Update lines.py

kyracho · web-flow · commit eaa8b633b4ab · 2024-08-27T14:23:17.000-07:00
diff --git a/lib/matplotlib/lines.py b/lib/matplotlib/lines.py
@@ -1499,6 +1499,9 @@ def get_transform(self):
         ax = self.axes
         points_transform = self._transform - ax.transData + ax.transScale
 
+        # Initialize the manual_slope variable to False
+        manual_slope = False
+
         if self._xy2 is not None:
             # two points were given
             (x1, y1), (x2, y2) = \
@@ -1517,15 +1520,13 @@ def get_transform(self):
             # one point and a slope were given
             x1, y1 = points_transform.transform(self._xy1)
             slope = self._slope
+            # Since the slope is provided manually, set manual_slope to True
+            manual_slope = True
         (vxlo, vylo), (vxhi, vyhi) = ax.transScale.transform(ax.viewLim)
 
-        # Adjust the tolerance for np.isclose based on the view limits
-        y_limits = ax.get_ylim()
-        tolerance = abs((y_limits[1] - y_limits[0]) / (vxhi - vxlo)) * 1e-8
-
         # General case: find intersections with view limits in either
         # direction, and draw between the middle two points.
-        if np.isclose(slope, 0, atol=tolerance):
+        if not manual_slope and (np.isclose(slope, 0, atol=1E-16)):
             start = vxlo, y1
             stop = vxhi, y1
         elif np.isinf(slope):
