diff --git a/lib/matplotlib/widgets.py b/lib/matplotlib/widgets.py
index 2579efc0e191..c9637bbc615d 100644
--- a/lib/matplotlib/widgets.py
+++ b/lib/matplotlib/widgets.py
@@ -20,6 +20,7 @@
from . import _api, backend_tools, cbook, colors, ticker
from .lines import Line2D
from .patches import Circle, Rectangle, Ellipse
+from .transforms import TransformedPatchPath
class LockDraw:
@@ -439,7 +440,10 @@ def __init__(self, ax, label, valmin, valmax, valinit=0.5, valfmt=None,
)
ax.add_patch(self.track)
self.poly = ax.axhspan(valmin, valinit, .25, .75, **kwargs)
- self.hline = ax.axhline(valinit, .15, .85, color=initcolor, lw=1)
+ # Drawing a longer line and clipping it to the track avoids
+ # pixellization-related asymmetries.
+ self.hline = ax.axhline(valinit, 0, 1, color=initcolor, lw=1,
+ clip_path=TransformedPatchPath(self.track))
handleXY = [[0.5], [valinit]]
else:
self.track = Rectangle(
@@ -449,12 +453,8 @@ def __init__(self, ax, label, valmin, valmax, valinit=0.5, valfmt=None,
)
ax.add_patch(self.track)
self.poly = ax.axvspan(valmin, valinit, .25, .75, **kwargs)
- # These asymmetric limits (.2, .9) minimize the asymmetry
- # above and below the *poly* when rendered to pixels.
- # This seems to be different for Horizontal and Vertical lines.
- # For discussion see:
- # https://github.com/matplotlib/matplotlib/pull/19265
- self.vline = ax.axvline(valinit, .2, .9, color=initcolor, lw=1)
+ self.vline = ax.axvline(valinit, 0, 1, color=initcolor, lw=1,
+ clip_path=TransformedPatchPath(self.track))
handleXY = [[valinit], [0.5]]
self._handle, = ax.plot(
*handleXY,
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