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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
from cStringIO import StringIO
from numpy import arange, ravel, array
import warnings
# Local, relative Kiva imports
import affine
import basecore2d
import constants
from constants import FILL, FILL_STROKE, EOF_FILL_STROKE, EOF_FILL, STROKE
import agg
from base64 import b64encode
def _strpoints(points):
c = 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/"
xmlns:xlink="http://www.w3.org/1999/xlink"
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"
xmlns:xlink="http://www.w3.org/1999/xlink">
<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', '': '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 = StringIO()
self._clipmap = {}
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):
self.contents = StringIO()
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):
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
# actual implementation =)
def device_show_text(self, text):
ttm = self.get_text_matrix()
ctm = self.get_ctm() # not device_ctm!!
m = affine.concat(ctm,ttm)
#height = self.get_full_text_extent(text)[1]
a,b,c,d,tx,ty = affine.affine_params(m)
transform = 'matrix(%(a)f,%(b)f,%(c)f,%(d)f,%(tx)f,%(ty)f) scale(1,-1)' % locals()
self._emit('text', contents=text,
kw={'font-family': self.face_name,
'font-size': str(self.font_size),
'xml:space': 'preserve',
'transform': transform})
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
def device_draw_image(self, img, rect):
"""
draw_image(img_gc, rect=(x,y,w,h))
Draws another gc into this one. If 'rect' is not provided, then
the image gc is drawn into this one, rooted at (0,0) and at full
pixel size. If 'rect' is provided, then the image is resized
into the (w,h) given and drawn into this GC at point (x,y).
img_gc is either a Numeric array (WxHx3 or WxHx4) or a GC from Kiva's
Agg backend (kiva.agg.GraphicsContextArray).
Requires the Python Imaging Library (PIL).
"""
from PIL import Image as PilImage
# We turn img into a PIL object, since that is what ReportLab
# requires. To do this, we first determine if the input image
# GC needs to be converted to RGBA/RGB. If so, we see if we can
# do it nicely (using convert_pixel_format), and if not, we do
# it brute-force using Agg.
if type(img) == type(array([])):
# Numeric array
converted_img = agg.GraphicsContextArray(img, pix_format='rgba32')
format = 'RGBA'
elif isinstance(img, agg.GraphicsContextArray):
if img.format().startswith('RGBA'):
format = 'RGBA'
elif img.format().startswith('RGB'):
format = 'RGB'
else:
converted_img = img.convert_pixel_format('rgba32', inplace=0)
format = 'RGBA'
# Should probably take this into account
# interp = img.get_image_interpolation()
else:
warnings.warn("Cannot render image of type %r into SVG context."
% type(img))
return
# converted_img now holds an Agg graphics context with the image
pil_img = PilImage.fromstring(format,
(converted_img.width(),
converted_img.height()),
converted_img.bmp_array.tostring())
if rect == None:
rect = (0, 0, img.width(), img.height())
left, top, width, height = rect
if width != img.width() or height != img.height():
# This is not strictly required.
pil_img = pil_img.resize((int(width), int(height)), PilImage.NEAREST)
png_buffer = StringIO()
pil_img.save(png_buffer, 'png')
b64_img_data = b64encode(png_buffer.getvalue())
png_buffer.close()
# Draw the actual image.
m = self.get_ctm()
# Place the image on the page.
# Using bottom instead of top here to account for the y-flip.
m = affine.translate(m, left, height + top)
transform = 'matrix(%f,%f,%f,%f,%f,%f) scale(1,-1)' % affine.affine_params(m)
# Flip y to reverse the flip at the start of the document.
image_data = 'data:image/png;base64,' + b64_img_data
self._emit('image', transform=transform,
width=str(width), height=str(height),
preserveAspectRatio='none',
kw={ 'xlink:href': image_data })
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
clip_id = getattr(self.state, '_clip_id', None)
if clip_id:
clip = 'url(#' + clip_id +')'
else:
clip = None
a,b,c,d,tx,ty = affine.affine_params(self.get_ctm())
transform = 'matrix(%(a)f,%(b)f,%(c)f,%(d)f,%(tx)f,%(ty)f)' % locals()
if mode == STROKE:
opacity = '%1.3f' % self.state.line_color[-1]
self._emit('polyline',
transform=transform,
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',
transform=transform,
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, contents=None, **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 + '" '
if contents is None:
x += '/>\n'
else:
x += '>'
if elname != 'text':
x += '\n'
x += contents
x += '</'+elname+'>\n'
return x
def _debug_draw_clipping_path(self, x, y, width, height):
a,b,c,d,tx,ty = affine.affine_params(self.get_ctm())
transform = 'matrix(%(a)f,%(b)f,%(c)f,%(d)f,%(tx)f,%(ty)f)' % locals()
self._emit('rect', x=x, y=y, width=width, height=height,
transform=transform,
style=_mkstyle({'stroke-width': 5,
'fill':'none',
'stroke': 'green'}))
def device_set_clipping_path(self, x, y, width, height):
#self._debug_draw_clipping_path(x, y, width, height)
#return
global _clip_counter
self.state._clip_id = 'clip_%d' % _clip_counter
_clip_counter += 1
x,y = self._fixpoints([[x,y]])[0]
a,b,c,d,tx,ty = affine.affine_params(self.get_ctm())
transform = 'matrix(%(a)f,%(b)f,%(c)f,%(d)f,%(tx)f,%(ty)f)' % locals()
rect = self._build('rect', x=x, y=y, width=width, height=height)
clippath = self._build('clipPath', contents=rect, id=self.state._clip_id)
self._emit('g', transform=transform, contents=clippath)
def device_destroy_clipping_path(self):
self.state._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('>')
if name != 'text':
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
|
