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SVG::Element - Generate the element bits for SVG.pm |
SVG::Element - Generate the element bits for SVG.pm
Ronan Oger, ronan@roasp.com
perl(1),the SVG manpage,the SVG::XML manpage,the SVG::Element manpage,the SVG::Parser manpage, the SVG::Manual manpage http://www.roasp.com/ ROASP.com: Serverside SVG server http://www.vectoreal.com/ Vectoreal: Commercal SVG Application solutions http://www.roitsystems.com/ ROIT Systems: Commercial SVG perl solutions http://www.w3c.org/Graphics/SVG/ SVG at the W3C
$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.
Example:
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):
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'
);
$tag = $SVG->circle(%attributes)
Draw a circle at (cx,cy) with radius r.
Example:
my $tag = $SVG->circlecx=>4, cy=>2, r=>1);
$tag = $SVG->ellipse(%attributes)
Draw an ellipse at (cx,cy) with radii rx,ry.
Example:
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'
}
);
$tag = $SVG->rectangle(%attributes)
Draw a rectangle at (x,y) with width 'width' and height 'height' and side radii 'rx' and 'ry'.
Example:
$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.
Example:
$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'.
Example:
$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 get_path method is provided as a convenience to generate a suitable string from coordinate data.
Example:
# a five-sided polygon
my $xv = [0,2,4,5,1];
my $yv = [0,0,2,7,5];
$points = $a->get_path(
x=>$xv, y=>$yv,
-type=>'polygon'
);
$c = $a->polygon(
%$points,
id=>'pgon1',
style=>\%polygon_style
);
SEE ALSO:
$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.
Example:
# 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];
$points = $a->get_path(
x=>$xv, y=>$yv,
-type=>'polyline',
-closed=>'true' #specify that the polyline is closed.
);
my $tag = $a->polyline (
%$points,
id=>'pline_1',
style=>{
'fill-opacity'=>0,
'stroke-color'=>'rgb(250,123,23)'
}
);
$tag = $SVG->line(%attributes)
Draw a straight line between two points (x1,y1) and (x2,y2).
Example:
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])
Example:
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:
L<"desc">, L<"cdata">.
$tag = $SVG->title(%attributes)
Generate the title of the image.
Example:
my $tag = $SVG->title(id=>'document-title')->cdata('This is the title');
$tag = $SVG->desc(%attributes)
Generate the description of the image.
Example:
my $tag = $SVG->desc(id=>'document-desc')->cdata('This is a description');
$tag = $SVG->comment(@comments)
Generate the description of the image.
Example:
my $tag = $SVG->comment('comment 1','comment 2','comment 3');
$tag = $SVG->pi(@pi)
Generate (or adds) a set of processing instructions which go at the beginning of the document after the xml start tag
Example:
my $tag = $SVG->pi('instruction one','instruction two','instruction three');
returns:
<?instruction one?>
<?instruction two?>
<?instruction three?>
$tag = $SVG->script(%attributes)
Generate a script container for dynamic (client-side) scripting using ECMAscript, Javascript or other compatible scripting language.
Example:
my $tag = $SVG->script(type=>"text/ecmascript");
# populate the script tag with cdata
# be careful to manage the javascript line ends.
# qq|text| or qq§text§ where text is the script
# works well for this.
$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
}|
);
# create an svg external script reference to an outside file
my $tag2 = SVG->script(type=>"text/ecmascript", -href="/scripts/example.es");
$tag = $SVG->style(%attributes)
Generate a style container for inline or xlink:href based styling instructions
Example:
my $tag = $SVG->style(type=>"text/css");
# populate the style tag with cdata
# be careful to manage the line ends.
# qq|text| or qq§text§ where text is the script
# works well for this.
$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");
$tag = $SVG->path(%attributes)
Draw a path element. The path vertices may be imputed as a parameter or calculated usingthe get_path method.
Example:
# 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 = $a->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-color' => 'green',
'stroke-color' => 'rgb(250,123,23)'
}
);
SEE ALSO:
$path = $SVG->get_path(%attributes)
Returns the text string of points correctly formatted to be incorporated into the multi-point SVG drawing object definitions (path, polyline, polygon)
Input: attributes including:
-type = path type (path | polyline | polygon)
x = reference to array of x coordinates
y = reference to array of y coordinates
Output: a hash reference consisting of the following key-value pair:
points = the appropriate points-definition string
-type = path|polygon|polyline
-relative = 1 (define relative position rather than absolute position)
-closed = 1 (close the curve - path and polygon only)
Example:
#generate an open path definition for a path.
my ($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.
Example:
$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 Example:
$tag = $SVG->defs(id => 'def_con_one',);
$SVG->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.
$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
$SVG->cdata($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.
Example:
$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:
E<lt>text style="font: Arial; font-size: 20" E<gt>SVG.pm is a perl module on CPAN!E<lt>/text E<gt>
SEE ALSO:
L<"CDATA"> L<"desc">, L<"title">, L<"text">, L<"script">.
$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.
Example:
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:
L<"cdata">, L<"script">.
$tag = $SVG->filter(%attributes)
Generate a filter. Filter elements contain fe filter sub-elements.
Example:
my $filter = $SVG->filter(
filterUnits=>"objectBoundingBox",
x=>"-10%",
y=>"-10%",
width=>"150%",
height=>"150%",
filterUnits=>'objectBoundingBox'
);
$filter->fe();
SEE ALSO:
fe.
$tag = $SVG->fe(-type=>'type', %attributes)
Generate a filter sub-element. Must be a child of a filter element.
Example:
my $fe = $SVG->fe(
-type => 'diffuselighting' # required - element name in lower case 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 2.31, any case combination is allowed.
SEE ALSO:
$tag = $SVG->pattern(%attributes)
Define a pattern for later reference by url.
Example:
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.
Example:
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
Example:
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
Example:
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.
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SVG::Element - Generate the element bits for SVG.pm |