Update app.py

app.py

@@ -61,10 +61,10 @@ def plot_ui():
 def plot_server(input, output, session, r, v, colours):
     opacity = reactive.value(0.5)
 
-    @reactive.effect
-    @reactive.event(input.opacity_slider)
-    def _():
-        opacity.set(input.opacity_slider())
+    # @reactive.effect
+    # @reactive.event(input.opacity_slider)
+    # def _():
+    #     opacity.set(input.opacity_slider())
     
     @render.plot
     def plot_prediction():
@@ -72,15 +72,15 @@ def plot_server(input, output, session, r, v, colours):
 
         out = v.overlay_instances(masks = r["instances"].pred_masks.to("cpu"),
                                   assigned_colors = colours, 
-                                  alpha = opacity())
+                                  alpha = input.opacity_slider())
 
         # ax = plt.Axes(fig, [0., 0., 1., 1.])
         ax.set_axis_off()
         # fig.add_axes(ax)
 
         ax.imshow(cv2.cvtColor(out.get_image()[:, :, ::-1], cv2.COLOR_BGR2RGB))
-        # fig.canvas.draw()
-        # fig.canvas.flush_events()
+        fig.canvas.draw()
+        fig.canvas.flush_events()
 
 def server(input, output, session: Session):
     analysis_results = reactive.Value([])