Cura/slice/cura_sf/fabmetheus_utilities/geometry/manipulation_paths/bevel.py

   1 """
   2 Add material to support overhang or remove material at the overhang angle.
   3
   4 """
   5
   6 from __future__ import absolute_import
   7
   8 from fabmetheus_utilities.geometry.creation import lineation
   9 from fabmetheus_utilities.vector3 import Vector3
  10 from fabmetheus_utilities import euclidean
  11
  12
  13 __author__ = 'Enrique Perez (perez_enrique@yahoo.com)'
  14 __credits__ = 'Art of Illusion <http://www.artofillusion.org/>'
  15 __date__ = '$Date: 2008/02/05 $'
  16 __license__ = 'GNU Affero General Public License http://www.gnu.org/licenses/agpl.html'
  17
  18
  19 globalExecutionOrder = 20
  20
  21
  22 def getBevelPath( begin, center, close, end, radius ):
  23         "Get bevel path."
  24         beginComplex = begin.dropAxis()
  25         centerComplex = center.dropAxis()
  26         endComplex = end.dropAxis()
  27         beginComplexSegmentLength = abs( centerComplex - beginComplex )
  28         endComplexSegmentLength = abs( centerComplex - endComplex )
  29         minimumRadius = lineation.getMinimumRadius( beginComplexSegmentLength, endComplexSegmentLength, radius )
  30         if minimumRadius <= close:
  31                 return [ center ]
  32         beginBevel = center + minimumRadius / beginComplexSegmentLength * ( begin - center )
  33         endBevel = center + minimumRadius / endComplexSegmentLength * ( end - center )
  34         if radius > 0.0:
  35                 return [ beginBevel, endBevel ]
  36         midpointComplex = 0.5 * ( beginBevel.dropAxis() + endBevel.dropAxis() )
  37         spikeComplex = centerComplex + centerComplex - midpointComplex
  38         return [ beginBevel, Vector3( spikeComplex.real, spikeComplex.imag, center.z ), endBevel ]
  39
  40 def getManipulatedPaths(close, elementNode, loop, prefix, sideLength):
  41         "Get bevel loop."
  42         if len(loop) < 3:
  43                 return [loop]
  44         derivation = BevelDerivation(elementNode, prefix, sideLength)
  45         if derivation.radius == 0.0:
  46                 return loop
  47         bevelLoop = []
  48         for pointIndex in xrange(len(loop)):
  49                 begin = loop[(pointIndex + len(loop) - 1) % len(loop)]
  50                 center = loop[pointIndex]
  51                 end = loop[(pointIndex + 1) % len(loop)]
  52                 bevelLoop += getBevelPath(begin, center, close, end, derivation.radius)
  53         return [euclidean.getLoopWithoutCloseSequentialPoints(close, bevelLoop)]
  54
  55 def getNewDerivation(elementNode, prefix, sideLength):
  56         'Get new derivation.'
  57         return BevelDerivation(elementNode, prefix, sideLength)
  58
  59 def processElementNode(elementNode):
  60         "Process the xml element."
  61         lineation.processElementNodeByFunction(elementNode, getManipulatedPaths)
  62
  63
  64 class BevelDerivation(object):
  65         "Class to hold bevel variables."
  66         def __init__(self, elementNode, prefix, sideLength):
  67                 'Set defaults.'
  68                 self.radius = lineation.getFloatByPrefixSide(0.0, elementNode, prefix + 'radius', sideLength)