NAME

Image::Base::SVG -- SVG image file output

SYNOPSIS

 use Image::Base::SVG;
 my $image = Image::Base::SVG->new (-width => 100,
                                    -height => 100);
 $image->rectangle (0,0, 99,99, 'black');
 $image->xy (20,20, 'green');
 $image->line (50,50, 70,70, 'red');
 $image->line (50,50, 70,70, 'blue');
 $image->save ('/some/filename.svg');

CLASS HIERARCHY

"Image::Base::SVG" is a subclass of "Image::Base",

    Image::Base
      Image::Base::SVG

DESCRIPTION

"Image::Base::SVG" extends "Image::Base" to create or update SVG format image files using the "SVG" module. The "SVG" module holds the contents of an SVG file in memory as an object which can be variously manipulated. See SVG::Manual for details.

"Image::Base" is pixel oriented so isn't really the sort of thing SVG is meant for, but this module can direct "Image::Base" style code at an "SVG" object. The "SVG" module has many more features if used natively.

It's often fairly easy to spit out SVG directly too, and for instance the "Image::Base::SVGout" module can do that. The advantage of the "SVG" object comes when combining images or fragments, or going through elements for post-facto mangling.

In the current code the SVG elements emitted assume some default style attributes such as stroke-width 1. Perhaps that should be set explicitly on each element.

    #RGB                    hex, 1 digit
    #RRGGBB                 hex, 2 digit
    rgb(255,255,255)        integers 0 to 255
    rgb(100%,100%,100%)     percentages
    http://www.w3.org/TR/2008/REC-CSS2-20080411/syndata.html#value-def-color

    http://www.w3.org/TR/2003/REC-SVG11-20030114/types.html#ColorKeywords

FUNCTIONS

See "FUNCTIONS" in Image::Base for the behaviour common to all Image-Base classes.

"$image = Image::Base::SVG->new (key=>value,...)"

Create and return a new image object. A new image can be started with just

    $image = Image::Base::SVG->new;
    

Generally "-width" and "-height" should be set, but it works to do that later after creating.

Or an existing "SVG" object can be given,

    my $svg = SVG->new;
    ...
    $image = Image::Base::SVG->new (-svg_object => $svg);
    

"$image->xy ($x, $y, $colour)"

"$colour = $image->xy ($x, $y)"

Get or set an individual pixel.

Currently for a get the return is always "undef" as there's no support for picking out elements etc from the SVG. Perhaps the simple elements drawn by this "Image::Base::SVG" could be read back, but arbitrary SVG from a load() would need a full rasterize in the worst case.

"$image->load ()"

"$image->load ($filename)"

Load an SVG file into $image, either from the current "-file" attribute, or set that to $filename then load.

This uses the "SVG::Parser" module. See that module for how to choose between Expat or SAX for its underlying XML parse, and see in turn XML::SAX for its further choice of libxml, pure perl, etc. LibXML might be unhelpfully strict.

"$image->save ()"

"$image->save ($filename)"

Save the image to an SVG file, either the current "-file" option, or set that option to $filename and save to there.

ATTRIBUTES

"-width" (integer)

"-height" (integer)

Setting "-width" or "-height" changes the SVG canvas size. In the current code it doesn't affect the elements already drawn to it. Is that how it should be?

SEE ALSO

Image::Base, SVG, SVG::Manual, SVG::Parser

Image::Base::SVGout

HOME PAGE

http://user42.tuxfamily.org/image-base-svg/index.html

LICENSE

Image-Base-SVG is Copyright 2011, 2012, 2019 Kevin Ryde

Image-Base-SVG is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

Image-Base-SVG is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Image-Base-SVG. If not, see <http://www.gnu.org/licenses/>.