FabLab_Chemnitz/mightyscape-1.1-deprecated
FabLab_Chemnitz/mightyscape-1.1-deprecated
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mightyscape-1.1-deprecated/extensions/fablabchemnitz/laser_check/laser_check.py

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#!/usr/bin/env python3
import inkex
from inkex.bezier import csplength, csparea
from lxml import etree
import re
import math
class LaserCheck(inkex.EffectExtension):
'''
check for old styles which should be upgraded
'''
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def add_arguments(self, pars):
pars.add_argument('--tab')
pars.add_argument('--checks', default="check_all")
pars.add_argument('--bbox', type=inkex.Boolean, default=False)
pars.add_argument('--bbox_offset', type=float, default=5.000)
pars.add_argument('--groups_and_layers', type=inkex.Boolean, default=False)
pars.add_argument('--clones', type=inkex.Boolean, default=False)
pars.add_argument('--clippaths', type=inkex.Boolean, default=False)
pars.add_argument('--images', type=inkex.Boolean, default=False)
pars.add_argument('--texts', type=inkex.Boolean, default=False)
pars.add_argument('--lowlevelstrokes', type=inkex.Boolean, default=False)
pars.add_argument('--stroke_colors', type=inkex.Boolean, default=False)
pars.add_argument('--stroke_widths', type=inkex.Boolean, default=False)
pars.add_argument('--stroke_opacities', type=inkex.Boolean, default=False)
pars.add_argument('--cosmestic_dashes', type=inkex.Boolean, default=False)
pars.add_argument('--invisible_shapes', type=inkex.Boolean, default=False)
pars.add_argument('--pointy_paths', type=inkex.Boolean, default=False)
pars.add_argument('--transformations', type=inkex.Boolean, default=False)
pars.add_argument('--short_paths', type=inkex.Boolean, default=False)
pars.add_argument('--short_paths_min', type=float, default=1.000)
pars.add_argument('--non_path_shapes', type=inkex.Boolean, default=False)
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def effect(self):
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so = self.options
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def parseChildren(element):
if element not in selected:
selected.append(element)
children = element.getchildren()
if children is not None:
for child in children:
if child not in selected:
selected.append(child)
parseChildren(child) #go deeper and deeper
#check if we have selected elements or if we should parse the whole document instead
selected = [] #total list of elements to parse
if len(self.svg.selected) == 0:
for element in self.document.getroot().iter(tag=etree.Element):
if element != self.document.getroot():
selected.append(element)
else:
for element in self.svg.selected.values():
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parseChildren(element)
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namedView = self.document.getroot().find(inkex.addNS('namedview', 'sodipodi'))
doc_units = namedView.get(inkex.addNS('document-units', 'inkscape'))
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pagecolor = namedView.get('pagecolor')
inkex.utils.debug("---------- Default checks")
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inkex.utils.debug("Document units: {}".format(doc_units))
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'''
The SVG format is highly complex and offers a lot of possibilities. Most things of SVG we do not
need for a laser cutter. Usually we need svg:path and maybe svg:image; we can drop a lot of stuff
like svg:defs, svg:desc, gradients, etc.
'''
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nonShapes = []
shapes = []
for element in selected:
if not isinstance(element, inkex.ShapeElement):
nonShapes.append(element)
else:
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shapes.append(element)
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inkex.utils.debug("{} shape elements in total".format(len(shapes)))
inkex.utils.debug("{} non-shape elements in total".format(len(nonShapes)))
for nonShape in nonShapes:
inkex.utils.debug("non-shape id={}".format(nonShape.get('id')))
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if so.checks == "check_all" or so.groups_and_layers is True:
inkex.utils.debug("\n---------- Groups and layers")
groups = []
layers = []
for element in selected:
if element.tag == inkex.addNS('g','svg'):
if element.get('inkscape:groupmode') == 'layer':
layers.append(element)
else:
groups.append(element)
inkex.utils.debug("{} groups in total".format(len(groups)))
inkex.utils.debug("{} layers in total".format(len(layers)))
#check for empty groups
for group in groups:
if len(group) == 0:
inkex.utils.debug("id={} is empty group".format(group.get('id')))
#check for empty layers
for layer in layers:
if len(layer) == 0:
inkex.utils.debug("id={} is empty layer".format(layer.get('id')))
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'''
Clones should be unlinked because they cause similar issues like transformations
'''
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if so.checks == "check_all" or so.clones is True:
inkex.utils.debug("\n---------- Clones (svg:use) - maybe unlink")
uses = []
for element in selected:
if element.tag == inkex.addNS('use','svg'):
uses.append(element)
inkex.utils.debug("{} svg:use clones in total".format(len(uses)))
for use in uses:
inkex.utils.debug("id={}".format(use.get('id')))
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'''
Clip paths are neat to visualize things, but they do not perform a real path cutting.
Please perform real intersections to have an intact target geometry.
'''
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if so.checks == "check_all" or so.clippaths is True:
inkex.utils.debug("\n---------- Clippings (svg:clipPath) - please replace with real cut paths")
clipPaths = []
for element in selected:
if element.tag == inkex.addNS('clipPath','svg'):
clipPaths.append(element)
inkex.utils.debug("{} svg:clipPath in total".format(len(clipPaths)))
for clipPath in clipPaths:
inkex.utils.debug("id={}".format(clipPath.get('id')))
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'''
Sometimes images look like vector but they are'nt. In case you dont want to perform engraving, either
check to drop or trace to vector paths
'''
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if so.checks == "check_all" or so.images is True:
inkex.utils.debug("\n---------- Images (svg:image) - maybe trace to svg")
images = []
for element in selected:
if element.tag == inkex.addNS('image','svg'):
images.append(element)
inkex.utils.debug("{} svg:image in total".format(len(images)))
for image in images:
inkex.utils.debug("image id={}".format(image.get('id')))
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'''
Low level strokes cannot be properly edited in Inkscape (no node handles). Converting helps
'''
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if so.checks == "check_all" or so.lowlevelstrokes is True:
inkex.utils.debug("\n---------- Low level strokes (svg:line/polyline/polygon) - maybe convert to path")
lowlevels = []
for element in selected:
if element.tag in (inkex.addNS('line','svg'), inkex.addNS('polyline','svg'), inkex.addNS('polygon','svg')):
lowlevels.append(element)
inkex.utils.debug("{} low level strokes in total".format(len(lowlevels)))
for lowlevel in lowlevels:
inkex.utils.debug("id={}".format(lowlevel.get('id')))
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'''
Texts cause problems when sharing with other people. You must ensure that everyone has the
font files installed you used. Convert to paths avoids this issue and guarantees same result
everywhere.
'''
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if so.checks == "check_all" or so.texts is True:
inkex.utils.debug("\n---------- Texts (should be converted to paths)")
texts = []
for element in selected:
if element.tag == inkex.addNS('text','svg'):
texts.append(element)
inkex.utils.debug("{} svg:text in total".format(len(texts)))
for text in texts:
inkex.utils.debug("id={}".format(text.get('id')))
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'''
The more stroke colors the more laser job configuration is required. Reduce the SVG file
to a minimum of stroke colors to be quicker
'''
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if so.checks == "check_all" or so.stroke_colors is True:
inkex.utils.debug("\n---------- Stroke colors")
strokeColors = []
for element in shapes:
style = element.get('style')
if style is not None:
stroke = re.search('(;|^)stroke:(.*?)(;|$)', style)
if stroke is not None:
strokeColor = stroke[0].split("stroke:")[1].split(";")[0]
if strokeColor not in strokeColors:
strokeColors.append(strokeColor)
inkex.utils.debug("{} different stroke colors in total".format(len(strokeColors)))
for strokeColor in strokeColors:
inkex.utils.debug("stroke color {}".format(strokeColor))
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'''
Nearly each laser job needs a bit of border to place the material inside the laser. Often
we have to fixate on vector grid, pin grid or task plate. Thus we need tapes or pins. So we
leave some borders off the actual part geometries.
'''
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if so.checks == "check_all" or so.bbox is True:
inkex.utils.debug("\n---------- Borders around all elements - minimum offset {} mm from each side".format(so.bbox_offset))
bbox = inkex.BoundingBox()
for element in self.document.getroot().iter(tag=etree.Element):
if element != self.document.getroot() and isinstance(element, inkex.ShapeElement) and element.tag != inkex.addNS('use','svg') and element.get('inkscape:groupmode') != 'layer': #bbox fails for svg:use elements and layers
transform = inkex.Transform()
parent = element.getparent()
if parent is not None and isinstance(parent, inkex.ShapeElement):
transform = parent.composed_transform()
try:
bbox += element.bounding_box(transform)
except Exception:
transform = element.composed_transform()
x1, y1 = transform.apply_to_point([0, 0])
x2, y2 = transform.apply_to_point([1, 1])
bbox += inkex.BoundingBox((x1, x2), (y1, y2))
if abs(bbox.width) == math.inf or abs(bbox.height) == math.inf:
inkex.utils.debug("bounding box could not be calculated")
#else:
# inkex.utils.debug("bounding box is {}".format(bbox))
page_width = self.svg.unittouu(self.document.getroot().attrib['width'])
width_height = self.svg.unittouu(self.document.getroot().attrib['height'])
fmm = self.svg.unittouu(str(so.bbox_offset) + "mm")
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if bbox.left >= fmm:
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inkex.utils.debug("left border... ok")
else:
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inkex.utils.debug("left border... fail: {:0.3f} mm".format(self.svg.uutounit(bbox.left, "mm")))
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if bbox.top >= fmm:
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inkex.utils.debug("top border... ok")
else:
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inkex.utils.debug("top border... fail: {:0.3f} mm".format(self.svg.uutounit(bbox.top, "mm")))
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if bbox.right + fmm <= page_width:
inkex.utils.debug("right border... ok")
else:
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inkex.utils.debug("right border... fail: {:0.3f} mm".format(self.svg.uutounit(bbox.right, "mm")))
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if bbox.bottom + fmm <= width_height:
inkex.utils.debug("bottom border... ok")
else:
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inkex.utils.debug("bottom border... fail: {:0.3f} mm".format(self.svg.uutounit(bbox.bottom, "mm")))
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'''
Different stroke widths might behave the same like different stroke colors. Reduce to a minimum set.
Ideally all stroke widths are set to 1 pixel.
'''
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if so.checks == "check_all" or so.stroke_widths is True:
inkex.utils.debug("\n---------- Stroke widths")
strokeWidths = []
for element in shapes:
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style = element.get('style')
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if style is not None:
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stroke_width = re.search('stroke-width:(.*?)(;|$)', style)
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if stroke_width is not None:
strokeWidth = self.svg.unittouu(stroke_width[0].split("stroke-width:")[1].split(";")[0])
if strokeWidth not in strokeWidths:
strokeWidths.append(strokeWidth)
inkex.utils.debug("{} different stroke widths in total".format(len(strokeWidths)))
for strokeWidth in strokeWidths:
inkex.utils.debug("stroke width {}".format(strokeWidth))
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'''
Cosmetic dashes cause simulation issues and are no real cut paths. It's similar to the thing
with clip paths. Please convert lines to real dash segments if you want to laser them.
'''
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if so.checks == "check_all" or so.cosmestic_dashes is True:
inkex.utils.debug("\n---------- Cosmetic dashes - should be converted to paths")
strokeDasharrays = []
for element in shapes:
style = element.get('style')
if style is not None:
stroke_dasharray = re.search('stroke-dasharray:(.*?)(;|$)', style)
if stroke_dasharray is not None:
strokeDasharray = stroke_dasharray[0].split("stroke-dasharray:")[1].split(";")[0]
if strokeDasharray not in strokeDasharrays:
strokeDasharrays.append(strokeDasharray)
inkex.utils.debug("{} different stroke dash arrays in total".format(len(strokeDasharrays)))
for strokeDasharray in strokeDasharrays:
inkex.utils.debug("stroke dash array {}".format(strokeDasharray))
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'''
Shapes/paths with the same color like the background, 0% opacity, etc. lead to strange
laser cutting results, like duplicated edges, enlarged laser times and more. Please double
check for such occurences.
'''
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if so.checks == "check_all" or so.invisible_shapes is True:
inkex.utils.debug("\n---------- Invisible shapes")
invisibles = []
for element in shapes:
if element.tag not in (inkex.addNS('tspan','svg')):
style = element.get('style')
if style is not None:
stroke = re.search('stroke:(.*?)(;|$)', style) #filter white on white (we guess the background color of the document is white too but we do not check)
if stroke is None:
strokeVis = 0
elif stroke[0].split("stroke:")[1].split(";")[0] == 'none':
strokeVis = 0
elif stroke[0].split("stroke:")[1].split(";")[0] in ('#ffffff', 'white', 'rgb(255,255,255)'):
strokeVis = 0
else:
strokeVis = 1
stroke_width = re.search('stroke-width:(.*?)(;|$)', style)
if stroke_width is None:
widthVis = 0
elif self.svg.unittouu(stroke_width[0].split("stroke-width:")[1].split(";")[0]) < 0.005: #really thin (0,005pc = 0,080px)
widthVis = 0
else:
widthVis = 1
stroke_opacity = re.search('stroke-opacity:(.*?)(;|$)', style)
if stroke_opacity is None:
strokeOpacityVis = 0
elif float(stroke_opacity[0].split("stroke-opacity:")[1].split(";")[0]) < 0.05: #nearly invisible (<5% opacity)
strokeOpacityVis = 0
else:
strokeOpacityVis = 1
if pagecolor == '#ffffff':
invisColors = [pagecolor, 'white', 'rgb(255,255,255)']
else:
invisColors = [pagecolor] #we could add some parser to convert pagecolor to rgb/hsl/cmyk
fill = re.search('fill:(.*?)(;|$)', style)
if fill is None:
fillVis = 0
elif fill[0].split("fill:")[1].split(";")[0] == 'none':
fillVis = 0
elif fill[0].split("fill:")[1].split(";")[0] in invisColors:
fillVis = 0
else:
fillVis = 1
fill_opacity = re.search('fill-opacity:(.*?)(;|$)', style)
if fill_opacity is None:
fillOpacityVis = 0
elif float(fill_opacity[0].split("fill-opacity:")[1].split(";")[0]) < 0.05: #nearly invisible (<5% opacity)
fillOpacityVis = 0
else:
fillOpacityVis = 1
#inkex.utils.debug("strokeVis={}, widthVis={}, strokeOpacityVis={}, fillVis={}, fillOpacityVis={}".format(strokeVis, widthVis, strokeOpacityVis, fillVis, fillOpacityVis))
if (strokeVis == 0 or widthVis == 0 or strokeOpacityVis == 0) and (fillVis == 0 or fillOpacityVis == 0):
if element not in invisibles:
invisibles.append(element)
inkex.utils.debug("{} invisible shapes in total".format(len(invisibles)))
for invisible in invisibles:
inkex.utils.debug("id={}".format(invisible.get('id')))
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'''
Additionally, stroke opacities less than 1.0 cause problems in most laser softwares. Please
adjust all strokes to use full opacity.
'''
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if so.checks == "check_all" or so.stroke_opacities is True:
inkex.utils.debug("\n---------- Objects with stroke transparencies < 1.0 - should be set to 1.0")
transparencies = []
for element in shapes:
style = element.get('style')
if style is not None:
stroke_opacity = re.search('stroke-opacity:(.*?)(;|$)', style)
if stroke_opacity is not None:
if float(stroke_opacity[0].split("stroke-opacity:")[1].split(";")[0]) < 1.0:
if element not in transparencies:
transparencies.append(element)
inkex.utils.debug("{} objects with stroke transparencies < 1.0 in total".format(len(transparencies)))
for transparency in transparencies:
inkex.utils.debug("id={}".format(transparency.get('id')))
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'''
We look for paths which are just points. Those are useless in case of lasercutting.
Note: this scan only works for paths, not for subpaths. If so, you need to break apart before
'''
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if so.checks == "check_all" or so.pointy_paths is True:
inkex.utils.debug("\n---------- Pointy paths - should be deleted")
pointyPaths = []
for element in shapes:
if isinstance(element, inkex.PathElement):
p = element.path
commandsCoords = p.to_arrays()
if len(commandsCoords) == 1 or \
(len(commandsCoords) == 2 and commandsCoords[0][1] == commandsCoords[1][1]) or \
(len(commandsCoords) == 2 and commandsCoords[-1][0] == 'Z') or \
(len(commandsCoords) == 3 and commandsCoords[0][1] == commandsCoords[1][1] and commandsCoords[2][1] == 'Z'):
pointyPaths.append(element)
inkex.utils.debug("{} pointy paths in total".format(len(pointyPaths)))
for pointyPath in pointyPaths:
inkex.utils.debug("id={}".format(pointyPath.get('id')))
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'''
Transformations often lead to wrong stroke widths or mis-rendering in end software. The best we
can do with a final SVG is to remove all relative translations, rotations and scalings. We should
apply absolute coordinates only.
'''
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if so.checks == "check_all" or so.transformations is True:
inkex.utils.debug("\n---------- Transformations - should be applied to absolute")
transformations = []
for element in shapes:
if element.get('transform') is not None:
transformations.append(element)
inkex.utils.debug("{} transformation in total".format(len(transformations)))
for transformation in transformations:
inkex.utils.debug("transformation in id={}".format(transformation.get('id')))
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'''
Really short paths can cause issues with laser cutter mechanics and should be avoided to
have healthier stepper motor belts, etc.
'''
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if so.checks == "check_all" or so.short_paths is True:
inkex.utils.debug("\n---------- Short paths (< {} mm)".format(so.short_paths_min))
shortPaths = []
totalLength = 0
totalDropLength = 0
for element in shapes:
if isinstance(element, inkex.PathElement):
slengths, stotal = csplength(element.path.transform(element.composed_transform()).to_superpath())
totalLength += stotal
if stotal < self.svg.unittouu(str(so.short_paths_min) + "mm"):
shortPaths.append(element)
totalDropLength += stotal
inkex.utils.debug("{} short paths in total".format(len(shortPaths)))
if totalLength > 0:
inkex.utils.debug("{:0.2f}% of total ({:0.2f} mm /{:0.2f} mm)".format(totalDropLength / totalLength, totalDropLength, totalLength))
for shortPath in shortPaths:
inkex.utils.debug("id={}".format(shortPath.get('id')))
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'''
Shapes like rectangles, ellipses, arcs, spirals should be converted to svg:path to have more
convenience in the file
'''
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if so.checks == "check_all" or so.non_path_shapes is True:
inkex.utils.debug("\n---------- Non-path shapes - should be converted to paths")
nonPathShapes = []
for element in shapes:
if not isinstance(element, inkex.PathElement) and not isinstance(element, inkex.Group):
nonPathShapes.append(element)
inkex.utils.debug("{} non-path shapes in total".format(len(nonPathShapes)))
for nonPathShape in nonPathShapes:
inkex.utils.debug("id={}".format(nonPathShape.get('id')))
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exit(0)
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if __name__ == '__main__':
LaserCheck().run()
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