Cura/slice/cura_sf/fabmetheus_utilities/geometry/geometry_tools/path_elements/arc.py

   1 """
   2 Arc vertexes.
   3
   4 From:
   5 http://www.w3.org/TR/SVG/paths.html#PathDataEllipticalArcCommands
   6
   7 """
   8
   9 from __future__ import absolute_import
  10
  11 from fabmetheus_utilities.geometry.creation import lineation
  12 from fabmetheus_utilities.geometry.geometry_utilities import evaluate
  13 from fabmetheus_utilities.vector3 import Vector3
  14 from fabmetheus_utilities import svg_reader
  15 import math
  16
  17
  18 __author__ = 'Enrique Perez (perez_enrique@yahoo.com)'
  19 __credits__ = 'Art of Illusion <http://www.artofillusion.org/>'
  20 __date__ = '$Date: 2008/02/05 $'
  21 __license__ = 'GNU Affero General Public License http://www.gnu.org/licenses/agpl.html'
  22
  23
  24 def getArcPath(elementNode):
  25         "Get the arc path.rx ry x-axis-rotation large-arc-flag sweep-flag"
  26         begin = elementNode.getPreviousVertex(Vector3())
  27         end = evaluate.getVector3FromElementNode(elementNode)
  28         largeArcFlag = evaluate.getEvaluatedBoolean(True, elementNode, 'largeArcFlag')
  29         radius = lineation.getComplexByPrefix(elementNode, 'radius', complex(1.0, 1.0))
  30         sweepFlag = evaluate.getEvaluatedBoolean(True, elementNode, 'sweepFlag')
  31         xAxisRotation = math.radians(evaluate.getEvaluatedFloat(0.0, elementNode, 'xAxisRotation'))
  32         arcComplexes = svg_reader.getArcComplexes(begin.dropAxis(), end.dropAxis(), largeArcFlag, radius, sweepFlag, xAxisRotation)
  33         path = []
  34         if len(arcComplexes) < 1:
  35                 return []
  36         incrementZ = (end.z - begin.z) / float(len(arcComplexes))
  37         z = begin.z
  38         for pointIndex in xrange(len(arcComplexes)):
  39                 pointComplex = arcComplexes[pointIndex]
  40                 z += incrementZ
  41                 path.append(Vector3(pointComplex.real, pointComplex.imag, z))
  42         if len(path) > 0:
  43                 path[-1] = end
  44         return path
  45
  46 def processElementNode(elementNode):
  47         "Process the xml element."
  48         elementNode.parentNode.xmlObject.vertexes += getArcPath(elementNode)