FabLab_Chemnitz/mightyscape-1.1-deprecated
FabLab_Chemnitz/mightyscape-1.1-deprecated
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fc012a2896
mightyscape-1.1-deprecated/extensions/fablabchemnitz_input_stl.py
Mario Voigt fc012a2896 Initial commit
2020-07-30 01:16:18 +02:00

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#!/usr/bin/env python3
# input-stl.py
# (C) 2018 Juergen Weigert <juergen@fabmail.org>, distribute under GPLv2 or ask
#
# This is an input extension for inkscape to read STL files.
#
# Requires: (python-lxml | python3-lxml), slic3r
# For optional(!) rotation support:
# Requires: (python-numpy-stl | python3-numpy-stl)
# If you get ImportError: cannot import name 'mesh'
# although an stl module is installed, then you have the wrong stl module.
# Try 'pip3 uninstall stl; pip3 install numpy-stl'
#
# 2018-12-22 jw, v0.1 Initial draught
# v0.1 First working standalone tool.
# 2018-12-26 jw, v0.3 Mesh rotation support via numpy-stl. Fully optional.
# v0.4 Works fine as an inkscape input extension under Linux.
# 2019-03-01 jw, v0.5 numbers and center option added.
# 2019-07-17 jw, v0.6 fixed ry rotation.
#
# FIXME: should use svg_pathstats(path_d): to compute bounding boxes.
from __future__ import print_function
import sys, os, re, argparse
import subprocess, tempfile
from lxml import etree
from subprocess import Popen, PIPE
_version = '0.6'
sys_platform = sys.platform.lower()
if sys_platform.startswith('win'):
slic3r = 'slic3r-console.exe'
elif sys_platform.startswith('darwin'):
slic3r = 'slic3r'
else: # Linux
slic3r = os.environ['HOME']+ '/Downloads/Slic3r-1.3.0-x86_64.AppImage'
if not os.path.exists(slic3r):
slic3r = 'slic3r'
parser = argparse.ArgumentParser(description='convert an STL file to a nice SVG for inkscape. The STL object is projected onto the X-Y plane.')
parser.add_argument('-l', '--layer_height', default=None, help='slic3r layer height, probably in mm. Default: per slic3r config')
parser.add_argument('--rx', default=None, type=float, help='Rotate STL object around X-Axis before importing.')
parser.add_argument('--ry', default=None, type=float, help='Rotate STL object around Y-Axis before importing.')
parser.add_argument('--numbers', default='false', help='Add layer numbers.')
parser.add_argument('--center', default='false', help='Add center marks.')
parser.add_argument('--stdout', '--tab', default=None, help=argparse.SUPPRESS)
parser.add_argument('-s', '--slic3r-cmd', '--slic3r_cmd', default=slic3r, help='Command to invoke slic3r. Default is "'+slic3r+'"')
parser.add_argument('-o', '--output', default=None, help='SVG output file name or "-" for stdout. Default: Name derived from STL input.')
parser.add_argument('stlfile', help='STL input file to convert to SVG with the same name, but ".svg" suffix.')
args = parser.parse_args()
# input-stl.inx advertises use of '$HOME' -- windows has HOMEPATH instead of HOME
home = os.environ.get('HOME', os.environ.get('HOMEPATH', 'NO-HOME'))
#args.slic3r_cmd = re.sub('^\$HOME(PATH)?', home, args.slic3r_cmd)
if sys_platform.startswith('win'):
# assert we run the commandline version of slic3r
args.slic3r_cmd = re.sub('slic3r(\.exe)?$', 'slic3r-console.exe', args.slic3r_cmd, flags=re.I)
stlfile = args.stlfile
tmpstlfile = None
if args.rx is not None and abs(args.rx) < 0.01: args.rx = None
if args.ry is not None and abs(args.ry) < 0.01: args.ry = None
if args.rx or args.ry:
try:
import numpy, stl, math
mesh = stl.Mesh.from_file(stlfile)
if args.rx: mesh.rotate([1.0, 0.0, 0.0], math.radians(float(args.rx)))
if args.ry: mesh.rotate([0.0, 1.0, 0.0], math.radians(float(args.ry)))
stlfile = tmpstlfile = tempfile.gettempdir() + os.path.sep + 'ink-stl-' + str(os.getpid()) + '.stl'
mesh.save(stlfile)
except Exception as e:
print("Rotate failed: " + str(e), file=sys.stderr)
if args.output == '-': args.stdout = True
if args.stdout:
svgfile = tempfile.gettempdir() + os.path.sep + 'ink-stl-' + str(os.getpid()) + '.svg'
else:
svgfile = re.sub('\.stl', '.svg', args.stlfile, flags=re.IGNORECASE)
if args.output is not None: svgfile = args.output
cmd = [args.slic3r_cmd, '--version']
try:
proc = subprocess.Popen(cmd, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
except OSError as e:
if args.stdout:
hint="Check your slic3r command setting in the second tab of the STL Input dialog."
else:
hint="Maybe use --slic3r-cmd option?"
print("{0}\nCommand failed: errno={1} {2}\n\n{3}".format(' '.join(cmd), e.errno, e.strerror, hint), file=sys.stderr)
sys.exit(1)
stdout, stderr = proc.communicate()
# option --layer-height does not work. We use --scale instead...
scale = 1/float(args.layer_height)
cmd = [args.slic3r_cmd, '--no-gui']
if args.layer_height is not None:
cmd += ['--scale', str(scale), '--first-layer-height', '0.1mm'] # args.layer_height+'mm']
cmd += ['--export-svg', '-o', svgfile, stlfile]
magic = 10 # layer width seems to be 0.1mm ???
def scale_points(pts, scale):
""" str='276.422496,309.4 260.209984,309.4 260.209984,209.03 276.422496,209.03'
"""
return re.sub('\d*\.\d*', lambda x: str(float(x.group(0))*scale*magic), pts)
## CAUTION: keep svg_pathstats() in sync with inkscape-centerlinetrace
def svg_pathstats(path_d):
""" calculate statistics from an svg path:
length (measuring bezier splines as straight lines through the handles).
points (all, including duplicates)
segments (number of not-connected!) path segments.
simple bounding box (ignoring curves of splines, but inclding handles.)
"""
xmin = 1e99
ymin = 1e99
xmax = -1e99
ymax = -1e99
p_points = 0
p_length = 0
p_segments = 0
path_d = path_d.lower()
for p in path_d.split('m'):
pp = re.sub('[cl,]', ' ', p)
pp,closed = re.subn('z\s*$','',pp)
xy = pp.split()
if len(xy) < 2:
# print len(pp)
# print "short path error"
continue
x0 = float(xy[0])
y0 = float(xy[1])
if x0 > xmax: xmax = x0
if x0 < xmin: xmin = x0
if y0 > ymax: ymax = y0
if y0 < ymin: ymin = y0
p_points += 1
x = xy[2::2]
y = xy[3::2]
if len(x):
p_segments += 1
if closed:
x.extend(x0)
y.extend(y0)
for i in range(len(x)):
p_points += 1
dx = float(x[i]) - x0
dy = float(y[i]) - y0
p_length += math.sqrt( dx * dx + dy * dy )
x0,y0 = float(x[i]),float(y[i])
if x0 > xmax: xmax = x0
if x0 < xmin: xmin = x0
if y0 > ymax: ymax = y0
if y0 < ymin: ymin = y0
return { 'points':p_points, 'segments':p_segments, 'length':p_length, 'bbox': (xmin,ymin, xmax, ymax) }
def bbox_info(slic3r, file):
cmd = [ slic3r, '--no-gui', '--info', file ]
p = Popen(cmd, stdout=PIPE, stderr=PIPE)
out, err = p.communicate()
if len(err):
raise ValueError(err)
bb = {}
for l in out.decode().split("\n"):
m = re.match('((min|max)_[xyz])\s*=\s*(.*)', l)
if m: bb[m.group(1)] = float(m.group(3))
if (len(bb) != 6):
raise ValueError("slic3r --info did not return 6 elements for bbox")
return bb
if args.center != 'false':
bb = bbox_info(args.slic3r_cmd, stlfile)
# Ouch: bbox info gives us stl coordinates. slic3r translates them into svg px using 75dpi.
cx = (-bb['min_x'] + bb['max_x']) * 0.5 * 1/scale * magic * 25.4 / 75
cy = (-bb['min_y'] + bb['max_y']) * 0.5 * 1/scale * magic * 25.4 / 75
# print(cx, cy, file=sys.stderr)
try:
if args.stdout:
tty = open("/dev/tty", "w")
else:
tty = sys.stderr
except:
tty = sys.stderr
try:
proc = subprocess.Popen(cmd, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
except OSError as e:
raise OSError("{0}\nCommand failed: errno={1} {2}".format(' '.join(cmd), e.errno, e.strerror))
stdout, stderr = proc.communicate()
if tmpstlfile and os.path.exists(tmpstlfile):
os.unlink(tmpstlfile)
if not b'Done.' in stdout:
print("Command failed: {0}".format(' '.join(cmd)))
print("OUT: " + str(stdout), file=sys.stderr)
print("ERR: " + str(stderr), file=sys.stderr)
sys.exit(1)
# slic3r produces correct svg files, but with polygons instead of paths, and with undefined strokes.
# When opened with inkscape, most lines are invisible and polygons cannot be edited.
# To fix these issues, we postprocess the svg file:
# * replace polygon nodes with corresponding path nodes.
# * replace style attribute in polygon nodes with one that has a black stroke
stream = open(svgfile, 'r')
p = etree.XMLParser(huge_tree=True)
doc = etree.parse(stream, parser=p)
stream.close()
doc.getroot().addprevious(etree.Comment(' Imported with '+sys.argv[0]+' V'+_version+" by Juergen Weigert "))
doc.getroot().attrib['{http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd}docname'] = 'input-stl.svg'
## To change the document units to mm, insert directly after the root node:
# e.tag = '{http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd}namedview'
# e.attrib['id'] = "base"
# e.attrib['{http://www.inkscape.org/namespaces/inkscape}document-units'] = "mm"
layercount = 0
for e in doc.iterfind('//{*}g'):
if e.attrib['{http://slic3r.org/namespaces/slic3r}z'] and e.attrib['id']:
e.attrib['{http://www.inkscape.org/namespaces/inkscape}label'] = e.attrib['id'] + ' slic3r:z=' + e.attrib['{http://slic3r.org/namespaces/slic3r}z']
del e.attrib['{http://slic3r.org/namespaces/slic3r}z']
# for some fun with our inkscape-paths2openscad extension, add sibling to e:
# <svg:desc id="descpoly60">Depth: 1mm\nOffset: 31mm</svg:desc>
desc = etree.Element('{http://www.w3.org/2000/svg}desc')
desc.attrib['id'] = 'descl'+str(layercount)
desc.text = "Depth: %.2fmm\nRaise: %.2fmm\n" % (1/scale, layercount/scale)
e.append(desc)
layercount+=1
if args.numbers != 'false':
num = etree.Element('{http://www.w3.org/2000/svg}text')
num.attrib['id'] = 'textnum'+str(layercount)
num.attrib['x'] = str(layercount*2)
num.attrib['y'] = str(layercount*4+10)
num.attrib['style'] = 'fill:#00FF00;fill-opacity:1;stroke:#00FF00;font-family:FreeSans;font-size:10pt;stroke-opacity:1;stroke-width:0.1'
num.text = "%d" % layercount
e.append(num)
if args.center != 'false':
cc = etree.Element('{http://www.w3.org/2000/svg}path')
cc.attrib['id'] = 'ccross'+str(layercount)
cc.attrib['style'] = 'fill:none;fill-opacity:1;stroke:#0000FF;font-family:FreeSans;font-size:10pt;stroke-opacity:1;stroke-width:0.1'
cc.attrib['d'] = 'M %s,%s v 10 M %s,%s h 10 M %s,%s h 4' % (cx, cy-5, cx-5, cy, cx-2, cy+5)
e.append(cc)
polygoncount = 0
for e in doc.iterfind('//{*}polygon'):
# e.tag = '{http://www.w3.org/2000/svg}polygon'
# e.attrib = {'{http://slic3r.org/namespaces/slic3r}type': 'contour', 'points': '276.422496,309.4 260.209984,309.4 260.209984,209.03 276.422496,209.03', 'style': 'fill: white'}
e.tag = re.sub('polygon$', 'path', e.tag)
polygoncount += 1
e.attrib['id'] = 'polygon%d' % polygoncount
e.attrib['{http://www.inkscape.org/namespaces/inkscape}connector-curvature'] = '0'
e.attrib['style'] = 'fill:none;fill-opacity:1;stroke:#FF0000;stroke-opacity:1;stroke-width:0.1'
e.attrib['d'] = 'M ' + re.sub(' ', ' L ', scale_points(e.attrib['points'], 1/scale)) + ' Z'
del e.attrib['points']
if e.attrib.get('{http://slic3r.org/namespaces/slic3r}type') == 'contour':
# remove contour, but keep all slic3r:type='hole', whatever it is worth later.
del e.attrib['{http://slic3r.org/namespaces/slic3r}type']
try:
# Available in lxml since 3.5.0
# Make an xmlns declaration in the svg header, and use the "inkscape:" prefix throughout the document.
etree.cleanup_namespaces(doc.getroot(), top_nsmap={
'inkscape': 'http://www.inkscape.org/namespaces/inkscape',
'sodipodi': 'http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd'})
except:
pass
try:
print("{0}: {1} polygons in {2} layers converted to paths.".format(svgfile, polygoncount, layercount), file=tty)
except:
pass
if args.stdout:
doc.write(sys.stdout.buffer)
else:
doc.write(svgfile, pretty_print=True)
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