Fix glyph sizing in textpath.

anntzer · anntzer · commit 576cd649be5e · 2019-05-07T22:48:11.000+02:00
Scaling by dvifont.size / self.FONT_SCALE resulted in way to small
glyphs for many fonts.
diff --git a/lib/matplotlib/tests/baseline_images/test_backend_svg/unicode_usetex.svg b/lib/matplotlib/tests/baseline_images/test_backend_svg/unicode_usetex.svg
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+  "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Created with matplotlib (https://matplotlib.org/) -->
+<svg height="345.6pt" version="1.1" viewBox="0 0 460.8 345.6" width="460.8pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+ <defs>
+  <style type="text/css">
+*{stroke-linecap:butt;stroke-linejoin:round;white-space:pre;}
+  </style>
+ </defs>
+ <g id="figure_1">
+  <g id="patch_1">
+   <path d="M 0 345.6 
+L 460.8 345.6 
+L 460.8 0 
+L 0 0 
+z
+" style="fill:#ffffff;"/>
+  </g>
+  <g id="text_1">
+   <!-- \textdegree -->
+   <defs>
+    <path d="M 13.90625 68 
+C 8.5 67.296875 5.09375 62.75 5.09375 58 
+C 5.09375 52.953125 9 48 15 48 
+L 15.90625 48 
+C 21.203125 48.703125 24.796875 53.25 24.796875 58 
+C 24.796875 63.15625 20.5 68 14.796875 68 
+z
+M 8.203125 57.390625 
+L 8.203125 58 
+C 8.203125 61.546875 11.296875 64.671875 14.796875 64.671875 
+C 18.40625 64.671875 20.90625 61.875 21.59375 58.609375 
+L 21.59375 57.984375 
+C 21.59375 54.40625 18.5 51.21875 15 51.21875 
+C 11.40625 51.21875 8.90625 54.0625 8.203125 57.390625 
+z
+" id="Computer_Modern_Sans_Serif-176"/>
+   </defs>
+   <g transform="translate(230.4 172.8)scale(0.1 -0.1)">
+    <use xlink:href="#Computer_Modern_Sans_Serif-176"/>
+   </g>
+  </g>
+ </g>
+</svg>
diff --git a/lib/matplotlib/tests/test_backend_svg.py b/lib/matplotlib/tests/test_backend_svg.py
@@ -182,20 +182,12 @@ def psfont(*args, **kwargs):
         fig.savefig(tmpfile, format='svg')
 
 
-# Use Computer Modern Sans Serif, not Helvetica (which has no \textwon).
-@pytest.mark.style('default')
 @needs_usetex
-def test_unicode_won():
-    fig = Figure()
-    fig.text(.5, .5, r'\textwon', usetex=True)
-
-    with BytesIO() as fd:
-        fig.savefig(fd, format='svg')
-        buf = fd.getvalue().decode('ascii')
-
-    won_id = 'Computer_Modern_Sans_Serif-142'
-    assert re.search(r'<path d=(.|\s)*?id="{0}"/>'.format(won_id), buf)
-    assert re.search(r'<use[^/>]*? xlink:href="#{0}"/>'.format(won_id), buf)
+@image_comparison(baseline_images=['unicode_usetex'], extensions=['svg'])
+def test_unicode_usetex():
+    mpl.rcParams['svg.fonttype'] = 'none'
+    mpl.style.use('default')
+    plt.figtext(.5, .5, r'\textdegree', usetex=True)
 
 
 def test_svgnone_with_data_coordinates():
diff --git a/lib/matplotlib/textpath.py b/lib/matplotlib/textpath.py
@@ -321,7 +321,7 @@ def get_glyphs_tex(self, prop, s, glyph_map=None,
             glyph_ids.append(char_id)
             xpositions.append(x1)
             ypositions.append(y1)
-            sizes.append(dvifont.size / self.FONT_SCALE)
+            sizes.append(1)
 
         myrects = []
 
