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ezdxf_exporter.py
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ezdxf_exporter.py
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#! /usr/bin/python3 -sP
# coding=utf-8
#
# Copyright (C) 2005,2007,2008 Aaron Spike, aaron@ekips.org
# Copyright (C) 2008,2010 Alvin Penner, penner@vaxxine.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.
#
"""
This file output script for Inkscape creates a AutoCAD R14 DXF file.
The spec can be found here: http://www.autodesk.com/techpubs/autocad/acadr14/dxf/index.htm.
File history:
- template dxf_outlines.dxf added Feb 2008 by Alvin Penner
- ROBO-Master output option added Aug 2008
- ROBO-Master multispline output added Sept 2008
- LWPOLYLINE output modification added Dec 2008
- toggle between LINE/LWPOLYLINE added Jan 2010
- support for transform elements added July 2010
- support for layers added July 2010
- support for rectangle added Dec 2010
"""
from __future__ import print_function
import inkex
from inkex import (
colors,
bezier,
Transform,
Group,
Layer,
Use,
PathElement,
Rectangle,
Line,
Circle,
Ellipse,
)
from inkex.localization import inkex_gettext as _
import ezdxf
import io
from uuid import uuid4
import random
def get_matrix(u, i, j):
if j == i + 2:
return (
(u[i] - u[i - 1])
* (u[i] - u[i - 1])
/ (u[i + 2] - u[i - 1])
/ (u[i + 1] - u[i - 1])
)
elif j == i + 1:
return (
(u[i] - u[i - 1]) * (u[i + 2] - u[i]) / (u[i + 2] - u[i - 1])
+ (u[i + 1] - u[i]) * (u[i] - u[i - 2]) / (u[i + 1] - u[i - 2])
) / (u[i + 1] - u[i - 1])
elif j == i:
return (
(u[i + 1] - u[i])
* (u[i + 1] - u[i])
/ (u[i + 1] - u[i - 2])
/ (u[i + 1] - u[i - 1])
)
else:
return 0
def get_fit(u, csp, col):
return (
(1 - u) ** 3 * csp[0][col]
+ 3 * (1 - u) ** 2 * u * csp[1][col]
+ 3 * (1 - u) * u**2 * csp[2][col]
+ u**3 * csp[3][col]
)
def class2layer(self, svg):
layer_list = []
xpath_expr = "//*[contains(concat(' ', normalize-space(@class), ' '), ' Ifc')]"
elements = svg.xpath(xpath_expr)
for element in elements:
classes = element.get('class').split()
IfcClass = [string for string in classes if string.startswith('Ifc')][0]
inkex.utils.debug(IfcClass)
if IfcClass not in layer_list:
layer = svg.add(Group(id=IfcClass))
layer.set('inkscape:groupmode', 'layer')
layer.set('inkscape:label', IfcClass)
layer_list.append(IfcClass)
self.dxf.layers.add(
name=IfcClass,
color=random.randint(1, 255)
)
else:
layer = svg.getElementById(IfcClass)
layer.add(element)
# inkex.utils.debug(IfcClass)
return svg
def to_binary_data(doc):
dxf_stream = io.StringIO()
doc.write(dxf_stream)
dxf_data = dxf_stream.getvalue()
dxf_stream.close()
return dxf_data.encode()
def get_insert_point(node, mat):
if not isinstance(node, (PathElement, Rectangle, Line, Circle, Ellipse)):
return
path = node.path.to_superpath().transform(Transform(mat) @ node.transform)
return [path[0][0][1][0], path[0][0][1][1]]
class EzDxfExporter(inkex.OutputExtension):
def add_arguments(self, pars):
# pars.add_argument("--tab")
# pars.add_argument("-R", "--ROBO", type=inkex.Boolean, default=False)
# pars.add_argument("-P", "--POLY", type=inkex.Boolean, default=False)
# pars.add_argument("-F", "--FLATTENBEZ", type=inkex.Boolean, default=False)
# pars.add_argument(
# "--unit_from_document", type=inkex.Boolean, default=True
# ) # px
# pars.add_argument("--units", default="px") # px
# pars.add_argument("--encoding", dest="char_encode", default="latin_1")
# pars.add_argument("--layer_option", default="all")
# pars.add_argument("--layer_name")
# self.dxf = []
# self.handle = 255 # handle for DXF ENTITY
# self.layers = ["0"]
self.layer = "0" # mandatory layer
# self.layernames = []
# self.csp_old = [[0.0, 0.0]] * 4 # previous spline
# self.d = [0.0] # knot vector
# self.poly = [[0.0, 0.0]] # LWPOLYLINE data
def dxf_add(self, str):
self.dxf.append(str.encode(self.options.char_encode))
def dxf_line(self, block, csp, first_coord):
"""Draw a line in the DXF format"""
# self.handle += 1
# self.dxf_add(
# " 0\nLINE\n 5\n%x\n100\nAcDbEntity\n 8\n%s\n 62\n%d\n100\nAcDbLine\n"
# % (self.handle, self.layer, self.color)
# )
# self.dxf_add(
# " 10\n%f\n 20\n%f\n 30\n0.0\n 11\n%f\n 21\n%f\n 31\n0.0\n"
# % (csp[0][0], csp[0][1], csp[1][0], csp[1][1])
# )
line = block.add_line((csp[0][0], csp[0][1]),(csp[1][0], csp[1][1]))
line.translate(-first_coord[0], -first_coord[1], 0)
# def LWPOLY_line(self, csp):
# if (
# abs(csp[0][0] - self.poly[-1][0]) > 0.0001
# or abs(csp[0][1] - self.poly[-1][1]) > 0.0001
# or self.color_LWPOLY != self.color
# ): # THIS LINE IS NEW
# self.LWPOLY_output() # terminate current polyline
# self.poly = [csp[0]] # initiallize new polyline
# self.color_LWPOLY = self.color
# self.layer_LWPOLY = self.layer
# self.poly.append(csp[1])
# def LWPOLY_output(self):
# if len(self.poly) == 1:
# return
# self.handle += 1
# closed = 1
# if (
# abs(self.poly[0][0] - self.poly[-1][0]) > 0.0001
# or abs(self.poly[0][1] - self.poly[-1][1]) > 0.0001
# ):
# closed = 0
# self.dxf_add(
# " 0\nLWPOLYLINE\n 5\n%x\n100\nAcDbEntity\n 8\n%s\n 62\n%d\n100\nAcDbPolyline\n 90\n%d\n 70\n%d\n"
# % (
# self.handle,
# self.layer_LWPOLY,
# self.color_LWPOLY,
# len(self.poly) - closed,
# closed,
# )
# )
# for i in range(len(self.poly) - closed):
# self.dxf_add(
# " 10\n%f\n 20\n%f\n 30\n0.0\n" % (self.poly[i][0], self.poly[i][1])
# )
# def dxf_spline(self, csp):
# knots = 8
# ctrls = 4
# self.handle += 1
# self.dxf_add(
# " 0\nSPLINE\n 5\n%x\n100\nAcDbEntity\n 8\n%s\n 62\n%d\n100\nAcDbSpline\n"
# % (self.handle, self.layer, self.color)
# )
# self.dxf_add(" 70\n8\n 71\n3\n 72\n%d\n 73\n%d\n 74\n0\n" % (knots, ctrls))
# for i in range(2):
# for j in range(4):
# self.dxf_add(" 40\n%d\n" % i)
# for i in csp:
# self.dxf_add(" 10\n%f\n 20\n%f\n 30\n0.0\n" % (i[0], i[1]))
# def ROBO_spline(self, csp):
# """this spline has zero curvature at the endpoints, as in ROBO-Master"""
# if (
# abs(csp[0][0] - self.csp_old[3][0]) > 0.0001
# or abs(csp[0][1] - self.csp_old[3][1]) > 0.0001
# or abs(
# (csp[1][1] - csp[0][1]) * (self.csp_old[3][0] - self.csp_old[2][0])
# - (csp[1][0] - csp[0][0]) * (self.csp_old[3][1] - self.csp_old[2][1])
# )
# > 0.001
# ):
# self.ROBO_output() # terminate current spline
# self.xfit = [csp[0][0]] # initiallize new spline
# self.yfit = [csp[0][1]]
# self.d = [0.0]
# self.color_ROBO = self.color
# self.layer_ROBO = self.layer
# self.xfit += 3 * [0.0]
# self.yfit += 3 * [0.0]
# self.d += 3 * [0.0]
# for i in range(1, 4):
# j = len(self.d) + i - 4
# self.xfit[j] = get_fit(i / 3.0, csp, 0)
# self.yfit[j] = get_fit(i / 3.0, csp, 1)
# self.d[j] = self.d[j - 1] + bezier.pointdistance(
# (self.xfit[j - 1], self.yfit[j - 1]), (self.xfit[j], self.yfit[j])
# )
# self.csp_old = csp
# def ROBO_output(self):
# try:
# import numpy
# from numpy.linalg import solve
# except ImportError:
# inkex.errormsg(
# _(
# "Failed to import the numpy or numpy.linalg modules. "
# "These modules are required by the ROBO option."
# "Please install them and try again."
# )
# )
# return
# if len(self.d) == 1:
# return
# fits = len(self.d)
# ctrls = fits + 2
# knots = ctrls + 4
# self.xfit += 2 * [0.0] # pad with 2 endpoint constraints
# self.yfit += 2 * [0.0]
# self.d += 6 * [0.0] # pad with 3 duplicates at each end
# self.d[fits + 2] = self.d[fits + 1] = self.d[fits] = self.d[fits - 1]
# solmatrix = numpy.zeros((ctrls, ctrls), dtype=float)
# for i in range(fits):
# solmatrix[i, i] = get_matrix(self.d, i, i)
# solmatrix[i, i + 1] = get_matrix(self.d, i, i + 1)
# solmatrix[i, i + 2] = get_matrix(self.d, i, i + 2)
# solmatrix[fits, 0] = self.d[2] / self.d[fits - 1] # curvature at start = 0
# solmatrix[fits, 1] = -(self.d[1] + self.d[2]) / self.d[fits - 1]
# solmatrix[fits, 2] = self.d[1] / self.d[fits - 1]
# solmatrix[fits + 1, fits - 1] = (self.d[fits - 1] - self.d[fits - 2]) / self.d[
# fits - 1
# ] # curvature at end = 0
# solmatrix[fits + 1, fits] = (
# self.d[fits - 3] + self.d[fits - 2] - 2 * self.d[fits - 1]
# ) / self.d[fits - 1]
# solmatrix[fits + 1, fits + 1] = (self.d[fits - 1] - self.d[fits - 3]) / self.d[
# fits - 1
# ]
# xctrl = solve(solmatrix, self.xfit)
# yctrl = solve(solmatrix, self.yfit)
# self.handle += 1
# self.dxf_add(
# " 0\nSPLINE\n 5\n%x\n100\nAcDbEntity\n 8\n%s\n 62\n%d\n100\nAcDbSpline\n"
# % (self.handle, self.layer_ROBO, self.color_ROBO)
# )
# self.dxf_add(
# " 70\n0\n 71\n3\n 72\n%d\n 73\n%d\n 74\n%d\n" % (knots, ctrls, fits)
# )
# for i in range(knots):
# self.dxf_add(" 40\n%f\n" % self.d[i - 3])
# for i in range(ctrls):
# self.dxf_add(" 10\n%f\n 20\n%f\n 30\n0.0\n" % (xctrl[i], yctrl[i]))
# for i in range(fits):
# self.dxf_add(" 11\n%f\n 21\n%f\n 31\n0.0\n" % (self.xfit[i], self.yfit[i]))
def process_shape(self, node, mat, block, insert_point):
rgb = (0, 0, 0)
style = node.style("stroke")
if style is not None and isinstance(style, inkex.Color):
rgb = style.to_rgb()
hsl = colors.rgb_to_hsl(rgb[0] / 255.0, rgb[1] / 255.0, rgb[2] / 255.0)
self.color = 7 # default is blac
if hsl[2]:
self.color = 1 + (int(6 * hsl[0] + 0.5) % 6) # use 6 hues
if not isinstance(node, (PathElement, Rectangle, Line, Circle, Ellipse)):
return
# Transforming /after/ superpath is more reliable than before
# because of some issues with arcs in transformations
# path = node.path.transform(Transform(mat) @ node.transform)
path = node.path.to_superpath().transform(Transform(mat) @ node.transform)
# first_coord = [path[0][0][1][0], path[0][0][1][1]]
inkex.utils.debug('shape')
inkex.utils.debug(path[0][0][1])
inkex.utils.debug(path[0][1][1])
# inkex.utils.debug(first_coord)
# If Flatten Beziers is enabled, subdivide our beziers and
# we'll later just ignore the curve and output flat lines
# if self.options.FLATTENBEZ:
# bezier.cspsubdiv(path, 0.1) # default to most detailed (0.1)
# Now output the path.
for sub in path:
for i in range(len(sub) - 1):
s = sub[i]
e = sub[i + 1]
# If flattening beziers, ignore curves and output flat lines
# if (s[1] == s[2] and e[0] == e[1]) or self.options.FLATTENBEZ:
if (s[1] == s[2] and e[0] == e[1]):
# if self.options.POLY:
# self.LWPOLY_line([s[1], e[1]])
# else:
self.dxf_line(block, [s[1], e[1]], insert_point)
# elif self.options.ROBO:
# self.ROBO_spline([s[1], s[2], e[0], e[1]])
# else:
# self.dxf_spline([s[1], s[2], e[0], e[1]])
# return first_coord
def process_clone(self, node):
"""Process a clone node, looking for internal paths"""
trans = node.get("transform")
x = node.get("x")
y = node.get("y")
mat = Transform([[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]])
if trans:
mat @= Transform(trans)
if x:
mat @= Transform([[1.0, 0.0, float(x)], [0.0, 1.0, 0.0]])
if y:
mat @= Transform([[1.0, 0.0, 0.0], [0.0, 1.0, float(y)]])
# push transform
if trans or x or y:
self.groupmat.append(Transform(self.groupmat[-1]) @ mat)
# get referenced node
refid = node.get("xlink:href")
refnode = self.svg.getElementById(refid[1:])
if refnode is not None:
if isinstance(refnode, Group):
self.process_group(refnode)
elif isinstance(refnode, Use):
self.process_clone(refnode)
else:
self.process_shape(refnode, self.groupmat[-1])
# pop transform
if trans or x or y:
self.groupmat.pop()
def process_group(self, group):
"""Process group elements"""
if isinstance(group, Layer):
# style = group.style
# if (
# style("display") == "none"
# and self.options.layer_option
# and self.options.layer_option == "visible"
# ):
# return
layer = group.label
# if self.options.layer_name and self.options.layer_option == "name":
# if not layer.lower() in self.options.layer_name:
# return
# layer = layer.replace(" ", "_")
# if layer in self.layers:
self.layer = layer
block_def = self.dxf.blocks.new(str(uuid4()))
trans = group.get("transform")
insert_point = []
if trans:
self.groupmat.append(Transform(self.groupmat[-1]) @ Transform(trans))
for node in group:
try:
if isinstance(node, Group):
self.process_group(node)
elif isinstance(node, Use):
self.process_clone(node)
else:
if not insert_point:
insert_point = get_insert_point(node, self.groupmat[-1])
self.process_shape(node, self.groupmat[-1], block_def, insert_point)
except RecursionError as e:
raise inkex.AbortExtension(
_(
'Too many nested groups. Please use the "Deep Ungroup" extension first.'
)
) from e # pylint: disable=line-too-long
if trans:
self.groupmat.pop()
inkex.utils.debug(insert_point)
if insert_point:
inkex.utils.debug(block_def.name)
self.msp.add_blockref(
name=block_def.name,
insert=insert_point,
dxfattribs={"layer": self.layer}
)
def save(self, stream):
# # Warn user if name match field is empty
# if (
# self.options.layer_option
# and self.options.layer_option == "name"
# and not self.options.layer_name
# ):
# return inkex.errormsg(
# _(
# "Error: Field 'Layer match name' must be filled when using "
# "'By name match' option"
# )
# )
# if len(self.svg.xpath("//svg:use|//svg:flowRoot|//svg:text")) > 0:
# self.preprocess(["flowRoot", "text"])
# # Create layers from IfcClasses
# # Split user layer data into a list: "layerA,layerb,LAYERC" becomes ["layera", "layerb", "layerc"]
# if self.options.layer_name:
# self.options.layer_name = self.options.layer_name.lower().split(",")
# # References: Minimum Requirements for Creating a DXF File of a 3D Model By Paul Bourke
# # NURB Curves: A Guide for the Uninitiated By Philip J. Schneider
# # The NURBS Book By Les Piegl and Wayne Tiller (Springer, 1995)
# # self.dxf_add("999\nDXF created by Inkscape\n") # Some programs do not take comments in DXF files (KLayout 0.21.12 for example)
# if self.options.unit_from_document:
# unit = self.svg.document_unit
# else:
# unit = self.options.units
# with open(self.get_resource("dxf14_header.txt"), "r") as fhl:
# header = fhl.read()
# unit_map = {"px": 0, "in": 1, "ft": 2, "mm": 4, "cm": 5, "m": 6}
# header = header.replace("<unit specifier>", str(unit_map.get(unit, 0)))
# self.dxf_add(header)
# for node in self.svg.xpath("//svg:g"):
# if isinstance(node, Layer):
# layer = node.label
# self.layernames.append(layer.lower())
# if (
# self.options.layer_name
# and self.options.layer_option
# and self.options.layer_option == "name"
# and not layer.lower() in self.options.layer_name
# ):
# continue
# layer = layer.replace(" ", "_")
# if layer and layer not in self.layers:
# self.layers.append(layer)
# self.dxf_add(
# " 2\nLAYER\n 5\n2\n100\nAcDbSymbolTable\n 70\n%s\n" % len(self.layers)
# )
# for i in range(len(self.layers)):
# self.dxf_add(
# " 0\nLAYER\n 5\n%x\n100\nAcDbSymbolTableRecord\n100\nAcDbLayerTableRecord\n 2\n%s\n 70\n0\n 6\nCONTINUOUS\n"
# % (i + 80, self.layers[i])
# )
# with open(self.get_resource("dxf14_style.txt"), "r") as fhl:
# self.dxf_add(fhl.read())
# # Set toplevel transform
scale = self.svg.inkscape_scale
self.groupmat = [
[[scale, 0.0, 0.0], [0.0, -scale, self.svg.viewbox_height * scale]]
]
# self.process_group(self.svg)
# if self.options.ROBO:
# self.ROBO_output()
# if self.options.POLY:
# self.LWPOLY_output()
# with open(self.get_resource("dxf14_footer.txt"), "r") as fhl:
# self.dxf_add(fhl.read())
# # Warn user if layer data seems wrong
# if (
# self.options.layer_name
# and self.options.layer_option
# and self.options.layer_option == "name"
# ):
# for layer in self.options.layer_name:
# if layer not in self.layernames:
# inkex.errormsg(_("Warning: Layer '{}' not found!").format(layer))
self.dxf = ezdxf.new()
self.msp = self.dxf.modelspace()
self.svg = class2layer(self, self.svg)
self.process_group(self.svg)
stream.write(to_binary_data(self.dxf))
if __name__ == "__main__":
EzDxfExporter().run()