DOC: show off more keyword arguments in span selector demo

tacaswell · tacaswell · commit 472072b8efcb · 2021-06-17T20:55:09.000-04:00
diff --git a/examples/widgets/span_selector.py b/examples/widgets/span_selector.py
@@ -16,14 +16,14 @@
 fig, (ax1, ax2) = plt.subplots(2, figsize=(8, 6))
 
 x = np.arange(0.0, 5.0, 0.01)
-y = np.sin(2*np.pi*x) + 0.5*np.random.randn(len(x))
+y = np.sin(2 * np.pi * x) + 0.5 * np.random.randn(len(x))
 
 ax1.plot(x, y)
 ax1.set_ylim(-2, 2)
 ax1.set_title('Press left mouse button and drag '
               'to select a region in the top graph')
 
-line2, = ax2.plot([], [])
+(line2,) = ax2.plot([], [])
 
 
 def onselect(xmin, xmax):
@@ -37,7 +37,8 @@ def onselect(xmin, xmax):
         line2.set_data(region_x, region_y)
         ax2.set_xlim(region_x[0], region_x[-1])
         ax2.set_ylim(region_y.min(), region_y.max())
-        fig.canvas.draw()
+        fig.canvas.draw_idle()
+
 
 #############################################################################
 # .. note::
@@ -47,8 +48,15 @@ def onselect(xmin, xmax):
 #
 
 
-span = SpanSelector(ax1, onselect, 'horizontal', useblit=True,
-                    rectprops=dict(alpha=0.5, facecolor='tab:blue'))
+span = SpanSelector(
+    ax1,
+    onselect,
+    "horizontal",
+    useblit=True,
+    rectprops=dict(alpha=0.5, facecolor="tab:blue"),
+    interactive=True,
+    drag_from_anywhere=True
+)
 # Set useblit=True on most backends for enhanced performance.
 
 
