $svg->text(
id => 'l1',
x => 10,
y => 10
)->cdata('hello, world');
my $text2 = $svg->text(
id => 'l1',
x => 10,
y => 10,
-cdata => 'hello, world',
);
my $text = $svg->text(
id => 'tp',
x => 10,
y => 10,
-type => path,
)
->text(id=>'ts' -type=>'span')
->cdata('hello, world');
SEE ALSO:
the desc manpage, the cdata manpage.
$tag = $svg->title(%attributes)
Generate the title of the image.
my $tag = $svg->title(id=>'document-title')->cdata('This is the title');
$tag = $svg->desc(%attributes)
Generate the description of the image.
my $tag = $svg->desc(id=>'document-desc')->cdata('This is a description');
$tag = $svg->comment(@comments)
Generate the description of the image.
my $tag = $svg->comment('comment 1','comment 2','comment 3');
$tag = $svg->pi(@pi)
Generate a set of processing instructions
my $tag = $svg->pi('instruction one','instruction two','instruction three');
returns:
<lt>?instruction one?<gt>
<lt>?instruction two?<gt>
<lt>?instruction three?<gt>
$tag = $svg->script(%attributes)
Generate a script container for dynamic (client-side) scripting using ECMAscript, Javascript or other compatible scripting language.
my $tag = $svg->script(-type=>"text/ecmascript");
#or my $tag = $svg->script();
#note that type ecmascript is not Mozilla compliant
# populate the script tag with cdata
# be careful to manage the javascript line ends.
# Use qq{text} or q{text} as appropriate.
# make sure to use the CAPITAL CDATA to poulate the script.
$tag->CDATA(qq{
function d() {
//simple display function
for(cnt = 0; cnt < d.length; cnt++)
document.write(d[cnt]);//end for loop
document.write("<BR>");//write a line break
}
});
$tag = $svg->path(%attributes)
Draw a path element. The path vertices may be provided as a parameter or calculated using the the get_path manpage method.
# a 10-pointsaw-tooth pattern drawn with a path definition
my $xv = [0,1,2,3,4,5,6,7,8,9];
my $yv = [0,1,0,1,0,1,0,1,0,1];
$points = $svg->get_path(
x => $xv,
y => $yv,
-type => 'path',
-closed => 'true' #specify that the polyline is closed
);
$tag = $svg->path(
%$points,
id => 'pline_1',
style => {
'fill-opacity' => 0,
'fill' => 'green',
'stroke' => 'rgb(250,123,23)'
}
);
SEE ALSO: the get_path manpage.
$path = $svg->get_path(%attributes)
Returns the text string of points correctly formatted to be incorporated into the multi-point SVG drawing object definitions (path, polyline, polygon)
Input: attributes including:
-type = path type (path | polyline | polygon)
x = reference to array of x coordinates
y = reference to array of y coordinates
Output: a hash reference consisting of the following key-value pair:
points = the appropriate points-definition string
-type = path|polygon|polyline
-relative = 1 (define relative position rather than absolute position)
-closed = 1 (close the curve - path and polygon only)
#generate an open path definition for a path.
my ($points,$p);
$points = $svg->get_path(x=>\@x,y=>\@y,-relative=>1,-type=>'path');
#add the path to the SVG document
my $p = $svg->path(%$path, style=>\%style_definition);
#generate an closed path definition for a a polyline.
$points = $svg->get_path(
x=>\@x,
y=>\@y,
-relative=>1,
-type=>'polyline',
-closed=>1
); # generate a closed path definition for a polyline
# add the polyline to the SVG document
$p = $svg->polyline(%$points, id=>'pline1');
Aliases: get_path set_path
$tag = $svg->animate(%attributes)
Generate an SMIL animation tag. This is allowed within any nonempty tag. Refer to the W3C for detailed information on the subtleties of the animate SMIL commands.
Inputs: -method = Transform | Motion | Color
my $an_ellipse = $svg->ellipse(
cx => 30,
cy => 150,
rx => 10,
ry => 10,
id => 'an_ellipse',
stroke => 'rgb(130,220,70)',
fill =>'rgb(30,20,50)'
);
$an_ellipse-> animate(
attributeName => "cx",
values => "20; 200; 20",
dur => "10s",
repeatDur => 'indefinite'
);
$an_ellipse-> animate(
attributeName => "rx",
values => "10;30;20;100;50",
dur => "10s",
repeatDur => 'indefinite',
);
$an_ellipse-> animate(
attributeName => "ry",
values => "30;50;10;20;70;150",
dur => "15s",
repeatDur => 'indefinite',
);
$an_ellipse-> animate(
attributeName=>"rx",values=>"30;75;10;100;20;20;150",
dur=>"20s", repeatDur=>'indefinite');
$an_ellipse-> animate(
attributeName=>"fill",values=>"red;green;blue;cyan;yellow",
dur=>"5s", repeatDur=>'indefinite');
$an_ellipse-> animate(
attributeName=>"fill-opacity",values=>"0;1;0.5;0.75;1",
dur=>"20s",repeatDur=>'indefinite');
$an_ellipse-> animate(
attributeName=>"stroke-width",values=>"1;3;2;10;5",
dur=>"20s",repeatDur=>'indefinite');
$tag = $svg->group(%attributes)
Define a group of objects with common properties. Groups can have style, animation, filters, transformations, and mouse actions assigned to them.
$tag = $svg->group(
id => 'xvs000248',
style => {
'font' => [ qw( Arial Helvetica sans ) ],
'font-size' => 10,
'fill' => 'red',
},
transform => 'rotate(-45)'
);
$tag = $svg->defs(%attributes)
define a definition segment. A Defs requires children when defined using SVG.pm
$tag = $svg->defs(id => 'def_con_one',);
$svg->tag('style', %styledef);
Sets/Adds style-definition for the following objects being created.
Style definitions apply to an object and all its children for all properties for which the value of the property is not redefined by the child.
$tag = $SVG->style(%attributes)
Generate a style container for inline or xlink:href based styling instructions
my $tag = $SVG->style(type=>"text/css");
# Populate the style tag with cdata.
# Be careful to manage the line ends.
# Use qq{text}, where text is the script
$tag1->CDATA(qq{
rect fill:red;stroke:green;
circle fill:red;stroke:orange;
ellipse fill:none;stroke:yellow;
text fill:black;stroke:none;
});
# Create a external CSS stylesheet reference
my $tag2 = $SVG->style(type=>"text/css", -href="/resources/example.css");
$svg->mouseaction(%attributes)
Sets/Adds mouse action definitions for tag
$svg->attrib($name, $value)
Sets/Adds attributes of an element.
Retrieve an attribute:
$svg->attrib($name);
Set a scalar attribute:
$SVG->attrib $name, $value
Set a list attribute:
$SVG->attrib $name, \@value
Set a hash attribute (i.e. style definitions):
$SVG->attrib $name, \%value
Remove an attribute:
$svg->attrib($name,undef);
Aliases: attr attribute
Sets/Replaces attributes for a tag.
$svg->cdata($text)
Sets cdata to $text. SVG.pm allows you to set cdata for any tag. If the tag is meant to be an empty tag, SVG.pm will not complain, but the rendering agent will fail. In the SVG DTD, cdata is generally only meant for adding text or script content.
$svg->text(
style => {
'font' => 'Arial',
'font-size' => 20
})->cdata('SVG.pm is a perl module on CPAN!');
my $text = $svg->text( style => { 'font' => 'Arial', 'font-size' => 20 } );
$text->cdata('SVG.pm is a perl module on CPAN!');
Result:
<text style="font: Arial; font-size: 20">SVG.pm is a perl module on CPAN!</text>
SEE ALSO:
CDATA, the desc manpage, the title manpage, the text manpage, the script manpage.
$script = $svg->script(); $script->cdata_noxmlesc($text);
Generates cdata content for text and similar tags which do not get xml-escaped. In othe words, does not parse the content and inserts the exact string into the cdata location.
$script = $svg->script(); $script->CDATA($text);
Generates a <![CDATA[ ... ]]> tag with the contents of $text rendered exactly as supplied. SVG.pm allows you to set cdata for any tag. If the tag is meant to be an empty tag, SVG.pm will not complain, but the rendering agent will fail. In the SVG DTD, cdata is generally only meant for adding text or script content.
my $text = qq{
var SVGDoc;
var groups = new Array();
var last_group;
/*****
*
* init
*
* Find this SVG's document element
* Define members of each group by id
*
*****/
function init(e) {
SVGDoc = e.getTarget().getOwnerDocument();
append_group(1, 4, 6); // group 0
append_group(5, 4, 3); // group 1
append_group(2, 3); // group 2
}};
$svg->script()->CDATA($text);
Result:
E<lt>script E<gt>
<gt>![CDATA[
var SVGDoc;
var groups = new Array();
var last_group;
/*****
*
* init
*
* Find this SVG's document element
* Define members of each group by id
*
*****/
function init(e) {
SVGDoc = e.getTarget().getOwnerDocument();
append_group(1, 4, 6); // group 0
append_group(5, 4, 3); // group 1
append_group(2, 3); // group 2
}
]]E<gt>
SEE ALSO: the cdata manpage, the script manpage.
$string = $svg->xmlescp($string)
$string = $svg->xmlesc($string)
$string = $svg->xmlescape($string)
SVG module does not xml-escape characters that are incompatible with the XML specification. xmlescp and xmlescape provides this functionality. It is a helper function which generates an XML-escaped string for reserved characters such as ampersand, open and close brackets, etcetera.
The behaviour of xmlesc is to apply the following transformation to the input string $s:
$s=~s/&(?!#(x\w\w|\d+?);)/&/g;
$s=~s/>/>/g;
$s=~s/</</g;
$s=~s/\"/"/g;
$s=~s/\'/'/g;
$s=~s/([\x00-\x08\x0b\x1f])/''/eg;
$s=~s/([\200-\377])/'&#'.ord($1).';'/ge;
$tag = $svg->filter(%attributes)
Generate a filter. Filter elements contain fe filter sub-elements.
my $filter = $svg->filter(
filterUnits=>"objectBoundingBox",
x=>"-10%",
y=>"-10%",
width=>"150%",
height=>"150%",
filterUnits=>'objectBoundingBox'
);
$filter->fe();
SEE ALSO: the fe manpage.
$tag = $svg->fe(-type=>'type', %attributes)
Generate a filter sub-element. Must be a child of a filter element.
my $fe = $svg->fe(
-type => 'DiffuseLighting' # required - element name omiting 'fe'
id => 'filter_1',
style => {
'font' => [ qw(Arial Helvetica sans) ],
'font-size' => 10,
'fill' => 'red',
},
transform => 'rotate(-45)'
);
Note that the following filter elements are currently supported: Also note that the elelemts are defined in lower case in the module, but as of version 2.441, any case combination is allowed.
SEE ALSO: the filter manpage.
$tag = $svg->pattern(%attributes)
Define a pattern for later reference by url.
my $pattern = $svg->pattern(
id => "Argyle_1",
width => "50",
height => "50",
patternUnits => "userSpaceOnUse",
patternContentUnits => "userSpaceOnUse"
);
$tag = $svg->set(%attributes)
Set a definition for an SVG object in one section, to be referenced in other sections as needed.
my $set = $svg->set(
id => "Argyle_1",
width => "50",
height => "50",
patternUnits => "userSpaceOnUse",
patternContentUnits => "userSpaceOnUse"
);
$tag = $svg->stop(%attributes)
Define a stop boundary for gradient
my $pattern = $svg->stop(
id => "Argyle_1",
width => "50",
height => "50",
patternUnits => "userSpaceOnUse",
patternContentUnits => "userSpaceOnUse"
);
$tag = $svg->gradient(%attributes)
Define a color gradient. Can be of type linear or radial
my $gradient = $svg->gradient(
-type => "linear",
id => "gradient_1"
);
The following elements are generically supported by SVG:
See e.g. pattern for an example of the use of these methods.
The following the SVG::DOM manpage elements are accessible through SVG:
SVG provides both explicit and generic element constructor methods. Explicit generators are generally (with a few exceptions) named for the element they generate. If a tag method is required for a tag containing hyphens, the method name replaces the hyphen with an underscore. ie: to generate tag <column-heading id=``new''> you would use method $svg->column_heading(id=>'new').
All element constructors take a hash of element attributes and options; element attributes such as 'id' or 'border' are passed by name, while options for the method (such as the type of an element that supports multiple alternate forms) are passed preceded by a hyphen, e.g '-type'. Both types may be freely intermixed; see the fe method and code examples througout the documentation for more examples.
$svg = SVG->new(%attributes)
Creates a new SVG object. Attributes of the document SVG element be passed as an optional list of key value pairs. Additionally, SVG options (prefixed with a hyphen) may be set on a per object basis:
my $svg1 = SVG->new;
my $svg2 = SVG->new(id => 'document_element');
my $svg3 = SVG->new(
-printerror => 1,
-raiseerror => 0,
-indent => ' ',
-elsep => "\n", # element line (vertical) separator
-docroot => 'svg', # default document root element (SVG specification assumes svg). Defaults to 'svg' if undefined
-xml_xlink => 'http://www.w3.org/1999/xlink', # required by Mozilla's embedded SVG engine
-sysid => 'abc', # optional system identifier
-pubid => "-//W3C//DTD SVG 1.0//EN", # public identifier default value is "-//W3C//DTD SVG 1.0//EN" if undefined
-namespace => 'mysvg',
-inline => 1
id => 'document_element',
width => 300,
height => 200,
);
Default SVG options may also be set in the import list. See EXPORTS above for more on the available options.
Furthermore, the following options:
-version
-encoding
-standalone
-namespace
-inline
-pubid (formerly -identifier)
-sysid (standalone)
may also be set in xmlify, overriding any corresponding values set in the SVG->new declaration
$string = $svg->xmlify(%attributes);
Returns xml representation of svg document.
XML Declaration
Name Default Value
-version '1.0'
-encoding 'UTF-8'
-standalone 'yes'
-namespace 'svg' - namespace prefix for elements.
Can also be used in any element method to over-ride
the current namespace prefix. Make sure to have
declared the prefix before using it.
-inline '0' - If '1', then this is an inline document.
-pubid '-//W3C//DTD SVG 1.0//EN';
-sysid 'http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd'
return the perl code which generates the SVG document as it currently exists.
Alias for method perlify()
Ronan Oger, RO IT Systemms GmbH, cpan@roitsystems.com
Gabor Szabo
I would like to thank the following people for contributing to this module with patches, testing, suggestions, and other nice tidbits:
Peter Wainwright, Excellent ideas, beta-testing, writing SVG::Parser and much of SVG::DOM. Fredo, http://www.penguin.at0.net/~fredo/ - provided example code and initial feedback for early SVG.pm versions and the idea of a simplified svg generator. Adam Schneider, Brial Pilpré, Ian Hickson Steve Lihn, Allen Day Martin Owens - SVG::DOM improvements in version 3.34
Copyright 2001- Ronan Oger
The modules in the SVG distribution are distributed under the same license as Perl itself. It is provided free of warranty and may be re-used freely.
SVG using Perl
SVG - Scalable Vector Graphics with Perl
Combining SVG and PSGI
the SVG::DOM manpage, the SVG::XML manpage, the SVG::Element manpage, the SVG::Parser manpage, the SVG::Extension manpage
For Commercial Perl/SVG development, refer to the following sites: ROASP.com: Serverside SVG server, ROIT Systems: Commercial SVG perl solutions, SVG at the W3C
| SVG - Perl extension for generating Scalable Vector Graphics documents |