kopia lustrzana https://github.com/evil-mad/EggBot
674 wiersze
19 KiB
Python
674 wiersze
19 KiB
Python
#!/usr/bin/env python
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# Written by Daniel C. Newman ( dan dot newman at mtbaldy dot us )
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# 19 October 2010
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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import math
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import inkex
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import simplepath
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import simplestyle
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import simpletransform
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import cubicsuperpath
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import cspsubdiv
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import bezmisc
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N_PAGE_WIDTH = 3200
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N_PAGE_HEIGHT = 800
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def inverseTransform ( tran ):
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'''
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An SVG transform matrix looks like
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[ a c e ]
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[ b d f ]
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[ 0 0 1 ]
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And it's inverse is
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[ d -c cf - de ]
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[ -b a be - af ] * ( ad - bc ) ** -1
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[ 0 0 1 ]
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And, no reasonable 2d coordinate transform will have
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the products ad and bc equal.
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SVG represents the transform matrix column by column as
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matrix(a b c d e f) while Inkscape extensions store the
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transform matrix as
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[[a, c, e], [b, d, f]]
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To invert the transform stored Inskcape style, we wish to
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produce
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[[d/D, -c/D, (cf - de)/D], [-b/D, a/D, (be-af)/D]]
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where
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D = 1 / (ad - bc)
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'''
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D = tran[0][0] * tran[1][1] - tran[1][0] * tran[0][1]
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if D == 0:
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return None
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return [[tran[1][1]/D, -tran[0][1]/D,
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(tran[0][1]*tran[1][2] - tran[1][1]*tran[0][2])/D],
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[-tran[1][0]/D, tran[0][0]/D,
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(tran[1][0]*tran[0][2] - tran[0][0]*tran[1][2])/D]]
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def parseLengthWithUnits( str ):
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'''
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Parse an SVG value which may or may not have units attached
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This version is greatly simplified in that it only allows: no units,
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units of px, and units of %. Everything else, it returns None for.
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There is a more general routine to consider in scour.py if more
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generality is ever needed.
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'''
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u = 'px'
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s = str.strip()
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if s[-2:] == 'px':
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s = s[:-2]
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elif s[-1:] == '%':
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u = '%'
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s = s[:-1]
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try:
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v = float( s )
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except:
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return None, None
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return v, u
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def subdivideCubicPath( sp, flat, i=1 ):
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'''
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[ Lifted from eggbot.py with impunity ]
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Break up a bezier curve into smaller curves, each of which
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is approximately a straight line within a given tolerance
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(the "smoothness" defined by [flat]).
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This is a modified version of cspsubdiv.cspsubdiv(): rewritten
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because recursion-depth errors on complicated line segments
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could occur with cspsubdiv.cspsubdiv().
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'''
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while True:
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while True:
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if i >= len( sp ):
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return
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p0 = sp[i - 1][1]
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p1 = sp[i - 1][2]
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p2 = sp[i][0]
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p3 = sp[i][1]
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b = ( p0, p1, p2, p3 )
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if cspsubdiv.maxdist( b ) > flat:
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break
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i += 1
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one, two = bezmisc.beziersplitatt( b, 0.5 )
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sp[i - 1][2] = one[1]
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sp[i][0] = two[2]
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p = [one[2], one[3], two[1]]
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sp[i:1] = [p]
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class Map( inkex.Effect ):
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def __init__( self ):
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inkex.Effect.__init__( self )
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self.OptionParser.add_option('--smoothness', dest='smoothness',
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type='float', default=float( 0.2 ), action='store',
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help='Curve smoothing (less for more)' )
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self.OptionParser.add_option('--maxDy', dest='maxDy',
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type='float', default=float( 5.0 ), action='store',
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help='Vertical smoothing (less for more)' )
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self.cx = float( N_PAGE_WIDTH ) / 2.0
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self.cy = float( N_PAGE_HEIGHT ) / 2.0
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self.xmin, self.xmax = ( 1.0E70, -1.0E70 )
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self.maxDy = float( 5 )
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self.paths = {}
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self.transforms = {}
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# For handling an SVG viewbox attribute, we will need to know the
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# values of the document's <svg> width and height attributes as well
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# as establishing a transform from the viewbox to the display.
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self.docWidth = float( N_PAGE_WIDTH )
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self.docHeight = float( N_PAGE_HEIGHT )
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self.docTransform = [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]]
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def getLength( self, name, default ):
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'''
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Get the <svg> attribute with name "name" and default value "default"
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Parse the attribute into a value and associated units. Then, accept
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no units (''), units of pixels ('px'), and units of percentage ('%').
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'''
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str = self.document.getroot().get( name )
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if str:
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v, u = parseLengthWithUnits( str )
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if not v:
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# Couldn't parse the value
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return None
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elif ( u == '' ) or ( u == 'px' ):
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return v
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elif u == '%':
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return float( default ) * v / 100.0
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else:
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# Unsupported units
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return None
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else:
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# No width specified; assume the default value
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return float( default )
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def getDocProps( self ):
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'''
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Get the document's height and width attributes from the <svg> tag.
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Use a default value in case the property is not present or is
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expressed in units of percentages.
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'''
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self.docHeight = self.getLength( 'height', N_PAGE_HEIGHT )
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self.docWidth = self.getLength( 'width', N_PAGE_WIDTH )
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if ( self.docHeight == None ) or ( self.docWidth == None ):
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return False
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else:
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return True
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def handleViewBox( self ):
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'''
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Set up the document-wide transform in the event that the document has an SVG viewbox
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'''
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if self.getDocProps():
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viewbox = self.document.getroot().get( 'viewBox' )
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if viewbox:
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vinfo = viewbox.strip().replace( ',', ' ' ).split( ' ' )
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if ( vinfo[2] != 0 ) and ( vinfo[3] != 0 ):
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sx = self.docWidth / float( vinfo[2] )
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sy = self.docHeight / float( vinfo[3] )
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self.docTransform = simpletransform.parseTransform( 'scale(%f,%f)' % (sx, sy) )
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def getPathVertices( self, path, node=None, transform=None, find_bbox=False ):
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'''
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Decompose the path data from an SVG element into individual
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subpaths, each subpath consisting of absolute move to and line
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to coordinates. Place these coordinates into a list of polygon
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vertices.
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'''
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if ( not path ) or ( len( path ) == 0 ):
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# Nothing to do
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return None
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# parsePath() may raise an exception. This is okay
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sp = simplepath.parsePath( path )
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if ( not sp ) or ( len( sp ) == 0 ):
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# Path must have been devoid of any real content
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return None
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# Get a cubic super path
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p = cubicsuperpath.CubicSuperPath( sp )
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if ( not p ) or ( len( p ) == 0 ):
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# Probably never happens, but...
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return None
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if transform:
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simpletransform.applyTransformToPath( transform, p )
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# Now traverse the cubic super path
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subpath_list = []
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subpath_vertices = []
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for sp in p:
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if len( subpath_vertices ):
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subpath_list.append( subpath_vertices )
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subpath_vertices = []
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last_csp = None
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subdivideCubicPath( sp, float( self.options.smoothness ) )
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for csp in sp:
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if ( last_csp != None ) and ( math.fabs( csp[1][1] - last_csp[1] ) > self.options.maxDy ):
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dy = ( csp[1][1] - last_csp[1] )
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dx = ( csp[1][0] - last_csp[0] )
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nsteps = math.ceil( math.fabs( dy / self.options.maxDy ) )
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for n in range( 1, int( 1 + nsteps ) ):
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s = n / nsteps
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subpath_vertices.append( [ last_csp[0] + s * dx, last_csp[1] + s * dy ] )
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else:
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# Add this vertex to the list of vetices
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subpath_vertices.append( csp[1] )
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last_csp = csp[1]
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if find_bbox:
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if last_csp[0] < self.xmin:
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self.xmin = last_csp[0]
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elif last_csp[0] > self.xmax:
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self.xmax = last_csp[0]
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# Handle final subpath
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if len( subpath_vertices ):
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subpath_list.append( subpath_vertices )
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if len( subpath_list ) > 0:
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self.paths[node] = subpath_list
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self.transforms[node] = transform
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def mapPathVertices( self, node ):
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steps2rads = math.pi / float( 1600 )
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transform = self.transforms[node]
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if transform is None:
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invTransform = None
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else:
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invTransform = inverseTransform( transform )
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newPath = ''
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for subpath in self.paths[node]:
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lastPoint = subpath[0]
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lastPoint[0] = self.cx + ( lastPoint[0] - self.cx ) / math.cos( ( lastPoint[1] - self.cy ) * steps2rads )
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if invTransform != None:
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simpletransform.applyTransformToPoint( invTransform, lastPoint )
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newPath += ' M %f,%f' % ( lastPoint[0], lastPoint[1] )
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for point in subpath[1:]:
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x = self.cx + ( point[0] - self.cx ) / math.cos( ( point[1] - self.cy ) * steps2rads )
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pt = [x, point[1] ]
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if invTransform != None:
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simpletransform.applyTransformToPoint( invTransform, pt )
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newPath += ' l %f,%f' % ( pt[0] - lastPoint[0], pt[1] - lastPoint[1] )
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lastPoint = pt
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self.paths[node] = newPath
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def recursivelyTraverseSvg( self, aNodeList,
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matCurrent=[[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]],
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parent_visibility='visible', find_bbox=False ):
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'''
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[ This too is largely lifted from eggbot.py ]
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Recursively walk the SVG document, building polygon vertex lists
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for each graphical element we support.
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Rendered SVG elements:
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<circle>, <ellipse>, <line>, <path>, <polygon>, <polyline>, <rect>
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Supported SVG elements:
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<group>, <use>
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Ignored SVG elements:
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<defs>, <eggbot>, <metadata>, <namedview>, <pattern>,
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processing directives
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All other SVG elements trigger an error (including <text>)
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'''
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for node in aNodeList:
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# Ignore invisible nodes
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v = node.get( 'visibility', parent_visibility )
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if v == 'inherit':
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v = parent_visibility
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if v == 'hidden' or v == 'collapse':
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pass
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# First apply the current matrix transform to this node's tranform
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matNew = simpletransform.composeTransform( matCurrent, simpletransform.parseTransform( node.get( "transform" ) ) )
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if node.tag == inkex.addNS( 'g', 'svg' ) or node.tag == 'g':
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self.recursivelyTraverseSvg( node, matNew, v, find_bbox )
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elif node.tag == inkex.addNS( 'use', 'svg' ) or node.tag == 'use':
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# A <use> element refers to another SVG element via an xlink:href="#blah"
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# attribute. We will handle the element by doing an XPath search through
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# the document, looking for the element with the matching id="blah"
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# attribute. We then recursively process that element after applying
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# any necessary (x,y) translation.
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#
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# Notes:
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# 1. We ignore the height and width attributes as they do not apply to
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# path-like elements, and
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# 2. Even if the use element has visibility="hidden", SVG still calls
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# for processing the referenced element. The referenced element is
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# hidden only if its visibility is "inherit" or "hidden".
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refid = node.get( inkex.addNS( 'href', 'xlink' ) )
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if not refid:
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pass
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# [1:] to ignore leading '#' in reference
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path = '//*[@id="%s"]' % refid[1:]
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refnode = node.xpath( path )
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if refnode:
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x = float( node.get( 'x', '0' ) )
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y = float( node.get( 'y', '0' ) )
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# Note: the transform has already been applied
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if ( x != 0 ) or (y != 0 ):
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matNew2 = composeTransform( matNew, parseTransform( 'translate(%f,%f)' % (x,y) ) )
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else:
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matNew2 = matNew
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v = node.get( 'visibility', v )
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self.recursivelyTraverseSvg( refnode, matNew2, v, find_bbox )
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elif node.tag == inkex.addNS( 'path', 'svg' ):
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path_data = node.get( 'd')
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if path_data:
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self.getPathVertices( path_data, node, matNew, find_bbox )
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elif node.tag == inkex.addNS( 'rect', 'svg' ) or node.tag == 'rect':
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# Manually transform
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#
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# <rect x="X" y="Y" width="W" height="H"/>
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#
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# into
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#
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# <path d="MX,Y lW,0 l0,H l-W,0 z"/>
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#
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# I.e., explicitly draw three sides of the rectangle and the
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# fourth side implicitly
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# Create a path with the outline of the rectangle
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x = float( node.get( 'x' ) )
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y = float( node.get( 'y' ) )
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if ( not x ) or ( not y ):
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pass
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w = float( node.get( 'width', '0' ) )
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h = float( node.get( 'height', '0' ) )
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a = []
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a.append( ['M ', [x, y]] )
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a.append( [' l ', [w, 0]] )
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a.append( [' l ', [0, h]] )
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a.append( [' l ', [-w, 0]] )
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a.append( [' Z', []] )
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self.getPathVertices( simplepath.formatPath( a ), node, matNew, find_bbox )
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elif node.tag == inkex.addNS( 'line', 'svg' ) or node.tag == 'line':
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# Convert
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#
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# <line x1="X1" y1="Y1" x2="X2" y2="Y2/>
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#
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# to
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#
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# <path d="MX1,Y1 LX2,Y2"/>
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x1 = float( node.get( 'x1' ) )
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y1 = float( node.get( 'y1' ) )
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x2 = float( node.get( 'x2' ) )
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y2 = float( node.get( 'y2' ) )
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if ( not x1 ) or ( not y1 ) or ( not x2 ) or ( not y2 ):
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pass
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a = []
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a.append( ['M ', [x1, y1]] )
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a.append( [' L ', [x2, y2]] )
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self.getPathVertices( simplepath.formatPath( a ), node, matNew, find_bbox )
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elif node.tag == inkex.addNS( 'polyline', 'svg' ) or node.tag == 'polyline':
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# Convert
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#
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# <polyline points="x1,y1 x2,y2 x3,y3 [...]"/>
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#
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# to
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#
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# <path d="Mx1,y1 Lx2,y2 Lx3,y3 [...]"/>
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#
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# Note: we ignore polylines with no points
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pl = node.get( 'points', '' ).strip()
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if pl == '':
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pass
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pa = pl.split()
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d = "".join( ["M " + pa[i] if i == 0 else " L " + pa[i] for i in range( 0, len( pa ) )] )
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self.getPathVertices( d, node, matNew, find_bbox )
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elif node.tag == inkex.addNS( 'polygon', 'svg' ) or node.tag == 'polygon':
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# Convert
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#
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# <polygon points="x1,y1 x2,y2 x3,y3 [...]"/>
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#
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# to
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#
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# <path d="Mx1,y1 Lx2,y2 Lx3,y3 [...] Z"/>
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#
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# Note: we ignore polygons with no points
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pl = node.get( 'points', '' ).strip()
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if pl == '':
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pass
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pa = pl.split()
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d = "".join( ["M " + pa[i] if i == 0 else " L " + pa[i] for i in range( 0, len( pa ) )] )
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d += " Z"
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self.getPathVertices( d, node, matNew, find_bbox )
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elif node.tag == inkex.addNS( 'ellipse', 'svg' ) or \
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node.tag == 'ellipse' or \
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node.tag == inkex.addNS( 'circle', 'svg' ) or \
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node.tag == 'circle':
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# Convert circles and ellipses to a path with two 180 degree arcs.
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# In general (an ellipse), we convert
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#
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# <ellipse rx="RX" ry="RY" cx="X" cy="Y"/>
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#
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# to
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#
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# <path d="MX1,CY A RX,RY 0 1 0 X2,CY A RX,RY 0 1 0 X1,CY"/>
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#
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# where
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#
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# X1 = CX - RX
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# X2 = CX + RX
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#
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# Note: ellipses or circles with a radius attribute of value 0 are ignored
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if node.tag == inkex.addNS( 'ellipse', 'svg' ) or node.tag == 'ellipse':
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rx = float( node.get( 'rx', '0' ) )
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|
ry = float( node.get( 'ry', '0' ) )
|
|
else:
|
|
rx = float( node.get( 'r', '0' ) )
|
|
ry = rx
|
|
if rx == 0 or ry == 0:
|
|
pass
|
|
|
|
cx = float( node.get( 'cx', '0' ) )
|
|
cy = float( node.get( 'cy', '0' ) )
|
|
x1 = cx - rx
|
|
x2 = cx + rx
|
|
d = 'M %f,%f ' % ( x1, cy ) + \
|
|
'A %f,%f ' % ( rx, ry ) + \
|
|
'0 1 0 %f,%f ' % ( x2, cy ) + \
|
|
'A %f,%f ' % ( rx, ry ) + \
|
|
'0 1 0 %f,%f' % ( x1, cy )
|
|
self.mapPathVertices( d, node, matNew, find_bbox )
|
|
|
|
elif node.tag == inkex.addNS( 'pattern', 'svg' ) or node.tag == 'pattern':
|
|
|
|
pass
|
|
|
|
elif node.tag == inkex.addNS( 'metadata', 'svg' ) or node.tag == 'metadata':
|
|
|
|
pass
|
|
|
|
elif node.tag == inkex.addNS( 'defs', 'svg' ) or node.tag == 'defs':
|
|
|
|
pass
|
|
|
|
elif node.tag == inkex.addNS( 'namedview', 'sodipodi' ) or node.tag == 'namedview':
|
|
|
|
pass
|
|
|
|
elif node.tag == inkex.addNS( 'eggbot', 'svg' ) or node.tag == 'eggbot':
|
|
|
|
pass
|
|
|
|
elif node.tag == inkex.addNS( 'text', 'svg' ) or node.tag == 'text':
|
|
|
|
inkex.errormsg( 'Warning: unable to draw text, please convert it to a path first.' )
|
|
|
|
pass
|
|
|
|
elif not isinstance( node.tag, basestring ):
|
|
|
|
pass
|
|
|
|
else:
|
|
|
|
inkex.errormsg( 'Warning: unable to draw object <%s>, please convert it to a path first.' % node.tag )
|
|
pass
|
|
|
|
def recursivelyReplaceSvg( self, nodes, parent_visibility='visible' ):
|
|
|
|
for i in range( 0, len( nodes ) ):
|
|
|
|
node = nodes[i]
|
|
|
|
# Ignore invisible nodes
|
|
v = node.get( 'visibility', parent_visibility )
|
|
if v == 'inherit':
|
|
v = parent_visibility
|
|
if v == 'hidden' or v == 'collapse':
|
|
pass
|
|
|
|
if node.tag == inkex.addNS( 'g', 'svg' ) or node.tag == 'g':
|
|
|
|
self.recursivelyReplaceSvg( node, parent_visibility=v )
|
|
|
|
elif node.tag == inkex.addNS( 'path', 'svg' ):
|
|
|
|
if self.paths.has_key( node ):
|
|
# Change the path data to be the new path
|
|
node.set( 'd', self.paths[node][1:] )
|
|
del self.paths[node]
|
|
|
|
elif node.tag == inkex.addNS( 'use', 'svg' ) or node.tag == 'use' or \
|
|
node.tag == inkex.addNS( 'rect', 'svg' ) or node.tag == 'rect' or \
|
|
node.tag == inkex.addNS( 'line', 'svg' ) or node.tag == 'line' or \
|
|
node.tag == inkex.addNS( 'polyline', 'svg' ) or node.tag == 'polyline' or \
|
|
node.tag == inkex.addNS( 'polygon', 'svg' ) or node.tag == 'polygon' or \
|
|
node.tag == inkex.addNS( 'ellipse', 'svg' ) or node.tag == 'ellipse' or \
|
|
node.tag == inkex.addNS( 'circle', 'svg' ) or node.tag == 'circle':
|
|
# Replace this element with a <path> element
|
|
|
|
if self.paths.has_key( node ):
|
|
# Create a new <path> element
|
|
# We simply copy all of the attributes from
|
|
# the old element to this new element even though
|
|
# some of the attributes are no longer relevant
|
|
newNode = inkex.etree.Element( inkex.addNS( 'path', 'svg' ), node.attrib )
|
|
newNode.set( 'd', self.paths[node][1:] )
|
|
|
|
# Now replace the old element with this element
|
|
nodes[i] = newNode
|
|
|
|
# And dispose of the old data and element
|
|
del self.paths[node]
|
|
del node
|
|
|
|
else:
|
|
|
|
pass
|
|
|
|
def recursivelyGetEnclosingTransform( self, node ):
|
|
|
|
'''
|
|
Determine the cumulative transform which node inherits from
|
|
its chain of ancestors.
|
|
'''
|
|
node = node.getparent()
|
|
if node is not None:
|
|
parent_transform = self.recursivelyGetEnclosingTransform( node )
|
|
node_transform = node.get( 'transform', None )
|
|
if node_transform is None:
|
|
return parent_transform
|
|
else:
|
|
tr = simpletransform.parseTransform( node_transform )
|
|
if parent_transform is None:
|
|
return tr
|
|
else:
|
|
return simpletransform.composeTransform( parent_transform, tr )
|
|
else:
|
|
return self.docTransform
|
|
|
|
def effect( self ):
|
|
|
|
# Viewbox handling
|
|
self.handleViewBox()
|
|
|
|
# Locate the center of the document by obtaining its dimensions
|
|
if ( self.docHeight is None ) or (self.docWidth is None ):
|
|
inkex.errormsg( 'Document has inappropriate width or height units' )
|
|
return
|
|
self.cy = self.docHeight / float ( 2 )
|
|
self.cx = self.docWidth / float( 2 )
|
|
|
|
# First traverse the document (or selected items), reducing
|
|
# everything to line segments. If working on a selection,
|
|
# then determine the selection's bounding box in the process.
|
|
# (Actually, we just need to know it's extrema on the x-axis.)
|
|
|
|
if self.options.ids:
|
|
# Traverse the selected objects
|
|
for id in self.options.ids:
|
|
transform = self.recursivelyGetEnclosingTransform( self.selected[id] )
|
|
self.recursivelyTraverseSvg( [self.selected[id]], transform, find_bbox=True )
|
|
# Use as the vertical centerline the midpoint between
|
|
# the bounding box's extremal X coordinates
|
|
self.cx = 0.5 * ( self.xmin + self.xmax )
|
|
else:
|
|
# Traverse the entire document building new, transformed paths
|
|
self.recursivelyTraverseSvg( self.document.getroot(), self.docTransform )
|
|
|
|
# Now that we know the x-axis extrema, we can remap the data
|
|
# Had we know the x-axis extrema in advance (i.e., operating
|
|
# on the entire document), then we could have done the mapping
|
|
# at the same time we "rendered" everything to line segments.
|
|
|
|
for key in self.paths:
|
|
self.mapPathVertices( key )
|
|
|
|
# And now replace the old paths with the new paths
|
|
# WE DO NOT compute and replace the paths in the same pass!
|
|
# So doing can cause multiple transformations of cloned paths
|
|
|
|
self.recursivelyReplaceSvg( self.document.getroot(), self.docTransform )
|
|
|
|
if __name__ == '__main__':
|
|
|
|
e = Map()
|
|
e.affect()
|