Last Change: 2018-09-07, 16:50
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SVG::Graph − Visualize your data in Scalable Vector Graphics (SVG) format.
use SVG::Graph;
use SVG::Graph::Data;
use SVG::Graph::Data::Datum;
#create a new SVG document to plot in...
my $graph = SVG::Graph−>new(width=>600,height=>600,margin=>30);
#and create a frame to hold the data/glyphs
my $frame = $graph−>add_frame;
#let's plot y = x^2
my @data = map {SVG::Graph::Data::Datum−>new(x=>$_,y=>$_^2)}
(1,2,3,4,5);
my $data = SVG::Graph::Data−>new(data => \@data);
#put the xy data into the frame
$frame−>add_data($data);
#add some glyphs to apply to the data in the frame
$frame−>add_glyph('axis', #add an axis glyph
'x_absolute_ticks' => 1, #with ticks every one
#unit on the x axis
'y_absolute_ticks' => 1, #and ticks every one
#unit on the y axis
'stroke' => 'black', #draw the axis black
'stroke−width' => 2, #and 2px thick
);
$frame−>add_glyph('scatter', #add a scatterplot glyph
'stroke' => 'red', #the dots will be outlined
#in red,
'fill' => 'red', #filled red,
'fill−opacity' => 0.5, #and 50% opaque
);
#print the graphic
print $graph−>draw;
SVG::Graph is a suite of perl modules for plotting data. SVG::Graph currently supports plots of one−, two− and three-dimensional data, as well as N−ary rooted trees. Data may be represented as:
Glyph Name Dimensionality supported
1d 2d 3d tree
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
Axis x
Bar Graph x
Bubble Plot x
Heatmap Graph x
Line Graph x
Pie Graph x
Scatter Plot x
Spline Graph x
Tree x
SVG::Graph 0.02 is a pre-alpha release. Keep in mind that many of the glyphs are not very robust.
You need to create a SVG::Graph::Frame instance from the parent SVG::Graph instance for each set of data to be plotted. Datasets can be hierarchical, and to represent this, SVG::Graph::Frame instances can themselves contain subframes. SVG::Graph::Frame can contain:
− multiple subframes as instances of SVG::Graph::Frame − a single SVG::Graph::Data instance − multiple SVG::Graph::Glyph instances with which to render the attached SVG::Graph::Data instance, and all SVG::Graph::Data instances attached to SVG::Graph::Frame subinstances
See SVG::Graph::Frame and SVG::Graph::Glyph for details.
ONE DATA SET
1. create an SVG::Graph instance
2. create an SVG::Graph::Frame instance by calling
SVG::Graph::add_frame();
3. create an SVG::Graph::Data instance, containing
an SVG::Graph::Data::Datum instance for each data point.
4. Attach the SVG::Graph::Data instance to your SVG::Graph::Frame
using SVG::Graph::Frame::add_data();
5. Attach glyphs to the SVG::Graph::Frame instance using
SVG::Graph::Frame::add_glyph();
6. Call SVG::Graph::draw();
MULTIPLE DATA SETS
1. create an SVG::Graph instance
2. create an SVG::Graph::Frame instance by calling
SVG::Graph::add_frame();
3. create an SVG::Graph::Data instance, containing
an SVG::Graph::Data::Datum instance for each data point.
4. Attach the SVG::Graph::Data instance to your SVG::Graph::Frame
using SVG::Graph::Frame::add_data();
5. Attach glyphs to the SVG::Graph::Frame instance using
SVG::Graph::Frame::add_glyph();
6. repeat [2−5] for each additional data set to be added.
add_frame() can be called on SVG::Graph to add top−level data
sets, or SVG::Graph::Frame to add hierarchical data sets.
7. Call SVG::Graph::draw();
Send an email to the svg-graph-developers list. For more info, visit the project page at http://www.sf.net/projects/svg−graph
Allen Day, <allenday AT ucla DOT edu> Chris To, <crsto AT ucla DOT edu>
James Chen, <chenj AT seas DOT ucla DOT edu> Brian O'Connor, <boconnor AT ucla DOT edu>
SVG
new
Title : new
Usage : my $graph = SVG::Graph−>new(width=>600,
height=>600,
margin=>20);
Function: creates a new SVG::Graph object
Returns : a SVG::Graph object
Args : width => the width of the SVG
height => the height of the SVG
margin => margin for the root frame
init
Title : init Usage : Function: Example : Returns : Args :
width
Title : width Usage : $obj−>width($newval) Function: Example : Returns : value of width (a scalar) Args : on set, new value (a scalar or undef, optional)
height
Title : height Usage : $obj−>height($newval) Function: Example : Returns : value of height (a scalar) Args : on set, new value (a scalar or undef, optional)
margin
Title : margin Usage : $obj−>margin($newval) Function: Example : Returns : value of margin (a scalar) Args : on set, new value (a scalar or undef, optional)
svg
Title : svg Usage : $obj−>svg($newval) Function: Example : Returns : value of svg (a scalar) Args : on set, new value (a scalar or undef, optional)
add_frame
Title : add_frame
Usage : my $frame = $graph−>add_frame
Function: adds a Frame to the current Graph
Returns : a SVG::Graph::Frame object
Args : a hash. usable keys:
frame_transform (optional)
'top' default orientation
'bottom' rotates graph 180 deg (about the center)
'right' points top position towards right
'left' points top position towards left
frames
Title : frames Usage : get/set Function: Example : Returns : Args :
xoffset
Title : xoffset Usage : $obj−>xoffset($newval) Function: Example : Returns : value of xoffset (a scalar) Args : on set, new value (a scalar or undef, optional)
yoffset
Title : yoffset Usage : $obj−>yoffset($newval) Function: Example : Returns : value of yoffset (a scalar) Args : on set, new value (a scalar or undef, optional)
draw
Title : draw Usage : $graph=>draw Function: depends on child glyph implementations Returns : xmlifyied SVG object Args : none