def getBridgeDirection(belowLoops, layerLoops, layerThickness):
"Get span direction for the majority of the overhanging extrusion perimeter, if any."
if len(belowLoops) < 1:
return None
belowOutsetLoops = []
overhangInset = 1.875 * layerThickness
slightlyGreaterThanOverhang = 1.1 * overhangInset
for loop in belowLoops:
centers = intercircle.getCentersFromLoopDirection(
True, loop, slightlyGreaterThanOverhang)
for center in centers:
outset = intercircle.getSimplifiedInsetFromClockwiseLoop(
center, overhangInset)
if intercircle.isLargeSameDirection(outset, center, overhangInset):
belowOutsetLoops.append(outset)
bridgeRotation = complex()
for loop in layerLoops:
for pointIndex in xrange(len(loop)):
previousIndex = (pointIndex + len(loop) - 1) % len(loop)
bridgeRotation += getOverhangDirection(belowOutsetLoops,
loop[previousIndex],
loop[pointIndex])
if abs(bridgeRotation) < 0.75 * layerThickness:
return None
else:
bridgeRotation /= abs(bridgeRotation)
return cmath.sqrt(bridgeRotation)
def getBridgeDirection( belowLoops, layerLoops, layerThickness ): "Get span direction for the majority of the overhanging extrusion perimeter, if any." if len( belowLoops ) < 1: return None belowOutsetLoops = [] overhangInset = 1.875 * layerThickness slightlyGreaterThanOverhang = 1.1 * overhangInset for loop in belowLoops: centers = intercircle.getCentersFromLoopDirection( True, loop, slightlyGreaterThanOverhang ) for center in centers: outset = intercircle.getSimplifiedInsetFromClockwiseLoop( center, overhangInset ) if intercircle.isLargeSameDirection( outset, center, overhangInset ): belowOutsetLoops.append( outset ) bridgeRotation = complex() for loop in layerLoops: for pointIndex in xrange( len( loop ) ): previousIndex = ( pointIndex + len( loop ) - 1 ) % len( loop ) bridgeRotation += getOverhangDirection( belowOutsetLoops, loop[ previousIndex ], loop[ pointIndex ] ) if abs( bridgeRotation ) < 0.75 * layerThickness: return None else: bridgeRotation /= abs( bridgeRotation ) return cmath.sqrt( bridgeRotation )