Move axis height determination to Fonts classes

QuLogic · QuLogic · commit df479e9613fc · 2026-02-03T05:21:15.000-05:00
diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
@@ -306,6 +306,12 @@ def render_rect_filled(self, output: Output,
         """
         output.rects.append((x, y, w, h))
 
+    def get_axis_height(self, font: str, fontsize: float, dpi: float) -> float:
+        """
+        Get the axis height for the given *font* and *fontsize*.
+        """
+        raise NotImplementedError()
+
     def get_xheight(self, font: str, fontsize: float, dpi: float) -> float:
         """
         Get the xheight for the given *font* and *fontsize*.
@@ -407,6 +413,13 @@ def _get_info(self, fontname: str, font_class: str, sym: str, fontsize: float,
             offset=offset
         )
 
+    def get_axis_height(self, fontname: str, fontsize: float, dpi: float) -> float:
+        # The fraction line (if present) must be aligned with the minus sign. Therefore,
+        # the height of the latter from the baseline is the axis height.
+        metrics = self.get_metrics(
+            fontname, mpl.rcParams['mathtext.default'], '\u2212', fontsize, dpi)
+        return (metrics.ymax + metrics.ymin) / 2
+
     def get_xheight(self, fontname: str, fontsize: float, dpi: float) -> float:
         # Some fonts report the wrong x-height, while some don't store it, so
         # we do a poor man's x-height.
@@ -2659,12 +2672,8 @@ def _genfrac(self, ldelim: str, rdelim: str, rule: float | None, style: _MathSty
         state = self.get_state()
         thickness = state.get_current_underline_thickness()
 
-        # The fraction line (if present) must be aligned with the minus sign. Therefore,
-        # the height of the latter from the baseline is the axis height.
-        metrics = state.fontset.get_metrics(
-            state.font, mpl.rcParams['mathtext.default'],
-            '\u2212', state.fontsize, state.dpi)
-        axis_height = (metrics.ymax + metrics.ymin) / 2
+        axis_height = state.fontset.get_axis_height(
+            state.font, state.fontsize, state.dpi)
         consts = _get_font_constant_set(state)
         x_height = state.fontset.get_xheight(state.font, state.fontsize, state.dpi)
 
