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#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
# Thanks for using Enthought open source!
#------------------------------------------------------------------------------
""" Chaco's SVG backend
:Copyright: ActiveState
:License: BSD Style
:Author: David Ascher (davida@activestate.com)
:Version: $Revision: 1.5 $
"""
####
#
# Known limitations
#
# * BUG: Weird behavior with compound plots
# * Limitation: text widths are lousy if reportlab is not installed
# * Missing feature: rotated text
"""
Miscellaneous notes:
* the way to do links:
<a xlink:href="http://www.w3.org">
<ellipse cx="2.5" cy="1.5" rx="2" ry="1" fill="red" />
</a>
"""
# Major library imports
import os
import sys
import cStringIO
from numpy import arange, ravel, pi
# Local, relative Kiva imports
import affine
import basecore2d
import constants
from constants import FILL, FILL_STROKE, EOF_FILL_STROKE, EOF_FILL, STROKE
def _strpoints(points):
c = cStringIO.StringIO()
for x,y in points:
c.write('%3.2f,%3.2f ' % (x,y))
return c.getvalue()
def _mkstyle(kw):
return '"' + '; '.join([str(k) + ':' + str(v) for k,v in kw.items()]) +'"'
def default_filter(kw1):
kw = {}
for (k,v) in kw1.items():
if type(v) == type(()):
if v[0] != v[1]:
kw[k] = v[0]
else:
kw[k] = v
return kw
line_cap_map = {
constants.CAP_ROUND: 'round',
constants.CAP_SQUARE: 'square',
constants.CAP_BUTT: 'butt'
}
line_join_map = {
constants.JOIN_ROUND: 'round',
constants.JOIN_BEVEL: 'bevel',
constants.JOIN_MITER: 'miter'
}
font_map = {'Arial': 'Helvetica',
}
import _fontdata
xmltemplate = """<?xml version="1.0"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN"
"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:text="http://xmlns.graougraou.com/svg/text/"
xmlns:a3="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
a3:scriptImplementation="Adobe"
width="%(width)f"
height="%(height)f"
viewBox="0 0 %(width)f %(height)f"
>
<g transform="translate(0,%(height)f)">
<g transform="scale(1,-1)">
%(contents)s
</g>
</g>
</svg>
"""
htmltemplate = """<html xmlns:svg="http://www.w3.org/2000/svg">
<object id="AdobeSVG" CLASSID="clsid:78156a80-c6a1-4bbf-8e6a-3cd390eeb4e2">
</object>
<?import namespace="svg" implementation="#AdobeSVG"?>
<body>
<svg:svg width="100%%" height="100%%" viewBox="0 0 %(width)f %(height)f">
%(contents)s
</svg:svg>
</body>
</html>
"""
font_map = {'Arial': 'Helvetica',
}
try:
# expensive way of computing string widths
import reportlab.pdfbase.pdfmetrics as pdfmetrics
import reportlab.pdfbase._fontdata as _fontdata
_reportlab_loaded = 1
except ImportError:
import pdfmetrics
import _fontdata
_reportlab_loaded = 0
font_face_map = {'Arial': 'Helvetica'}
# This backend has no compiled path object, yet.
class CompiledPath(object):
pass
_clip_counter = 0
class GraphicsContext(basecore2d.GraphicsContextBase):
def __init__(self, size, *args, **kwargs):
super(GraphicsContext, self).__init__(self, size, *args, **kwargs)
self.size = size
self._height = size[1]
self.contents = cStringIO.StringIO()
self._clipmap = {}
self.clip_id = None
def render(self, format):
assert format == 'svg'
height, width = self.size
contents = self.contents.getvalue().replace("<svg:", "<").replace("</svg:", "</")
return xmltemplate % locals()
def clear(self):
# TODO: clear the contents
pass
def width(self):
return self.size[0]
def height(self):
return self.size[1]
def save(self, filename):
f = open(filename, 'w')
ext = os.path.splitext(filename)[1]
if ext == '.svg':
template = xmltemplate
width, height = self.size
contents = self.contents.getvalue().replace("<svg:", "<").replace("</svg:", "</")
elif ext == '.html':
width, height = self.size[0]*3, self.size[1]*3
contents = self.contents.getvalue()
template = htmltemplate
else:
raise ValueError, "don't know how to write a %s file" % ext
f.write(template % locals())
# Text handling code
def set_font(self, font):
if font.face_name == '':
font.face_name = 'Arial'
self.face_name = font_face_map.get(font.face_name, font.face_name)
self.font = pdfmetrics.Font(self.face_name, self.face_name, pdfmetrics.defaultEncoding)
self.font_size = font.size
def device_show_text(self, text):
x,y = self.get_text_position()
x,y = self._fixpoints([[x,y]])[0]
ttm = self.get_text_matrix()
ctm = self.get_ctm() # not device_ctm!!
m = affine.concat(ctm,ttm)
tx,ty,sx,sy,angle = affine.trs_factor(m)
angle = '%3.3f' % (-angle / pi * 180.)
height = self.get_full_text_extent(text)[1]
self.contents.write('<g transform="translate(%(x)f,%(y)f)">\n' % locals())
self.contents.write('<g transform="scale(1,-1)">\n')
self._emit('text', contents=text, transform='"rotate('+angle+')"', kw={'font-family':repr(self.font.fontName),
'font-size': '"'+ str(self.font_size) + '"'})
self.contents.write('</g>\n')
self.contents.write('</g>\n')
def get_full_text_extent(self, text):
ascent,descent=_fontdata.ascent_descent[self.face_name]
descent = (-descent) * self.font_size / 1000.0
ascent = ascent * self.font_size / 1000.0
height = ascent + descent
width = pdfmetrics.stringWidth(text, self.face_name, self.font_size)
return width, height, descent, height*1.2 # assume leading of 1.2*height
# actual implementation =)
def device_fill_points(self, points, mode):
points = self._fixpoints(points)
if mode in (FILL, FILL_STROKE, EOF_FILL_STROKE):
fill = self._color(self.state.fill_color)
else:
fill = 'none'
if mode in (STROKE, FILL_STROKE, EOF_FILL_STROKE):
stroke = self._color(self.state.line_color)
else:
stroke = 'none'
if mode in (EOF_FILL_STROKE, EOF_FILL):
rule = 'evenodd'
else:
rule = 'nonzero'
linecap = line_cap_map[self.state.line_cap]
linejoin = line_join_map[self.state.line_join]
dasharray = self._dasharray()
width = '%3.3f' % self.state.line_width
if self.clip_id:
clip = '"url(#' + self.clip_id +')"'
else:
clip = None
if mode == STROKE:
opacity = '%1.3f' % self.state.line_color[-1]
self._emit('polyline',
points='"'+_strpoints(points)+'"',
kw=default_filter({'clip-path': (clip, None)}),
style=_mkstyle(default_filter({'opacity': (opacity, "1.000"),
'stroke': stroke,
'fill': 'none',
'stroke-width': (width, "1.000"),
'stroke-linejoin': (linejoin, 'miter'),
'stroke-linecap': (linecap, 'butt'),
'stroke-dasharray': (dasharray, 'none')})))
else:
opacity = '%1.3f' % self.state.fill_color[-1]
self._emit('polygon',
points='"'+_strpoints(points)+'"',
kw=default_filter({'clip-path': (clip, None)}),
style=_mkstyle(default_filter({'opacity': (opacity, "1.000"),
'stroke-width': (width, "1.000"),
'fill': fill,
'fill-rule': rule,
'stroke': stroke,
'stroke-linejoin': (linejoin, 'miter'),
'stroke-linecap': (linecap, 'butt'),
'stroke-dasharray': (dasharray, 'none')})))
def device_stroke_points(self, points, mode):
# handled by device_fill_points
pass
def _build(self, elname, **kw):
x = '<' + elname + ' '
for k,v in kw.items():
if type(v) == type(0.0):
v = '"%3.3f"' % v
elif type(v) == type(0):
v = '"%d"' % v
else:
v = '"%s"' % str(v)
x += k + '=' + v + ' '
x += '/>\n'
return x
def device_set_clipping_path(self, x, y, width, height):
##x,y,width,height = map(lambda x: '"' + str(x) + '"', [x,y,width,height])
##self._emit('rect', x=x, y=y, width=width, height=height,
## style=_mkstyle({'stroke-width': 5,
## 'fill':'none',
## 'stroke': 'green'}))
##
##return
global _clip_counter
self.clip_id = 'clip_%d' % _clip_counter
_clip_counter += 1
x,y = self._fixpoints([[x,y]])[0]
rect = self._build('rect', x=x, y=y, width=width, height=height)
self._emit('clipPath', contents=rect, id='"'+self.clip_id + '"')
def device_destroy_clipping_path(self):
self.clip_id = None
# utility routines
def _fixpoints(self, points):
return points
# convert lines from Kiva coordinate space to PIL coordinate space
# XXX I suspect this is the location of the bug w.r.t. compound graphs and
# "global" sizing.
# XXX this should be made more efficient for NumPy arrays
np = []
for (x,y) in points:
np.append((x,self._height-y))
return np
def _emit(self, name, contents=None, kw={}, **otherkw):
self.contents.write('<svg:%(name)s ' % locals())
for k, v in kw.items():
self.contents.write("%(k)s=%(v)s " % locals())
for k, v in otherkw.items():
self.contents.write("%(k)s=%(v)s " % locals())
if contents is None:
self.contents.write('/>\n')
else:
self.contents.write('>\n')
self.contents.write(contents)
self.contents.write('</svg:'+name+'>\n')
def _color(self, color):
r,g,b,a = color
return '#%02x%02x%02x' % (r*255,g*255,b*255)
def _dasharray(self):
dasharray = ''
for x in self.state.line_dash:
if type(x) == type(arange(3)): # why is this so hard?
x = ravel(x)[0]
dasharray += ' ' + '%3.2f' % x
if not dasharray or dasharray == " 0.00 0.00":
dasharray = 'none'
return dasharray
# noops which seem to be needed
def device_update_line_state(self):
pass
def device_update_fill_state(self):
pass
def font_metrics_provider():
return GraphicsContext((1,1))
SVGGC = GraphicsContext # for b/w compatibility
if __name__ == "__main__":
if len(sys.argv) == 1:
print "Usage: %s output_file (where output_file ends in .html or .svg" % sys.argv[0]
raise SystemExit
|
