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svgfig.py
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# svgfig.py copyright (C) 2008 Jim Pivarski <jpivarski@gmail.com>
#
# This program 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 2
# of the License, or (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
# Full licence is in the file COPYING and at http://www.gnu.org/copyleft/gpl.html
import re, codecs, os, platform, copy, itertools, math, cmath, random, sys, copy
_epsilon = 1e-5
if re.search("windows", platform.system(), re.I):
try:
import _winreg
_default_directory = _winreg.QueryValueEx(_winreg.OpenKey(_winreg.HKEY_CURRENT_USER, \
r"Software\Microsoft\Windows\Current Version\Explorer\Shell Folders"), "Desktop")[0]
# tmpdir = _winreg.QueryValueEx(_winreg.OpenKey(_winreg.HKEY_CURRENT_USER, "Environment"), "TEMP")[0]
# if tmpdir[0:13] != "%USERPROFILE%":
# tmpdir = os.path.expanduser("~") + tmpdir[13:]
except:
_default_directory = os.path.expanduser("~") + os.sep + "Desktop"
_default_fileName = "tmp.svg"
_hacks = {}
_hacks["inkscape-text-vertical-shift"] = False
def rgb(r, g, b, maximum=1.):
"""Create an SVG color string "#xxyyzz" from r, g, and b.
r,g,b = 0 is black and r,g,b = maximum is white.
"""
return "#%02x%02x%02x" % (max(0, min(r*255./maximum, 255)), max(0, min(g*255./maximum, 255)), max(0, min(b*255./maximum, 255)))
def attr_preprocess(attr):
for name in attr.keys():
name_colon = re.sub("__", ":", name)
if name_colon != name:
attr[name_colon] = attr[name]
del attr[name]
name = name_colon
name_dash = re.sub("_", "-", name)
if name_dash != name:
attr[name_dash] = attr[name]
del attr[name]
name = name_dash
return attr
class SVG:
"""A tree representation of an SVG image or image fragment.
SVG(t, sub, sub, sub..., attribute=value)
t required SVG type name
sub optional list nested SVG elements or text/Unicode
attribute=value pairs optional keywords SVG attributes
In attribute names, "__" becomes ":" and "_" becomes "-".
SVG in XML
<g id="mygroup" fill="blue">
<rect x="1" y="1" width="2" height="2" />
<rect x="3" y="3" width="2" height="2" />
</g>
SVG in Python
>>> svg = SVG("g", SVG("rect", x=1, y=1, width=2, height=2), \
... SVG("rect", x=3, y=3, width=2, height=2), \
... id="mygroup", fill="blue")
Sub-elements and attributes may be accessed through tree-indexing:
>>> svg = SVG("text", SVG("tspan", "hello there"), stroke="none", fill="black")
>>> svg[0]
<tspan (1 sub) />
>>> svg[0, 0]
'hello there'
>>> svg["fill"]
'black'
Iteration is depth-first:
>>> svg = SVG("g", SVG("g", SVG("line", x1=0, y1=0, x2=1, y2=1)), \
... SVG("text", SVG("tspan", "hello again")))
...
>>> for ti, s in svg:
... print ti, repr(s)
...
(0,) <g (1 sub) />
(0, 0) <line x2=1 y1=0 x1=0 y2=1 />
(0, 0, 'x2') 1
(0, 0, 'y1') 0
(0, 0, 'x1') 0
(0, 0, 'y2') 1
(1,) <text (1 sub) />
(1, 0) <tspan (1 sub) />
(1, 0, 0) 'hello again'
Use "print" to navigate:
>>> print svg
None <g (2 sub) />
[0] <g (1 sub) />
[0, 0] <line x2=1 y1=0 x1=0 y2=1 />
[1] <text (1 sub) />
[1, 0] <tspan (1 sub) />
"""
def __init__(self, *t_sub, **attr):
if len(t_sub) == 0: raise TypeError, "SVG element must have a t (SVG type)"
# first argument is t (SVG type)
self.t = t_sub[0]
# the rest are sub-elements
self.sub = list(t_sub[1:])
# keyword arguments are attributes
# need to preprocess to handle differences between SVG and Python syntax
self.attr = attr_preprocess(attr)
def __getitem__(self, ti):
"""Index is a list that descends tree, returning a sub-element if
it ends with a number and an attribute if it ends with a string."""
obj = self
if isinstance(ti, (list, tuple)):
for i in ti[:-1]: obj = obj[i]
ti = ti[-1]
if isinstance(ti, (int, long, slice)): return obj.sub[ti]
else: return obj.attr[ti]
def __setitem__(self, ti, value):
"""Index is a list that descends tree, returning a sub-element if
it ends with a number and an attribute if it ends with a string."""
obj = self
if isinstance(ti, (list, tuple)):
for i in ti[:-1]: obj = obj[i]
ti = ti[-1]
if isinstance(ti, (int, long, slice)): obj.sub[ti] = value
else: obj.attr[ti] = value
def __delitem__(self, ti):
"""Index is a list that descends tree, returning a sub-element if
it ends with a number and an attribute if it ends with a string."""
obj = self
if isinstance(ti, (list, tuple)):
for i in ti[:-1]: obj = obj[i]
ti = ti[-1]
if isinstance(ti, (int, long, slice)): del obj.sub[ti]
else: del obj.attr[ti]
def __contains__(self, value):
"""x in svg == True iff x is an attribute in svg."""
return value in self.attr
def __eq__(self, other):
"""x == y iff x represents the same SVG as y."""
if id(self) == id(other): return True
return isinstance(other, SVG) and self.t == other.t and self.sub == other.sub and self.attr == other.attr
def __ne__(self, other):
"""x != y iff x does not represent the same SVG as y."""
return not (self == other)
def append(self, x):
"""Appends x to the list of sub-elements (drawn last, overlaps
other primatives)."""
self.sub.append(x)
def prepend(self, x):
"""Prepends x to the list of sub-elements (drawn first may be
overlapped by other primatives)."""
self.sub[0:0] = [x]
def extend(self, x):
"""Extends list of sub-elements by a list x."""
self.sub.extend(x)
def clone(self, shallow=False):
"""Deep copy of SVG tree. Set shallow=True for a shallow copy."""
if shallow:
return copy.copy(self)
else:
return copy.deepcopy(self)
### nested class
class SVGDepthIterator:
"""Manages SVG iteration."""
def __init__(self, svg, ti, depth_limit):
self.svg = svg
self.ti = ti
self.shown = False
self.depth_limit = depth_limit
def __iter__(self): return self
def next(self):
if not self.shown:
self.shown = True
if self.ti != ():
return self.ti, self.svg
if not isinstance(self.svg, SVG): raise StopIteration
if self.depth_limit != None and len(self.ti) >= self.depth_limit: raise StopIteration
if "iterators" not in self.__dict__:
self.iterators = []
for i, s in enumerate(self.svg.sub):
self.iterators.append(self.__class__(s, self.ti + (i,), self.depth_limit))
for k, s in self.svg.attr.items():
self.iterators.append(self.__class__(s, self.ti + (k,), self.depth_limit))
self.iterators = itertools.chain(*self.iterators)
return self.iterators.next()
### end nested class
def depth_first(self, depth_limit=None):
"""Returns a depth-first generator over the SVG. If depth_limit
is a number, stop recursion at that depth."""
return self.SVGDepthIterator(self, (), depth_limit)
def breadth_first(self, depth_limit=None):
"""Not implemented yet. Any ideas on how to do it?
Returns a breadth-first generator over the SVG. If depth_limit
is a number, stop recursion at that depth."""
raise NotImplementedError, "Got an algorithm for breadth-first searching a tree without effectively copying the tree?"
def __iter__(self): return self.depth_first()
def items(self, sub=True, attr=True, text=True):
"""Get a recursively-generated list of tree-index, sub-element/attribute pairs.
If sub == False, do not show sub-elements.
If attr == False, do not show attributes.
If text == False, do not show text/Unicode sub-elements.
"""
output = []
for ti, s in self:
show = False
if isinstance(ti[-1], (int, long)):
if isinstance(s, basestring): show = text
else: show = sub
else: show = attr
if show: output.append((ti, s))
return output
def keys(self, sub=True, attr=True, text=True):
"""Get a recursively-generated list of tree-indexes.
If sub == False, do not show sub-elements.
If attr == False, do not show attributes.
If text == False, do not show text/Unicode sub-elements.
"""
return [ti for ti, s in self.items(sub, attr, text)]
def values(self, sub=True, attr=True, text=True):
"""Get a recursively-generated list of sub-elements and attributes.
If sub == False, do not show sub-elements.
If attr == False, do not show attributes.
If text == False, do not show text/Unicode sub-elements.
"""
return [s for ti, s in self.items(sub, attr, text)]
def __repr__(self): return self.xml(depth_limit=0)
def __str__(self):
"""Print (actually, return a string of) the tree in a form useful for browsing."""
return self.tree(sub=True, attr=False, text=False)
def tree(self, depth_limit=None, sub=True, attr=True, text=True, tree_width=20, obj_width=80):
"""Print (actually, return a string of) the tree in a form useful for browsing.
If depth_limit == a number, stop recursion at that depth.
If sub == False, do not show sub-elements.
If attr == False, do not show attributes.
If text == False, do not show text/Unicode sub-elements.
tree_width is the number of characters reserved for printing tree indexes.
obj_width is the number of characters reserved for printing sub-elements/attributes.
"""
output = []
line = "%s %s" % (("%%-%ds" % tree_width) % repr(None), ("%%-%ds" % obj_width) % (repr(self))[0:obj_width])
output.append(line)
for ti, s in self.depth_first(depth_limit):
show = False
if isinstance(ti[-1], (int, long)):
if isinstance(s, basestring): show = text
else: show = sub
else: show = attr
if show:
line = "%s %s" % (("%%-%ds" % tree_width) % repr(list(ti)), ("%%-%ds" % obj_width) % (" "*len(ti) + repr(s))[0:obj_width])
output.append(line)
return "\n".join(output)
def xml(self, indent=" ", newl="\n", depth_limit=None, depth=0):
"""Get an XML representation of the SVG.
indent string used for indenting
newl string used for newlines
If depth_limit == a number, stop recursion at that depth.
depth starting depth (not useful for users)
print svg.xml()
"""
attrstr = []
for n, v in self.attr.items():
if isinstance(v, dict):
v = "; ".join(["%s:%s" % (ni, vi) for ni, vi in v.items()])
elif isinstance(v, (list, tuple)):
v = ", ".join(v)
attrstr.append(" %s=%s" % (n, repr(v)))
attrstr = "".join(attrstr)
if len(self.sub) == 0: return "%s<%s%s />" % (indent * depth, self.t, attrstr)
if depth_limit == None or depth_limit > depth:
substr = []
for s in self.sub:
if isinstance(s, SVG):
substr.append(s.xml(indent, newl, depth_limit, depth + 1) + newl)
elif isinstance(s, str):
substr.append("%s%s%s" % (indent * (depth + 1), s, newl))
else:
substr.append("%s%s%s" % (indent * (depth + 1), repr(s), newl))
substr = "".join(substr)
return "%s<%s%s>%s%s%s</%s>" % (indent * depth, self.t, attrstr, newl, substr, indent * depth, self.t)
else:
return "%s<%s (%d sub)%s />" % (indent * depth, self.t, len(self.sub), attrstr)
def standalone_xml(self, indent=" ", newl="\n"):
"""Get an XML representation of the SVG that can be saved/rendered.
indent string used for indenting
newl string used for newlines
"""
if self.t == "svg": top = self
else: top = canvas(self)
return """\
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
""" + ("".join(top.__standalone_xml(indent, newl))) # end of return statement
def __standalone_xml(self, indent, newl):
output = [u"<%s" % self.t]
for n, v in self.attr.items():
if isinstance(v, dict):
v = "; ".join(["%s:%s" % (ni, vi) for ni, vi in v.items()])
elif isinstance(v, (list, tuple)):
v = ", ".join(v)
output.append(u" %s=\"%s\"" % (n, v))
if len(self.sub) == 0:
output.append(u" />%s%s" % (newl, newl))
return output
elif self.t == "text" or self.t == "tspan" or self.t == "style":
output.append(u">")
else:
output.append(u">%s%s" % (newl, newl))
for s in self.sub:
if isinstance(s, SVG): output.extend(s.__standalone_xml(indent, newl))
else: output.append(unicode(s))
if self.t == "tspan": output.append(u"</%s>" % self.t)
else: output.append(u"</%s>%s%s" % (self.t, newl, newl))
return output
def interpret_fileName(self, fileName=None):
if fileName == None:
fileName = _default_fileName
if re.search("windows", platform.system(), re.I) and not os.path.isabs(fileName):
fileName = _default_directory + os.sep + fileName
return fileName
def save(self, fileName=None, encoding="utf-8", compresslevel=None):
"""Save to a file for viewing. Note that svg.save() overwrites the file named _default_fileName.
fileName default=None note that _default_fileName will be overwritten if
no fileName is specified. If the extension
is ".svgz" or ".gz", the output will be gzipped
encoding default="utf-8" file encoding (default is Unicode)
compresslevel default=None if a number, the output will be gzipped with that
compression level (1-9, 1 being fastest and 9 most
thorough)
"""
fileName = self.interpret_fileName(fileName)
if compresslevel != None or re.search("\.svgz$", fileName, re.I) or re.search("\.gz$", fileName, re.I):
import gzip
if compresslevel == None:
f = gzip.GzipFile(fileName, "w")
else:
f = gzip.GzipFile(fileName, "w", compresslevel)
f = codecs.EncodedFile(f, "utf-8", encoding)
f.write(self.standalone_xml())
f.close()
else:
f = codecs.open(fileName, "w", encoding=encoding)
f.write(self.standalone_xml())
f.close()
def inkview(self, fileName=None, encoding="utf-8"):
"""View in "inkview", assuming that program is available on your system.
fileName default=None note that any file named _default_fileName will be
overwritten if no fileName is specified. If the extension
is ".svgz" or ".gz", the output will be gzipped
encoding default="utf-8" file encoding (default is Unicode)
"""
fileName = self.interpret_fileName(fileName)
self.save(fileName, encoding)
os.spawnvp(os.P_NOWAIT, "inkview", ("inkview", fileName))
def inkscape(self, fileName=None, encoding="utf-8"):
"""View in "inkscape", assuming that program is available on your system.
fileName default=None note that any file named _default_fileName will be
overwritten if no fileName is specified. If the extension
is ".svgz" or ".gz", the output will be gzipped
encoding default="utf-8" file encoding (default is Unicode)
"""
fileName = self.interpret_fileName(fileName)
self.save(fileName, encoding)
os.spawnvp(os.P_NOWAIT, "inkscape", ("inkscape", fileName))
def firefox(self, fileName=None, encoding="utf-8"):
"""View in "firefox", assuming that program is available on your system.
fileName default=None note that any file named _default_fileName will be
overwritten if no fileName is specified. If the extension
is ".svgz" or ".gz", the output will be gzipped
encoding default="utf-8" file encoding (default is Unicode)
"""
fileName = self.interpret_fileName(fileName)
self.save(fileName, encoding)
os.spawnvp(os.P_NOWAIT, "firefox", ("firefox", fileName))
######################################################################
_canvas_defaults = {"width": "400px", "height": "400px", "viewBox": "0 0 100 100", \
"xmlns": "http://www.w3.org/2000/svg", "xmlns:xlink": "http://www.w3.org/1999/xlink", "version":"1.1", \
"style": {"stroke":"black", "fill":"none", "stroke-width":"0.5pt", "stroke-linejoin":"round", "text-anchor":"middle"}, \
"font-family": ["Helvetica", "Arial", "FreeSans", "Sans", "sans", "sans-serif"], \
}
def canvas(*sub, **attr):
"""Creates a top-level SVG object, allowing the user to control the
image size and aspect ratio.
canvas(sub, sub, sub..., attribute=value)
sub optional list nested SVG elements or text/Unicode
attribute=value pairs optional keywords SVG attributes
Default attribute values:
width "400px"
height "400px"
viewBox "0 0 100 100"
xmlns "http://www.w3.org/2000/svg"
xmlns:xlink "http://www.w3.org/1999/xlink"
version "1.1"
style "stroke:black; fill:none; stroke-width:0.5pt; stroke-linejoin:round; text-anchor:middle"
font-family "Helvetica,Arial,FreeSans?,Sans,sans,sans-serif"
"""
attributes = dict(_canvas_defaults)
attributes.update(attr)
if sub == None or sub == ():
return SVG("svg", **attributes)
else:
return SVG("svg", *sub, **attributes)
def canvas_outline(*sub, **attr):
"""Same as canvas(), but draws an outline around the drawable area,
so that you know how close your image is to the edges."""
svg = canvas(*sub, **attr)
match = re.match("[, \t]*([0-9e.+\-]+)[, \t]+([0-9e.+\-]+)[, \t]+([0-9e.+\-]+)[, \t]+([0-9e.+\-]+)[, \t]*", svg["viewBox"])
if match == None: raise ValueError, "canvas viewBox is incorrectly formatted"
x, y, width, height = [float(x) for x in match.groups()]
svg.prepend(SVG("rect", x=x, y=y, width=width, height=height, stroke="none", fill="cornsilk"))
svg.append(SVG("rect", x=x, y=y, width=width, height=height, stroke="black", fill="none"))
return svg
def template(fileName, svg, replaceme="REPLACEME"):
"""Loads an SVG image from a file, replacing instances of
<REPLACEME /> with a given svg object.
fileName required name of the template SVG
svg required SVG object for replacement
replaceme default="REPLACEME" fake SVG element to be replaced by the given object
>>> print load("template.svg")
None <svg (2 sub) style=u'stroke:black; fill:none; stroke-width:0.5pt; stroke-linejoi
[0] <rect height=u'100' width=u'100' stroke=u'none' y=u'0' x=u'0' fill=u'yellow'
[1] <REPLACEME />
>>>
>>> print template("template.svg", SVG("circle", cx=50, cy=50, r=30))
None <svg (2 sub) style=u'stroke:black; fill:none; stroke-width:0.5pt; stroke-linejoi
[0] <rect height=u'100' width=u'100' stroke=u'none' y=u'0' x=u'0' fill=u'yellow'
[1] <circle cy=50 cx=50 r=30 />
"""
output = load(fileName)
for ti, s in output:
if isinstance(s, SVG) and s.t == replaceme:
output[ti] = svg
return output
######################################################################
def load(fileName):
"""Loads an SVG image from a file."""
return load_stream(file(fileName))
def load_stream(stream):
"""Loads an SVG image from a stream (can be a string or a file object)."""
from xml.sax import handler, make_parser
from xml.sax.handler import feature_namespaces, feature_external_ges, feature_external_pes
class ContentHandler(handler.ContentHandler):
def __init__(self):
self.stack = []
self.output = None
self.all_whitespace = re.compile("^\s*$")
def startElement(self, name, attr):
s = SVG(name)
s.attr = dict(attr.items())
if len(self.stack) > 0:
last = self.stack[-1]
last.sub.append(s)
self.stack.append(s)
def characters(self, ch):
if not isinstance(ch, basestring) or self.all_whitespace.match(ch) == None:
if len(self.stack) > 0:
last = self.stack[-1]
if len(last.sub) > 0 and isinstance(last.sub[-1], basestring):
last.sub[-1] = last.sub[-1] + "\n" + ch
else:
last.sub.append(ch)
def endElement(self, name):
if len(self.stack) > 0:
last = self.stack[-1]
if isinstance(last, SVG) and last.t == "style" and "type" in last.attr and last.attr["type"] == "text/css" and len(last.sub) == 1 and isinstance(last.sub[0], basestring):
last.sub[0] = "<![CDATA[\n" + last.sub[0] + "]]>"
self.output = self.stack.pop()
ch = ContentHandler()
parser = make_parser()
parser.setContentHandler(ch)
parser.setFeature(feature_namespaces, 0)
parser.setFeature(feature_external_ges, 0)
parser.parse(stream)
return ch.output
######################################################################
def totrans(expr, vars=("x", "y"), globals=None, locals=None):
"""Converts to a coordinate transformation (a function that accepts
two arguments and returns two values).
expr required a string expression or a function
of two real or one complex value
vars default=("x", "y") independent variable names;
a singleton ("z",) is interpreted
as complex
globals default=None dict of global variables
locals default=None dict of local variables
"""
if callable(expr):
if expr.func_code.co_argcount == 2:
return expr
elif expr.func_code.co_argcount == 1:
split = lambda z: (z.real, z.imag)
output = lambda x, y: split(expr(x + y*1j))
output.func_name = expr.func_name
return output
else:
raise TypeError, "must be a function of 2 or 1 variables"
if len(vars) == 2:
g = math.__dict__
if globals != None: g.update(globals)
output = eval("lambda %s, %s: (%s)" % (vars[0], vars[1], expr), g, locals)
output.func_name = "%s,%s -> %s" % (vars[0], vars[1], expr)
return output
elif len(vars) == 1:
g = cmath.__dict__
if globals != None: g.update(globals)
output = eval("lambda %s: (%s)" % (vars[0], expr), g, locals)
split = lambda z: (z.real, z.imag)
output2 = lambda x, y: split(output(x + y*1j))
output2.func_name = "%s -> %s" % (vars[0], expr)
return output2
else:
raise TypeError, "vars must have 2 or 1 elements"
def window(xmin, xmax, ymin, ymax, x=0, y=0, width=100, height=100, xlogbase=None, ylogbase=None, minusInfinity=-1000, flipx=False, flipy=True):
"""Creates and returns a coordinate transformation (a function that
accepts two arguments and returns two values) that transforms from
(xmin, ymin), (xmax, ymax)
to
(x, y), (x + width, y + height).
xlogbase, ylogbase default=None, None if a number, transform
logarithmically with given base
minusInfinity default=-1000 what to return if
log(0 or negative) is attempted
flipx default=False if true, reverse the direction of x
flipy default=True if true, reverse the direction of y
(When composing windows, be sure to set flipy=False.)
"""
if flipx:
ox1 = x + width
ox2 = x
else:
ox1 = x
ox2 = x + width
if flipy:
oy1 = y + height
oy2 = y
else:
oy1 = y
oy2 = y + height
ix1 = xmin
iy1 = ymin
ix2 = xmax
iy2 = ymax
if xlogbase != None and (ix1 <= 0. or ix2 <= 0.): raise ValueError, "x range incompatible with log scaling: (%g, %g)" % (ix1, ix2)
if ylogbase != None and (iy1 <= 0. or iy2 <= 0.): raise ValueError, "y range incompatible with log scaling: (%g, %g)" % (iy1, iy2)
def maybelog(t, it1, it2, ot1, ot2, logbase):
if t <= 0.: return minusInfinity
else:
return ot1 + 1.*(math.log(t, logbase) - math.log(it1, logbase))/(math.log(it2, logbase) - math.log(it1, logbase)) * (ot2 - ot1)
xlogstr, ylogstr = "", ""
if xlogbase == None:
xfunc = lambda x: ox1 + 1.*(x - ix1)/(ix2 - ix1) * (ox2 - ox1)
else:
xfunc = lambda x: maybelog(x, ix1, ix2, ox1, ox2, xlogbase)
xlogstr = " xlog=%g" % xlogbase
if ylogbase == None:
yfunc = lambda y: oy1 + 1.*(y - iy1)/(iy2 - iy1) * (oy2 - oy1)
else:
yfunc = lambda y: maybelog(y, ylogbase)
ylogstr = " ylog=%g" % ylogbase
output = lambda x, y: (xfunc(x), yfunc(y))
output.func_name = "(%g, %g), (%g, %g) -> (%g, %g), (%g, %g)%s%s" % (ix1, ix2, iy1, iy2, ox1, ox2, oy1, oy2, xlogstr, ylogstr)
return output
def rotate(angle, cx=0, cy=0):
"""Creates and returns a coordinate transformation which rotates
around (cx,cy) by "angle" degrees."""
angle *= math.pi/180.
return lambda x, y: (cx + math.cos(angle)*(x - cx) - math.sin(angle)*(y - cy), cy + math.sin(angle)*(x - cx) + math.cos(angle)*(y - cy))
class Fig:
"""Stores graphics primitive objects and applies a single coordinate
transformation to them. To compose coordinate systems, nest Fig
objects.
Fig(obj, obj, obj..., trans=function)
obj optional list a list of drawing primatives
trans default=None a coordinate transformation function
>>> fig = Fig(Line(0,0,1,1), Rect(0.2,0.2,0.8,0.8), trans="2*x, 2*y")
>>> print fig.SVG().xml()
<g>
<path d='M0 0L2 2' />
<path d='M0.4 0.4L1.6 0.4ZL1.6 1.6ZL0.4 1.6ZL0.4 0.4ZZ' />
</g>
>>> print Fig(fig, trans="x/2., y/2.").SVG().xml()
<g>
<path d='M0 0L1 1' />
<path d='M0.2 0.2L0.8 0.2ZL0.8 0.8ZL0.2 0.8ZL0.2 0.2ZZ' />
</g>
"""
def __repr__(self):
if self.trans == None:
return "<Fig (%d items)>" % len(self.d)
elif isinstance(self.trans, basestring):
return "<Fig (%d items) x,y -> %s>" % (len(self.d), self.trans)
else:
return "<Fig (%d items) %s>" % (len(self.d), self.trans.func_name)
def __init__(self, *d, **kwds):
self.d = list(d)
defaults = {"trans":None}
defaults.update(kwds)
kwds = defaults
self.trans = kwds["trans"]; del kwds["trans"]
if len(kwds) != 0:
raise TypeError, "Fig() got unexpected keyword arguments %s" % kwds.keys()
def SVG(self, trans=None):
"""Apply the transformation "trans" and return an SVG object.
Coordinate transformations in nested Figs will be composed.
"""
if trans == None: trans = self.trans
if isinstance(trans, basestring): trans = totrans(trans)
output = SVG("g")
for s in self.d:
if isinstance(s, SVG):
output.append(s)
elif isinstance(s, Fig):
strans = s.trans
if isinstance(strans, basestring): strans = totrans(strans)
if trans == None: subtrans = strans
elif strans == None: subtrans = trans
else: subtrans = lambda x,y: trans(*strans(x, y))
output.sub += s.SVG(subtrans).sub
elif s == None: pass
else:
output.append(s.SVG(trans))
return output
class Plot:
"""Acts like Fig, but draws a coordinate axis. You also need to supply plot ranges.
Plot(xmin, xmax, ymin, ymax, obj, obj, obj..., keyword options...)
xmin, xmax required minimum and maximum x values (in the objs' coordinates)
ymin, ymax required minimum and maximum y values (in the objs' coordinates)
obj optional list drawing primatives
keyword options keyword list options defined below
The following are keyword options, with their default values:
trans None transformation function
x, y 5, 5 upper-left corner of the Plot in SVG coordinates
width, height 90, 90 width and height of the Plot in SVG coordinates
flipx, flipy False, True flip the sign of the coordinate axis
minusInfinity -1000 if an axis is logarithmic and an object is plotted at 0 or
a negative value, -1000 will be used as a stand-in for NaN
atx, aty 0, 0 the place where the coordinate axes cross
xticks -10 request ticks according to the standard tick specification
(see help(Ticks))
xminiticks True request miniticks according to the standard minitick
specification
xlabels True request tick labels according to the standard tick label
specification
xlogbase None if a number, the axis and transformation are logarithmic
with ticks at the given base (10 being the most common)
(same for y)
arrows None if a new identifier, create arrow markers and draw them
at the ends of the coordinate axes
text_attr {} a dictionary of attributes for label text
axis_attr {} a dictionary of attributes for the axis lines
"""
def __repr__(self):
if self.trans == None:
return "<Plot (%d items)>" % len(self.d)
else:
return "<Plot (%d items) %s>" % (len(self.d), self.trans.func_name)
def __init__(self, xmin, xmax, ymin, ymax, *d, **kwds):
self.xmin, self.xmax, self.ymin, self.ymax = xmin, xmax, ymin, ymax
self.d = list(d)
defaults = {"trans":None, "x":5, "y":5, "width":90, "height":90, "flipx":False, "flipy":True, "minusInfinity":-1000, \
"atx":0, "xticks":-10, "xminiticks":True, "xlabels":True, "xlogbase":None, \
"aty":0, "yticks":-10, "yminiticks":True, "ylabels":True, "ylogbase":None, \
"arrows":None, "text_attr":{}, "axis_attr":{}}
defaults.update(kwds)
kwds = defaults
self.trans = kwds["trans"]; del kwds["trans"]
self.x = kwds["x"]; del kwds["x"]
self.y = kwds["y"]; del kwds["y"]
self.width = kwds["width"]; del kwds["width"]
self.height = kwds["height"]; del kwds["height"]
self.flipx = kwds["flipx"]; del kwds["flipx"]
self.flipy = kwds["flipy"]; del kwds["flipy"]
self.minusInfinity = kwds["minusInfinity"]; del kwds["minusInfinity"]
self.atx = kwds["atx"]; del kwds["atx"]
self.xticks = kwds["xticks"]; del kwds["xticks"]
self.xminiticks = kwds["xminiticks"]; del kwds["xminiticks"]
self.xlabels = kwds["xlabels"]; del kwds["xlabels"]
self.xlogbase = kwds["xlogbase"]; del kwds["xlogbase"]
self.aty = kwds["aty"]; del kwds["aty"]
self.yticks = kwds["yticks"]; del kwds["yticks"]
self.yminiticks = kwds["yminiticks"]; del kwds["yminiticks"]
self.ylabels = kwds["ylabels"]; del kwds["ylabels"]
self.ylogbase = kwds["ylogbase"]; del kwds["ylogbase"]
self.arrows = kwds["arrows"]; del kwds["arrows"]
self.text_attr = kwds["text_attr"]; del kwds["text_attr"]
self.axis_attr = kwds["axis_attr"]; del kwds["axis_attr"]
if len(kwds) != 0:
raise TypeError, "Plot() got unexpected keyword arguments %s" % kwds.keys()
def SVG(self, trans=None):
"""Apply the transformation "trans" and return an SVG object."""
if trans == None: trans = self.trans
if isinstance(trans, basestring): trans = totrans(trans)
self.last_window = window(self.xmin, self.xmax, self.ymin, self.ymax, x=self.x, y=self.y, width=self.width, height=self.height, \
xlogbase=self.xlogbase, ylogbase=self.ylogbase, minusInfinity=self.minusInfinity, flipx=self.flipx, flipy=self.flipy)
d = [Axes(self.xmin, self.xmax, self.ymin, self.ymax, self.atx, self.aty, \
self.xticks, self.xminiticks, self.xlabels, self.xlogbase, \
self.yticks, self.yminiticks, self.ylabels, self.ylogbase, \
self.arrows, self.text_attr, **self.axis_attr)] \
+ self.d
return Fig(Fig(*d, **{"trans":trans})).SVG(self.last_window)
class Frame:
text_defaults = {"stroke":"none", "fill":"black", "font-size":5}
axis_defaults = {}
tick_length = 1.5
minitick_length = 0.75
text_xaxis_offset = 1.
text_yaxis_offset = 2.
text_xtitle_offset = 6.
text_ytitle_offset = 12.
def __repr__(self):
return "<Frame (%d items)>" % len(self.d)
def __init__(self, xmin, xmax, ymin, ymax, *d, **kwds):
"""Acts like Fig, but draws a coordinate frame around the data. You also need to supply plot ranges.
Frame(xmin, xmax, ymin, ymax, obj, obj, obj..., keyword options...)
xmin, xmax required minimum and maximum x values (in the objs' coordinates)
ymin, ymax required minimum and maximum y values (in the objs' coordinates)
obj optional list drawing primatives
keyword options keyword list options defined below
The following are keyword options, with their default values:
x, y 20, 5 upper-left corner of the Frame in SVG coordinates
width, height 75, 80 width and height of the Frame in SVG coordinates
flipx, flipy False, True flip the sign of the coordinate axis
minusInfinity -1000 if an axis is logarithmic and an object is plotted at 0 or
a negative value, -1000 will be used as a stand-in for NaN
xtitle None if a string, label the x axis
xticks -10 request ticks according to the standard tick specification
(see help(Ticks))
xminiticks True request miniticks according to the standard minitick
specification
xlabels True request tick labels according to the standard tick label
specification
xlogbase None if a number, the axis and transformation are logarithmic
with ticks at the given base (10 being the most common)
(same for y)
text_attr {} a dictionary of attributes for label text
axis_attr {} a dictionary of attributes for the axis lines
"""
self.xmin, self.xmax, self.ymin, self.ymax = xmin, xmax, ymin, ymax
self.d = list(d)
defaults = {"x":20, "y":5, "width":75, "height":80, "flipx":False, "flipy":True, "minusInfinity":-1000, \
"xtitle":None, "xticks":-10, "xminiticks":True, "xlabels":True, "x2labels":None, "xlogbase":None, \
"ytitle":None, "yticks":-10, "yminiticks":True, "ylabels":True, "y2labels":None, "ylogbase":None, \
"text_attr":{}, "axis_attr":{}}
defaults.update(kwds)
kwds = defaults
self.x = kwds["x"]; del kwds["x"]
self.y = kwds["y"]; del kwds["y"]
self.width = kwds["width"]; del kwds["width"]
self.height = kwds["height"]; del kwds["height"]
self.flipx = kwds["flipx"]; del kwds["flipx"]
self.flipy = kwds["flipy"]; del kwds["flipy"]
self.minusInfinity = kwds["minusInfinity"]; del kwds["minusInfinity"]
self.xtitle = kwds["xtitle"]; del kwds["xtitle"]
self.xticks = kwds["xticks"]; del kwds["xticks"]
self.xminiticks = kwds["xminiticks"]; del kwds["xminiticks"]
self.xlabels = kwds["xlabels"]; del kwds["xlabels"]
self.x2labels = kwds["x2labels"]; del kwds["x2labels"]
self.xlogbase = kwds["xlogbase"]; del kwds["xlogbase"]
self.ytitle = kwds["ytitle"]; del kwds["ytitle"]
self.yticks = kwds["yticks"]; del kwds["yticks"]
self.yminiticks = kwds["yminiticks"]; del kwds["yminiticks"]
self.ylabels = kwds["ylabels"]; del kwds["ylabels"]
self.y2labels = kwds["y2labels"]; del kwds["y2labels"]
self.ylogbase = kwds["ylogbase"]; del kwds["ylogbase"]
self.text_attr = dict(self.text_defaults)
self.text_attr.update(kwds["text_attr"]); del kwds["text_attr"]
self.axis_attr = dict(self.axis_defaults)
self.axis_attr.update(kwds["axis_attr"]); del kwds["axis_attr"]
if len(kwds) != 0:
raise TypeError, "Frame() got unexpected keyword arguments %s" % kwds.keys()
def SVG(self):
"""Apply the window transformation and return an SVG object."""
self.last_window = window(self.xmin, self.xmax, self.ymin, self.ymax, x=self.x, y=self.y, width=self.width, height=self.height, \
xlogbase=self.xlogbase, ylogbase=self.ylogbase, minusInfinity=self.minusInfinity, flipx=self.flipx, flipy=self.flipy)
left = YAxis(self.ymin, self.ymax, self.xmin, self.yticks, self.yminiticks, self.ylabels, self.ylogbase, None, None, None, self.text_attr, **self.axis_attr)
right = YAxis(self.ymin, self.ymax, self.xmax, self.yticks, self.yminiticks, self.y2labels, self.ylogbase, None, None, None, self.text_attr, **self.axis_attr)
bottom = XAxis(self.xmin, self.xmax, self.ymin, self.xticks, self.xminiticks, self.xlabels, self.xlogbase, None, None, None, self.text_attr, **self.axis_attr)
top = XAxis(self.xmin, self.xmax, self.ymax, self.xticks, self.xminiticks, self.x2labels, self.xlogbase, None, None, None, self.text_attr, **self.axis_attr)
left.tick_start = -self.tick_length
left.tick_end = 0
left.minitick_start = -self.minitick_length
left.minitick_end = 0.
left.text_start = self.text_yaxis_offset
right.tick_start = 0.
right.tick_end = self.tick_length
right.minitick_start = 0.
right.minitick_end = self.minitick_length
right.text_start = -self.text_yaxis_offset
right.text_attr["text-anchor"] = "start"
bottom.tick_start = 0.
bottom.tick_end = self.tick_length
bottom.minitick_start = 0.
bottom.minitick_end = self.minitick_length
bottom.text_start = -self.text_xaxis_offset
top.tick_start = -self.tick_length
top.tick_end = 0.
top.minitick_start = -self.minitick_length
top.minitick_end = 0.
top.text_start = self.text_xaxis_offset
top.text_attr["dominant-baseline"] = "text-after-edge"
output = Fig(*self.d).SVG(self.last_window)
output.prepend(left.SVG(self.last_window))
output.prepend(bottom.SVG(self.last_window))
output.prepend(right.SVG(self.last_window))
output.prepend(top.SVG(self.last_window))
if self.xtitle != None:
output.append(SVG("text", self.xtitle, transform="translate(%g, %g)" % ((self.x + self.width/2.), (self.y + self.height + self.text_xtitle_offset)), dominant_baseline="text-before-edge", **self.text_attr))
if self.ytitle != None: