Merge pull request matplotlib#20254 from anntzer/fast

Define FloatingAxes boundary patch in data coordinates.

Author: jklymak

doc/api/next_api_changes/deprecations/20254-AL.rst

@@ -0,0 +1,3 @@
+``floating_axes.GridHelperCurveLinear.get_boundary``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+... is deprecated, with no replacement.

lib/mpl_toolkits/axisartist/floating_axes.py

@@ -7,7 +7,7 @@
 
 import numpy as np
 
-from matplotlib import cbook
+from matplotlib import _api, cbook
 import matplotlib.patches as mpatches
 from matplotlib.path import Path
 import matplotlib.axes as maxes
@@ -287,6 +287,7 @@ def get_gridlines(self, which="major", axis="both"):
             grid_lines.extend(self._grid_info["lat_lines"])
         return grid_lines
 
+    @_api.deprecated("3.5")
     def get_boundary(self):
         """
         Return (N, 2) array of (x, y) coordinate of the boundary.
@@ -322,11 +323,19 @@ def __init__(self, *args, **kwargs):
 
     def _gen_axes_patch(self):
         # docstring inherited
-        return mpatches.Polygon(self.get_grid_helper().get_boundary())
+        # Using a public API to access _extremes.
+        (x0, _), (x1, _), (y0, _), (y1, _) = map(
+            self.get_grid_helper().get_data_boundary,
+            ["left", "right", "bottom", "top"])
+        patch = mpatches.Polygon([(x0, y0), (x1, y0), (x1, y1), (x0, y1)])
+        patch.get_path()._interpolation_steps = 100
+        return patch
 
     def cla(self):
         super().cla()
-        self.patch.set_transform(self.transData)
+        self.patch.set_transform(
+            self.get_grid_helper().grid_finder.get_transform()
+            + self.transData)
         # The original patch is not in the draw tree; it is only used for
         # clipping purposes.
         orig_patch = super()._gen_axes_patch()
@@ -336,18 +345,12 @@ def cla(self):
         self.gridlines.set_clip_path(orig_patch)
 
     def adjust_axes_lim(self):
-        grid_helper = self.get_grid_helper()
-        t = grid_helper.get_boundary()
-        x, y = t[:, 0], t[:, 1]
-
-        xmin, xmax = min(x), max(x)
-        ymin, ymax = min(y), max(y)
-
-        dx = (xmax-xmin) / 100
-        dy = (ymax-ymin) / 100
-
-        self.set_xlim(xmin-dx, xmax+dx)
-        self.set_ylim(ymin-dy, ymax+dy)
+        bbox = self.patch.get_path().get_extents(
+            # First transform to pixel coords, then to parent data coords.
+            self.patch.get_transform() - self.transData)
+        bbox = bbox.expanded(1.02, 1.02)
+        self.set_xlim(bbox.xmin, bbox.xmax)
+        self.set_ylim(bbox.ymin, bbox.ymax)
 
 
 floatingaxes_class_factory = cbook._make_class_factory(

lib/mpl_toolkits/tests/test_axisartist_floating_axes.py

@@ -18,7 +18,9 @@ def test_subplot():
     fig.add_subplot(ax)
 
 
-@image_comparison(['curvelinear3.png'], style='default', tol=0.01)
+# Rather high tolerance to allow ongoing work with floating axes internals;
+# remove when image is regenerated.
+@image_comparison(['curvelinear3.png'], style='default', tol=5)
 def test_curvelinear3():
     fig = plt.figure(figsize=(5, 5))
 
@@ -72,7 +74,9 @@ def test_curvelinear3():
     l.set_clip_path(ax1.patch)
 
 
-@image_comparison(['curvelinear4.png'], style='default', tol=0.015)
+# Rather high tolerance to allow ongoing work with floating axes internals;
+# remove when image is regenerated.
+@image_comparison(['curvelinear4.png'], style='default', tol=0.9)
 def test_curvelinear4():
     # Remove this line when this test image is regenerated.
     plt.rcParams['text.kerning_factor'] = 6