Merge pull request matplotlib#25106 from anntzer/cd

Fix cursor_demo wrt. Line2D.set_x/ydata not accepting scalars anymore.

Author: story645

examples/event_handling/cursor_demo.py

@@ -56,8 +56,8 @@ def on_mouse_move(self, event):
             self.set_cross_hair_visible(True)
             x, y = event.xdata, event.ydata
             # update the line positions
-            self.horizontal_line.set_ydata(y)
-            self.vertical_line.set_xdata(x)
+            self.horizontal_line.set_ydata([y])
+            self.vertical_line.set_xdata([x])
             self.text.set_text(f'x={x:1.2f}, y={y:1.2f}')
             self.ax.figure.canvas.draw()
 
@@ -132,8 +132,8 @@ def on_mouse_move(self, event):
             self.set_cross_hair_visible(True)
             # update the line positions
             x, y = event.xdata, event.ydata
-            self.horizontal_line.set_ydata(y)
-            self.vertical_line.set_xdata(x)
+            self.horizontal_line.set_ydata([y])
+            self.vertical_line.set_xdata([x])
             self.text.set_text(f'x={x:1.2f}, y={y:1.2f}')
 
             self.ax.figure.canvas.restore_region(self.background)
@@ -204,8 +204,8 @@ def on_mouse_move(self, event):
             x = self.x[index]
             y = self.y[index]
             # update the line positions
-            self.horizontal_line.set_ydata(y)
-            self.vertical_line.set_xdata(x)
+            self.horizontal_line.set_ydata([y])
+            self.vertical_line.set_xdata([x])
             self.text.set_text(f'x={x:1.2f}, y={y:1.2f}')
             self.ax.figure.canvas.draw()