def getBeamStemCounters(self, y=None):
u"""Calculate the stems and counters by a horizontal beam through the middle of the bounding box.
This works best with the capital I. The value is uncached and should only be used if
normal stem detection fails. Or in case of italic."""
beamStems = {}
beamCounters = {}
if y is None:
y = (self.maxY - self.minY) / 2
line = ((-sys.maxsize, y), (sys.maxsize, y))
# Get intersections with this line. We can assume they are sorted set by x value
intersections = self.intersectWithLine(line)
# If could not make path or flattened path or no intersections or just one, give up.
if intersections is None or len(intersections) < 2:
return None
# Now make Stem instance from these values, as if they we Verticals positions.
# The difference is that we only have points, not point contexts here,
# but for limited use that should not make a difference for entry in a Stem
p0 = ap0 = None
for n in range(0, len(intersections)):
# Add this stem or counter to the result. Create point contexts, simulating vertical
# We cannot just check on odd/even, as a line may pass exactly on the top/bottom of a curve.
p = intersections[n]
pUp = p[0], p[1] + 10
pDown = p[0], p[1] - 10
ap = APointContext((pUp, pUp, pUp, p, pDown, pDown,
pDown)) # Simulate vertical context.
if p0 is None:
p0 = p
ap0 = ap
continue
p1 = p0
ap1 = ap0
p0 = p
ap0 = ap
# If middle of the point is on black, then it is a stem. Otherwise it is a counter.
mp = (p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2
if self.onBlack(mp):
stem = self.STEM_CLASS(ap1, ap0, self.glyph.name)
size = asInt(stem.size) # Make sure not to get floats as key
if not size in beamStems:
beamStems[size] = []
beamStems[size].append(stem)
else: # Otherwise, middle point between intersections is on white, it must be a counter
counter = self.COUNTER_CLASS(ap1, ap0, self.glyph.name)
size = asInt(counter.size) # Make sure to get floats as key
if not size in beamCounters:
beamCounters[size] = []
beamCounters[size].append(counter)
return beamStems, beamCounters
def findBars(self):
"""The @findBars@ method finds the bars in the current glyph and
assigns them as dictionary to @self._bars@. Since we cannot use the CVT
of the glyph (the analyzer is user to find these values, not to use
them), we'll make an assumption about the pattern of vertices found. It
is up to the calling function to make sure that the current glyph is
relevant in the kind of vertices that we are looking for."""
horizontals = self.horizontals
self._bars = bars = {}
# BlueBars by separate property call
self._roundBars = roundBars = {}
self._straightRoundBars = straightRoundBars = {}
self._verticalCounters = verticalCounters = {}
self._verticalRoundCounters = verticalRoundCounters = {}
self._verticalMixedCounters = verticalMixedCounters = {}
self._allVerticalCounters = allVerticalCounters = {} # Space between all neighboring stems, running over white only.
checked = set() # Store what we checked, to avoid doubles in the loops
dimensions = self.dimensions
if dimensions:
for dimension in dimensions: # UFO only, needs to be written.
if self.FLOQMEME_BAR in dimensions['types']: # Is this this dimension defining a stem?
vbar = self.BAR_CLASS(dimensions['pc0'], dimensions['pc1'], self.glyph.name)
size = vbar.size
if not size in bars:
bars[size] = []
bars[size].append(vbar)
if not bars: # No "manual" hints defined, try to analyze from the found Vertical instances.
for _, horizontal1 in sorted(horizontals.items()): # y1, horizontal1
for _, horizontal2 in sorted(horizontals.items()): # y2, horizontal2
if horizontal1 is horizontal2:
continue
# We need to loop through the points of the horizontal
# separate, to find e.g. the vertical separate round bars
# of the points of a ellipsis. Otherwise they will seen as one horizontal.
for pc0 in horizontal1:
for pc1 in horizontal2:
# Skip if identical, they cannot be a stem.
if pc0 is pc1:
continue
# Skip if we already examined this one.
if (pc0.index, pc1.index) in checked:
continue
checked.add((pc0.index, pc1.index))
checked.add((pc1.index, pc0.index))
# Test if the y values are in range so this can be seen as stem pair
# and test if this pair is spanning a black space and not covered in black.
if self.isBar(pc0, pc1):
# Add this bar to the result.
hbar = self.BAR_CLASS(pc0, pc1, self.glyph.name)
size = asInt(hbar.size) # Make sure not to get floats as keys
if not size in bars:
bars[size] = []
bars[size].append(hbar)
elif self.isRoundBar(pc0, pc1):
# If either of the point context is a curve extreme
# then count this bar as round bar
rbar = self.BAR_CLASS(pc0, pc1, self.glyph.name)
size = asInt(rbar.size) # Make sure not to get floats as keys
if not size in roundBars:
roundBars[size] = []
roundBars[size].append(rbar)
elif self.isStraightRoundBar(pc0, pc1):
# If one side is straight and the other side is
# round extreme then count this stem as
# straight round bar.
srbar = self.BAR_CLASS(pc0, pc1, self.glyph.name)
size = asInt(srbar.size) # Make sure not to get floats as key
if not size in straightRoundBars:
straightRoundBars[size] = []
straightRoundBars[size].append(srbar)
elif self.isVerticalCounter(pc0, pc1):
# If there is just white space between the
# points and they are some kind of extreme,
# then assume this is a counter.
counter = self.VERTICAL_COUNTER_CLASS(pc0, pc1, self.glyph.name)
size = asInt(counter.size)
if pc0.isHorizontalExtreme() and pc1.isHorizontalExtreme():
if not size in verticalCounters:
verticalCounters[size] = []
verticalCounters[size].append(counter)
elif pc0.isHorizontalRoundExtreme() and pc1.isHorizontalRoundExtreme():
if not size in verticalRoundCounters:
verticalRoundCounters[size] = []
verticalRoundCounters[size].append(counter)
else:
if not size in verticalMixedCounters:
verticalMixedCounters[size] = []
verticalMixedCounters[size].append(counter)
if not size in allVerticalCounters:
allVerticalCounters[size] = []
allVerticalCounters[size].append(counter)
return self._bars
def findStems(self):
"""The @findStems@ method finds the stems in the current glyph and
assigns them as dictionary to @self._stems@. Since we cannot use the
CVT of the glyph (the analyzer is used to find these values, not to use
them), we'll make an assumption about the pattern of vertices found. It
is up to the calling function to make sure that the current glyph is
relevant in the kind of vertices that we are looking for.
NOTE: An alternative approach could be to make a Fourier analysis of all
stem distances of the font, and so find out which are likely to have a
stem distance.
Additionally the stems are found by manual hints in the glyph, as
generated by the Hint Editor. Since these stem definitions not
necessarily run from point to point (instead an interpolated location
on a curve or straight line can be used), a special kind of
PointContext is added there.
"""
self._stems = stems = {}
self._roundStems = roundStems = {}
self._straightRoundStems = straightRoundStems = {}
# Space between all neighboring stems, running over white only.
self._allHorizontalCounters = horizontalCounters = {}
verticals = self.verticals
# Store what we checked, to avoid doubles in the loops.
checked = set()
for _, vertical1 in sorted(verticals.items()): # x1, vertical1
for _, vertical2 in sorted(verticals.items()): # x2, vertical2
if vertical1 is vertical2:
continue
# We need to loop through the points of the vertical
# separate, to find e.g. the horizontal separate round stems
# of the points of a column. Otherwise they will be seen as one vertical.
for pc0 in vertical1:
for pc1 in vertical2:
# Skip if identical, they cannot be a stem.
if pc0 is pc1:
continue
# Skip if we already examined this one.
if (pc0.index, pc1.index) in checked:
continue
checked.add((pc0.index, pc1.index))
checked.add((pc1.index, pc0.index))
# Test if the y values are in range so this can be seen as stem pair
# and test if this pair is spanning a black space and the lines are
# not entirely covered in black.
if self.isStem(pc0, pc1):
# Add this stem to the result.
stem = self.STEM_CLASS(pc0, pc1, self.glyph.name)
size = asInt(stem.size) # Make sure not to get floats as key
if not size in stems:
stems[size] = []
stems[size].append(stem)
elif self.isRoundStem(pc0, pc1):
# If either of the point context is a curve extreme
# then count this stem as round stem
stem = self.STEM_CLASS(pc0, pc1, self.glyph.name)
size = asInt(stem.size) # Make sure not to get floats as key
if not size in roundStems:
roundStems[size] = []
roundStems[size].append(stem)
elif self.isStraightRoundStem(pc0, pc1):
# If one side is straight and the other side is round extreme
# then count this stem as straight round stem.
stem = self.STEM_CLASS(pc0, pc1, self.glyph.name)
size = asInt(stem.size) # Make sure not to get floats as key
if not size in straightRoundStems:
straightRoundStems[size] = []
straightRoundStems[size].append(stem)
elif self.isHorizontalCounter(pc0, pc1):
# If there is just whitspace between the points and they are some kind of extreme,
# then assume this is a counter.
counter = self.COUNTER_CLASS(pc0, pc1, self.glyph.name)
size = asInt(counter.size)
if not size in horizontalCounters:
horizontalCounters[size] = []
horizontalCounters[size].append(counter)
return self._stems