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Commit7dde595

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Get metrics for sub/superscript from actual font
...not just from the rcParam mathtext.fontset
1 parent4c98ef2 commit7dde595

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1 file changed

+127
-70
lines changed

1 file changed

+127
-70
lines changed

‎lib/matplotlib/mathtext.py

Lines changed: 127 additions & 70 deletions
Original file line numberDiff line numberDiff line change
@@ -1240,58 +1240,115 @@ def get_underline_thickness(self, font, fontsize, dpi):
12401240
# The number of different sizes of chars to use, beyond which they will not
12411241
# get any smaller
12421242
NUM_SIZE_LEVELS=6
1243-
# Percentage of x-height of additional horiz. space after sub/superscripts
1244-
SCRIPT_SPACE= {'cm':0.075,
1245-
'stix':0.10,
1246-
'stixsans':0.05,
1247-
'dejavuserif':0.05,
1248-
'dejavusans':0.05}
1249-
## Percentage of x-height that sub/superscripts drop below the baseline
1250-
SUBDROP= {'cm':0.2,
1251-
'stix':0.4,
1252-
'stixsans':0.4,
1253-
'dejavuserif':0.4,
1254-
'dejavusans':0.4}
1255-
# Percentage of x-height that superscripts are raised from the baseline
1256-
SUP1= {'cm':0.45,
1257-
'stix':0.8,
1258-
'stixsans':0.8,
1259-
'dejavuserif':0.7,
1260-
'dejavusans':0.7}
1261-
# Percentage of x-height that subscripts drop below the baseline
1262-
SUB1= {'cm':0.2,
1263-
'stix':0.3,
1264-
'stixsans':0.3,
1265-
'dejavuserif':0.3,
1266-
'dejavusans':0.3}
1267-
# Percentage of x-height that subscripts drop below the baseline when a
1268-
# superscript is present
1269-
SUB2= {'cm':0.3,
1270-
'stix':0.6,
1271-
'stixsans':0.5,
1272-
'dejavuserif':0.5,
1273-
'dejavusans':0.5}
1274-
# Percentage of x-height that sub/supercripts are offset relative to the
1275-
# nucleus edge for non-slanted nuclei
1276-
DELTA= {'cm':0.075,
1277-
'stix':0.05,
1278-
'stixsans':0.025,
1279-
'dejavuserif':0.025,
1280-
'dejavusans':0.025}
1281-
# Additional percentage of last character height above 2/3 of the x-height that
1282-
# supercripts are offset relative to the subscript for slanted nuclei
1283-
DELTASLANTED= {'cm':0.3,
1284-
'stix':0.3,
1285-
'stixsans':0.6,
1286-
'dejavuserif':0.2,
1287-
'dejavusans':0.2}
1288-
# Percentage of x-height that supercripts and subscripts are offset for
1289-
# integrals
1290-
DELTAINTEGRAL= {'cm':0.3,
1291-
'stix':0.3,
1292-
'stixsans':0.3,
1293-
'dejavuserif':0.1,
1294-
'dejavusans':0.1}
1243+
1244+
1245+
classFontConstantsBase(object):
1246+
"""
1247+
A set of constants that controls how certain things, such as sub-
1248+
and superscripts are laid out. These are all metrics that can't
1249+
be reliably retrieved from the font metrics in the font itself.
1250+
"""
1251+
# Percentage of x-height of additional horiz. space after sub/superscripts
1252+
script_space=0.05
1253+
1254+
# Percentage of x-height that sub/superscripts drop below the baseline
1255+
subdrop=0.4
1256+
1257+
# Percentage of x-height that superscripts are raised from the baseline
1258+
sup1=0.7
1259+
1260+
# Percentage of x-height that subscripts drop below the baseline
1261+
sub1=0.3
1262+
1263+
# Percentage of x-height that subscripts drop below the baseline when a
1264+
# superscript is present
1265+
sub2=0.5
1266+
1267+
# Percentage of x-height that sub/supercripts are offset relative to the
1268+
# nucleus edge for non-slanted nuclei
1269+
delta=0.025
1270+
1271+
# Additional percentage of last character height above 2/3 of the
1272+
# x-height that supercripts are offset relative to the subscript
1273+
# for slanted nuclei
1274+
delta_slanted=0.2
1275+
1276+
# Percentage of x-height that supercripts and subscripts are offset for
1277+
# integrals
1278+
delta_integral=0.1
1279+
1280+
1281+
classComputerModernFontConstants(FontConstantsBase):
1282+
script_space=0.075
1283+
subdrop=0.2
1284+
sup1=0.45
1285+
sub1=0.2
1286+
sub2=0.3
1287+
delta=0.075
1288+
delta_slanted=0.3
1289+
delta_integral=0.3
1290+
1291+
1292+
classSTIXFontConstants(FontConstantsBase):
1293+
script_space=0.1
1294+
sup1=0.8
1295+
sub2=0.6
1296+
delta=0.05
1297+
delta_slanted=0.3
1298+
delta_integral=0.3
1299+
1300+
1301+
classSTIXSansFontConstants(FontConstantsBase):
1302+
script_space=0.05
1303+
sup1=0.8
1304+
delta_slanted=0.6
1305+
delta_integral=0.3
1306+
1307+
1308+
classDejaVuSerifFontConstants(FontConstantsBase):
1309+
pass
1310+
1311+
1312+
classDejaVuSansFontConstants(FontConstantsBase):
1313+
pass
1314+
1315+
1316+
# Maps font family names to the FontConstantBase subclass to use
1317+
_font_constant_mapping= {
1318+
'DejaVu Sans':DejaVuSansFontConstants,
1319+
'DejaVu Sans Mono':DejaVuSansFontConstants,
1320+
'DejaVu Serif':DejaVuSerifFontConstants,
1321+
'cmb10':ComputerModernFontConstants,
1322+
'cmex10':ComputerModernFontConstants,
1323+
'cmmi10':ComputerModernFontConstants,
1324+
'cmr10':ComputerModernFontConstants,
1325+
'cmss10':ComputerModernFontConstants,
1326+
'cmsy10':ComputerModernFontConstants,
1327+
'cmtt10':ComputerModernFontConstants,
1328+
'STIXGeneral':STIXFontConstants,
1329+
'STIXNonUnicode':STIXFontConstants,
1330+
'STIXSizeFiveSym':STIXFontConstants,
1331+
'STIXSizeFourSym':STIXFontConstants,
1332+
'STIXSizeThreeSym':STIXFontConstants,
1333+
'STIXSizeTwoSym':STIXFontConstants,
1334+
'STIXSizeOneSym':STIXFontConstants,
1335+
# Map the fonts we used to ship, just for good measure
1336+
'Bitstream Vera Sans':DejaVuSansFontConstants,
1337+
'Bitstream Vera':DejaVuSansFontConstants,
1338+
}
1339+
1340+
1341+
def_get_font_constant_set(state):
1342+
constants=_font_constant_mapping.get(
1343+
state.font_output._get_font(state.font).family_name,
1344+
FontConstantsBase)
1345+
# STIX sans isn't really its own fonts, just different code points
1346+
# in the STIX fonts, so we have to detect this one separately.
1347+
if (constantsisSTIXFontConstantsand
1348+
isinstance(state.font_output,StixSansFonts)):
1349+
returnSTIXSansFontConstants
1350+
returnconstants
1351+
12951352

12961353
classMathTextWarning(Warning):
12971354
pass
@@ -2873,25 +2930,24 @@ def subsuper(self, s, loc, toks):
28732930
nucleus=Hlist([nucleus])
28742931

28752932
# Handle regular sub/superscripts
2876-
2877-
fs=rcParams['mathtext.fontset']
2878-
iffs=='custom':
2879-
fs='dejavusans'
2880-
2933+
constants=_get_font_constant_set(state)
28812934
lc_height=last_char.height
28822935
lc_baseline=0
28832936
ifself.is_dropsub(last_char):
28842937
lc_baseline=last_char.depth
28852938

28862939
# Compute kerning for sub and super
2887-
superkern=DELTA[fs]*xHeight
2888-
subkern=DELTA[fs]*xHeight
2940+
superkern=constants.delta*xHeight
2941+
subkern=constants.delta*xHeight
28892942
ifself.is_slanted(last_char):
2890-
superkern+=DELTA[fs]*xHeight
2891-
superkern+=DELTASLANTED[fs]* (lc_height-xHeight*2./3.)
2943+
superkern+=constants.delta*xHeight
2944+
superkern+= (constants.delta_slanted*
2945+
(lc_height-xHeight*2./3.))
28922946
ifself.is_dropsub(last_char):
2893-
subkern= (3*DELTA[fs]-DELTAINTEGRAL[fs])*lc_height
2894-
superkern= (3*DELTA[fs]+DELTAINTEGRAL[fs])*lc_height
2947+
subkern= (3*constants.delta-
2948+
constants.delta_integral)*lc_height
2949+
superkern= (3*constants.delta+
2950+
constants.delta_integral)*lc_height
28952951
else:
28962952
subkern=0
28972953

@@ -2900,26 +2956,26 @@ def subsuper(self, s, loc, toks):
29002956
x=Hlist([Kern(subkern),sub])
29012957
x.shrink()
29022958
ifself.is_dropsub(last_char):
2903-
shift_down=lc_baseline+SUBDROP[fs]*xHeight
2959+
shift_down=lc_baseline+constants.subdrop*xHeight
29042960
else:
2905-
shift_down=SUB1[fs]*xHeight
2961+
shift_down=constants.sub1*xHeight
29062962
x.shift_amount=shift_down
29072963
else:
29082964
x=Hlist([Kern(superkern),super])
29092965
x.shrink()
29102966
ifself.is_dropsub(last_char):
2911-
shift_up=lc_height-SUBDROP[fs]*xHeight
2967+
shift_up=lc_height-constants.subdrop*xHeight
29122968
else:
2913-
shift_up=SUP1[fs]*xHeight
2969+
shift_up=constants.sup1*xHeight
29142970
ifsubisNone:
29152971
x.shift_amount=-shift_up
29162972
else:# Both sub and superscript
29172973
y=Hlist([Kern(subkern),sub])
29182974
y.shrink()
29192975
ifself.is_dropsub(last_char):
2920-
shift_down=lc_baseline+SUBDROP[fs]*xHeight
2976+
shift_down=lc_baseline+constants.subdrop*xHeight
29212977
else:
2922-
shift_down=SUB2[fs]*xHeight
2978+
shift_down=constants.sub2*xHeight
29232979
# If sub and superscript collide, move super up
29242980
clr= (2.0*rule_thickness-
29252981
((shift_up-x.depth)- (y.height-shift_down)))
@@ -2931,8 +2987,9 @@ def subsuper(self, s, loc, toks):
29312987
x.shift_amount=shift_down
29322988

29332989
ifnotself.is_dropsub(last_char):
2934-
x.width+=SCRIPT_SPACE[fs]*xHeight
2990+
x.width+=constants.script_space*xHeight
29352991
result=Hlist([nucleus,x])
2992+
29362993
return [result]
29372994

29382995
def_genfrac(self,ldelim,rdelim,rule,style,num,den):

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