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# SVGcode 0.2
# Converts SVG paths to g-code
# (c) 2018 - Tomas 'Harvie' Mudrunka
# https://github.com/harvie
# License: GPLv2+
# Usage:
# svgcode = SVGcode('./image.svg')
# for path in svgcode.get_gcode():
# print(path['id'])
# print(path['path'])
import numpy
from svgelements import SVG, Path, Move, Shape, Line, Close, Arc
class SVGcode:
def __init__(self, filepath=None):
self._filepath = filepath
def path2gcode(self, path, samples_per_unit=100, d=4):
gcode = []
if isinstance(path, str):
path = Path(path)
def rv(v):
return ('%*f' % (d, round(v, d))).rstrip("0").rstrip(".")
for segment in path:
subdiv=max(1, round(segment.length(error=1e-5) * samples_per_unit))
if isinstance(segment, Move):
gcode.append('G0 X%s Y%s' % (rv(segment.end.x), rv(-segment.end.y)))
elif isinstance(segment, (Line, Close)):
gcode.append('G1 X%s Y%s' % (rv(segment.end.x), rv(-segment.end.y)))
elif isinstance(segment, Arc) and abs(segment.rx - segment.ry) < 1e-9:
# Strictly speaking, svg arcs can be non circular, whereas gcode only permits circular arcs.
garc = "G02" if segment.sweep > 0 else "G03"
gcode.append('%s X%s Y%s R%s' % (garc,
rv(segment.end.x),
rv(-segment.end.y),
rv(segment.rx)))
else: # Non-circular arc, Cubic or Quad Bezier Curves.
subdiv_points = numpy.linspace(0, 1, subdiv, endpoint=True)[1:]
points = segment.npoint(subdiv_points) # numpy accelerated point() call
gcode.extend(['G1 X%s Y%s' % (rv(sp[0]), rv(-sp[1])) for sp in points])
return '\n'.join(gcode)
def get_gcode(self, scale=1.0/96.0, samples_per_unit=100, digits=4, ppi=96.0):
"""
Parse gcode from an SVG file.
scale: unit scaling between svg pixels and desired units. 1.0/96.0 is inches.
subdivratio: How many subdivisions per unit? 1/100th inch steps.
digits: How many digits of gcode accuracy.
ppi: pixels per inch of the file being loaded. 96 is standard.
"""
gcode = []
transform = "scale(%g)" % scale if scale != 1.0 else None
svg = SVG.parse(self._filepath, reify=False, ppi=ppi, transform=transform)
for element in svg.elements():
if isinstance(element, Shape):
if not isinstance(element, Path):
element = Path(element)
gcode.append({'id': element.id, 'path': self.path2gcode(element.reify(), samples_per_unit, digits)})
return gcode
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