Move StatisticsPen into fontTools.pens.statisticsPen

Lib/fontTools/pens/statisticsPen.py

@@ -0,0 +1,79 @@
+from __future__ import print_function, division, absolute_import
+from fontTools.misc.py23 import *
+import math
+from fontTools.pens.momentsPen import MomentsPen
+
+class StatisticsPen(MomentsPen):
+
+	# Center of mass
+	# https://en.wikipedia.org/wiki/Center_of_mass#A_continuous_volume
+	@property
+	def meanX(self):
+		return self.momentX / self.area if self.area else 0
+	@property
+	def meanY(self):
+		return self.momentY / self.area if self.area else 0
+
+	#  Var(X) = E[X^2] - E[X]^2
+	@property
+	def varianceX(self):
+		return self.momentXX / self.area - self.meanX**2 if self.area else 0
+	@property
+	def varianceY(self):
+		return self.momentYY / self.area - self.meanY**2 if self.area else 0
+
+	@property
+	def stddevX(self):
+		return math.copysign(abs(self.varianceX)**.5, self.varianceX)
+	@property
+	def stddevY(self):
+		return math.copysign(abs(self.varianceY)**.5, self.varianceY)
+
+	#  Covariance(X,Y) = ( E[X.Y] - E[X]E[Y] )
+	@property
+	def covariance(self):
+		return self.momentXY / self.area - self.meanX*self.meanY if self.area else 0
+
+	#  Correlation(X,Y) = Covariance(X,Y) / ( stddev(X) * stddev(Y) )
+	# https://en.wikipedia.org/wiki/Pearson_product-moment_correlation_coefficient
+	@property
+	def correlation(self):
+		correlation = self.covariance / (self.stddevX * self.stddevY) if self.area else 0
+		return correlation if abs(correlation) > 1e-3 else 0
+
+	@property
+	def slant(self):
+		slant = self.covariance / self.varianceY if self.area else 0
+		return slant if abs(slant) > 1e-3 else 0
+
+
+def _test(glyphset, upem, glyphs):
+	from fontTools.pens.transformPen import TransformPen
+	from fontTools.misc.transform import Scale
+
+	print('upem', upem)
+
+	for glyph_name in glyphs:
+		print()
+		print("glyph:", glyph_name)
+		glyph = glyphset[glyph_name]
+		pen = StatisticsPen(glyphset=glyphset)
+		transformer = TransformPen(pen, Scale(1./upem))
+		glyph.draw(transformer)
+		for item in ['area', 'momentX', 'momentY', 'momentXX', 'momentYY', 'momentXY', 'meanX', 'meanY', 'varianceX', 'varianceY', 'stddevX', 'stddevY', 'covariance', 'correlation', 'slant']:
+			if item[0] == '_': continue
+			print ("%s: %g" % (item, getattr(pen, item)))
+
+def main(args):
+	if not args:
+		return
+	filename, glyphs = args[0], args[1:]
+	if not glyphs:
+		glyphs = ['e', 'o', 'I', 'slash', 'E', 'zero', 'eight', 'minus', 'equal']
+	from fontTools.ttLib import TTFont
+	font = TTFont(filename)
+	_test(font.getGlyphSet(), font['head'].unitsPerEm, glyphs)
+
+if __name__ == '__main__':
+	import sys
+	main(sys.argv[1:])

Snippets/interpolatable.py

@@ -9,7 +9,7 @@ from __future__ import print_function, division, absolute_import
 from fontTools.misc.py23 import *
 
 from fontTools.pens.basePen import BasePen
-from symfont import StatisticsPen
+from fontTools.pens.statisticsPen import StatisticsPen
 import itertools
 
 class PerContourOrComponentPen(BasePen):

Snippets/symfont.py

@@ -12,11 +12,7 @@ from fontTools.misc.py23 import *
 
 import sympy as sp
 import sys
-import math
 from fontTools.pens.basePen import BasePen
-from fontTools.pens.transformPen import TransformPen
-from fontTools.pens.momentsPen import MomentsPen
-from fontTools.misc.transform import Scale
 from functools import partial
 from itertools import count
 
@@ -188,79 +184,3 @@ MomentXYPen = partial(GreenPen, func=x*y)
 
 
 
-#
-# Glyph statistics object
-#
-
-class StatisticsPen(MomentsPen):
-
-	# Center of mass
-	# https://en.wikipedia.org/wiki/Center_of_mass#A_continuous_volume
-	@property
-	def meanX(self):
-		return self.momentX / self.area if self.area else 0
-	@property
-	def meanY(self):
-		return self.momentY / self.area if self.area else 0
-
-	#  Var(X) = E[X^2] - E[X]^2
-	@property
-	def varianceX(self):
-		return self.momentXX / self.area - self.meanX**2 if self.area else 0
-	@property
-	def varianceY(self):
-		return self.momentYY / self.area - self.meanY**2 if self.area else 0
-
-	@property
-	def stddevX(self):
-		return math.copysign(abs(self.varianceX)**.5, self.varianceX)
-	@property
-	def stddevY(self):
-		return math.copysign(abs(self.varianceY)**.5, self.varianceY)
-
-	#  Covariance(X,Y) = ( E[X.Y] - E[X]E[Y] )
-	@property
-	def covariance(self):
-		return self.momentXY / self.area - self.meanX*self.meanY if self.area else 0
-
-	#  Correlation(X,Y) = Covariance(X,Y) / ( stddev(X) * stddev(Y) )
-	# https://en.wikipedia.org/wiki/Pearson_product-moment_correlation_coefficient
-	@property
-	def correlation(self):
-		correlation = self.covariance / (self.stddevX * self.stddevY) if self.area else 0
-		return correlation if abs(correlation) > 1e-3 else 0
-
-	@property
-	def slant(self):
-		slant = self.covariance / self.varianceY if self.area else 0
-		return slant if abs(slant) > 1e-3 else 0
-
-
-def test(glyphset, upem, glyphs):
-	print('upem', upem)
-
-	for glyph_name in glyphs:
-		print()
-		print("glyph:", glyph_name)
-		glyph = glyphset[glyph_name]
-		pen = StatisticsPen(glyphset=glyphset)
-		transformer = TransformPen(pen, Scale(1./upem))
-		glyph.draw(transformer)
-		for item in ['area', 'momentX', 'momentY', 'momentXX', 'momentYY', 'momentXY', 'meanX', 'meanY', 'varianceX', 'varianceY', 'stddevX', 'stddevY', 'covariance', 'correlation', 'slant']:
-			if item[0] == '_': continue
-			print ("%s: %g" % (item, getattr(pen, item)))
-
-
-def main(args):
-	if not args:
-		return
-	filename, glyphs = args[0], args[1:]
-	if not glyphs:
-		glyphs = ['e', 'o', 'I', 'slash', 'E', 'zero', 'eight', 'minus', 'equal']
-	from fontTools.ttLib import TTFont
-	font = TTFont(filename)
-	test(font.getGlyphSet(), font['head'].unitsPerEm, glyphs)
-
-if __name__ == '__main__':
-	import sys
-	main(sys.argv[1:])