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Commitb15a1c1

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Make mathtext's fraction alignment resemble LaTeX's
1 parent756d1d4 commitb15a1c1

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302 files changed

+21007
-19078
lines changed

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302 files changed

+21007
-19078
lines changed

‎lib/matplotlib/_mathtext.py

Lines changed: 26 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -2759,6 +2759,9 @@ def subsuper(self, s, loc, toks):
27592759

27602760
def_genfrac(self,ldelim,rdelim,rule,style,num,den):
27612761
state=self.get_state()
2762+
cap_height=state.font_output.get_metrics(
2763+
state.font,mpl.rcParams['mathtext.default'],
2764+
'H',state.fontsize,state.dpi).height
27622765
thickness=state.font_output.get_underline_thickness(
27632766
state.font,state.fontsize,state.dpi)
27642767

@@ -2767,26 +2770,38 @@ def _genfrac(self, ldelim, rdelim, rule, style, num, den):
27672770
ifstyleisnotself._MathStyle.DISPLAYSTYLE:
27682771
num.shrink()
27692772
den.shrink()
2773+
min_clearance=np.ceil(0.5*thickness)
2774+
cap_height*=0.7
2775+
else:
2776+
min_clearance=1.5*thickness
27702777
cnum=HCentered([num])
27712778
cden=HCentered([den])
27722779
width=max(num.width,den.width)
27732780
cnum.hpack(width,'exactly')
27742781
cden.hpack(width,'exactly')
2775-
vlist=Vlist([cnum,# numerator
2776-
Vbox(0,thickness*2.0),# space
2777-
Hrule(state,rule),# rule
2778-
Vbox(0,thickness*2.0),# space
2779-
cden# denominator
2780-
])
2782+
2783+
numerator_padding=max(
2784+
3/5*cap_height-cnum.depth,min_clearance)-thickness
2785+
denominator_padding=max(
2786+
4/3*cap_height-cden.height,min_clearance)+thickness
2787+
vlist_builder= []
2788+
ifcnum.height<cap_height:
2789+
vlist_builder.append(Vbox(0,cap_height-cnum.height))
2790+
vlist_builder+= [cnum,# numerator
2791+
Vbox(0,numerator_padding),# space
2792+
Hrule(state,rule),# rule
2793+
Vbox(0,denominator_padding),# space
2794+
cden# denominator
2795+
]
2796+
vlist=Vlist(vlist_builder)
27812797

27822798
# Shift so the fraction line sits in the middle of the
2783-
#equals sign
2799+
#minus sign
27842800
metrics=state.font_output.get_metrics(
27852801
state.font,mpl.rcParams['mathtext.default'],
2786-
'=',state.fontsize,state.dpi)
2787-
shift= (cden.height-
2788-
((metrics.ymax+metrics.ymin)/2-
2789-
thickness*3.0))
2802+
'\u2212',state.fontsize,state.dpi)
2803+
shift= (denominator_padding+cden.height-
2804+
(metrics.ymax+metrics.ymin)/2-rule/2)
27902805
vlist.shift_amount=shift
27912806

27922807
result= [Hlist([vlist,Hbox(thickness*2.)])]
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