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sugar-toolkit-gtk3/chat/SVGdraw.py

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#!/usr/bin/env python
##Copyright (c) 2002, Fedor Baart & Hans de Wit (Stichting Farmaceutische Kengetallen)
##All rights reserved.
##
##Redistribution and use in source and binary forms, with or without modification,
##are permitted provided that the following conditions are met:
##
##Redistributions of source code must retain the above copyright notice, this
##list of conditions and the following disclaimer.
##
##Redistributions in binary form must reproduce the above copyright notice,
##this list of conditions and the following disclaimer in the documentation and/or
##other materials provided with the distribution.
##
##Neither the name of the Stichting Farmaceutische Kengetallen nor the names of
##its contributors may be used to endorse or promote products derived from this
##software without specific prior written permission.
##
##THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
##AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
##IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
##DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
##FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
##DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
##SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
##CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
##OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
##OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##Thanks to Gerald Rosennfellner for his help and useful comments.
__doc__="""Use SVGdraw to generate your SVGdrawings.
SVGdraw uses an object model drawing and a method toXML to create SVG graphics
by using easy to use classes and methods usualy you start by creating a drawing eg
d=drawing()
#then you create a SVG root element
s=svg()
#then you add some elements eg a circle and add it to the svg root element
c=circle()
#you can supply attributes by using named arguments.
c=circle(fill='red',stroke='blue')
#or by updating the attributes attribute:
c.attributes['stroke-width']=1
s.addElement(c)
#then you add the svg root element to the drawing
d.setSVG(s)
#and finaly you xmlify the drawing
d.toXml()
this results in the svg source of the drawing, which consists of a circle
on a white background. Its as easy as that;)
This module was created using the SVG specification of www.w3c.org and the
O'Reilly (www.oreilly.com) python books as information sources. A svg viewer
is available from www.adobe.com"""
__version__="1.0"
# there are two possibilities to generate svg:
# via a dom implementation and directly using <element>text</element> strings
# the latter is way faster (and shorter in coding)
# the former is only used in debugging svg programs
# maybe it will be removed alltogether after a while
# with the following variable you indicate whether to use the dom implementation
# Note that PyXML is required for using the dom implementation.
# It is also possible to use the standard minidom. But I didn't try that one.
# Anyway the text based approach is about 60 times faster than using the full dom implementation.
use_dom_implementation=0
import exceptions
if use_dom_implementation<>0:
try:
from xml.dom import implementation
from xml.dom.ext import PrettyPrint
except:
raise exceptions.ImportError, "PyXML is required for using the dom implementation"
#The implementation is used for the creating the XML document.
#The prettyprint module is used for converting the xml document object to a xml file
import sys
assert sys.version_info[0]>=2
if sys.version_info[1]<2:
True=1
False=0
file=open
sys.setrecursionlimit=50
#The recursion limit is set conservative so mistakes like s=svg() s.addElement(s)
#won't eat up too much processor time.
xlinkNSRef = "http://www.w3.org/1999/xlink"
#the following code is pasted form xml.sax.saxutils
#it makes it possible to run the code without the xml sax package installed
#To make it possible to have <rubbish> in your text elements, it is necessary to escape the texts
def _escape(data, entities={}):
"""Escape &, <, and > in a string of data.
You can escape other strings of data by passing a dictionary as
the optional entities parameter. The keys and values must all be
strings; each key will be replaced with its corresponding value.
"""
data = data.replace("&", "&amp;")
data = data.replace("<", "&lt;")
data = data.replace(">", "&gt;")
for chars, entity in entities.items():
data = data.replace(chars, entity)
return data
def _quoteattr(data, entities={}):
"""Escape and quote an attribute value.
Escape &, <, and > in a string of data, then quote it for use as
an attribute value. The \" character will be escaped as well, if
necessary.
You can escape other strings of data by passing a dictionary as
the optional entities parameter. The keys and values must all be
strings; each key will be replaced with its corresponding value.
"""
data = _escape(data, entities)
if '"' in data:
if "'" in data:
data = '"%s"' % data.replace('"', "&quot;")
else:
data = "'%s'" % data
else:
data = '"%s"' % data
return data
def _xypointlist(a):
"""formats a list of xy pairs"""
s=''
for e in a: #this could be done more elegant
s+=str(e)[1:-1] +' '
return s
def _viewboxlist(a):
"""formats a tuple"""
s=''
for e in a:
s+=str(e)+' '
return s
def _pointlist(a):
"""formats a list of numbers"""
return str(a)[1:-1]
class pathdata:
"""class used to create a pathdata object which can be used for a path.
although most methods are pretty straightforward it might be useful to look at the SVG specification."""
#I didn't test the methods below.
def __init__(self,x=None,y=None):
self.path=[]
if x is not None and y is not None:
self.path.append('M '+str(x)+' '+str(y))
def closepath(self):
"""ends the path"""
self.path.append('z')
def move(self,x,y):
"""move to absolute"""
self.path.append('M '+str(x)+' '+str(y))
def relmove(self,x,y):
"""move to relative"""
self.path.append('m '+str(x)+' '+str(y))
def line(self,x,y):
"""line to absolute"""
self.path.append('L '+str(x)+' '+str(y))
def relline(self,x,y):
"""line to relative"""
self.path.append('l '+str(x)+' '+str(y))
def hline(self,x):
"""horizontal line to absolute"""
self.path.append('H'+str(x))
def relhline(self,x):
"""horizontal line to relative"""
self.path.append('h'+str(x))
def vline(self,y):
"""verical line to absolute"""
self.path.append('V'+str(y))
def relvline(self,y):
"""vertical line to relative"""
self.path.append('v'+str(y))
def bezier(self,x1,y1,x2,y2,x,y):
"""bezier with xy1 and xy2 to xy absolut"""
self.path.append('C'+str(x1)+','+str(y1)+' '+str(x2)+','+str(y2)+' '+str(x)+','+str(y))
def relbezier(self,x1,y1,x2,y2,x,y):
"""bezier with xy1 and xy2 to xy relative"""
self.path.append('c'+str(x1)+','+str(y1)+' '+str(x2)+','+str(y2)+' '+str(x)+','+str(y))
def smbezier(self,x2,y2,x,y):
"""smooth bezier with xy2 to xy absolut"""
self.path.append('S'+str(x2)+','+str(y2)+' '+str(x)+','+str(y))
def relsmbezier(self,x2,y2,x,y):
"""smooth bezier with xy2 to xy relative"""
self.path.append('s'+str(x2)+','+str(y2)+' '+str(x)+','+str(y))
def qbezier(self,x1,y1,x,y):
"""quadratic bezier with xy1 to xy absolut"""
self.path.append('Q'+str(x1)+','+str(y1)+' '+str(x)+','+str(y))
def relqbezier(self,x1,y1,x,y):
"""quadratic bezier with xy1 to xy relative"""
self.path.append('q'+str(x1)+','+str(y1)+' '+str(x)+','+str(y))
def smqbezier(self,x,y):
"""smooth quadratic bezier to xy absolut"""
self.path.append('T'+str(x)+','+str(y))
def relsmqbezier(self,x,y):
"""smooth quadratic bezier to xy relative"""
self.path.append('t'+str(x)+','+str(y))
def ellarc(self,rx,ry,xrot,laf,sf,x,y):
"""elliptival arc with rx and ry rotating with xrot using large-arc-flag and sweep-flag to xy absolut"""
self.path.append('A'+str(rx)+','+str(ry)+' '+str(xrot)+' '+str(laf)+' '+str(sf)+' '+str(x)+' '+str(y))
def relellarc(self,rx,ry,xrot,laf,sf,x,y):
"""elliptival arc with rx and ry rotating with xrot using large-arc-flag and sweep-flag to xy relative"""
self.path.append('a'+str(rx)+','+str(ry)+' '+str(xrot)+' '+str(laf)+' '+str(sf)+' '+str(x)+' '+str(y))
def __repr__(self):
return ' '.join(self.path)
class Attribute:
def __init__(self, name, value, nsname=None, nsref=None):
self.name = name
self.value = value
self.nsname = nsname
self.nsref = nsref
class SVGelement:
"""SVGelement(type,attributes,elements,text,namespace,**args)
Creates a arbitrary svg element and is intended to be subclassed not used on its own.
This element is the base of every svg element it defines a class which resembles
a xml-element. The main advantage of this kind of implementation is that you don't
have to create a toXML method for every different graph object. Every element
consists of a type, attribute, optional subelements, optional text and an optional
namespace. Note the elements==None, if elements = None:self.elements=[] construction.
This is done because if you default to elements=[] every object has a reference
to the same empty list."""
def __init__(self,type='',attributes=None,elements=None,text='',namespace='',cdata=None,**args):
self.type=type
self._attributes={}
if attributes:
for key, value in attributes.items():
attr = Attribute(key, value)
self._attributes[key] = attr
self.elements=[]
if elements:
self.elements=elements
self.text=text
self.namespace=namespace
self.cdata=cdata
for key, value in args.items():
attr = Attribute(key, value)
self._attributes[key] = attr
self._parent = None
def addElement(self,SVGelement):
"""adds an element to a SVGelement
SVGelement.addElement(SVGelement)
"""
self.elements.append(SVGelement)
SVGelement.setParent(self)
def setParent(self, parent):
self._parent = parent
def addAttribute(self, attribute):
self._attributes[attribute.name] = attribute
def toXml(self,level,f):
f.write('\t'*level)
f.write('<'+self.type)
if self.namespace:
f.write(' xmlns="'+ _escape(str(self.namespace))+'" ')
for attkey, attr in self._attributes.items():
if attr.nsname:
f.write(' xmlns:'+_escape(str(attr.nsname))+'="'+_escape(str(attr.nsref))+'" ')
f.write(' '+_escape(str(attr.nsname))+':'+_escape(str(attkey))+'='+_quoteattr(str(attr.value)))
else:
f.write(' '+_escape(str(attkey))+'='+_quoteattr(str(attr.value)))
if self.elements or self.text or self.cdata:
f.write('>')
if self.elements:
f.write('\n')
for element in self.elements:
element.toXml(level+1,f)
if self.cdata:
f.write('\n'+'\t'*(level+1)+'<![CDATA[')
for line in self.cdata.splitlines():
f.write('\n'+'\t'*(level+2)+line)
f.write('\n'+'\t'*(level+1)+']]>\n')
if self.text:
if type(self.text)==type(''): #If the text is only text
f.write(_escape(str(self.text)))
else: #If the text is a spannedtext class
f.write(str(self.text))
if self.elements:
f.write('\t'*level+'</'+self.type+'>\n')
elif self.text:
f.write('</'+self.type+'>\n')
elif self.cdata:
f.write('\t'*level+'</'+self.type+'>\n')
else:
f.write('/>\n')
class tspan(SVGelement):
"""ts=tspan(text='',**args)
a tspan element can be used for applying formatting to a textsection
usage:
ts=tspan('this text is bold')
ts.attributes['font-weight']='bold'
st=spannedtext()
st.addtspan(ts)
t=text(3,5,st)
"""
def __init__(self,text=None,**args):
SVGelement.__init__(self,'tspan',**args)
if self.text<>None:
self.text=text
def __repr__(self):
s="<tspan"
for key, attr in self._attributes.items():
s+= ' %s="%s"' % (key,attr.value)
s+='>'
s+=self.text
s+='</tspan>'
return s
class tref(SVGelement):
"""tr=tref(link='',**args)
a tref element can be used for referencing text by a link to its id.
usage:
tr=tref('#linktotext')
st=spannedtext()
st.addtref(tr)
t=text(3,5,st)
"""
def __init__(self,link,**args):
SVGelement.__init__(self,'tref',**args)
self.addAttribute(Attribute('href', link, 'xlink', xlinkNSRef))
def __repr__(self):
s="<tref"
for key, attr in self._attributes.items():
s+= ' %s="%s"' % (key,attr.value)
s+='/>'
return s
class spannedtext:
"""st=spannedtext(textlist=[])
a spannedtext can be used for text which consists of text, tspan's and tref's
You can use it to add to a text element or path element. Don't add it directly
to a svg or a group element.
usage:
ts=tspan('this text is bold')
ts.attributes['font-weight']='bold'
tr=tref('#linktotext')
tr.attributes['fill']='red'
st=spannedtext()
st.addtspan(ts)
st.addtref(tr)
st.addtext('This text is not bold')
t=text(3,5,st)
"""
def __init__(self,textlist=None):
if textlist==None:
self.textlist=[]
else:
self.textlist=textlist
def addtext(self,text=''):
self.textlist.append(text)
def addtspan(self,tspan):
self.textlist.append(tspan)
def addtref(self,tref):
self.textlist.append(tref)
def __repr__(self):
s=""
for element in self.textlist:
s+=str(element)
return s
class rect(SVGelement):
"""r=rect(width,height,x,y,fill,stroke,stroke_width,**args)
a rectangle is defined by a width and height and a xy pair
"""
def __init__(self,x=None,y=None,width=None,height=None,fill=None,stroke=None,stroke_width=None,**args):
if width==None or height==None:
if width<>None:
raise ValueError, 'height is required'
if height<>None:
raise ValueError, 'width is required'
else:
raise ValueError, 'both height and width are required'
SVGelement.__init__(self,'rect',{'width':width,'height':height},**args)
if x<>None:
self.addAttribute(Attribute('x', x))
if y<>None:
self.addAttribute(Attribute('y', y))
if fill<>None:
self.addAttribute(Attribute('fill', fill))
if stroke<>None:
self.addAttribute(Attribute('stroke', stroke))
if stroke_width<>None:
self.addAttribute(Attribute('stroke-width', stroke_width))
class ellipse(SVGelement):
"""e=ellipse(rx,ry,x,y,fill,stroke,stroke_width,**args)
an ellipse is defined as a center and a x and y radius.
"""
def __init__(self,cx=None,cy=None,rx=None,ry=None,fill=None,stroke=None,stroke_width=None,**args):
if rx==None or ry== None:
if rx<>None:
raise ValueError, 'rx is required'
if ry<>None:
raise ValueError, 'ry is required'
else:
raise ValueError, 'both rx and ry are required'
SVGelement.__init__(self,'ellipse',{'rx':rx,'ry':ry},**args)
if cx<>None:
self.addAttribute(Attribute('cx', cx))
if cy<>None:
self.addAttribute(Attribute('cy', cy))
if fill<>None:
self.addAttribute(Attribute('fill', fill))
if stroke<>None:
self.addAttribute(Attribute('stroke', stroke))
if stroke_width<>None:
self.addAttribute(Attribute('stroke-width', stroke_width))
class circle(SVGelement):
"""c=circle(x,y,radius,fill,stroke,stroke_width,**args)
The circle creates an element using a x, y and radius values eg
"""
def __init__(self,cx=None,cy=None,r=None,fill=None,stroke=None,stroke_width=None,**args):
if r==None:
raise ValueError, 'r is required'
SVGelement.__init__(self,'circle',{'r':r},**args)
if cx<>None:
self.addAttribute(Attribute('cx', cx))
if cy<>None:
self.addAttribute(Attribute('cy', cy))
if fill<>None:
self.addAttribute(Attribute('fill', fill))
if stroke<>None:
self.addAttribute(Attribute('stroke', stroke))
if stroke_width<>None:
self.addAttribute(Attribute('stroke-width', stroke_width))
class point(circle):
"""p=point(x,y,color)
A point is defined as a circle with a size 1 radius. It may be more efficient to use a
very small rectangle if you use many points because a circle is difficult to render.
"""
def __init__(self,x,y,fill='black',**args):
circle.__init__(self,x,y,1,fill,**args)
class line(SVGelement):
"""l=line(x1,y1,x2,y2,stroke,stroke_width,**args)
A line is defined by a begin x,y pair and an end x,y pair
"""
def __init__(self,x1=None,y1=None,x2=None,y2=None,stroke=None,stroke_width=None,**args):
SVGelement.__init__(self,'line',**args)
if x1<>None:
self.addAttribute(Attribute('x1', x1))
if y1<>None:
self.addAttribute(Attribute('y1', y1))
if x2<>None:
self.addAttribute(Attribute('x2', x2))
if y2<>None:
self.addAttribute(Attribute('y2', y2))
if stroke_width<>None:
self.addAttribute(Attribute('stroke-width', stroke_width))
if stroke<>None:
self.addAttribute(Attribute('stroke', stroke))
class polyline(SVGelement):
"""pl=polyline([[x1,y1],[x2,y2],...],fill,stroke,stroke_width,**args)
a polyline is defined by a list of xy pairs
"""
def __init__(self,points,fill=None,stroke=None,stroke_width=None,**args):
SVGelement.__init__(self,'polyline',{'points':_xypointlist(points)},**args)
if fill<>None:
self.addAttribute(Attribute('fill', fill))
if stroke_width<>None:
self.addAttribute(Attribute('stroke-width', stroke_width))
if stroke<>None:
self.addAttribute(Attribute('stroke', stroke))
class polygon(SVGelement):
"""pl=polyline([[x1,y1],[x2,y2],...],fill,stroke,stroke_width,**args)
a polygon is defined by a list of xy pairs
"""
def __init__(self,points,fill=None,stroke=None,stroke_width=None,**args):
SVGelement.__init__(self,'polygon',{'points':_xypointlist(points)},**args)
if fill<>None:
self.addAttribute(Attribute('fill', fill))
if stroke_width<>None:
self.addAttribute(Attribute('stroke-width', stroke_width))
if stroke<>None:
self.addAttribute(Attribute('stroke', stroke))
class path(SVGelement):
"""p=path(path,fill,stroke,stroke_width,**args)
a path is defined by a path object and optional width, stroke and fillcolor
"""
def __init__(self,pathdata,fill=None,stroke=None,stroke_width=None,id=None,**args):
SVGelement.__init__(self,'path',{'d':str(pathdata)},**args)
if stroke<>None:
self.addAttribute(Attribute('stroke', stroke))
if fill<>None:
self.addAttribute(Attribute('fill', fill))
if stroke_width<>None:
self.addAttribute(Attribute('stroke-width', stroke_width))
if id<>None:
self.addAttribute(Attribute('id', id))
class text(SVGelement):
"""t=text(x,y,text,font_size,font_family,**args)
a text element can bge used for displaying text on the screen
"""
def __init__(self,x=None,y=None,text=None,font_size=None,font_family=None,text_anchor=None,**args):
SVGelement.__init__(self,'text',**args)
if x<>None:
self.addAttribute(Attribute('x', x))
if y<>None:
self.addAttribute(Attribute('y', y))
if font_size<>None:
self.addAttribute(Attribute('font-size', font_size))
if font_family<>None:
self.addAttribute(Attribute('font-family', font_family))
if text<>None:
self.text=text
if text_anchor<>None:
self.addAttribute(Attribute('text-anchor', text_anchor))
class textpath(SVGelement):
"""tp=textpath(text,link,**args)
a textpath places a text on a path which is referenced by a link.
"""
def __init__(self,link,text=None,**args):
SVGelement.__init__(self,'textPath',**args)
self.addAttribute(Attribute('href', link, 'xlink', xlinkNSRef))
if text<>None:
self.text=text
class pattern(SVGelement):
"""p=pattern(x,y,width,height,patternUnits,**args)
A pattern is used to fill or stroke an object using a pre-defined
graphic object which can be replicated ("tiled") at fixed intervals
in x and y to cover the areas to be painted.
"""
def __init__(self,x=None,y=None,width=None,height=None,patternUnits=None,**args):
SVGelement.__init__(self,'pattern',**args)
if x<>None:
self.addAttribute(Attribute('x', x))
if y<>None:
self.addAttribute(Attribute('y', y))
if width<>None:
self.addAttribute(Attribute('width', width))
if height<>None:
self.addAttribute(Attribute('height', height))
if patternUnits<>None:
self.addAttribute(Attribute('patternUnits', patternUnits))
class title(SVGelement):
"""t=title(text,**args)
a title is a text element. The text is displayed in the title bar
add at least one to the root svg element
"""
def __init__(self,text=None,**args):
SVGelement.__init__(self,'title',**args)
if text<>None:
self.text=text
class description(SVGelement):
"""d=description(text,**args)
a description can be added to any element and is used for a tooltip
Add this element before adding other elements.
"""
def __init__(self,text=None,**args):
SVGelement.__init__(self,'desc',**args)
if text<>None:
self.text=text
class lineargradient(SVGelement):
"""lg=lineargradient(x1,y1,x2,y2,id,**args)
defines a lineargradient using two xy pairs.
stop elements van be added to define the gradient colors.
"""
def __init__(self,x1=None,y1=None,x2=None,y2=None,id=None,**args):
SVGelement.__init__(self,'linearGradient',**args)
if x1<>None:
self.addAttribute(Attribute('x1', x1))
if y1<>None:
self.addAttribute(Attribute('y1', y1))
if x2<>None:
self.addAttribute(Attribute('x2', x2))
if y2<>None:
self.addAttribute(Attribute('y2', y2))
if id<>None:
self.addAttribute(Attribute('id', id))
class radialgradient(SVGelement):
"""rg=radialgradient(cx,cy,r,fx,fy,id,**args)
defines a radial gradient using a outer circle which are defined by a cx,cy and r and by using a focalpoint.
stop elements van be added to define the gradient colors.
"""
def __init__(self,cx=None,cy=None,r=None,fx=None,fy=None,id=None,**args):
SVGelement.__init__(self,'radialGradient',**args)
if cx<>None:
self.addAttribute(Attribute('cx', cx))
if cy<>None:
self.addAttribute(Attribute('cy', cy))
if r<>None:
self.addAttribute(Attribute('r', r))
if fx<>None:
self.addAttribute(Attribute('fx', fx))
if fy<>None:
self.addAttribute(Attribute('fy', fy))
if id<>None:
self.addAttribute(Attribute('id', id))
class stop(SVGelement):
"""st=stop(offset,stop_color,**args)
Puts a stop color at the specified radius
"""
def __init__(self,offset,stop_color=None,**args):
SVGelement.__init__(self,'stop',{'offset':offset},**args)
if stop_color<>None:
self.addAttribute(Attribute('stop-color', stop_color))
class style(SVGelement):
"""st=style(type,cdata=None,**args)
Add a CDATA element to this element for defing in line stylesheets etc..
"""
def __init__(self,type,cdata=None,**args):
SVGelement.__init__(self,'style',{'type':type},cdata=cdata, **args)
class image(SVGelement):
"""im=image(url,width,height,x,y,**args)
adds an image to the drawing. Supported formats are .png, .jpg and .svg.
"""
def __init__(self,url,x=None,y=None,width=None,height=None,**args):
if width==None or height==None:
if width<>None:
raise ValueError, 'height is required'
if height<>None:
raise ValueError, 'width is required'
else:
raise ValueError, 'both height and width are required'
SVGelement.__init__(self,'image',{'width':width,'height':height},**args)
self.addAttribute(Attribute('href', url, 'xlink', xlinkNSRef))
if x<>None:
self.addAttribute(Attribute('x', x))
if y<>None:
self.addAttribute(Attribute('y', y))
class cursor(SVGelement):
"""c=cursor(url,**args)
defines a custom cursor for a element or a drawing
"""
def __init__(self,url,**args):
SVGelement.__init__(self,'cursor',**args)
self.addAttribute(Attribute('href', url, 'xlink', xlinkNSRef))
class marker(SVGelement):
"""m=marker(id,viewbox,refX,refY,markerWidth,markerHeight,**args)
defines a marker which can be used as an endpoint for a line or other pathtypes
add an element to it which should be used as a marker.
"""
def __init__(self,id=None,viewBox=None,refx=None,refy=None,markerWidth=None,markerHeight=None,**args):
SVGelement.__init__(self,'marker',**args)
if id<>None:
self.addAttribute(Attribute('id', id))
if viewBox<>None:
self.addAttribute(Attribute('viewBox', _viewboxlist(viewBox)))
if refx<>None:
self.addAttribute(Attribute('refX', refx))
if refy<>None:
self.addAttribute(Attribute('refY', refy))
if markerWidth<>None:
self.addAttribute(Attribute('markerWidth', markerWidth))
if markerHeight<>None:
self.addAttribute(Attribute('markerHeight', markerHeight))
class group(SVGelement):
"""g=group(id,**args)
a group is defined by an id and is used to contain elements
g.addElement(SVGelement)
"""
def __init__(self,id=None,**args):
SVGelement.__init__(self,'g',**args)
if id<>None:
self.addAttribute(Attribute('id', id))
class symbol(SVGelement):
"""sy=symbol(id,viewbox,**args)
defines a symbol which can be used on different places in your graph using
the use element. A symbol is not rendered but you can use 'use' elements to
display it by referencing its id.
sy.addElement(SVGelement)
"""
def __init__(self,id=None,viewBox=None,**args):
SVGelement.__init__(self,'symbol',**args)
if id<>None:
self.addAttribute(Attribute('id', id))
if viewBox<>None:
self.addAttribute(Attribute('viewBox', _viewboxlist(viewBox)))
class defs(SVGelement):
"""d=defs(**args)
container for defining elements
"""
def __init__(self,**args):
SVGelement.__init__(self,'defs',**args)
class switch(SVGelement):
"""sw=switch(**args)
Elements added to a switch element which are "switched" by the attributes
requiredFeatures, requiredExtensions and systemLanguage.
Refer to the SVG specification for details.
"""
def __init__(self,**args):
SVGelement.__init__(self,'switch',**args)
class use(SVGelement):
"""u=use(link,x,y,width,height,**args)
references a symbol by linking to its id and its position, height and width
"""
def __init__(self,link,x=None,y=None,width=None,height=None,**args):
SVGelement.__init__(self,'use',**args)
self.addAttribute(Attribute('href', link, 'xlink', xlinkNSRef))
if x<>None:
self.addAttribute(Attribute('x', x))
if y<>None:
self.addAttribute(Attribute('y', y))
if width<>None:
self.addAttribute(Attribute('width', width))
if height<>None:
self.addAttribute(Attribute('height', height))
class link(SVGelement):
"""a=link(url,**args)
a link is defined by a hyperlink. add elements which have to be linked
a.addElement(SVGelement)
"""
def __init__(self,link='',**args):
SVGelement.__init__(self,'a',**args)
self.addAttribute(Attribute('href', link, 'xlink', xlinkNSRef))
class view(SVGelement):
"""v=view(id,**args)
a view can be used to create a view with different attributes"""
def __init__(self,id=None,**args):
SVGelement.__init__(self,'view',**args)
if id<>None:
self.addAttribute(Attribute('id', id))
class script(SVGelement):
"""sc=script(type,type,cdata,**args)
adds a script element which contains CDATA to the SVG drawing
"""
def __init__(self,type,cdata=None,**args):
SVGelement.__init__(self,'script',{'type':type},cdata=cdata,**args)
class animate(SVGelement):
"""an=animate(attribute,from,to,during,**args)
animates an attribute.
"""
def __init__(self,attribute,fr=None,to=None,dur=None,**args):
SVGelement.__init__(self,'animate',{'attributeName':attribute},**args)
if fr<>None:
self.addAttribute(Attribute('from', fr))
if to<>None:
self.addAttribute(Attribute('to', to))
if dur<>None:
self.addAttribute(Attribute('dur', dur))
class animateMotion(SVGelement):
"""an=animateMotion(pathdata,dur,**args)
animates a SVGelement over the given path in dur seconds
"""
def __init__(self,pathdata,dur,**args):
SVGelement.__init__(self,'animateMotion',**args)
if pathdata<>None:
self.addAttribute(Attribute('path', str(pathdata)))
if dur<>None:
self.addAttribute(Attribute('dur', dur))
class animateTransform(SVGelement):
"""antr=animateTransform(type,from,to,dur,**args)
transform an element from and to a value.
"""
def __init__(self,type=None,fr=None,to=None,dur=None,**args):
SVGelement.__init__(self,'animateTransform',{'attributeName':'transform'},**args)
#As far as I know the attributeName is always transform
if type<>None:
self.addAttribute(Attribute('type', type))
if fr<>None:
self.addAttribute(Attribute('from', fr))
if to<>None:
self.addAttribute(Attribute('to', to))
if dur<>None:
self.addAttribute(Attribute('dur', dur))
class animateColor(SVGelement):
"""ac=animateColor(attribute,type,from,to,dur,**args)
Animates the color of a element
"""
def __init__(self,attribute,type=None,fr=None,to=None,dur=None,**args):
SVGelement.__init__(self,'animateColor',{'attributeName':attribute},**args)
if type<>None:
self.addAttribute(Attribute('type', type))
if fr<>None:
self.addAttribute(Attribute('from', fr))
if to<>None:
self.addAttribute(Attribute('to', to))
if dur<>None:
self.addAttribute(Attribute('dur', dur))
class set(SVGelement):
"""st=set(attribute,to,during,**args)
sets an attribute to a value for a
"""
def __init__(self,attribute,to=None,dur=None,**args):
SVGelement.__init__(self,'set',{'attributeName':attribute},**args)
if to<>None:
self.addAttribute(Attribute('to', to))
if dur<>None:
self.addAttribute(Attribute('dur', dur))
class svg(SVGelement):
"""s=svg(viewbox,width,height,**args)
a svg or element is the root of a drawing add all elements to a svg element.
You can have different svg elements in one svg file
s.addElement(SVGelement)
eg
d=drawing()
s=svg((0,0,100,100),'100%','100%')
c=circle(50,50,20)
s.addElement(c)
d.setSVG(s)
d.toXml()
"""
def __init__(self,viewBox=None, width=None, height=None,**args):
SVGelement.__init__(self,'svg',**args)
if viewBox<>None:
self.addAttribute(Attribute('viewBox', _viewboxlist(viewBox)))
if width<>None:
self.addAttribute(Attribute('width', width))
if height<>None:
self.addAttribute(Attribute('height', height_))
self.namespace="http://www.w3.org/2000/svg"
class drawing:
"""d=drawing()
this is the actual SVG document. It needs a svg element as a root.
Use the addSVG method to set the svg to the root. Use the toXml method to write the SVG
source to the screen or to a file
d=drawing()
d.addSVG(svg)
d.toXml(optionalfilename)
"""
def __init__(self):
self.svg=None
def setSVG(self,svg):
self.svg=svg
#Voeg een element toe aan de grafiek toe.
if use_dom_implementation==0:
def toXml(self, filename='',compress=False):
import cStringIO
xml=cStringIO.StringIO()
xml.write("<?xml version='1.0' encoding='UTF-8'?>\n")
xml.write("<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\" \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd \">\n")
self.svg.toXml(0,xml)
if not filename:
if compress:
import gzip
f=cStringIO.StringIO()
zf=gzip.GzipFile(fileobj=f,mode='wb')
zf.write(xml.getvalue())
zf.close()
f.seek(0)
return f.read()
else:
return xml.getvalue()
else:
if filename[-4:]=='svgz':
import gzip
f=gzip.GzipFile(filename=filename,mode="wb", compresslevel=9)
f.write(xml.getvalue())
f.close()
else:
f=file(filename,'w')
f.write(xml.getvalue())
f.close()
else:
def toXml(self,filename='',compress=False):
"""drawing.toXml() ---->to the screen
drawing.toXml(filename)---->to the file
writes a svg drawing to the screen or to a file
compresses if filename ends with svgz or if compress is true
"""
doctype = implementation.createDocumentType('svg',"-//W3C//DTD SVG 1.0//EN""",'http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd ')
global root
#root is defined global so it can be used by the appender. Its also possible to use it as an arugument but
#that is a bit messy.
root=implementation.createDocument(None,None,doctype)
#Create the xml document.
global appender
def appender(element,elementroot):
"""This recursive function appends elements to an element and sets the attributes
and type. It stops when alle elements have been appended"""
if element.namespace:
e=root.createElementNS(element.namespace,element.type)
else:
e=root.createElement(element.type)
if element.text:
textnode=root.createTextNode(element.text)
e.appendChild(textnode)
for attr in element.attributes.values(): #in element.attributes is supported from python 2.2
if attr.nsname and attr.nsref:
e.setAttributeNS(attr.nsref, attr.nsname+":"+attr.name, str(attr.value))
else:
e.setAttribute(attr.name,str(attr.value))
if element.elements:
for el in element.elements:
e=appender(el,e)
elementroot.appendChild(e)
return elementroot
root=appender(self.svg,root)
if not filename:
import cStringIO
xml=cStringIO.StringIO()
PrettyPrint(root,xml)
if compress:
import gzip
f=cStringIO.StringIO()
zf=gzip.GzipFile(fileobj=f,mode='wb')
zf.write(xml.getvalue())
zf.close()
f.seek(0)
return f.read()
else:
return xml.getvalue()
else:
try:
if filename[-4:]=='svgz':
import gzip
import cStringIO
xml=cStringIO.StringIO()
PrettyPrint(root,xml)
f=gzip.GzipFile(filename=filename,mode='wb',compresslevel=9)
f.write(xml.getvalue())
f.close()
else:
f=open(filename,'w')
PrettyPrint(root,f)
f.close()
except:
print "Cannot write SVG file: " + filename
def validate(self):
try:
import xml.parsers.xmlproc.xmlval
except:
raise exceptions.ImportError,'PyXml is required for validating SVG'
svg=self.toXml()
xv=xml.parsers.xmlproc.xmlval.XMLValidator()
try:
xv.feed(svg)
except:
raise "SVG is not well formed, see messages above"
else:
print "SVG well formed"
if __name__=='__main__':
d=drawing()
s=svg((0,0,100,100))
r=rect(-100,-100,300,300,'cyan')
s.addElement(r)
t=title('SVGdraw Demo')
s.addElement(t)
g=group('animations')
e=ellipse(0,0,5,2)
g.addElement(e)
c=circle(0,0,1,'red')
g.addElement(c)
pd=pathdata(0,-10)
for i in range(6):
pd.relsmbezier(10,5,0,10)
pd.relsmbezier(-10,5,0,10)
an=animateMotion(pd,10)
an.addAttribute(Attribute('rotate', 'auto-reverse'))
an.addAttribute(Attribute('repeatCount', "indefinite"))
g.addElement(an)
s.addElement(g)
for i in range(20,120,20):
u=use('#animations',i,0)
s.addElement(u)
for i in range(0,120,20):
for j in range(5,105,10):
c=circle(i,j,1,'red','black',.5)
s.addElement(c)
d.setSVG(s)
print d.toXml()
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