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from __future__ import print_function, division, absolute_import
import weakref
from copy import deepcopy
try:
from robofab.pens.pointPen import AbstractPointPen
from robofab.pens.adapterPens import PointToSegmentPen, SegmentToPointPen
from robofab.pens.boundsPen import BoundsPen
except:
from ufoLib.pointPen import (
AbstractPointPen, PointToSegmentPen, SegmentToPointPen)
from fontTools.pens.boundsPen import BoundsPen
from fontTools.pens.areaPen import AreaPen
from .booleanOperationManager import BooleanOperationManager
manager = BooleanOperationManager()
class BooleanGlyphDataPointPen(AbstractPointPen):
def __init__(self, glyph):
self._glyph = glyph
self._points = []
self.copyContourData = True
def _flushContour(self):
points = self._points
if len(points) == 1 and points[0][0] == "move":
# it's an anchor
segmentType, pt, smooth, name = points[0]
self._glyph.anchors.append((pt, name))
elif self.copyContourData:
# ignore double points on start and end
firstPoint = points[0]
if firstPoint[0] == "move":
# remove trailing off curves in an open path
while points[-1][0] is None:
points.pop()
lastPoint = points[-1]
if firstPoint[0] is not None and lastPoint[0] is not None:
if firstPoint[1] == lastPoint[1]:
if firstPoint[0] in ("line", "move"):
del points[0]
else:
raise AssertionError("Unhandled point type sequence")
elif firstPoint[0] == "move":
# auto close the path
_, pt, smooth, name = firstPoint
points[0] = "line", pt, smooth, name
contour = self._glyph.contourClass()
contour._points = points
self._glyph.contours.append(contour)
def beginPath(self):
self._points = []
def addPoint(self, pt, segmentType=None, smooth=False, name=None, **kwargs):
self._points.append((segmentType, pt, smooth, name))
def endPath(self):
self._flushContour()
def addComponent(self, baseGlyphName, transformation):
self._glyph.components.append((baseGlyphName, transformation))
class BooleanContour(object):
"""
Contour like object.
"""
def __init__(self):
self._points = []
self._clockwise = None
self._bounds = None
def __len__(self):
return len(self._points)
# shallow contour API
def draw(self, pen):
pointPen = PointToSegmentPen(pen)
self.drawPoints(pointPen)
def drawPoints(self, pointPen):
pointPen.beginPath()
for segmentType, pt, smooth, name in self._points:
pointPen.addPoint(pt=pt, segmentType=segmentType, smooth=smooth, name=name)
pointPen.endPath()
def _get_clockwise(self):
if self._clockwise is None:
pen = AreaPen()
pen.endPath = pen.closePath
self.draw(pen)
self._clockwise = pen.value < 0
return self._clockwise
clockwise = property(_get_clockwise)
def _get_bounds(self):
if self._bounds is None:
pen = BoundsPen(None)
self.draw(pen)
self._bounds = pen.bounds
return self._bounds
bounds = property(_get_bounds)
class BooleanGlyph(object):
"""
Glyph like object handling boolean operations.
union:
result = BooleanGlyph(glyph).union(BooleanGlyph(glyph2))
result = BooleanGlyph(glyph) | BooleanGlyph(glyph2)
difference:
result = BooleanGlyph(glyph).difference(BooleanGlyph(glyph2))
result = BooleanGlyph(glyph) % BooleanGlyph(glyph2)
intersection:
result = BooleanGlyph(glyph).intersection(BooleanGlyph(glyph2))
result = BooleanGlyph(glyph) & BooleanGlyph(glyph2)
xor:
result = BooleanGlyph(glyph).xor(BooleanGlyph(glyph2))
result = BooleanGlyph(glyph) ^ BooleanGlyph(glyph2)
"""
contourClass = BooleanContour
def __init__(self, glyph=None, copyContourData=True):
self.contours = []
self.components = []
self.anchors = []
self.name = None
self.unicodes = None
self.width = None
self.lib = {}
self.note = None
if glyph:
pen = self.getPointPen()
pen.copyContourData = copyContourData
glyph.drawPoints(pen)
self.name = glyph.name
self.unicodes = glyph.unicodes
self.width = glyph.width
self.lib = deepcopy(glyph.lib)
self.note = glyph.note
if not isinstance(glyph, self.__class__):
self.getSourceGlyph = weakref.ref(glyph)
def __repr__(self):
return "<BooleanGlyph %s>" % self.name
def __len__(self):
return len(self.contours)
def __getitem__(self, index):
return self.contours[index]
def getSourceGlyph(self):
return None
def getParent(self):
source = self.getSourceGlyph()
if source:
return source.getParent()
return None
# shalllow glyph API
def draw(self, pen):
pointPen = PointToSegmentPen(pen)
self.drawPoints(pointPen)
def drawPoints(self, pointPen):
for contour in self.contours:
contour.drawPoints(pointPen)
for baseName, transformation in self.components:
pointPen.addComponent(baseName, transformation)
for pt, name in self.anchors:
pointPen.beginPath()
pointPen.addPoint(pt=pt, segmentType="move", smooth=False, name=name)
pointPen.endPath()
def getPen(self):
return SegmentToPointPen(self.getPointPen())
def getPointPen(self):
return BooleanGlyphDataPointPen(self)
# boolean operations
def _booleanMath(self, operation, other):
if not isinstance(other, self.__class__):
other = self.__class__(other)
destination = self.__class__(self, copyContourData=False)
func = getattr(manager, operation)
if operation == "union":
contours = self.contours
if other is not None:
contours += other.contours
func(contours, destination.getPointPen())
else:
subjectContours = self.contours
clipContours = other.contours
func(subjectContours, clipContours, destination.getPointPen())
return destination
def __or__(self, other):
return self.union(other)
__ror__ = __ior__ = __or__
def __mod__(self, other):
return self.difference(other)
__rmod__ = __imod__ = __mod__
def __and__(self, other):
return self.intersection(other)
__rand__ = __iand__ = __and__
def __xor__(self, other):
return self.xor(other)
__rxor__ = __ixor__ = __xor__
def union(self, other):
return self._booleanMath("union", other)
def difference(self, other):
return self._booleanMath("difference", other)
def intersection(self, other):
return self._booleanMath("intersection", other)
def xor(self, other):
return self._booleanMath("xor", other)
def removeOverlap(self):
return self._booleanMath("union", None)
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